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| 1. general description the pca9952 and PCA9955 are i 2 c-bus controlled 16-channel constant current led driver optimized for dimming and blinking 57 ma red/green/blue/amber (rgba) leds in amusement products. each ledn output has it s own 8-bit resolution (256 steps) fixed frequency individual pwm controller that operat es at 31.25 khz with a duty cycle that is adjustable from 0 % to 99.6 % to allow the led to be set to a specific brightness value. an additional 8-bit resolution (256 steps) group pwm controller has both a fixed frequency of 122 hz and an adjustable frequency between 15 hz to once every 16.8 seconds with a duty cycle that is adjustable from 0 % to 99.6 % that is used to either dim or blink all leds with the same value. each ledn output can be off, on (no pwm co ntrol), set at its individual pwm controller value or at both individual and group pw m controller values. the pca9952 and PCA9955 operate with a supply voltage range of 3 v to 5.5 v and the constant current sink ledn outputs allow up to 40 v for the led supply. the output peak current is adjustable with an 8-bit linear dac from 225 ? a to 57 ma. these devices have built-in open, short load and overtemperature detection circuitry. the error information from the corresponding register can be read via the i 2 c-bus. additionally, a thermal shutdown feature protects the de vice when internal junction temperature exceeds the limit allo wed for the process. the pca9952 and PCA9955 devices have fast-mode plus (fm+) i 2 c-bus interface. fm+ devices offer higher frequency (up to 1 mhz) or more densely populated bus operation (up to 4000 pf). the pca9952 is identical to PCA9955 except for the following differences: ? the pca9952 has only three hardware address pins compared to four on PCA9955. ? the pca9952 has an output enable pin (oe ) and the PCA9955 does not. the active low output enable input pin (oe ), available only on pca9952, blinks all the ledn outputs and can be used to externally pwm the outputs, which is useful when multiple devices need to be dimmed or blinked together without using software control. software programmable led group and three sub call i 2 c-bus addresses allow all or defined groups of pca9952/55 devices to respond to a common i 2 c-bus address, allowing for example, all red leds to be turned on or off at the same time or marquee chasing effect, thus minimizing i 2 c-bus commands. on powe r-up, pca9952/55 will have a unique sub call address to identify it as a 16-channel led driver. this allows mixing of devices with different channel widths. four hardware address pins on PCA9955 allow up to 16 devices on the same bus. in the case of pca9952, three hardware address pins allow up to 8 devices on the same bus. pca9952; PCA9955 16-channel fm+ i 2 c-bus 57 ma constant current led driver rev. 7.1 ? 29 june 2015 product data sheet
pca9952_PCA9955 all information provided in this document is subject to legal disclaimers. ? nxp semiconductors n.v. 2015. all ri ghts reserved. product data sheet rev. 7.1 ? 29 june 2015 2 of 48 nxp semiconductors pca9952; PCA9955 16-channel fm+ i 2 c-bus 57 ma constant current led driver the software reset (swrst) function allows the master to perform a reset of the pca9952/55 through the i 2 c-bus, identical to the power-on reset (por) that initializes the registers to their default state causing the output current switches to be off (led off). this allows an easy and quick way to reco nfigure all device registers to the same condition. 2. features and benefits ? 16 led drivers. each output programmable at: ? off ? on ? programmable led brightness ? programmable group dimming/blinking mi xed with individual led brightness ? programmable ledn output enable delay to reduce emi and surge currents ? 16 constant current output channels can sink up to 57 ma, tolerate up to 40 v when off ? output current adjusted through an external resistor ? output current accuracy ? 6 % between output channels ? 8 % between pca9952/55 devices ? open/short load/overtemperature detection mode to detect individual led errors ? 1 mhz fast-mode plus compatible i 2 c-bus interface with 30 ma high drive capability on sda output for driving high capacitive buses ? 256-step (8-bit) linear programmable brightness per ledn output varying from fully off (default) to maximum brightness using a 31.25 khz pwm signal ? 256-step group brightness control allows general dimming (using a 122 hz pwm signal) from fully off to maximum brightness (default) ? 256-step group blinking with frequency programmable from 15 hz to 16.8 s and duty cycle from 0 % to 99.6 % ? output state change programmable on the acknowledge or the stop command to update outputs byte-by-byte or all at the same time (default to ?change on stop?). ? active low output enable (oe ) input pin (only on pca9952) allows for hardware blinking and dimming of the leds ? four hardware address pins allow 16 PCA9955 devices to be connected to the same i 2 c-bus and to be individually programmed ? four software programmable i 2 c-bus addresses (one led group call address and three led sub call addresses) allow groups of devices to be addressed at the same time in any combination (for example, one re gister used for ?all call? so that all the pca9952/55s on the i 2 c-bus can be addressed at the same time and the second register used for three different addresses so that 1 3 of all devices on the bus can be addressed at the same time in a group). software enable and disable for each programmable i 2 c-bus address. ? unique power-up default sub call address a llows mixing of devices with different channel widths ? software reset feature (s wrst call) allows the devic e to be reset through the i 2 c-bus ? 8 mhz internal oscillator requ ires no external components pca9952_PCA9955 all information provided in this document is subject to legal disclaimers. ? nxp semiconductors n.v. 2015. all ri ghts reserved. product data sheet rev. 7.1 ? 29 june 2015 3 of 48 nxp semiconductors pca9952; PCA9955 16-channel fm+ i 2 c-bus 57 ma constant current led driver ? internal power-on reset ? noise filter on sda/scl inputs ? no glitch on led on power-up ? low standby current ? operating power supply voltage (v dd ) range of 3 v to 5.5 v ? 5.5 v tolerant inputs on non-led pins ? operating temperature: ? 20 q c to +85 q c (pca9952tw, PCA9955tw) ? 40 q c to +85 q c (pca9952tw/q900, PCA9955tw/q900) ? esd protection exceeds 2000 v hbm per jesd22-a114, 750 v cdm (pca9952tw, PCA9955tw), and 500 v cdm (pca9952tw/q900, PCA9955tw/q900) per jesd22-c101 ? latch-up testing is done to jedec standard jesd78 class ii, level b ? packages offere d: htssop28 3. applications ? amusement products ? rgb or rgba led drivers ? led status information ? led displays ? lcd backlights ? keypad backlights for cellular phones or handheld devices ? automotive lighting (pca9952tw/q900, PCA9955tw/q900) pca9952_PCA9955 all information provided in this document is subject to legal disclaimers. ? nxp semiconductors n.v. 2015. all ri ghts reserved. product data sheet rev. 7.1 ? 29 june 2015 4 of 48 nxp semiconductors pca9952; PCA9955 16-channel fm+ i 2 c-bus 57 ma constant current led driver 4. ordering information [1] pca9952tw/q900 and PCA9955tw/q900 are aec-q100 compliant. 4.1 ordering options table 1. ordering information type number topside marking package name description version pca9952tw pca9952 htssop28 plastic thermal enhanced thin shrink small outline package; 28 leads; body width 4.4 mm; lead pitch 0.65 mm; exposed die pad sot1172-2 pca9952tw/q900 [1] pca9952 htssop28 plastic thermal enhanced thin shrink small outline package; 28 leads; body width 4.4 mm; lead pitch 0.65 mm; exposed die pad sot1172-2 PCA9955tw PCA9955 htssop28 plastic thermal enhanced thin shrink small outline package; 28 leads; body width 4.4 mm; lead pitch 0.65 mm; exposed die pad sot1172-2 PCA9955tw/q900 [1] PCA9955 htssop28 plastic thermal enhanced thin shrink small outline package; 28 leads; body width 4.4 mm; lead pitch 0.65 mm; exposed die pad sot1172-2 table 2. ordering options type number orderable part number package packing method minimum order quantity temperature pca9952tw pca9952tw,118 htssop28 reel 13? q1/t1 *standard mark smd 2500 t amb = ? 20 ? cto+85?c pca9952tw/q900 pca9952tw/q900,118 htssop28 reel 13? q1/t1 *standard mark smd 2500 t amb = ? 40 ? cto+85?c PCA9955tw PCA9955tw,118 htssop28 reel 13? q1/t1 *standard mark smd 2500 t amb = ? 20 ? cto+85?c PCA9955tw/q900 PCA9955tw/q900,118 htssop28 reel 13? q1/t1 *standard mark smd 2500 t amb = ? 40 ? cto+85?c pca9952_PCA9955 all information provided in this document is subject to legal disclaimers. ? nxp semiconductors n.v. 2015. all ri ghts reserved. product data sheet rev. 7.1 ? 29 june 2015 5 of 48 nxp semiconductors pca9952; PCA9955 16-channel fm+ i 2 c-bus 57 ma constant current led driver 5. block diagram dim repetition rate = 122 hz. blink repetition rate = 15 hz to every 16.8 seconds. (1) on PCA9955 this pin is address pin a3. on pca9952 this pin is oe . fig 1. block diagram of pca9952/55 a0 a1 a2 a3/oe (1) 002aae909 i 2 c-bus control input filter pca9952/55 power-on reset scl sda v dd v ss led state select register pwm register x brightness control grpfreq register grppwm register (duty cycle control) mux/ control '0' ? permanently off '1' ? permanently on dim clock 31.25 khz 8 mhz oscillator reset rext led14 led15 i/o regulator output driver, delay control and error detection input filter 256 200 k individual led current setting 8-bit dacs dac 15 led1 led0 dac 14 dac1 dac0 repetion rate 31.25 khz pca9952_PCA9955 all information provided in this document is subject to legal disclaimers. ? nxp semiconductors n.v. 2015. all ri ghts reserved. product data sheet rev. 7.1 ? 29 june 2015 6 of 48 nxp semiconductors pca9952; PCA9955 16-channel fm+ i 2 c-bus 57 ma constant current led driver 6. pinning information 6.1 pinning a. pca9952tw; pca9952tw/q900 b. PCA9955tw; PCA9955tw/q900 (1) thermal pad; connected to v ss . fig 2. pin configuration for htssop28 v dd sda scl reset v ss led15 led14 led13 led12 v ss led11 led10 led9 led8 rext a0 a1 a2 oe led0 led1 led2 led3 v ss led4 led5 led6 led7 002aae911 1 2 3 4 5 6 7 8 9 10 20 19 11 12 18 17 22 21 13 14 16 15 24 23 26 25 28 27 pca9952tw pca9952tw/q900 (1) 002aae912 1 2 3 4 5 6 7 8 9 10 20 19 11 12 18 17 22 21 13 14 16 15 24 23 26 25 28 27 rext v dd a0 sda a1 scl a2 reset a3 v ss led0 led15 led1 led14 led2 led13 led3 led12 v ss v ss led4 led11 led5 led10 led6 led9 led7 led8 (1) PCA9955tw PCA9955tw/q900 pca9952_PCA9955 all information provided in this document is subject to legal disclaimers. ? nxp semiconductors n.v. 2015. all ri ghts reserved. product data sheet rev. 7.1 ? 29 june 2015 7 of 48 nxp semiconductors pca9952; PCA9955 16-channel fm+ i 2 c-bus 57 ma constant current led driver 6.2 pin description [1] in order to obtain the best system level esd performance, a standard pull-up resistor (10 k ? typical) is required for any address pin connecting to v dd . for additional information on system level esd performance, please refer to appl ication notes an10897 and an11131. [2] htssop28 package supply ground is connected to both v ss pins and exposed center pad. v ss pins must be connected to supply ground for pr oper device operation. for enhanced thermal, electrical, and board level performance, the exposed pad needs to be soldered to the board using a corresponding thermal pad on the board and for proper heat conduction through the board, thermal vias need to be incorporated in the pcb in the thermal pad region. table 3. pca9952 pin description symbol pin type description rext 1 i current set resistor input; resistor to ground a0 2 i address input 0 [1] a1 3 i address input 1 [1] a2 4 i address input 2 [1] oe 5 i active low output enable led0 6 o led driver 0 led1 7 o led driver 1 led2 8 o led driver 2 led3 9 o led driver 3 led4 11 o led driver 4 led5 12 o led driver 5 led6 13 o led driver 6 led7 14 o led driver 7 led8 15 o led driver 8 led9 16 o led driver 9 led10 17 o led driver 10 led11 18 o led driver 11 led12 20 o led driver 12 led13 21 o led driver 13 led14 22 o led driver 14 led15 23 o led driver 15 reset 25 i active low reset input scl 26 i serial clock line sda 27 i/o serial data line v ss 10, 19, 24 [2] ground supply ground v dd 28 power supply supply voltage pca9952_PCA9955 all information provided in this document is subject to legal disclaimers. ? nxp semiconductors n.v. 2015. all ri ghts reserved. product data sheet rev. 7.1 ? 