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atmel led drivers MSL3163 and msl3164 16-string white & rgb led drivers with adaptive power control, e2prom, and spi/i2c/smbus serial interface datasheet brief
2 atmel led drivers-MSL3163/msl3164 general description the atmel led drivers- MSL3163 and msl3164 compact, high-power led string drivers use internal current control mosfets to sink up to 100ma per string, with current accuracy and matching better than 3%. the MSL3163/4 drive 16 parallel strings of ten white leds each, for a total of 160 white leds per device. sixteen interconnected devices control up to 2560 white leds. atmel led drivers-MSL3163 and msl3164 16-string white & rgb led drivers with adaptive power control, e2prom, and spi/i2c/smbus serial interface the MSL3163/4 adaptively controls the dc-dc converters that power the led strings, using atmel's adaptive sourcepower technology. these efficiency optimizers minimize power use while maintaining led current accuracy. the msl3164 features a 20 mhz spi serial interface, and the MSL3163 offers a 1 mhz i 2 c serial interface. both interfaces support video frame-by-frame led string intensity control for up to 16 interconnected devices to allow active area dimming. the devices include an advanced pwm engine that easily synchronizes to a video signal, and per-string phase adjustment to reduce unwanted lcd artifacts such as motion blur. additionally, an on-chip e2prom allows the power-up defaults to be customized through the serial interface. a unique combination of peak current control and pulse width management offer simple full screen brightness control, versatile area dimming and a consistent white point. one external resistor provides the global peak reference current for all led strings, and global peak current fine-tuning is available through an 8-bit register. global string drive pulse width is adjusted with an 8-bit global intensity register, and individual string pulse width is modulated with 12-bit registers. the MSL3163/4 feature fault monitoring of open circuit, short circuit, loss of video sync and over temperature conditions, and provides a fault output to notify the system controller. detailed fault status and control are available through the serial interface. the MSL3163/4 are offered in a 6 x 6 x 0.75mm, 40-pin tqfn package and operate over the -40c to 85c temperature range. applications long life, efficient led backlighting for: ? televisions and desktop monitors ? medical and industrial instrumentation ? automotive audio-visual displays channel signs architectural lighting ordering information 16-channel led string drivers part interface package MSL3163bt i 2 c interface 40 pin, 6 x 6 x 0.75mm tqfn msl3164bt spi interface 40 pin, 6 x 6 x 0.75mm tqfn
3 atmel led drivers-MSL3163/msl3164 atmel led drivers-MSL3163 and msl3164 atmel led drivers-MSL3163 and msl3164 16-string white & rgb led drivers with adaptive power control, e2prom, and spi/i2c/smbus serial interface key features application circuit ? 12-bit pwm string dimming operates at 240hz ? fast serial interfaces support up to 16 devices per bus: - msl3164 20 mhz spi - MSL3163 1 mhz i 2 c ? 8-bit adaptive power correction maximizes efficiency of up to three string power supplies ? drives 16 parallel led strings of 10 white leds each for up to 2560 white leds per serial bus ? supports adaptive, real-time area dimming for highest dynamic range lcd tvs and monitors ? programmable string phase reduces motion blur ? global intensity control via serial interface ? 100ma peak, 60ma average led string current ? single resistor sets peak current for all led strings ? 3% current accuracy and current balance ? video frame (vsync) and line (hsync) sync inputs ? sync loss detectors optionally disable led strings ? multiple MSL3163/4s share string power supplies and automatically negotiate the optimum supply voltage ? e2prom allows customized power-on defaults ? less than 1a led string off-leakage current ? string open circuit and led short circuit fault detection ? individual fault detection enable for each string ? over-temperature shutoff protection ? broadcast write simplifies configuration ? -40c to +85c operating temperature range ?