29 june 2015 8 of 48 nxp semiconductors pca9952; PCA9955 16-channel fm+ i 2 c-bus 57 ma constant current led driver [1] in order to obtain the best system level esd performance, a standard pull-up resistor (10 k ? typical) is required for any address pin connecting to v dd . for additional information on system level esd performance, please refer to appl ication notes an10897 and an11131. [2] htssop28 package supply ground is connected to both v ss pins and exposed center pad. v ss pins must be connected to supply ground for pr oper device operation. for enhanced thermal, electrical, and board level performance, the exposed pad needs to be soldered to the board using a corresponding thermal pad on the board and for proper heat conduction through the board, thermal vias need to be incorporated in the pcb in the thermal pad region. table 4. PCA9955 pin description symbol pin type description rext 1 i current set resistor input; resistor to ground a0 2 i address input 0 [1] a1 3 i address input 1 [1] a2 4 i address input 2 [1] a3 5 i address input 3 [1] led0 6 o led driver 0 led1 7 o led driver 1 led2 8 o led driver 2 led3 9 o led driver 3 led4 11 o led driver 4 led5 12 o led driver 5 led6 13 o led driver 6 led7 14 o led driver 7 led8 15 o led driver 8 led9 16 o led driver 9 led10 17 o led driver 10 led11 18 o led driver 11 led12 20 o led driver 12 led13 21 o led driver 13 led14 22 o led driver 14 led15 23 o led driver 15 reset 25 i active low reset input scl 26 i serial clock line sda 27 i/o serial data line v ss 10, 19, 24 [2] ground supply ground v dd 28 power supply supply voltage pca9952_PCA9955 all information provided in this document is subject to legal disclaimers. ? nxp semiconductors n.v. 2015. all ri ghts reserved. product data sheet rev. 7.1 ? 29 june 2015 9 of 48 nxp semiconductors pca9952; PCA9955 16-channel fm+ i 2 c-bus 57 ma constant current led driver 7. functional description refer to figure 1 ? block diagram of pca9952/55 ? . 7.1 device addresses following a start condition, the bus master must output the address of the slave it is accessing. for PCA9955 there are a maximum of 16 possible programmable addresses using the 4 hardware address pins. for pca9952 there are a maximum of 8 po ssible programmable addresses using the 3 hardware address pins. 7.1.1 regular i 2 c-bus slave address the i 2 c-bus slave address of the PCA9955 is shown in figure 3 . to conserve power, no internal pull-up resistors are incorporated on the hardware selectable address pins and they must be pulled high or low externally. figure 4 shows the i 2 c-bus slave address of the pca9952. remark: reserved i 2 c-bus addresses must be used with caution since they can interfere with: ? ?reserved for future use? i 2 c-bus addresses (0000 011, 1111 1xx) ? slave devices that use the 10-bit addressing scheme (1111 0xx) ? slave devices that are designed to resp ond to the general call address (0000 000) ? high-speed mode (hs-mode) master code (0000 1xx) the last bit of the address byte defines the operation to be performed. when set to logic 1 a read is selected, while a lo gic 0 selects a write operation. 7.1.2 led all call i 2 c-bus address ? default power-up value (allcalladr register): e0h or 1110 000x ? programmable through i 2 c-bus (volatile programming) ? at power-up, led all call i 2 c-bus address is enabled. pca9952/55 sends an ack when e0h (r/w = 0) or e1h (r/w = 1) is sent by the master. see section 7.3.10 ? allcalladr, led all call i 2 c-bus address ? for more detail. fig 3. PCA9955 slave address fig 4. pca9952 slave address 002aae914 1 1 0 a3 a2 a1 a0 r/w fixed hardware selectable slave address 002aae915 1 1 0 0 a2 a1 a0 r/w fixed hardware selectable slave address pca9952_PCA9955 all information provided in this document is subject to legal disclaimers. ? nxp semiconductors n.v. 2015. all ri ghts reserved. product data sheet rev. 7.1 ? 29 june 2015 10 of 48 nxp semiconductors pca9952; PCA9955 16-channel fm+ i 2 c-bus 57 ma constant current led driver remark: the default led all call i 2 c-bus address (e0h or 1110 000x) must not be used as a regular i 2 c-bus slave address since this addre ss is enabled at power-up. all of the pca9952/55s on the i 2 c-bus will acknowledg e the address if sent by the i 2 c-bus master. 7.1.3 led bit sub call i 2 c-bus addresses ? 3 different i 2 c-bus addresses can be used ? default power-up values: ? subadr1 register: ech or 1110 110x ? subadr2 register: ech or 1110 110x ? subadr3 register: ech or 1110 110x ? programmable through i 2 c-bus (volatile programming) ? at power-up, subadr1 is enabled while subadr2 and subadr3 i 2 c-bus addresses are disabled. remark: at power-up subadr1 identifies this device as a 16-channel driver. see section 7.3.9 ? led bit sub call i 2 c-bus addresses for pca9952/55 ? for more detail. remark: the default led sub call i 2 c-bus addresses may be used as regular i 2 c-bus slave addresses as long as they are disabled. 7.2 control register following the successful acknowledgement of the slave address, led all call address or led sub call address, the bus master will send a byte to the pca9 952/55, which will be stored in the control register. the lowest 7 bits are used as a pointer to determine which re gister will be accessed (d[6:0]). the highest bit is used as auto-increme nt flag (aif). the aif is active by default at power-up. this bit along with the mode1 register bit 5 and bit 6 provide the auto-increment feature. when the auto-increment flag is set (aif = logic 1), the seven low-order bits of the control register are automatically incremented afte r a read or write. this allows the user to program the registers sequentially. four differ ent types of auto-increment are possible, depending on ai1 and ai0 values of mode1 register. reset state = 80h remark: the control register does not apply to the software reset i 2 c-bus address. fig 5. control register 002aad850 aif d6 d5 d4 d3 d2 d1 d0 auto-increment flag register address pca9952_PCA9955 all information provided in this document is subject to legal disclaimers. ? nxp semiconductors n.v. 2015. all ri ghts reserved. product data sheet rev. 7.1 ? 29 june 2015 11 of 48 nxp semiconductors pca9952; PCA9955 16-channel fm+ i 2 c-bus 57 ma constant current led driver [1] ai1 and ai0 come from mode1 register. remark: other combinations not shown in ta b l e 5 (aif + ai[1:0] = 001b, 010b and 011b) are reserved and must not be used for proper device operation. aif + ai[1:0] = 000b is used when the same register must be accessed several times during a single i 2 c-bus communication, for example, changes the brightness of a single led. data is overwritten each time the register is accessed during a write operation. aif + ai[1:0] = 100b is used when all the registers must be sequentially accessed, for example, power-up programming. aif + ai[1:0] = 101b is used when the 16 led drivers must be individually programmed with different values during the same i 2 c-bus communication, for example, changing color setting to another color setting. aif + ai[1:0] = 110b is used when mode1 to ir ef15 registers must be programmed with different settings during the same i 2 c-bus communication. aif + ai[1:0] = 111b is used when the 16 led drivers must be individually programmed with different values in addition to global programming. only the 7 least significant bits d[6:0] ar e affected by the aif, ai1 and ai0 bits. when the control register is written, the regi ster entry point determined by d[6:0] is the first register that will be addressed (read or write operation), and can be anywhere between 00h and 41h (as defined in ta b l e 6 ). when aif = 1, the auto-increment flag is set and the rollover value at which the register increment stops and goes to the next one is determined by aif, ai1 and ai0. see ta b l e 5 for rollover values. for example, if mode1 register bit ai1 = 0 and ai0 = 1 and if the cont rol register = 1001 0000, then the register addressing sequence will be (in hexadecimal): 10 ? 11 ? ? ? 19 ? 0a ? 0b ? ? ? 19 ? 0a ? 0b ? ? as long as the master keeps sending or reading data. if mode1 register bit ai1 = 0 and ai0 = 0 and if the control register = 1010 0010, then the register addressing sequen ce will be (in hexadecimal): 22 ? 23 ? ? ? 41 ? 00 ? 01 ? ? ? 19 ? 0a ? 0b ? ? as long as the master keeps sending or reading data. table 5. auto-increment options aif ai1 [1] ai0 [1] function 0 0 0 no auto-increment 1 0 0 auto-increment for registers (00h to 41h) . d[6:0] roll over to 00h after the last register 41h is accessed. 1 0 1 auto-increment for individual brightness registers only (0ah to 19h). d[6:0] roll over to 0ah after the last register (19h) is accessed. 1 1 0 auto-increment for mode1 to iref 15 control registers (00h to 31h). d[6:0] roll over to 00h after the last register (31h) is accessed. 1 1 1 auto-increment for global control regi sters and individual brightness registers (08h to 19h). d[6:0] roll over to 08h after the last register (19h) is accessed. pca9952_PCA9955 all information provided in this document is subject to legal disclaimers. ? nxp semiconductors n.v. 2015. all ri ghts reserved. product data sheet rev. 7.1 ? 29 june 2015 12 of 48 nxp semiconductors pca9952; PCA9955 16-channel fm+ i 2 c-bus 57 ma constant current led driver if mode1 register bit ai1 = 0 and ai0 = 1 and if the control register = 1000 0101, then the register addressing sequen ce will be (in hexadecimal): 05 ? 06 ? ? ? 19 ? 0a ? 0b ? ? ? 19 ? 0a ? 0b ? ? as long as the master keeps sending or reading data. remark: writing to registers marked ?not used? will return nack. 7.3 register definitions table 6. register summary [1] register number (hexadecimal) d6 d5 d4 d3 d2 d1 d0 name type function 00h 0000000mode1 r ead/write mode register 1 01h 0000001mode2 r ead/write mode register 2 02h 0000010ledout0 r ead/write ledn out put state 0 03h 0000011ledout1 r ead/write ledn out put state 1 04h 0000100ledout2 r ead/write ledn out put state 2 05h 0000101ledout3 r ead/write ledn out put state 3 06h 0000110- r ead/write not used [1] 07h 0000111- r ead/write not used [1] 08h 0001000grppwm r ead/write group duty cycle control 09h 0001001grpfreq r ead/write group frequency 0ah 0001010pwm0 r ead/write brightness control led0 0bh 0001011pwm1 r ead/write brightness control led1 0ch 0001100pwm2 r ead/write brightness control led2 0dh 0001101pwm3 r ead/write brightness control led3 0eh 0001110pwm4 r ead/write brightness control led4 0fh 0001111pwm5 r ead/write brightness control led5 10h 0010000pwm6 r ead/write brightness control led6 11h 0010001pwm7 r ead/write brightness control led7 12h 0010010pwm8 r ead/write brightness control led8 13h 0010011pwm9 r ead/write brightness control led9 14h 0010100pwm10 r ead/write brightness control led10 15h 0010101pwm11 r ead/write brightness control led11 16h 0010110pwm12 r ead/write brightness control led12 17h 0010111pwm13 r ead/write brightness control led13 18h 0011000pwm14 r ead/write brightness control led14 19h 0011001pwm15 r ead/write brightness control led15 1ah to 21h -------- r ead/write not used [1] 22h 0100010iref0 r ead/write output gain control register 0 23h 0100011iref1 r ead/write output gain control register 1 24h 0100100iref2 r ead/write output gain control register 2 25h 0100101iref3 r ead/write output gain control register 3 26h 0100110iref4 r ead/write output gain control register 4 pca9952_PCA9955 all information provided in this document is subject to legal disclaimers. ? nxp semiconductors n.v. 2015. all ri ghts reserved. product data sheet rev. 7.1 ? 29 june 2015 13 of 48 nxp semiconductors pca9952; PCA9955 16-channel fm+ i 2 c-bus 57 ma constant current led driver [1] remark: writing to registers marked ?not used? will return a nack. [2] remark: writing to registers marked ?reserved? wi ll not change any functionality in the chip. 27h 0100111iref5 r ead/write output gain control register 5 28h 0101000iref6 r ead/write output gain control register 6 29h 0101001iref7 r ead/write output gain control register 7 2ah 0101010iref8 r ead/write output gain control register 8 2bh 0101011iref9 r ead/write output gain control register 9 2ch 0101100iref10 r ead/write output gain control register 10 2dh 0101101iref11 r ead/write output gain control register 11 2eh 0101110iref12 r ead/write output gain control register 12 2fh 0101111iref13 r ead/write output gain control register 13 30h 0110000iref14 r ead/write output gain control register 14 31h 0110001iref15 r ead/write output gain control register 15 32h to 39h -------- r ead/write not used [1] 3ah 0111010offset r ead/write offset/delay on ledn outputs 3bh 0111011subadr1 r ead/write i 2 c-bus subaddress 1 3ch 0111100subadr2 r ead/write i 2 c-bus subaddress 2 3dh 0111101subadr3 r ead/write i 2 c-bus subaddress 3 3eh 0111110allcalladrr ead/write all call i 2 c-bus address 3fh 0111111r eserved1 read/write reserved [2] 40h 1000000r eserved2 read only reserved [2] 41h 1000001r eserved3 read only reserved [2] 42h 1000010pwmall write only brightness control for all ledn 43h 1000011irefall write only output gain control for all registers iref0 to iref15 44h 1000100eflag0 r ead only output error flag 0 45h 1000101eflag1 r ead only output error flag 1 46h to 7fh -------- r ead only not used [1] table 6. register summary [1] ?continued register number (hexadecimal) d6 d5 d4 d3 d2 d1 d0 name type function pca9952_PCA9955 all information provided in this document is subject to legal disclaimers. ? nxp semiconductors n.v. 2015. all ri ghts reserved. product data sheet rev. 7.1 ? 29 june 2015 14 of 48 nxp semiconductors pca9952; PCA9955 16-channel fm+ i 2 c-bus 57 ma constant current led driver 7.3.1 mode1 ? mode register 1 [1] it takes 500 ? s max. for the oscillator to be up and running once sleep bit has been set to logic 0. timings on ledn outputs are not guaranteed if pwmx, grppwm or grpfreq registers are accessed within the 500 ? s window. [2] no blinking or dimming is possi ble when the oscillator is off. [3] the device must be reset if the led driver output state is set to ldrx=11 after the device is set back to normal mode. 7.3.2 mode2 ? mode register 2 table 7. mode1 - mode register 1 (address 00h) bit description legend: * default value. bit symbol access value description 7 aif read only 0 register auto-increment disabled. 1* register auto-increment enabled. 6 ai1 r/w 0* auto-increment bit 1 = 0. auto -increment range as defined in table 5 . 1 auto-increment bit 1 = 1. auto-inc rement range as defined in table 5 . 5 ai0 r/w 0* auto-increment bit 0 = 0. auto -increment range as defined in table 5 . 1 auto-increment bit 0 = 1. auto-inc rement range as defined in table 5 . 4 sleep r/w 0* normal mode [1] . 1 low-power mode. oscillator off [2] [3] . 3 sub1 r/w 0 pca9952; PCA9955 does not respond to i 2 c-bus subaddress 1. 1* pca9952; PCA9955 responds to i 2 c-bus subaddress 1. 2 sub2 r/w 0* pca9952; PCA9955 does not respond to i 2 c-bus subaddress 2. 1 pca9952; PCA9955 responds to i 2 c-bus subaddress 2. 1 sub3 r/w 0* pca9952; PCA9955 does not respond to i 2 c-bus subaddress 3. 1 pca9952; PCA9955 responds to i 2 c-bus subaddress 3. 0 allcall r/w 0 pca9952; PCA9955 does not respond to led all call i 2 c-bus address. 1* pca9952; PCA9955 responds to led all call i 2 c-bus address. table 8. mode2 - mode register 2 (address 01h) bit description legend: * default value. bit symbol access value description 7 overtemp read only 0* o.k. 1 overtemperatu re condition 6 faulttest r/w 0* led fault test complete 1 start fault test 5 dmblnk r/w 0* group control = dimming. 1 group control = blinking. 4 - read only 0* reserved 3 och r/w 0* outputs change on stop command 1 outputs change on ack 2 - read only 1* reserved 1 - read only 0* reserved 0 - read only 1* reserved pca9952_PCA9955 all information provided in this document is subject to legal disclaimers. ? nxp semiconductors n.v. 2015. all ri ghts reserved. product data sheet rev. 7.1 ? 29 june 2015 15 of 48 nxp semiconductors pca9952; PCA9955 16-channel fm+ i 2 c-bus 57 ma constant current led driver 7.3.3 ledout0 to ledout3, led driver output state ldrx = 00 ? led driver x is off (default power-up state). ldrx = 01 ? led driver x is fully on (individual brightness and group dimming/blinking not controlled). ldrx = 10 ? led driver x individual brightness can be controlled through its pwmx register. ldrx = 11 ? led driver x individual brightness and group dimming/blinking can be controlled through its pwmx register and the grppwm registers. remark: setting the device in low power mode while being on grou p dimming/blinking mode may cause the led output state to be in an unknown state after the device is set back to normal mode. the device must be reset and all register values reprogrammed. 7.3.4 grppwm, group duty cycle control when dmblnk bit (mode2 register) is programmed with logic 0, a 122 hz fixed frequency signal is superimposed with the 31. 25 khz individual brightness control signal. grppwm is then used as a global brightness control allowing the ledn outputs to be dimmed with the same value. the value in grpfreq is then a ?don?t care?. table 9. ledout0 to ledout3 - led driver ou tput state registers (address 02h to 05h) bit description legend: * default value. address register bit symbol access value description 02h ledout0 7:6 ldr3 r/w 00* led3 output state control 5:4 ldr2 r/w 00* led2 output state control 3:2 ldr1 r/w 00* led1 output state control 1:0 ldr0 r/w 00* led0 output state control 03h ledout1 7:6 ldr7 r/w 00* led7 output state control 5:4 ldr6 r/w 00* led6 output state control 3:2 ldr5 r/w 00* led5 output state control 1:0 ldr4 r/w 00* led4 output state control 04h ledout2 7:6 ldr11 r/w 00* led11 output state control 5:4 ldr10 r/w 00* led10 output state control 3:2 ldr9 r/w 00* led9 output state control 1:0 ldr8 r/w 00* led8 output state control 05h ledout3 7:6 ldr15 r/w 00* led15 output state control 5:4 ldr14 r/w 00* led14 output state control 3:2 ldr13 r/w 00* led13 output state control 1:0 ldr12 r/w 00* led12 output state control table 10. grppwm - group brightness control register (address 08h) bit description legend: * default value address register bit symbol access value description 08h grppwm 7:0 gdc[7:0] r/w 1111 1111* grppwm register pca9952_PCA9955 all information provided in this document is subject to legal disclaimers. ? nxp semiconductors n.v. 2015. all ri ghts reserved. product data sheet rev. 7.1 ? 29 june 2015 16 of 48 nxp semiconductors pca9952; PCA9955 16-channel fm+ i 2 c-bus 57 ma constant current led driver general brightness for the 16 outputs is co ntrolled through 256 linear steps from 00h (0 % duty cycle = ledn output off) to ffh (9 9.6 % duty cycle = maximum brightness). applicable to ledn outputs programmed with ldrx = 11 (ledout0 to ledout3 registers). when dmblnk bit is programmed with logic 1, grppwm and grpfreq registers define a global blinking pattern, where grpfreq contains the blinking period (from 67 ms to 16.8 s) and grppwm the duty cycle (on/off ratio in %). (1) 7.3.5 grpfreq, group frequency grpfreq is used to program the global blinking period when dmblnk bit (mode2 register) is equal to 1. value in this re gister is a ?don?t care? when dmblnk = 0. applicable to ledn outputs programmed with ldrx = 11 (ledout0 to ledout3 registers). blinking period is controlled through 256 linear steps from 00h (67 ms, frequency 15 hz) to ffh (16.8 s). (2) 7.3.6 pwm0 to pwm15, individual brightness control duty cycle gdc 7 : 0 ?? 256 -------------------------- = table 11. grpfreq - group frequency register (address 09h) bit description legend: * default value. address register bit symbol access value description 09h grpfreq 7:0 gfrq[7:0] r/w 0000 0000* grpfreq register global blinking period gfrq 7 : 0 ?? 1 + 15.26 --------------------------------------- - s ?? = table 12. pwm0 to pwm15 - pwm registers 0 to 15 (address 0ah to 19h) bit description legend: * default value. address register bit symbol access value description 0ah pwm0 7:0 idc0[7:0] r/w 0000 0000* pwm0 individual duty cycle 0bh pwm1 7:0 idc1[7:0] r/w 0000 0000* pwm1 individual duty cycle 0ch pwm2 7:0 idc2[7:0] r/w 0000 0000* pwm2 individual duty cycle 0dh pwm3 7:0 idc3[7:0] r/w 0000 0000* pwm3 individual duty cycle 0eh pwm4 7:0 idc4[7:0] r/w 0000 0000* pwm4 individual duty cycle 0fh pwm5 7:0 idc5[7:0] r/w 0000 0000* pwm5 individual duty cycle 10h pwm6 7:0 idc6[7:0] r/w 0000 0000* pwm6 individual duty cycle 11h pwm7 7:0 idc7[7:0] r/w 0000 0000* pwm7 individual duty cycle 12h pwm8 7:0 idc8[7:0] r/w 0000 0000* pwm8 individual duty cycle 13h pwm9 7:0 idc9[7:0] r/w 0000 0000* pwm9 individual duty cycle 14h pwm10 7:0 idc10[7:0] r/w 0000 0000* pwm10 individual duty cycle 15h pwm11 7:0 idc11[7:0] r/w 0000 0000* pwm11 individual duty cycle 16h pwm12 7:0 idc12[7:0] r/w 0000 0000* pwm12 individual duty cycle pca9952_PCA9955 all information provided in this document is subject to legal disclaimers. ? nxp semiconductors n.v. 2015. all ri ghts reserved. product data sheet rev. 7.1 ? 29 june 2015 17 of 48 nxp semiconductors pca9952; PCA9955 16-channel fm+ i 2 c-bus 57 ma constant current led driver a 31.25 khz fixed frequency signal is used fo r each output. duty cycle is controlled through 256 linear steps from 00h (0 % duty cycle = ledn output off) to ffh (99.6 % duty cycle = ledn output at maximum br ightness). applicable to ledn outputs programmed with ldrx = 10 or 11 (ledout0 to ledout3 registers). (3) remark: the first lower end 8 steps of pwm and the last (higher end) steps of pwm will not have effective brightness control of leds due to edge rate control of ledn output pins. 7.3.7 iref0 to iref15, ledn output current value registers these registers reflect the gain settings for output current for led0 to led15. 17h pwm13 7:0 idc13[7:0] r/w 0000 0000* pwm13 individual duty cycle 18h pwm14 7:0 idc14[7:0] r/w 0000 0000* pwm14 individual duty cycle 19h pwm15 7:0 idc15[7:0] r/w 0000 0000* pwm15 individual duty cycle table 12. pwm0 to pwm15 - pwm registers 0 to 15 (address 0ah to 19h) bit description ?continued address register bit symbol access value description duty cycle idcx 7 : 0 ?? 256 --------------------------- = table 13. iref0 to iref15 - ledn output gain control registers (address 22h to 31h) bit description legend: * default value. address register bit access value description 22h iref0 7:0 r/w 00h* led0 output current setting 23h iref1 7:0 r/w 00h* led1 output current setting 24h iref2 7:0 r/w 00h* led2 output current setting 25h iref3 7:0 r/w 00h* led3 output current setting 26h iref4 7:0 r/w 00h* led4 output current setting 27h iref5 7:0 r/w 00h* led5 output current setting 28h iref6 7:0 r/w 00h* led6 output current setting 29h iref7 7:0 r/w 00h* led7 output current setting 2ah iref8 7:0 r/w 00h* led8 output current setting 2bh iref9 7:0 r/w 00h* led9 output current setting 2ch iref10 7:0 r/w 00h* led10 output current setting 2dh iref11 7:0 r/w 00h* led11 output current setting 2eh iref12 7:0 r/w 00h* led12 output current setting 2fh iref13 7:0 r/w 00h* led13 output current setting 30h iref14 7:0 r/w 00h* led14 output current setting 31h iref15 7:0 r/w 00h* led15 output current setting pca9952_PCA9955 all information provided in this document is subject to legal disclaimers. ? nxp semiconductors n.v. 2015. all ri ghts reserved. product data sheet rev. 7.1 ? 29 june 2015 18 of 48 nxp semiconductors pca9952; PCA9955 16-channel fm+ i 2 c-bus 57 ma constant current led driver 7.3.8 offset ? ledn output delay offset register the offset register should not be changed while the ledn output is on and pulsing. the PCA9955 can be programmed to have turn-on delay between ledn outputs. this helps to reduce peak current for the v dd supply and reduces emi. the order in which the ledn outputs are enabled will always be the same (channel 0 will enable first an d channel 15 will enable last). offset control register bits [3:0] determine the delay used between the turn-on times as follows: 0000 = no delay between outputs (all on, all off at the same time) 0001 = delay of 1 clock cycle (1 25 ns) between successive outputs 0010 = delay of 2 clock cycles (250 ns) between successive outputs 0011 = delay of 3 clock cycles (375 ns) between successive outputs : 1111 = delay of 15 clock cycles (1.875 ? s) between successive outputs example: if the value in the offset register is 1000 the corresponding delay = 8 ? 