4 atmel led drivers-MSL3163/msl3164 package pin-out figure 1. atmel led driver- MSL3163 pinout 40 pin tqfn figure 2 . atmel led driver- msl3164 pinout 40 pin tqfn fbo 2 fbi 1 fbo 1 n c vdd v i n e n i l e d g n d c g n d 4 0 3 9 3 8 3 7 3 6 3 5 3 4 3 3 3 2 3 1 fbi 2 1 3 0 ad1 fbo 3 2 2 9 sda fbi 3 3 2 8 test phi 4 2 7 scl g s c 5 2 6 ad0 p w m 6 2 5 f l t b str0 7 2 4 str1 5 str1 8 2 3 str1 4 str2 9 2 2 str1 3 str3 1 0 msl 3163 ( t o p v i e w ) 2 1 str1 2 1 1 1 2 1 3 1 4 1 5 1 6 1 7 1 8 1 9 2 0 str4 str5 str6 str7 c g n d g n d str8 str9 str1 0 str1 1 fbo 2 fbi 1 fbo 1 n c vdd v i n e n i l e d g n d csb 4 0 3 9 3 8 3 7 3 6 3 5 3 4 3 3 3 2 3 1 fbi 2 1 3 0 ad1 fbo 3 2 2 9 mos i fbi 3 3 2 8 m i s o phi 4 2 7 sck g s c 5 2 6 ad0 p w m 6 2 5 f l t b str0 7 2 4 str1 5 str1 8 2 3 str1 4 str2 9 2 2 str1 3 str3 1 0 msl 3164 ( t o p v i e w ) 2 1 str1 2 1 1 1 2 1 3 1 4 1 5 1 6 1 7 1 8 1 9 2 0 str4 str5 str6 str7 c g n d g n d str8 str9 str1 0 str1 1
5 atmel led drivers-MSL3163/msl3164 figure 3. package dimensions: 40 pin 6mm x 6mm x 0.75mm tqfn (0.5mm pin pitch) with exposed pad atmel led drivers-MSL3163 and msl3164 16-string white & rgb led drivers with adaptive power control, e2prom, and spi/i2c/smbus serial interface
6 atmel led drivers-MSL3163/msl3164 package pin description table 1. pin assignments pin pin name pin description MSL3163 msl3164 1 fbi2 fbi2 effciency optimizer input 2 connect fbi2 to fbo2 of the next device when chaining devices (figure 7). if unused connect fbi2 to gnd. 2 fbo3 fbo3 effciency optimizer output 3 connect fbo3 to the third power supplys feedback node or to fbi3 of the previous device when chaining devices (figure 7). if unused connect fbo3 to gnd. 3 fbi3 fbi3 effciency optimizer input 3 connect fbi3 to fbo3 of the next device when chaining devices (figure 7). if unused connect fbi3 to gnd. 4 phi phi phase synchronization input drive phi with an external signal from 40hz to 10khz to synchronize the MSL3163/4 clock. phi is typically the vsync signal input. 5 gsc gsc gate shift clock input drive gsc with the gate shift clock of the video signal, from 0 to 10mhz. gsc is typically the hsync signal input. 6 pwm pwm pwm input pwm allows direct external control of the brightness of all led strings. the pwm input may also be used as a gate signal for the output of the pwm. drive pwm with a pulse-width modulated signal with duty ratio ranging from 0% to 100% and frequency up to 5khz.whe n not confgured for use as an input pwm is high-impedance. 7 - 14, 17 - 24 str0 thru str15 str0 thru str15 led string current sink outputs connect the cathode of the nth strings bottom leds to strn. connect unused strn outputs to gnd. 15 cgnd cgnd connect to ground connect cgnd to gnd and to ep with short, wide traces. 16, 32 gnd gnd signal ground connect all gnds to system ground and to ep with short, wide traces. 25 fltb fltb fault indication output (active low) open drain output fltb sinks current to gnd whenever a fault condition is verifed. toggle en low or read the fault registers to clear fltb. once cleared, fltb reasserts if the fault conditions persist. 26,30 ad0, ad1 ad0, ad1 slave id selection inputs connect ad1 and ad0 to gnd through resistors to set the device address for the serial interface. 27 scl sck MSL3163: i2c serial clock input scl is the clock input for the i2c serial interface. msl3164: spi serial shift clock sck is the clock input for the spi interface. 28 test miso MSL3163: factory test i/o factory test. make no electrical connection to test. msl3164: master input slave output miso is the spi serial data output. 29 sda mosi MSL3163: i2c serial data i/o sda is the data i/o for the i2c serial interface. msl3164: master input slave output mosi is the spi serial data input. 