125 ns = 1 ? s delay between successive outputs. channel 0 turns on at time 0 ? s channel 1 turns on at time 1 ? s channel 2 turns on at time 2 ? s channel 3 turns on at time 3 ? s channel 4 turns on at time 4 ? s channel 5 turns on at time 5 ? s channel 6 turns on at time 6 ? s channel 7 turns on at time 7 ? s channel 8 turns on at time 8 ? s channel 9 turns on at time 9 ? s channel 10 turns on at time 10 ? s channel 11 turns on at time 11 ? s channel 12 turns on at time 12 ? s channel 13 turns on at time 13 ? s channel 14 turns on at time 14 ? s channel 15 turns on at time 15 ? s table 14. offset - ledn output delay offset register (address 3ah) bit description legend: * default value. address register bit access value description 3ah offset 7:4 read only 0000* not used 3:0 r/w 1000* ledn output delay offset factor pca9952_PCA9955 all information provided in this document is subject to legal disclaimers. ? nxp semiconductors n.v. 2015. all ri ghts reserved. product data sheet rev. 7.1 ? 29 june 2015 19 of 48 nxp semiconductors pca9952; PCA9955 16-channel fm+ i 2 c-bus 57 ma constant current led driver 7.3.9 led bit sub call i 2 c-bus addresses for pca9952/55 default power-up values are ech, ech, ech. at power-up, subadr1 is enabled while subadr2 and subadr3 are disabled. the power-up default bit subaddress of ech indicates that this device is a 16-channel led driver. all three subaddresses are programmable. once subaddresses have been programmed to their right values, subx bits need to be set to logic 1 in order to have the device acknowledging these addresses (mode1 register) (0). when subx is set to logic 1, the corresponding i 2 c-bus subaddress can be used during either an i 2 c-bus read or write sequence. 7.3.10 allcalladr, led all call i 2 c-bus address the led all call i 2 c-bus address allows all the pca9952/55s on the bus to be programmed at the same time (allcall bit in register mode1 must be equal to logic 1 (power-up default state)). this address is programmable through the i 2 c-bus and can be used during either an i 2 c-bus read or write sequence. the register address can also be programmed as a sub call. only the 7 msbs representing the all call i 2 c-bus address are valid. the lsb in allcalladr register is a read-only bit (0). if allcall bit = 0, the device does not acknowledge the address programmed in register allcalladr. 7.3.11 reserved1 this register is reserved. 7.3.12 reserved2, reserved3 these registers are reserved. table 15. subadr1 to subadr3 - i 2 c-bus subaddress registers 1 to 3 (address 3bh to 3dh) bit description legend: * default value. address register bit symbol access value description 3bh subadr1 7:1 a1[7:1] r/w 1110 110* i 2 c-bus subaddress 1 0 a1[0] r only 0* reserved 3ch subadr2 7:1 a2[7:1] r/w 1110 110* i 2 c-bus subaddress 2 0 a2[0] r only 0* reserved 3dh subadr3 7:1 a3[7:1] r/w 1110 110* i 2 c-bus subaddress 3 0 a3[0] r only 0* reserved table 16. allcalladr - led all call i 2 c-bus address register (address 3eh) bit description legend: * default value. address register bit symbol access value description 3eh allcalladr 7:1 ac[7:1] r/w 1110 000* allcall i 2 c-bus address register 0 ac[0] r only 0* reserved pca9952_PCA9955 all information provided in this document is subject to legal disclaimers. ? nxp semiconductors n.v. 2015. all ri ghts reserved. product data sheet rev. 7.1 ? 29 june 2015 20 of 48 nxp semiconductors pca9952; PCA9955 16-channel fm+ i 2 c-bus 57 ma constant current led driver 7.3.13 pwmall ? brightness control for all ledn outputs when programmed, the value in this register will be used fo r pwm duty cycle for all the ledn outputs and will be reflected in pwm0 through pwm15 registers. write to any of the pwm0 to pwm15 regist ers will overwrite the va lue in corresponding pwmn register programmed by pwmall. 7.3.14 irefall register: output current value for all ledn outputs the output current setting for all outputs is he ld in this register. wh en this register is written to or updated, all ledn outputs will be set to a current corresponding to this register value. write to iref0 to iref15 will overwr ite the output cu rrent settings. 7.3.15 led driver constant current outputs in led display applications, pca9952/55 provides nearly no current variations from channel to channel and from device to device. the maximum current skew between channels is less than ? 6 % and less than ? 8 % between devices. 7.3.15.1 adjusting output peak current the pca9952/55 scales up the reference current (i ref ) set by the external resistor (r ext ) to sink the output current (i o ) at each output port. the maximum output peak current for the outputs can be set using r ext . in addition, the constant valu e for current drive at each of the outputs is independently programmable using command registers iref0 to iref15. alternatively, programming the irefall register allows all outputs to be set at one current value determined by the value in irefall register. equation 4 and equation 5 can be used to calculate t he minimum and maximum constant current values that can be programmed for the outputs for a chosen r ext . (4) (5) for a given irefx setting, . table 17. pwmall - brightness control for all ledn outputs register (address 42h) bit description legend: * default value. address register bit access value description 42h pwmall 7:0 write only 0000 0000* duty cycle for all ledn outputs table 18. irefall - output gain control for a ll ledn outputs (addre ss 43h) bit description legend: * default value. bit symbol access value description 7:0 irefall write only 00h* current gain setting for all ledn outputs. i o _ led _ lsb 900 mv r ext ------------------- 1 4 -- - ? i o _ led _ max 255 i o _ led _ lsb ? ?? 900 mv r ext ------------------- 255 4 -------- - ? ?? ?? i o _ led irefx 900 mv r ext ------------------- ? 1 4 -- - ? pca9952_PCA9955 all information provided in this document is subject to legal disclaimers. ? nxp semiconductors n.v. 2015. all ri ghts reserved. product data sheet rev. 7.1 ? 29 june 2015 21 of 48 nxp semiconductors pca9952; PCA9955 16-channel fm+ i 2 c-bus 57 ma constant current led driver example 1: if r ext =1k ? , i o _led_lsb = 225 ? a, i o _led_max = 57.375 ma. so each channel can be programmed with its individual irefx in 256 steps and in 225 ? a increments to a maximum output current of 57.375 ma independently. example 2: if r ext =2k ? , i o _led_lsb = 112.5 ? a, i o _led_max = 28.687 ma. so each channel can be programmed with its individual irefx in 256 steps and in 112.5 ? a increments to a maximum output channel of 28.687 ma independently. i o(ledn) (ma) = irefx ? (0.9 / 4) / r ext (k ? ) maximum i o(ledn) (ma) = 255 ? (0.9 / 4) / r ext (k ? ) remark: default irefx at power-up = 0. fig 6. maximum i led versus r ext (1) assuming r ext = 1 k ? . fig 7. i o(target) versus irefx value r ext (k) 1 10 9 48 2 002aag288 0 60 40 20 80 i o(ledn) (ma) 5 6 irefx = 255 3 7 irefx[7:0] value 0 255 191 127 63 002aaf396 20 30 10 40 57.375 (1) i o(target) (ma) 0 31 95 159 223 pca9952_PCA9955 all information provided in this document is subject to legal disclaimers. ? nxp semiconductors n.v. 2015. all ri ghts reserved. product data sheet rev. 7.1 ? 29 june 2015 22 of 48 nxp semiconductors pca9952; PCA9955 16-channel fm+ i 2 c-bus 57 ma constant current led driver 7.3.16 led error detection the pca9952/55 is capable of detecting an led open or a short condition at its ledn output. to detect led error status, user must initiate the ledn output fault test. the ledout channel under test must be on to conduct this test. setting mode2[6] = 1 initiates the faulttest . the entire test sequence takes up to 52 ? s. once the test cycle begins, all outputs will be turned off (no ma tter where they are in the group or individual pwm cycle) unt il entire test sequence is finished and next register read or write is activated. then each output will be enabled at its previously defined output current leve l based on irefx for 1.25 ? s. only those channels with an ledout value other than 00h will be tested. if the output is select ed to be fully on, individual dim, or individual and group dim that channel w ill be tested; however, its operation will be affect ed for one entire 32 ? s individual pwm cycle. at the end of the test cycle pca9952/55 writes out the 16 error flag bits to eflagn. before reading the erro r flag register eflagn , user should verify if the faulttest is complete by reading mode2 register. mode2[6] = 0 indicates that th e test is complete and the error status is ready in eflag0 and eflag1. the error flags in registers eflag0 and eflag1 can now be read. remark: the led open and short-circuit error status bits share the same error flag registers (eflag0/eflag1). if both led op en and short-circuit conditions exist on different led outputs, the error status bits in error flag registers report only the open-circuits first and disregards the short-circ uits. if only one of the two conditions (that is, led open-circuits or short-circuits) exists , then the error status bits in error flag registers will report all of thos e faulted channels. for all unu sed led outputs, user must program their led outputs to the ?off? state (ldrx = 00) and irefx value to 00h, and all unused led output pins must be pulled up to v dd with a recommended 100 k ? shared resistor. the states of the unused led ch annels have no effect upon the faulttest and always return 0s in eflag0/eflag1 registers. 7.3.16.1 open-circuit detection principle the pca9952/55 led open-circuit detection compares the effective current level i o with the open load detection threshold current i th(det) . if i o is below the threshold i th(det) , the pca9952/55 detects an open load condition. this error status can be read out as an error flag through the registers eflag0 and eflag1. for open-circuit error detection of an output channel, that channel must be on. table 19. eflag0, eflag1 - error flag registers (address 44h, 45h) bit description legend: * default value. address register bit access value description 44h eflag0 7:0 r only 00h* error flag 0; lower 8-bit channel error status 45h eflag1 7:0 r only 00h* error flag 1; upper 8-bit channel error status table 20. open-circuit detection state of output port condition of output current error status code description off i o = 0 ma 0 detection not possible on i o pca9952_PCA9955 all information provided in this document is subject to legal disclaimers. ? nxp semiconductors n.v. 2015. all ri ghts reserved. product data sheet rev. 7.1 ? 29 june 2015 23 of 48 nxp semiconductors pca9952; PCA9955 16-channel fm+ i 2 c-bus 57 ma constant current led driver [1] i th(det) =0.5 ? i o(target) (typical). this threshold may be differ ent for each i/o and only depends on irefx and r ext . 7.3.16.2 short-circuit detection principle the led short-circuit detection compares the effective voltage level (v o ) with the shorted-load detection threshold voltages v th(trig) . if v o is above the v th(trig) threshold, the pca9952/55 detects a shorted-load condition. if v o is below the v th(trig) threshold, no error is detected or error bit is rese t. this error status can be read out as an error flag through the registers eflag0 and eflag1. for short-ci rcuit error detection, a channel must be on. [1] v th ? 2.5 v. remark: the error status does not distinguish between an led short condition and an led open condition. when an led fault condition is noted, the ledn outputs should be turned off to prevent heat dissipation in the chip and the repair should be done. 7.3.17 overtemperature protection if the pca9952/55 chip temperature exceeds its limit (t th(otp) , see ta b l e 2 4 ), all output channels will be disabled unt il the temperature drops belo w its limit minus a small hysteresis (t hys , see ta b l e 2 4 ). when an overtemperature situation is encountered, the overtemp flag (bit 7) is set in the mode2 register. once the die temperature reduces below the t th(otp) ? t hys , the chip will return to the sa me condition it was prior to the overtemperature even t and the overtemp flag will be cleared. 7.4 active low out put enable input remark: only the pca9952 has the oe pin. the active low output enable (oe ) pin on pca9952 allows to enable or disable all the ledn outputs at the same time. ? when a low level is applied to oe pin, all the ledn outputs are enabled. ? when a high level is applied to oe pin, all the ledn outputs are high-impedance. the oe pin can be used as a synchronization si gnal to switch on/off several pca9952 devices at the same time. this requires an exte rnal clock reference that provides blinking period and the duty cycle. the oe pin can also be used as an external dimming control signal. the frequency of the external clock must be high enough not to be seen by the human eye, and the duty cycle value determines the brightness of the leds. table 21. shorted-load detection state of output port condition of output voltage error status code description off - 0 detection not possible on v o ? v th(trig) [1] 1 short-circuit v o pca9952_PCA9955 all information provided in this document is subject to legal disclaimers. ? nxp semiconductors n.v. 2015. all ri ghts reserved. product data sheet rev. 7.1 ? 29 june 2015 25 of 48 nxp semiconductors pca9952; PCA9955 16-channel fm+ i 2 c-bus 57 ma constant current led driver the i 2 c-bus master must interpret a non-acknowledge from the pca9952/55 (at any time) as a ?swrst call abort?. the pca9952/55 does not initiate a reset of its registers. this happens only when the format of the swrst call sequence is not correct. 7.8 individual brightness contro l with group dimming/blinking a 31.25 khz fixed frequency signal with progr ammable duty cycle (8 bits, 256 steps) is used to control individually the brightness for each led. on top of this signal, one of the following si gnals can be superimposed (this signal can be applied to the 16 ledn outputs control registers ledout0 to ledout3): ? a lower 122 hz fixed frequency signal with programmable duty cycle (8 bits, 256 steps) is used to provide a global brightness control. ? a programmable frequency signal from 15 hz to every 16.8 seconds (8 bits, 256 steps) with programmable duty cycle (8 bits, 256 steps) is used to provide a global blinking control. fig 8. swrst call 0 0 0 0 0 0 0 a s 0 general call address start condition acknowledge from slave 002aac900 swrst data byte 1 a acknowledge from slave p stop condition 0000110 0 minimum pulse width for ledn brightness control is 125 ns. minimum pulse width for group dimming is 32 ? s. when m = 1 (grppwm register value), the re sulting ledn brightness control + group dimming signal will have 1 pulse of the led brightness control signal (pulse width = n ? 125 ns, with ?n? defined in pwmx register). this resulting brightness + group dimming signal above shows a resulting control signal with m = 8. fig 9. brightness + group dimming signals 123456789101112 251 252 253 254 255 256 1234567891011 brightness control signal (ledn) m 256 125 ns with m = (0 to 255) (grppwm register) n 125 ns with n = (0 to 255) (pwmx register) 256 125 ns = 32 s (31.25 khz) 12345678 12345678 group dimming signal resulting brightness + group dimming signal 256 256 125 ns = 8.19 ms (122 hz) 002aaf935 pca9952_PCA9955 all information provided in this document is subject to legal disclaimers. ? nxp semiconductors n.v. 2015. all ri ghts reserved. product data sheet rev. 7.1 ? 29 june 2015 26 of 48 nxp semiconductors pca9952; PCA9955 16-channel fm+ i 2 c-bus 57 ma constant current led driver 8. characteristics of the i 2 c-bus the i 2 c-bus is for 2-way, 2-line communication between different ics or modules. the two lines are a serial data line (sda) and a serial clock line (scl). both lines must be connected to a positive supply via a pull-up re sistor when connected to the output stages of a device. data transfer may be initiated only when the bus is not busy. 8.1 bit transfer one data bit is transferred during each clock pulse. the data on the sda line must remain stable during the high period of the clock pulse as changes in the data line at this time will be interpreted as control signals (see figure 10 ). 8.1.1 start and stop conditions both data and clock lines remain high when the bus is not busy. a high-to-low transition of the data line while the clock is hi gh is defined as the start condition (s). a low-to-high transition of the data line while the clock is high is defined as the stop condition (p) (see figure 11 ). 8.2 system configuration a device generating a message is a ?transmitter ?; a device receiving is the ?receiver?. the device that controls the message is the ?master? and the devices which are controlled by the master are the ?slaves? (see figure 12 ). fig 10. bit transfer mba607 data line stable; data valid change of data allowed sda scl fig 11. definition of start and stop conditions mba608 sda scl p stop condition s start condition pca9952_PCA9955 all information provided in this document is subject to legal disclaimers. ? nxp semiconductors n.v. 2015. all ri ghts reserved. product data sheet rev. 7.1 ? 29 june 2015 27 of 48 nxp semiconductors pca9952; PCA9955 16-channel fm+ i 2 c-bus 57 ma constant current led driver 8.3 acknowledge the number of data bytes transferred betwe en the start and the stop conditions from transmitter to receiver is not limited. ea ch byte of eight bits is followed by one acknowledge bit. the acknowledge bit is a high level put on the bus by the transmitter, whereas the master generates an extra acknowledge related clock pulse. a slave receiver which is addressed must gen erate an acknowledge af ter the reception of each byte. also a master must generate an acknowledge after the reception of each byte that has been clocked out of the slave transm itter. the device that acknowledges has to pull down the sda line during the acknowledge clock pulse, so that the sda line is stable low during the high period of the acknowledge related clock pulse; set-up time and hold time must be taken into account. a master receiver must signal an end of da ta to the transmitter by not generating an acknowledge on the last byte that has been cloc ked out of the slave. in this event, the transmitter must leave the data line high to enable the master to generate a stop condition. fig 12. system configuration 002aaa966 master transmitter/ receiver slave receiver slave transmitter/ receiver master transmitter master transmitter/ receiver sda scl i 2 c-bus multiplexer slave fig 13. acknowledgement on the i 2 c-bus 002aaa987 s start condition 9 8 2 1 clock pulse for acknowledgement not acknowledge acknowledge data output by transmitter data output by receiver scl from master pca9952_PCA9955 all information provided in this document is subject to legal disclaimers. ? nxp semiconductors n.v. 2015. all ri ghts reserved. product data sheet rev. 7.1 ? 29 june 2015 28 of 48 nxp semiconductors pca9952; PCA9955 16-channel fm+ i 2 c-bus 57 ma constant current led driver 9. bus transactions (1) slave address shown for PCA9955. (2) see table 6 for register definition. fig 14. write to a specific register 1 0 a3 a2 a1 a0 0 a s 1 slave address (1) start condition r/w acknowledge from slave 002aae918 data for register d[7:0] (2) d6 d5 d4 d3 d2 d1 d0 x control register auto-increment flag a acknowledge from slave a acknowledge from slave p stop condition (1) slave address shown for PCA9955. (2) ai1, ai0 = 00. see table 5 for auto-increment options. remark: care should be taken to load the appropriate value here in the ai1 and ai0 bits of the mode1 register for programming the part with the required auto-increment options. fig 15. write to all registers using the auto-increment feature 1 0 a3 a2 a1 a0 0 a s 1 slave address (1) start condition r/w acknowledge from slave 002aae919 mode1 register data (2) 0 0 0 0 0 0 0 1 control register auto-increment on a acknowledge from slave a acknowledge from slave p stop condition (cont.) (cont.) mode1 register selection mode2 register data a acknowledge from slave allcalladr register data a acknowledge from slave xxxxxxxxxxxxxxxxxxxxx xxxxxxxxxxxxxxxxxxxxxxxxxx xxxxxxx x x x xxxxxxxxxxxxxxxxxxxxxxxxxxxxxx xxxxxxxxxxxxxxxxxxx xx xx xxxxx xxxxxxxxxxxxxxxxxxxxxxxxxxx xxxxxxxxxxxxxxxxxxx xxxxxx xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx xxxxxxxxxxxx x x xxxxxxxxxxxxxxxxxxxxx xxxxxxxxxxxxxxxxxxxxxxxxxxxxxx xxxxx xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx xxxxxxxx xxxxxxxxxxxxxxxxxxxxxxxxx xxxxxxxxxxxxxxxxxxxx xxx pca9952_PCA9955 all information provided in this document is subject to legal disclaimers. ? nxp semiconductors n.v. 2015. all ri ghts reserved. product data sheet rev. 7.1 ? 29 june 2015 29 of 48 nxp semiconductors pca9952; PCA9955 16-channel fm+ i 2 c-bus 57 ma constant current led driver this example assumes that aif + ai[1:0] = 101b. (1) slave address shown for PCA9955. fig 16. multiple writes to indivi dual brightness registers only using the auto-increment feature 1 0 a3 a2 a1 a0 0 a s 1 slave address (1) start condition r/w acknowledge from slave 002aae920 pwm0 register data 0 0 0 1 0 1 0 1 control register auto-increment on a acknowledge from slave a acknowledge from slave p stop condition (cont.) (cont.) pwm0 register selection pwm1 register data a acknowledge from slave pwm14 register data a acknowledge from slave pwm15 register data a acknowledge from slave pwm0 register data a acknowledge from slave register rollover pwm14 register data a acknowledge from slave pwm15 register data a acknowledge from slave pca9952_PCA9955 all information provided in this document is subject to legal disclaimers. ? nxp semiconductors n.v. 2015. all ri ghts reserved. product data sheet rev. 7.1 ? 29 june 2015 30 of 48 nxp semiconductors pca9952; PCA9955 16-channel fm+ i 2 c-bus 57 ma constant current led driver this example assumes that the mode1[5] = 0 and mode1[6] = 0. (1) slave address shown for PCA9955. fig 17. read all registers using the auto-increment feature 1 0 a3 a2 a1 a0 0 a s 1 slave address (1) start condition r/w acknowledge from slave 002aae921 0 0 0 0 0 0 0 1 control register auto-increment on a acknowledge from slave (cont.) (cont.) mode1 register selection data from mode1 register a acknowledge from master sr restart condition 1 0 a3 a2 a1 a0 1 a 1 slave address (1) r/w acknowledge from slave data from mode2 register a acknowledge from master data from ledout0 a acknowledge from master data from eflag1 register a acknowledge from master data from mode1 register a acknowledge from master (cont.) (cont.) data from last read byte a not acknowledge from master p stop condition remark: a read operation can be done without doing a write operation befor e it. in this case, the data sent out is from the register pointed to by the control register (written to during the last write operation) with the auto-increment options in the mode1 register (written to during the last write operation). (1) slave address shown for PCA9955. fig 18. read of registers 1 0 a3 a2 a1 a0 1 a s 1 slave address (1) start condition r/w 002aae922 data from register a acknowledge from master data from register a no acknowledge from master data from register acknowledge from slave p stop condition pca9952_PCA9955 all information provided in this document is subject to legal disclaimers. ? nxp semiconductors n.v. 2015. all ri ghts reserved. product data sheet rev. 7.1 ? 29 june 2015 31 of 48 nxp semiconductors pca9952; PCA9955 16-channel fm+ i 2 c-bus 57 ma constant current led driver (1) slave address shown for PCA9955. (2) in this example, several PCA9955s are used and the same sequence (a) (above) is sent to each of them. (3) allcall bit in mode1 register is pr eviously set to 1 for this example. (4) och bit in mode2 register is prev iously set to 1 for this example. fig 19. led all call i 2 c-bus address programming and led all call sequence example 1 0 a3 a2 a1 a0 0 a s 1 slave address (1)(2) start condition r/w acknowledge from slave 002aae923 0 1 1 1 1 1 0 1 control register auto-increment on a acknowledge from slave allcalladr register selection 0 1 0 1 0 1 x 1 new led all call i 2 c address (3) p stop condition a acknowledge from slave 0 1 0 1 0 1 0 a s 1 led all call i 2 c address start condition r/w acknowledge from the 4 devices 0 0 0 0 0 1 0 1 control register a acknowledge from the 4 devices ledout0 register selection 1 0 1 0 1 0 1 0 ledout0 register (led fully on) p stop condition a the 16 leds are on at the acknowledge (4) sequence (a) sequence (b) (cont.) (cont.) 1 0 1 0 1 0 1 0 ledout1 register (led fully on) a the 16 leds are on at the acknowledge (4) 1 0 1 0 1 0 1 0 ledout2 register (led fully on) a the 16 leds are on at the acknowledge (4) acknowledge from the 4 devices acknowledge from the 4 devices acknowledge from the 4 devices 1 0 1 0 1 0 1 0 ledout3 register (led fully on) a the 16 leds are on at the acknowledge (4) acknowledge from the 4 devices auto-increment on pca9952_PCA9955 all information provided in this document is subject to legal disclaimers. ? nxp semiconductors n.v. 2015. all ri ghts reserved. product data sheet rev. 7.1 ? 