31 gnd csb MSL3163: ground. connect gnd to system ground and to ep with short, wide traces. msl3164: chip select (active low) csb is the chip select input for spi transactions. csb is active low. 33 iled iled maximum led string current setting input connect a resistor from iled to gnd to set the full-scale led string current for all strings using i string = 762 / r iled . for example, connect a 12.7k? resistor to gnd to set a 60ma maximum sink current through each led string. 34 en en enable input (active high) drive en high to turn on the MSL3163/4, drive en low to turn off the MSL3163/4. for automatic startup connect en to vin. when en is low the entire device, including the serial interface, is turned off. driving en high initiates a boot load of the e 2 prom data into the control registers, simulating a cold start-up. 35 vin vin supply voltage input connect a 5v supply to vin. bypass vin to gnd with a 10f ceramic capacitor placed close to vin.
7 atmel led drivers-MSL3163/msl3164 pin pin name pin description MSL3163 msl3164 36 vdd vdd 2.5v internal ldo regulator output vdd powers internal logic. bypass vdd to gnd with a 4.7f ceramic capacitor placed close to vdd. 37 nc nc no connect leave nc unconnected. 38 fbo1 fbo1 effciency optimizer output 1 connect fbo1 to the frst power supplys feedback node or to fbi1 of the previous device when chaining devices (figure 7). if unused connect fbo1 to gnd. 39 fbi1 fbi1 effciency optimizer input 1 connect fbi1 to fbo1 of the next device when chaining devices (figure 7). if unused connect fbi1 to gnd. 40 fbo2 fbo2 effciency optimizer output 2 connect fbo2 to the second power supplys feedback node or to fbi2 of the previous device when chaining devices (figure 7). if unused connect fbo2 to gnd. ep ep ep exposed pad, power ground ep is the path that the string currents take to ground. ep also provides thermal relief for the die. provide large traces from ep back to the string power supplies. also connect ep to system ground, and to gnd using short, wide traces. absolute maximum ratings voltage (with respect to gnd, cgnd = ep = gnd) vin, en ........................................................................................................................................................................ -0.3v to +6v vdd ......................................................................................................................................................................... -0.3v to +2.75v MSL3163: sda, scl ............................................................................................................................................ -0.3v to +6v msl3164: miso, mosi, csb, sck ........................................................................................... -0.3v to (vin + 0.3v) fltb .............................................................................................................................................................................. -0.3v to +6v iled, ad0, ad1 ................................................................................................................................. -0.3v to (vdd + 0.3v) phi, gsc, pwm, fbo1, fbo2, fbo3, fbi1, fbi2, fbi3 ................................................. -0.3v to (vin + 0.3v) str0 thru str15 ............................................................................................................................................... -0.3v to +40v cgnd ....................................................................................................................................................................... -0.3v to +0.3v current (into pin) vin ............................................................................................................................................................................................... 50ma ep ........................................................................................................................................................................................... -1700ma str0 thru str15 ............................................................................................................................................................. 105ma all other pins ............................................................................................................................................................................ 20ma continuous power dissipation 40-pin 6mm x 6mm qfn (derate 37mw/c above t a = +70c) ..................................................... 2963mw ambient operating temperature range t a = t min to t max ............................................................... -40c to +85c junction temperature ......................................................................................................................................................... +125c storage temperature range ........................................................................................................................ -65c to +125c lead soldering temperature, 10s .................................................................................................................................. +300c atmel led drivers-MSL3163 and msl3164 16-string white & rgb led drivers with adaptive power control, e2prom, and spi/i2c/smbus serial interface
8 atmel led drivers-MSL3163/msl3164 electrical characteristics (typical application circuit, vin = 5v, t a = t min to t max , unless otherwise noted. typical values are at vin = 5v, t a = +25c). parameter symbol conditions and notes min typ max unit dc electrical characteristics vin operating supply voltage vin 4.75 5 5.5 v vin operating supply current i vin en = vin, sleep = 0, r iled = 12.7k, phi = 240hz, gsc = 983.04khz, powerctrl = 0x4f, istr = 0xff, oscctrl = 0x04, gscinten = 0, phiinten = 0, strnen = 1 pwmn = 0x7ff 18 28 ma pwmn = 0xfff 24 35 vin shutdown supply current i shdn en = gnd, sda, scl, ad0, ad1, pwm, phi and gsc = gnd 10 a vin sleep current i sleep en = 1, sleep = 1, sda, scl, ad0, ad1, pwm, phi and gsc = gnd or vdd 1.5 ma vdd regulation voltage vdd 2.4 2.5 2.6 v input high voltage: sda, scl, pwm, phi, gsc, mosi, csb v ih 0.7 x vdd v input low voltage: sda, scl, pwm, phi, gsc, mosi, csb v il 0.3 x vdd v input high voltage: en 1.22 v input low voltage: en 0.8 v output high voltage: phi, gsc, miso v oh i source = 5ma vin C 0.4 v output low voltage: phi, gsc, sda, miso, fltb v ol i sink = 5ma 0.4 v iled regulation voltage r iled = 12.7k 350 mv fbi feedback input current 0 365 a fbo feedback output current range v fbo vin C 0.5v 0 365 a fbo feedback output current step size 1.1 a fbi input disable threshold 50 mv str0 thru str15 sink current r iled = 12.7k, istr = 0xff, v strn = 1v 55 60 67 ma str0 thru str15 sink current maximum r iled = 7.68k, istr = 0xff (note 1) 100 ma str0 thru str15 current load regulation r iled = 12.7k; istr = 0xff, fldbken = 0, v strn = 1v to 5v 0.033 %/v str0 thru str15 current matching r iled = 12.7k, istr = 0x7f, v strn = 1v -5 5 % str0 thru str15 minimum headroom v str r iled = 12.7k; istr = 0xff 0.5 v str0 thru str15 short circuit fault detection threshold sc ref 3.5 v str0 thru str15 current slew rate current rising (note 2) 608 ma/s current falling (note 2) 10868 thermal shutdown temperature (note 2) 135 c