29 june 2015 32 of 48 nxp semiconductors pca9952; PCA9955 16-channel fm+ i 2 c-bus 57 ma constant current led driver 10. application design-in information 10.1 thermal considerations since the pca9952/55 device integrates 16 linear current sources, thermal considerations should be taken into account to prevent overheating, which can cause the device to go into thermal shutdown. perhaps the major contributor for device?s overheating is the led forward voltage mismatch. this is because it can cause significant voltage differences between the led strings of the same type (e.g., 2 v to 3 v), wh ich ultimately translates into higher power dissipation in the device. the voltage drop ac ross the led channels of the device is given by the difference between the supply voltage and the led forward voltage of each led (1) a standard 10 k ? pull-up resistor is required to obtain the best system level esd performance. fig 20. typical application (PCA9955) PCA9955 led0 sda scl v dd = 3.3 v or 5.0 v i 2 c-bus/smbus master sda scl 1.6 k 1.6 k a0 a1 a2 v dd a3 v ss 002aae924 v ss reset reset rext iset up to 40 v led1 led2 led3 led4 led5 led6 led7 led8 led9 led10 led11 led12 led13 led14 led15 c 10 f 1.1 k (optional) 10 k (1) pca9952_PCA9955 all information provided in this document is subject to legal disclaimers. ? nxp semiconductors n.v. 2015. all ri ghts reserved. product data sheet rev. 7.1 ? 29 june 2015 33 of 48 nxp semiconductors pca9952; PCA9955 16-channel fm+ i 2 c-bus 57 ma constant current led driver string. reducing this to a minimum (e.g., 0. 8 v) helps to keep the power dissipation down. therefore leds binning is recommended to minimize led voltage forward variation and reduce power dissipation in the device. in order to en sure that the device will no t go into thermal shutdo wn when operating under certain application conditions, its junction temperature (t j ) should be calculated to ensure that is below the overtemperature threshold limit (125 ? c). the t j of the device depends on the ambient temperature (t amb ), device?s total power dissipation (p tot ), and thermal resistance. the device junction temperature can be calculated by using the following equation: (6) where: t j = junction temperature t amb = ambient temperature r th(j-a) = junction to ambient thermal resistance p tot = (device) total power dissipation an example of this calculation is show below: conditions: t amb = 50 ? c r th(j-a) = 31 ? c/w (per jedec 51 standard for multilayer pcb) i led = 50 ma / channel i dd(max) = 12 ma v dd = 5 v leds per channel = 10 leds / channel led v f(typ) = 3 v per led (30 v total for 10 leds in series) led v f mismatch = 0.2 v per led (2 v total for 10 leds in series) v reg(drv) = 0.8 v (this will be present only in t he led string with the highest led forward voltage.) v sup = led v f(typ) + led v f mismatch + v reg(drv) = 30 v + 2 v + 0.8 v = 32.8 v p tot calculation: p tot = ic_power + led drivers_power; ic_power = (i dd ? v dd ) + [(scl_v ol ? i ol ) + (sda_v ol ? i ol )] ic_power = (0.012 a ? 5v) + [(0.4v ? 0.03 a) + (0.4 v ? 0.03 a)] = 0.084 w led drivers_power = [(16 ? 1) ? (i led ) ? (led v f mismatch + v reg(drv) )] + (i led ? v reg(drv) ) led drivers_power = [15 ? 0.05 a ? (2 v + 0.8 v)] + (0.05 a ? 0.8 v) = 2.14 w p tot = 0.084 w + 2.14 w = 2.224 w t j t amb r th j - a ?? p tot ? += pca9952_PCA9955 all information provided in this document is subject to legal disclaimers. ? nxp semiconductors n.v. 2015. all ri ghts reserved. product data sheet rev. 7.1 ? 29 june 2015 34 of 48 nxp semiconductors pca9952; PCA9955 16-channel fm+ i 2 c-bus 57 ma constant current led driver t j calculation: t j = t amb + r th(j-a) ? p tot t j = 50 ? c + (31 ? c/w ? 2.224 w) = 118.94 ? c this confirms that the junction temperat ure is below the minimum overtemperature threshold of 125 ? c, which ensures the device will not go into thermal shutdown under these conditions. it is important to mention that the value of the thermal resistance junction-to-ambient (r th(j-a) ) strongly depends in the pcb design. th erefore, the thermal pad of the device should be attached to a big enough pcb copper area to ensure proper thermal dissipation (similar to jedec 51 standard). several thermal vias in the pcb thermal pad should be used as well to increase the effectiveness of the heat dissipation (e.g., 15 thermal vias). the thermal vias should be distribute d evenly in the pcb thermal pad. finally it is important to poin t out that this calculation should be taken as a reference only and therefore ev aluations should still be performed under the app lication environment and conditions to confirm proper system operation. 11. limiting values [1] class ii, level b for a1 (pin 3), a2 (pin 4). all other pins are class ii, level a ( ? 100 ma). 12. thermal characteristics [1] per jedec 51 standard for multilayer pcb. table 22. limiting values in accordance with the absolute ma ximum rating system (iec 60134). symbol parameter conditions min max unit v dd supply voltage ? 0.5 +6.0 v v i/o voltage on an input/output pin v ss ? 0.5 5.5 v v drv(led) led driver voltage v ss ? 0.5 40 v i o(ledn) output current on pin ledn - 65 ma i ss ground supply current - 1.0 a i lu latch-up current jesd [1] -9 0m a p tot total power dissipation t amb =25 ?c- 3 . 2 w t amb =85 ?c- 1 . 3 w t stg storage temperature ? 65 +150 ?c t amb ambient temperature operating pca9952tw, PCA9955tw ? 20 +85 ?c pca9952tw/q900, PCA9955tw/q900 ? 40 +85 ?c t j junction temperature ? 20 +125 ?c table 23. thermal characteristics symbol parameter conditions typ unit r th(j-a) thermal resistance from junction to ambient htssop28 [1] 31 ?c/w pca9952_PCA9955 all information provided in this document is subject to legal disclaimers. ? nxp semiconductors n.v. 2015. all ri ghts reserved. product data sheet rev. 7.1 ? 29 june 2015 35 of 48 nxp semiconductors pca9952; PCA9955 16-channel fm+ i 2 c-bus 57 ma constant current led driver 13. static characteristics table 24. static characteristics v dd = 3 v to 5.5 v; v ss =0v; t amb = ? 20 ? cto+85 ? c (pca9952tw, PCA9955tw); t amb = ? 40 ? cto+85 ? c (pca9952tw/q900, PCA9955tw/q900 ); unless otherwise specified. symbol parameter conditions min typ max unit supply v dd supply voltage 3 - 5.5 v i dd supply current on pin v dd ; operating mode; no load; f scl =1mhz v dd =3.3v - 6.5 14 ma v dd =5.5v - 7.0 15 ma i dd supply current r ext = open; led[15:0] = off - 0.7 14 ma r ext =2k ? ; led[15:0] = off - 2 14 ma r ext =1k ? ; led[15:0] = off - 3 15 ma r ext =2k ? ; led[15:0] = on - 2 15 ma r ext =1k ? ; led[15:0] = on - 3 16 ma i stb standby current on pin v dd ; no load; f scl =0hz; mode1[4] = 1; v i =v dd v dd = 3.3 v - 100 600 ? a v dd = 5.5 v - 100 700 ? a v por power-on reset voltage no load; v i =v dd or v ss - 2.65 2.8 v v pdr power-down reset voltage no load; v i =v dd or v ss [1] 0.8 1.25 - v input scl; input/output sda v il low-level input voltage ? 0.5 - +0.3v dd v v ih high-level input voltage 0.7v dd -5.5v i ol low-level output current v ol =0.4v; v dd =3v 20 - - ma v ol =0.4v; v dd =5.0v 30 - - ma i l leakage current v i =v dd or v ss ? 1- +1 ? a c i input capacitance v i =v ss - 6 10 pf current controlled outputs (led[15:0]) i o output current v o = 0.8 v; irefx = ffh r ext =1k ? 52 57.5 62 ma r ext =2k ? 25.5 28.5 31.5 ma ? i o output current variation v o = 0.8 v; irefx = ffh between bits (different ics, same channel); r ext =1k ? - ? 2.5 ? 8% between bits (2 channels, same ic); r ext =2k ? - ? 1.7 ? 5.8 % v reg(drv) driver regulation voltage minimum regulation voltage; irefx = ffh; r ext =1k ? 0.8 1.0 40 v i l(off) off-state leakage current v o =40v ? 1.0 - +1 ? a v th(l) low-level threshold voltage open led protection; error flag will trip during verification test if v o ? v th(l) -0.35- v pca9952_PCA9955 all information provided in this document is subject to legal disclaimers. ? nxp semiconductors n.v. 2015. all ri ghts reserved. product data sheet rev. 7.1 ? 29 june 2015 36 of 48 nxp semiconductors pca9952; PCA9955 16-channel fm+ i 2 c-bus 57 ma constant current led driver [1] v dd must be lowered to 0.8 v in order to reset part. 14. dynamic characteristics v th(h) high-level threshold voltage short led protection; error flag will trip during verification test if v o ? v th(h) -2.5- v address inputs, oe input (pca9952 only), reset input v il low-level input voltage ? 0.5 - +0.3v dd v v ih high-level input voltage 0.7v dd -5.5v i li input leakage current ? 1- +1 ? a c i input capacitance - 3.7 5 pf overtemperature protection t th(otp) overtemperature protection threshold temperature rising 125 145 160 ?c hysteresis - 20 - ?c table 24. static characteristics ?continued v dd = 3 v to 5.5 v; v ss =0v; t amb = ? 20 ? cto+85 ? c (pca9952tw, PCA9955tw); t amb = ? 40 ? cto+85 ? c (pca9952tw/q900, PCA9955tw/q900 ); unless otherwise specified. symbol parameter conditions min typ max unit table 25. dynamic characteristics symbol parameter conditions standard-mode i 2 c-bus fast-mode i 2 c-bus fast-mode plus i 2 c-bus unit min max min max min max f scl scl clock frequency 0 100 0 400 0 1000 khz t buf bus free time between a stop and start condition 4.7 - 1.3 - 0.5 - ? s t hd;sta hold time (repeated) start condition 4.0 - 0.6 - 0.26 - ? s t su;sta set-up time for a repeated start condition 4.7 - 0.6 - 0.26 - ? s t su;sto set-up time for stop condition 4.0 - 0.6 - 0.26 - ? s t hd;dat data hold time 0 - 0 - 0 - ns t vd;ack data valid acknowledge time [1] 0.3 3.45 0.1 0.9 0.05 0.45 ? s t vd;dat data valid time [2] 0.3 3.45 0.1 0.9 0.05 0.45 ? s t su;dat data set-up time 250 - 100 - 50 - ns t low low period of the scl clock 4.7 - 1.3 - 0.5 - ? s t high high period of the scl clock 4.0 - 0.6 - 0.26 - ? s t f fall time of both sda and scl signals [3] [4] -30020+0.1c b [5] 300 - 120 ns t r rise time of both sda and scl signals - 1000 20 + 0.1c b [5] 300 - 120 ns t sp pulse width of spikes that must be suppressed by the input filter [6] -50 - 50-50ns pca9952_PCA9955 all information provided in this document is subject to legal disclaimers. ? nxp semiconductors n.v. 2015. all ri ghts reserved. product data sheet rev. 7.1 ? 29 june 2015 37 of 48 nxp semiconductors pca9952; PCA9955 16-channel fm+ i 2 c-bus 57 ma constant current led driver [1] t vd;ack = time for acknowledgement signal from scl low to sda (out) low. [2] t vd;dat = minimum time for sda data out to be valid following scl low. [3] a master device must internally provide a hold time of at least 300 ns for the sda signal (refer to the v il of the scl signal) in order to bridge the undefined region of scl?s falling edge. [4] the maximum t f for the sda and scl bus lines is specif ied at 300 ns. the maximum fall time (t f ) for the sda output stage is specified at 250 ns. this allows series protection resi stors to be connected between the sda and the scl pins and the sda/scl bus lines without exceeding the maximum specified t f . [5] c b = total capacitance of one bus line in pf. [6] input filters on the sda and scl inputs suppress noise spikes less than 50 ns. [7] load resistor (r l ) for ledn is 100 ? pull-up to v dd . t w(rst) reset pulse width 2.5 - 2.5 - 2.5 - ? s t plh low to high propagation delay oe to ledn disable [7] - 1.2 - 1.2 - 1.2 ? s t phl high to low propagation delay oe to ledn enable [7] - 1.2 - 1.2 - 1.2 ? s table 25. dynamic characteristics ?continued symbol parameter conditions standard-mode i 2 c-bus fast-mode i 2 c-bus fast-mode plus i 2 c-bus unit min max min max min max fig 21. definition of timing t sp t buf t hd;sta p p s t low t r t hd;dat t f t high t su;dat t su;sta sr t hd;sta t su;sto sda scl 002aaa986 0.7 v dd 0.3 v dd 0.7 v dd 0.3 v dd pca9952_PCA9955 all information provided in this document is subject to legal disclaimers. ? nxp semiconductors n.v. 2015. all ri ghts reserved. product data sheet rev. 7.1 ? 29 june 2015 38 of 48 nxp semiconductors pca9952; PCA9955 16-channel fm+ i 2 c-bus 57 ma constant current led driver 15. test information rise and fall times refer to v il and v ih . fig 22. i 2 c-bus timing diagram scl sda t hd;sta t su;dat t hd;dat t f t buf t su;sta t low t high t vd;ack 002aab285 t su;sto protocol start condition (s) bit 7 msb (a7) bit 6 (a6) bit 1 (d1) bit 0 (d0) 1 / f scl t r t vd;dat acknowledge (a) stop condition (p) 0.3 v dd 0.7 v dd 0.3 v dd 0.7 v dd fig 23. output propagation delay 002aag604 oe t plh output data t phl r l = load resistor for ledn. r l for sda = 165 ? (30 ma or less current). c l = load capacitance includes jig and probe capacitance. r t = termination resistance should be equal to the output impedance z o of the pulse generators. fig 24. test circuitry for switching times pulse generator v o c l 50 pf r l 50 002aag289 r t v i v dd dut v led open v ss pca9952_PCA9955 all information provided in this document is subject to legal disclaimers. ? nxp semiconductors n.v. 2015. all ri ghts reserved. product data sheet rev. 7.1 ? 