9 atmel led drivers-MSL3163/msl3164 parameter symbol conditions and notes min typ max unit i2c timing characteristics, MSL3163 scl clock frequency 1/t scl bus timeout disabled (note 3) 0 1 mhz bus timeout period t timeout oscctrl = 0x04 30 ms f osc = 16mhz to 23mhz 600,000 / f osc s stop to start condition bus free time t buf 0.5 s repeated start condition hold time t hd:sta 0.26 s repeated start condition setup time t su:sta 0.26 s stop condition setup time t su:stop 0.26 s sda data hold time t hd:dat 50 ns sda data valid acknowledge time t vd:ack (note 4) 0.05 0.45 s sda data valid time t vd:dat (note 5) 0.05 0.45 s sda data set-up time t su:dat 100 ns scl clock low period t low 0.5 s scl clock high period t high 0.26 s sda, scl fall time t f (note 6) (note 7) 120 ns sda, scl rise time t r 120 ns sda, scl input suppression filter period t sp (note 8) 50 ns parameter symbol conditions and notes min typ max unit ac electrical characteristics osc frequency f osc oscctrl = 0x04 18.15 20.00 21.88 mhz phi frequency f phi 0.04 1 0 khz phi lock 4 phi cycles gsc frequency f gsc 0 1 0 mhz pwm frequency f pwm 5 0 khz pwm duty cycle 0 100 % parameter symbol conditions and notes min typ max unit spi timing characteristics, msl3164 sck frequency 20 mhz csb falling edge to sck rising edge setup time t csb:sck(su) 100 ns atmel led drivers-MSL3163 and msl3164 16-string white & rgb led drivers with adaptive power control, e2prom, and spi/i2c/smbus serial interface
10 atmel led drivers-MSL3163/msl3164 parameter symbol conditions and notes min typ max unit sck falling edge to csb rising edge setup time t sck:csb(su) 50 ns mosi to falling edge of sck setup time t mosi(su) 16 ns sck falling edge to mosi setup time t mosi(hold) 20 ns mosi, csb, sck signal rise time t r(spi) 5.0 ns mosi, csb, sck signal fall time t f(spi) 5.0 ns csb falling edge to miso data valid t csb:miso(dv) 50 ns csb rising edge to miso high impedance t csb:miso(hiz) 50 ns sck rising edge to miso data valid t valid 25 80 ns note 1. subject to thermal dissipation characteristics of the device note 2. guaranteed by design, not production tested. note 3. minimum scl clock frequency is limited by the bus timeout feature, which resets the serial bus interface if either sda or scl i s held low for t timeout . disable bus timeout via the power control register 0x02[6]. note 4. t vd:ack = scl low to sda (out) low acknowledge time. note 5. t vd:dat = minimum sda output data-valid time following scl low transition. note 6. a master device must internally provide an sda hold time of at least 300ns to ensure an scl low state. note 7. the maximum sda and scl rise times is 300ns. the maximum sda fall time is 250ns. this allows series protection resistors to be connected between sda and scl inputs and the sda/scl bus lines without exceeding the maximum allowable rise time. note 8. MSL3163/4 includes input filters on sda, scl, ad0 and ad1 inputs that suppress noise less than 50ns.
11 atmel led drivers-MSL3163/msl3164 block diagram the block diagram for the atmel led drivers-MSL3163/4 is shown in figure 4. figure 4 . atmel led drivers-MSL3163/4 block diagram atmel led drivers-MSL3163 and msl3164 16-string white & rgb led drivers with adaptive power control, e2prom, and spi/i2c/smbus serial interface
12 atmel led drivers-MSL3163/msl3164 typical application circuit figure 5 . atmel led driver- msl3164 driving 160 white leds in 16 strings at 60ma per string. ? ? ?
13 atmel led drivers-MSL3163/msl3164 detailed description the MSL3163 and msl3164 are highly integrated, flexible multi-string led drivers with power supply control to maximize system efficiency. the drivers easily connect to a video subsystem. although optional, this offers a simple architecture for use in lcd tv backlight applications. up to 16 drivers easily connect together to drive large numbers of led strings in a system. the drivers provide multiple methods of controlling led brightness, through both peak current control and through pulse width control of the string drive signals. peak current control offers excellent color consistency, while pulse width control allows brightness management. an on-chip e 2 prom holds all the default control register values. at power-up the data in the e 2 prom automatically copy directly to the control registers, setting up the device for operation. the devices interface to a c via i 2 c (MSL3163) or spi (msl3164). the robust 1mhz i 