29 june 2015 39 of 48 nxp semiconductors pca9952; PCA9955 16-channel fm+ i 2 c-bus 57 ma constant current led driver 16. package outline fig 25. package outline sot1172-2 (htssop28) references outline version european projection issue date iec jedec jeita sot1172-2 - - - mo-153 - - - sot1172-2_po unit mm max nom min 1.1 0.15 0.10 0.05 0.25 0.30 0.22 0.19 9.8 9.7 9.6 5.6 5.5 5.4 a dimensions note 1. plastic or metal protrusions of 0.15 mm maximum per side are not included. 2. plastic interlead protrusions of 0.25 mm maximum per side are not included. htssop28: plastic thermal enhanced thin shrink small outline package; 28 leads; body width 4.4 mm; lead pitch 0.65 mm; exposed die pad sot1172-2 a 1 a 2 0.95 0.90 0.85 a 3 b p 0.75 0.62 0.50 0.40 0.37 0.3 0.2 l p qv c 0.20 0.15 0.10 d (1) d h e (2) 4.5 4.4 4.3 e h 2.3 2.2 2.1 e 0.65 1.0 6.6 6.4 6.2 h e l 0.1 0.80 0.63 0.50 8 4 0 yz 0.13 w 0 2.5 5 mm scale y exposed die pad side d d h z b p w e h e pin 1 index 14 1 28 15 detail x q a a 3 a 1 a 2 l p l c x h e va e a 10-07-06 10-07-13 pca9952_PCA9955 all information provided in this document is subject to legal disclaimers. ? nxp semiconductors n.v. 2015. all ri ghts reserved. product data sheet rev. 7.1 ? 29 june 2015 40 of 48 nxp semiconductors pca9952; PCA9955 16-channel fm+ i 2 c-bus 57 ma constant current led driver 17. handling information all input and output pins are protected ag ainst electrostatic discharge (esd) under normal handling. when handling ensure that the appropriate precautions are taken as described in jesd625-a or equivalent standards. 18. soldering of smd packages this text provides a very brief insight into a complex technology. a more in-depth account of soldering ics can be found in application note an10365 ?surface mount reflow soldering description? . 18.1 introduction to soldering soldering is one of the most common methods through which packages are attached to printed circuit boards (pcbs), to form electr ical circuits. the soldered joint provides both the mechanical and the electrical connection. th ere is no single sold ering method that is ideal for all ic packages. wave soldering is often preferred when through-hole and surface mount devices (smds) are mixed on one printed wiring board; however, it is not suitable for fine pitch smds. reflow soldering is ideal for the small pitches and high densities that come with increased miniaturization. 18.2 wave and reflow soldering wave soldering is a joining technology in which the joints are made by solder coming from a standing wave of liquid solder. the wave soldering process is suitable for the following: ? through-hole components ? leaded or leadless smds, which are glued to the surface of the printed circuit board not all smds can be wave soldered. packages with solder balls, and some leadless packages which have solder lands underneath the body, cannot be wave soldered. also, leaded smds with leads having a pitch smaller than ~0.6 mm cannot be wave soldered, due to an increased pr obability of bridging. the reflow soldering process involves applying solder paste to a board, followed by component placement and exposure to a temperature profile. leaded packages, packages with solder balls, and leadless packages are all reflow solderable. key characteristics in both wave and reflow soldering are: ? board specifications, in cluding the board finish , solder masks and vias ? package footprints, including solder thieves and orientation ? the moisture sensitivit y level of the packages ? package placement ? inspection and repair ? lead-free soldering versus snpb soldering 18.3 wave soldering key characteristics in wave soldering are: pca9952_PCA9955 all information provided in this document is subject to legal disclaimers. ? nxp semiconductors n.v. 2015. all ri ghts reserved. product data sheet rev. 7.1 ? 29 june 2015 41 of 48 nxp semiconductors pca9952; PCA9955 16-channel fm+ i 2 c-bus 57 ma constant current led driver ? process issues, such as application of adhe sive and flux, clinching of leads, board transport, the solder wave parameters, and the time during which components are exposed to the wave ? solder bath specifications, including temperature and impurities 18.4 reflow soldering key characteristics in reflow soldering are: ? lead-free versus snpb solderi ng; note that a lead-free reflow process usually leads to higher minimum peak temperatures (see figure 26 ) than a snpb process, thus reducing the process window ? solder paste printing issues including smearing, release, and adjusting the process window for a mix of large and small components on one board ? reflow temperature profile; this profile includ es preheat, reflow (in which the board is heated to the peak temperature) and cooling down. it is imperative that the peak temperature is high enough for the solder to make reliable solder joints (a solder paste characteristic). in addition, the peak temperature must be low enough that the packages and/or boards are not damaged. the peak temperature of the package depends on package thickness and volume and is classified in accordance with ta b l e 2 6 and 27 moisture sensitivity precautions, as indicat ed on the packing, must be respected at all times. studies have shown that small packages reach higher temperatures during reflow soldering, see figure 26 . table 26. snpb eutectic process (from j-std-020d) package thickness (mm) package reflow temperature ( ?c) volume (mm 3 ) < 350 ? 350 < 2.5 235 220 ? 2.5 220 220 table 27. lead-free process (from j-std-020d) package thickness (mm) package reflow temperature ( ?c) volume (mm 3 ) < 350 350 to 2000 > 2000 < 1.6 260 260 260 1.6 to 2.5 260 250 245 > 2.5 250 245 245 pca9952_PCA9955 all information provided in this document is subject to legal disclaimers. ? nxp semiconductors n.v. 2015. all ri ghts reserved. product data sheet rev. 7.1 ? 29 june 2015 42 of 48 nxp semiconductors pca9952; PCA9955 16-channel fm+ i 2 c-bus 57 ma constant current led driver for further information on temperature profiles, refer to application note an10365 ?surface mount reflow soldering description? . msl: moisture sensitivity level fig 26. temperature profiles for large and small components 001aac844 temperature time minimum peak temperature = minimum soldering temperature maximum peak temperature = msl limit, damage level peak temperature pca9952_PCA9955 all information provided in this document is subject to legal disclaimers. ? nxp semiconductors n.v. 2015. all ri ghts reserved. product data sheet rev. 7.1 ? 29 june 2015 43 of 48 nxp semiconductors pca9952; PCA9955 16-channel fm+ i 2 c-bus 57 ma constant current led driver 19. soldering: pcb footprints fig 27. pcb footprint for sot1172-2 (htssop28); re flow soldering ' , 0 ( 1 6 , 2 1 6 l q p p $ \ % \ ' ' * \ + \ 3 & * [ + [ 6 2 7 ) r r w s u l q w l q i r u p d w l r q i r u u h i o r z v r o g h u l q j r i + 7 6 6 2 3 s d f n d j h 3 6 / \ q 6 3 \ q 6 3 [ 6 3 6 \ 6 3 6 [ 6 / [ 6 3 [ w r w 6 3 \ w r w 6 3 [ 6 3 \ r f f x s l h g d u h d v r o g h u o d q g s o x v v r o g h u s d v w h v r o g h u o d q g v r w b i u , v v x h g d w h * \ $ \ & 6 / \ 6 3 \ w r w % \ + \ 3 6 / [ ' ' [ 6 3 \ 6 3 [ q 6 3 [ 6 3 [ w r w 6 3 6 [ 3 * [ + [ 6 3 6 \ q 6 3 \ * h q h u l f i r r w s u l q w s d w w h u q 5 h i h u w r w k h s d f n d j h r x w o l q h g u d z l q j i r u d f w x d o o d \ r x w pca9952_PCA9955 all information provided in this document is subject to legal disclaimers. ? nxp semiconductors n.v. 2015. all ri ghts reserved. product data sheet rev. 7.1 ? 29 june 2015 44 of 48 nxp semiconductors pca9952; PCA9955 16-channel fm+ i 2 c-bus 57 ma constant current led driver 20. abbreviations 21. references [1] an10897, ?a guide to designing for esd and emc? ? nxp semiconductors [2] an11131, ?how to improve system level esd performance? ? nxp semiconductors table 28. abbreviations acronym description ack acknowledge cdm charged-device model dac digital-to-analog converter dut device under test emi electromagnet ic interference esd electrostatic discharge hbm human body model i 2 c-bus inter-integrated circuit bus led light emitting diode lsb least significant bit msb most significant bit pcb printed-circuit board pwm pulse width modulation rgb red/green/blue rgba red/green/blue/amber smbus system management bus pca9952_PCA9955 all information provided in this document is subject to legal disclaimers. ? nxp semiconductors n.v. 2015. all ri ghts reserved. product data sheet rev. 7.1 ? 29 june 2015 45 of 48 nxp semiconductors pca9952; PCA9955 16-channel fm+ i 2 c-bus 57 ma constant current led driver 22. revision history table 29. revision history document id release date data sheet status change notice supersedes pca9952_PCA9955 v.7.1 20150629 product data sheet - pca9952_PCA9955 v.7 modifications: ? section 7.3.3 ? ledout0 to ledout3, le d driver output state ? : added remark. ? table 7 ? mode1 - mode register 1 (address 00h) bit description ? : added ta b l e note [3] . pca9952_PCA9955 v.7 20130527 product data sheet - pca9952_PCA9955 v.6 pca9952q900_PCA9955q900 v.1 modifications: ? section 2 ? features and benefits ? : ? bullet item for operating temperature re-written to indicate different temperature ranges for pca9952/55 and pca9952/55/q900 ? bullet item for esd protection re-written to indicate different cdm voltages for pca9952/55 and pca9952/55/q900 ? section 3 ? applications ? : added (new) seventh bullet item ? table 1 ? ordering information ? : added type numbers pca9952tw/q900 and PCA9955tw/q900 ? table 2 ? ordering options ? : added type numbers pca9952tw/q900 and PCA9955tw/q900 ? figure 2 ? pin configuration for htssop28 ? : added type numbers pca9952tw/q900 and PCA9955tw/q900 ? table 22 ? limiting values ? : added ambient temperature range for type numbers pca9952tw/q900 and PCA9955tw/q900 ? table 24 ? static characteristics ? : ? appended ?(pca9952tw, PCA9955tw)? to phrase ?t amb = ? 20 ? cto+85?c? in descriptive line below table title ? added phrase ?t amb = ? 40 ? cto+85 ? c (pca9952tw/q900, PCA9955tw/q900)? to descriptive line below table title pca9952q900_PCA9955q900 v.1 20130426 product data sheet - - pca9952_PCA9955 v.6 20130422 product data sheet - pca9952_PCA9955 v.5 pca9952_PCA9955 v.5 20121001 product data sheet - pca9952_PCA9955 v.4 pca9952_PCA9955 v.4 20120813 product data sheet - pca9952_PCA9955 v.3 pca9952_PCA9955 v.3 20120418 product data sheet - pca9952_PCA9955 v.2 pca9952_PCA9955 v.2 20120312 product data sheet - pca9952_PCA9955 v.1 pca9952_PCA9955 v.1 20111202 product data sheet - - pca9952_PCA9955 all information provided in this document is subject to legal disclaimers. ? nxp semiconductors n.v. 2015. all ri ghts reserved. product data sheet rev. 7.1 ? 29 june 2015 46 of 48 nxp semiconductors pca9952; PCA9955 16-channel fm+ i 2 c-bus 57 ma constant current led driver 23. legal information 23.1 data sheet status [1] please consult the most recently issued document before initiating or completing a design. [2] the term ?short data sheet? is explained in section ?definitions?. [3] the product status of device(s) described in this document may have changed since this document was published and may differ in case of multiple device s. the latest product status information is available on the internet at url http://www.nxp.com . 23.2 definitions draft ? the document is a draft versi on only. the content is still under internal review and subject to formal approval, which may result in modifications or additions. nxp semiconductors does not give any representations or warranties as to the accuracy or completeness of information included herein and shall hav e no liability for the consequences of use of such information. short data sheet ? a short data sheet is an extract from a full data sheet with the same product type number(s) and title. a short data sheet is intended for quick reference only and should not be relied upon to contain detailed and full information. for detailed and full information see the relevant full data sheet, which is available on request vi a the local nxp semiconductors sales office. in case of any inconsistency or conflict with the short data sheet, the full data sheet shall prevail. product specification ? the information and data provided in a product data sheet shall define the specification of the product as agreed between nxp semiconductors and its customer , unless nxp semiconductors and customer have explicitly agreed otherwis e in writing. in no event however, shall an agreement be valid in which the nxp semiconductors product is deemed to offer functions and qualities beyond those described in the product data sheet. 23.3 disclaimers limited warranty and liability ? information in this document is believed to be accurate and reliable. however, nxp semiconductors does not give any representations or warranties, expressed or implied, as to the accuracy or completeness of such information and shall have no liability for the consequences of use of such info rmation. nxp semiconductors takes no responsibility for the content in this document if provided by an information source outside of nxp semiconductors. in no event shall nxp semiconductors be liable for any indirect, incidental, punitive, special or consequential damages (including - without limitation - lost profits, lost savings, business interruption, costs related to the removal or replacement of any products or rework charges) whether or not such damages are based on tort (including negligence), warranty, breach of contract or any other legal theory. notwithstanding any damages that customer might incur for any reason whatsoever, nxp semiconductors? aggregate and cumulative liability towards customer for the products described herein shall be limited in accordance with the terms and conditions of commercial sale of nxp semiconductors. right to make changes ? nxp semiconductors reserves the right to make changes to information published in this document, including without limitation specifications and product descriptions, at any time and without notice. this document supersedes and replaces all information supplied prior to the publication hereof. suitability for use in automotive applications ? this nxp semiconductors product has been qualified for use in automotive applications. unless otherwise agreed in writing, the product is not designed, authorized or warranted to be suitable for use in life support, life-critical or safety-critical systems or equipment, nor in applications where failure or malfunction of an nxp semiconductors product can reasonably be expected to result in personal injury, death or severe property or environmental damage. nxp semiconductors and its suppliers accept no liability for inclusion and/or use of nxp semiconducto rs products in such equipment or applications and therefore such inclusion and/or use is at the customer's own risk. applications ? applications that are described herein for any of these products are for illustrative purpos es only. nxp semiconductors makes no representation or warranty that such applications will be suitable for the specified use without further testing or modification. customers are responsible for the design and operation of their applications and products using nxp semiconductors products, and nxp semiconductors accepts no liability for any assistance with applications or customer product design. it is customer?s sole responsibility to determine whether the nxp semiconductors product is suitable and fit for the customer?s applications and products planned, as well as fo r the planned application and use of customer?s third party customer(s). customers should provide appropriate design and operating safeguards to minimize the risks associated with their applications and products. nxp semiconductors does not accept any liability related to any default, damage, costs or problem which is based on any weakness or default in the customer?s applications or products, or the application or use by customer?s third party customer(s). customer is responsible for doing all necessary testing for the customer?s applic ations and products using nxp semiconductors products in order to av oid a default of the applications and the products or of the application or use by customer?s third party customer(s). nxp does not accept any liability in this respect. limiting values ? stress above one or more limiting values (as defined in the absolute maximum ratings system of iec 60134) will cause permanent damage to the device. limiting values are stress ratings only and (proper) operation of the device at these or any other conditions above those given in the recommended operating conditions section (if present) or the characteristics sections of this document is not warranted. constant or repeated exposure to limiting values will permanently and irreversibly affect the quality and reliability of the device. terms and conditions of commercial sale ? nxp semiconductors products are sold subject to the gener al terms and conditions of commercial sale, as published at http://www.nxp.com/profile/terms , unless otherwise agreed in a valid written individual agreement. in case an individual agreement is concluded only the terms and conditions of the respective agreement shall apply. nxp semiconductors hereby expressly objects to applying the customer?s general terms and conditions with regard to the purchase of nxp semiconducto rs products by customer. document status [1] [2] product status [3] definition objective [short] data sheet development this document contains data from the objecti ve specification for product development. preliminary [short] data sheet qualification this document contains data from the preliminary specification. product [short] data sheet production this document contains the product specification. pca9952_PCA9955 all information provided in this document is subject to legal disclaimers. ? nxp semiconductors n.v. 2015. all ri ghts reserved. product data sheet rev. 7.1 ? 29 june 2015 47 of 48 nxp semiconductors pca9952; PCA9955 16-channel fm+ i 2 c-bus 57 ma constant current led driver no offer to sell or license ? nothing in this document may be interpreted or construed as an offer to sell products t hat is open for acceptance or the grant, conveyance or implication of any licens e under any copyrights, patents or other industrial or intellectual property rights. export control ? this document as well as the item(s) described herein may be subject to export control regu lations. export might require a prior authorization from competent authorities. translations ? a non-english (translated) version of a document is for reference only. the english version shall prevail in case of any discrepancy between the translated and english versions. 23.4 trademarks notice: all referenced brands, produc t names, service names and trademarks are the property of their respective owners. i 2 c-bus ? logo is a trademark of nxp semiconductors n.v. 24. contact information for more information, please visit: http://www.nxp.com for sales office addresses, please send an email to: salesaddresses@nxp.com nxp semiconductors pca9952; PCA9955 16-channel fm+ i 2 c-bus 57 ma constant current led driver ? nxp semiconductors n.v. 2015. all rights reserved. for more information, please visit: http://www.nxp.com for sales office addresses, please se nd an email to: salesaddresses@nxp.com date of release: 29 june 2015 document identifier: pca9952_PCA9955 please be aware that important notices concerning this document and the product(s) described herein, have been included in section ?legal information?. 25. contents 1 general description . . . . . . . . . . . . . . . . . . . . . . 1 2 features and benefits . . . . . . . . . . . . . . . . . . . . 2 3 applications . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 4 ordering information . . . . . . . . . . . . . . . . . . . . . 4 4.1 ordering options . . . . . . . . . . . . . . . . . . . . . . . . 4 5 block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . 5 6 pinning information . . . . . . . . . . . . . . . . . . . . . . 6 6.1 pinning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 6.2 pin description . . . . . . . . . . . . . . . . . . . . . . . . . 7 7 functional description . . . . . . . . . . . . . . . . . . . 9 7.1 device addresses . . . . . . . . . . . . . . . . . . . . . . . 9 7.1.1 regular i 2 c-bus slave address. . . . . . . . . . . . . 9 7.1.2 led all call i 2 c-bus address . . . . . . . . . . . . . . 9 7.1.3 led bit sub call i 2 c-bus addresses. . . . . . . . 10 7.2 control register . . . . . . . . . . . . . . . . . . . . . . . . 10 7.3 register definitions . . . . . . . . . . . . . . . . . . . . . 12 7.3.1 mode1 ? mode register 1 . . . . . . . . . . . . . . 14 7.3.2 mode2 ? mode register 2 . . . . . . . . . . . . . . 14 7.3.3 ledout0 to ledout 3, led driver output state . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 7.3.4 grppwm, group duty cycle control . . . . . . . . 15 7.3.5 grpfreq, group frequency . . . . . . . . . . . . . 16 7.3.6 pwm0 to pwm15, individual brightness control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 7.3.7 iref0 to iref15, ledn output current value registers . . . . . . . . . . . . . . . . . . . . . . . . 17 7.3.8 offset ? ledn output delay offset register 18 7.3.9 led bit sub call i 2 c-bus addresses for pca9952/55 . . . . . . . . . . . . . . . . . . . . . . . . . . 19 7.3.10 allcalladr, led all call i 2 c-bus address. 19 7.3.11 reserved1 . . . . . . . . . . . . . . . . . . . . . . . . . 19 7.3.12 reserved2, reserved3 . . . . . . . . . . . . . 19 7.3.13 pwmall ? brightness control for all ledn outputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 7.3.14 irefall register: output current value for all ledn outputs . . . . . . . . . . . . . . . . . . . . . . . 20 7.3.15 led driver constant current outputs . . . . . . . . 20 7.3.15.1 adjusting output peak current . . . . . . . . . . . . . 20 7.3.16 led error detection . . . . . . . . . . . . . . . . . . . . 22 7.3.16.1 open-circuit detection principle . . . . . . . . . . . 22 7.3.16.2 short-circuit detection principle. . . . . . . . . . . . 23 7.3.17 overtemper ature protection . . . . . . . . . . . . . . 23 7.4 active low output enable input . . . . . . . . . . . 23 7.5 power-on reset . . . . . . . . . . . . . . . . . . . . . . . . 24 7.6 hardware reset recovery . . . . . . . . . . . . . . . . 24 7.7 software reset. . . . . . . . . . . . . . . . . . . . . . . . . 24 7.8 individual brightness control with group dimming/blinking . . . . . . . . . . . . . . . . . . . . . . 25 8 characteristics of the i 2 c-bus . . . . . . . . . . . . 26 8.1 bit transfer . . . . . . . . . . . . . . . . . . . . . . . . . . . 26 8.1.1 start and stop conditions. . . . . . . . . . . . . 26 8.2 system configuration . . . . . . . . . . . . . . . . . . . 26 8.3 acknowledge . . . . . . . . . . . . . . . . . . . . . . . . . 27 9 bus transactions . . . . . . . . . . . . . . . . . . . . . . . 28 10 application design-in information. . . . . . . . . 32 10.1 thermal considerations . . . . . . . . . . . . . . . . . 32 11 limiting values . . . . . . . . . . . . . . . . . . . . . . . . 34 12 thermal characteristics . . . . . . . . . . . . . . . . . 34 13 static characteristics . . . . . . . . . . . . . . . . . . . 35 14 dynamic characteristics. . . . . . . . . . . . . . . . . 36 15 test information . . . . . . . . . . . . . . . . . . . . . . . 38 16 package outline. . . . . . . . . . . . . . . . . . . . . . . . 39 17 handling information . . . . . . . . . . . . . . . . . . . 40 18 soldering of smd packages . . . . . . . . . . . . . . 40 18.1 introduction to soldering. . . . . . . . . . . . . . . . . 40 18.2 wave and reflow soldering. . . . . . . . . . . . . . . 40 18.3 wave soldering . . . . . . . . . . . . . . . . . . . . . . . 40 18.4 reflow soldering . . . . . . . . . . . . . . . . . . . . . . 41 19 soldering: pcb footprints . . . . . . . . . . . . . . . 43 20 abbreviations . . . . . . . . . . . . . . . . . . . . . . . . . 44 21 references. . . . . . . . . . . . . . . . . . . . . . . . . . . . 44 22 revision history . . . . . . . . . . . . . . . . . . . . . . . 45 23 legal information . . . . . . . . . . . . . . . . . . . . . . 46 23.1 data sheet status . . . . . . . . . . . . . . . . . . . . . . 46 23.2 definitions . . . . . . . . . . . . . . . . . . . . . . . . . . . 46 23.3 disclaimers . . . . . . . . . . . . . . . . . . . . . . . . . . 46 23.4 trademarks . . . . . . . . . . . . . . . . . . . . . . . . . . 47 24 contact information . . . . . . . . . . . . . . . . . . . . 47 25 contents. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48 |
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