2 c interface supports up to 16 devices on the bus. the 20mhz bus addressable spi interface supports up to 16 devices per chip select line. while typically the led drive pwm signal is internally generated, both drivers also accept an external direct-drive pwm signal and offer optional string drive phase spreading. with direct-drive pwm, a pulse width modulated signal applied to the pwm input sets the pwm duty and the frequency of the leds drive signal. with phase spreading enabled, a progressive 1/16 pwm-frame time delay per string helps reduce both the transient load on the led power supplies, and the power supply input capacitor size requirements. the pwm frequency of the drivers is either synchronized to an external signal applied to phi, or generated from the internal oscillator for stand-alone applications. typically the vsync signal from the video system is used for the phi input. the on-time of each string is individually programmed via the device registers, providing a peak resolution of 12-bits when using the on-chip pwm generator. the actual resolution of the pwm frequency depends upon on the ratio of the gsc frequency (typically provided by a systems hsync signal, but can be internally generated) to the phi frequency, because the on-time of a string is programmed as a 12-bit count of the number of gsc clock cycles. this count can be further scaled by an 8-bit global intensity value, when enabled. the gsc clock is also used to precisely set each strings phase delay so that it is synchronized relative to the video frame. the efficiency optimizers control a wide range of different architectures of external dc/dc and ac/dc converters. multiple drivers in a system communicate with each other in real time to select an optimized operating voltage for the leds. this allows design of the power supply for the worst case forward voltage (v f ) of the leds without worrying about excessive power dissipation issues. during the start-up sequence the MSL3163/4 automatically reduce the power supply voltage to the minimum voltage required to keep the leds in current regulation. the devices can be configured to periodically perform this optimization to compensate for changes of the leds forward voltage, and to assure continued optimum power savings. internal regulators and enable input the MSL3163/4 includes an internal linear regulator that operates from the 5v nominal input supply, vin, and provides an internal 2.5v supply, vdd, to power the low-voltage internal circuitry. bypass vdd (pin 36) to gnd with a 4.7 f capacitor. bypass vin (pin 35) to gnd with a 10f capacitor. the MSL3163/4 enable input, en, enables the device. drive en low to enter low power operation, which lowers quiescent current draw to less than 20 a . with en low the serial interface is ignored. drive en high to turn on the device. when en is driven high the contents of the e 2 prom are boot-loaded into the control registers, simulating a cold start-up. atmel led drivers-MSL3163 and msl3164 16-string white & rgb led drivers with adaptive power control, e2prom, and spi/i2c/smbus serial interface
14 atmel led drivers-MSL3163/msl3164 figure 6. fbon connects to the power supply voltage divider through a diode setting the led string current with r iled and istr the MSL3163/4 features 16 current sink outputs, rated at 40v, each designed to sink up to 100ma peak. limit average current to 60ma if the pcb copper around the MSL3163/4 is the only heat sink employed. the maximum string current, i iled , for all 16 led string inputs is set by a single external resistor, r iled , placed from iled to gnd, whose value is determined using: iled iled i r 762 = . for example, a full-scale led current of 60ma returns r iled = 12.7k . the current for all led strings is reduced from its full- scale value with 8-bit resolution using istr, the string current control register 0x0f.
15 atmel led drivers-MSL3163/msl3164 connecting the efficiency optimizer to an led string power supply and selecting resistors the MSL3163/4 are designed to control led string power supplies that use a voltage divider (r top and r bottom in figure 6) to set output voltage, and whose regulation feedback voltage is not more than 3.5v. the efficiency optimizer improves power efficiency by injecting a current of between 0a and 255a into the voltage divider of the external power supply, dynamically adjusting the power supplys output to the minimum voltage required by the led strings. to select the resistors first determine v out(min) and v out(max) , the minimum and maximum string supply voltage limits, using: v out(min) = ( v f (min) * [# ofleds ] ) + 0.5 , and v out(max) = ( v f (max) * [# ofleds ] ) + 0.5 , where v f(min) and v f(max) are the leds minimum and maximum forward voltage drops at the peak current set by r iled (page 10). for example, if the led data are v f(min) = 3.5v and v f(max) = 3.8v, and ten leds are used in a string, then the total minimum and maximum voltage drops across the leds are 35v and 38v. adding an allowance of 0.5v of for the string drive mosfet headroom brings v out(min) to 35.5v and v out(max) to 38.5v. do not to exceed the 40v maximum specification of the string drivers str1 thru str15. then determine r top using: ) ( ) ( ) ( max fbon min out max out top i v v r ? = , where i fbon(max) is the 255 a maximum output current of the efficiency optimizer outputs fbon (if cascading multiple MSL3163/4s determine i fbon(max) as shown in the next section). finally, determine r bottom using: r bottom = r top * v fb , v out(max) _ v fb , where v fb is the regulation feedback voltage of the power supply. place a diode (1n4148 or similar) between fbon and the supplys feedback node to protect the MSL3163/4 against current flow into fbon. using multiple atmel led drivers- MSL3163/4s to control a common power supply cascade multiple MSL3163/4 devices into a chain configuration, with the fbin of one device connected to the fbon of the next (figure 7). connect the first fbon to the power supply feedback resistor node through a diode, and the unused fbin inputs (and any unused fbon outputs) to gnd as close to the MSL3163/4 as possible. assign all strings powered by a common supply to the proper fbon output using string set registers (strnset) 0x20 thru 0x3f. the chained devices work together to ensure that the system operates at optimum efficiency. note that the accuracy of the feedback chain may degrade through each link of the fbin/fbon chain by as much as 2%. determine the potential worst case maximum fbon current i fbon(max/min) using: i fbon(max / min) = 255 a * (0.98) n -1 , where n is the number of MSL3163/4s connected in series. use this result in the above r top resistor equation for the term i fbon(max) instead of using 255a. take care in laying out the traces for the efficiency optimizer connections. minimize the fbin/fbon trace lengths as much as possible. do not route the signals close to traces with large variations in voltage or current, because noise may couple into fbin. if these traces must be routed near noisy signals, shield them from noise by using ground planes or guard traces. atmel led drivers-MSL3163 and msl3164 16-string white & rgb led drivers with adaptive power control, e2prom, and spi/i2c/smbus serial interface
16 atmel led drivers-MSL3163/msl3164 figure 7. example of cascading multiple devices to optimize common power supplies direct pwm control of the led strings an external pwm signal applied to the pwm input allows direct pwm control over the strings when bits pwmen and pwmdirect are set in pwm control register 0x1e. this configuration bypasses phi and gsc, but allows automatic led string phase delay using bit d2 of register 0x1e. the pwm input can also be configured as a gate for the output of the pwm engine using the pwm global enable bit d3 of the pwm control register 0x1e.
17 atmel led drivers-MSL3163/msl3164 register map and the e 2 prom register map summary control the MSL3163/4 using the 96 registers in the range 0x00 thru 0x5f (table 2). it may be convenient, and it is allowed, to read and write to unused bits in this range when accessing registers, but always write zeros. reads from unused bits always return zeros. three additional registers, 0x90, 0x91 and 0x93 allow access to the e 2 prom and provide efficiency optimizer status. the power-up default values for all control registers are stored within the on-chip e2prom, and any of these e2prom values may be changed through the serial interface. table 2. atmel led drivers-MSL3163/4 register map address and register name function register data d7 d6 d5 d4 d3 d2 d1 d0 0x00 control0 led string enables str7en str6en str5en str4en str3en str2en str1en str0en 0x01 control1 str15en str14en str13en str12en str11en str10en str9en str8en 0x02 powerctrl fault confguration sleep i 2 ctoen phiminfen gscmaxfen strscfen strocfen fboocen fboen 0x03 fltstatus fault status, global - - phiminflt gscmaxflt strscdet strocdet fbooc fltdet 0x04 ocstat0 string open circuit fault status oc7 oc6 oc5 oc4 oc3 oc2 oc1 oc0 0x05 ocstat1 oc15 oc14 oc13 oc12 oc11 oc10 oc9 oc8 0x06 scstat0 string short circuit fault status sc7 sc6 sc5 sc4 sc3 sc2 sc1 sc0 0x07 scstat1 sc15 sc14 sc13 sc12 sc11 sc10 sc9 sc8 0x08 fltmask0 string fault masks flten7 flten6 flten5 flten4 flten3 flten2 flten1 flten0 0x09 fltmask1 flten15 flten14 flten13 flten12 flten11 flten10 flten9 flten8 0x0a fboctrl0 effciency optimizer control hdrmstep[1:0] fbcldly[1:0] fbsdly[1:0] fbcfdly[1:0] 0x0b fboctrl1 sccdly[1:0] decrstep[1:0] initpwm acal100 acalen ichkdis 0x0c fbodac1 effciency optimizer dac readback fbodac1[7:0] 0x0d fbodac2 fbodac2[7:0] 0x0e fbodac3 fbodac3[7:0] 0x0f istr 8-bit global string current istr[7:0] 0x10 oscctrl oscillator frequency - - - - - osctrl[2:0] 0x11 gscctrl gsc processing control gscchk- sel - - - gscmaxen gscpol gscphi- syncen gscinten 0x12 gscgen internal gsc clock generator gscgen[7:0] 0x13 gscgen[15:8] 0x14 gscmul gsc multiplier - - - gscmul[4:0] 0x15 gscdiv gsc divider - - - - gscdiv[3:0] 0x16 gscmax max oscillator cycles between gsc pulses gscmax[7:0] 0x17 gscmax[15:8] 0x18 phictrl phi processing control - - - - - phiminen phipol phiinten 0x19 phigen internal phi clock generator phigen[7:0] 0x1a phigen[15:8] atmel led drivers-MSL3163 and msl3164 16-string white & rgb led drivers with adaptive power control, e2prom, and spi/i2c/smbus serial interface
18 atmel led drivers-MSL3163/msl3164 address and register name function register data d7 d6 d5 d4 d3 d2 d1 d0 0x1b unused 0x1c phimin min gsc pulses over phi period phimin[7:0] 0x1d - - - - phimin[11:8] 0x1e pwmctrl pwm control fldbken - ginten pwm- oflowen pwmglblen pha- dlyen pwm- direct pwmen 0x1f gint global pwm scaling gint[7:0] 0x20 str0set phase delay and eo assignment for string 0 phdly0[7:0] 0x21 colstr0[1:0] - - phdly[11:8] 0x3e str15set phase delay and eo assignment for string 15 phdly15[7:0] 0x3f colstr15[1:0] - - phdly[11:8] 0x40 pwm0 12-bit pwm setting for string 0 pwm0[7:0] 0x41 - - - - pwm0[11:8] 0x5e pwm15 12-bit pwm setting for string 15 pwm15[7:0] 0x5f - - - - pwm15[11:8] - do not access address range 0x60 thru 0x8f - 0x90 e2addr e2prom read/ write access - e2addr[6:0] 0x91 e2ctrlsta e2busy bldact e2err - - rwctrl[2:0] 0x93 fbostatus fbo status fboopen[3:1] fboactive[3:1] fbocal fboinitcal table 2. atmel led drivers-MSL3163/4 register map
19 atmel led drivers-MSL3163/msl3164 table 3. atmel led drivers-MSL3163/4 register power-up defaults register name and address power-up condition register data d7 d6 d5 d4 d3 d2 d1 d0 0x00 control0 led strings str0 thru str7 enabled 1 1 1 1 1 1 1 1 0x01 control1 led strings str8 thru str15 enabled 1 1 1 1 1 1 1 1 0x02 powerctrl effciency optimizer outputs enabled fbo open circuit detection enabled string open circuit detection enabled led short circuit detection enabled gsc maximum fault detection disabled phi minimum fault detection disabled i 2 c bus timeout detection enabled device awake 0 1 0 0 1 1 1 1 0x08 fltmask0 fault detection enabled on all strings 1 1 1 1 1 1 1 1 0x09 fltmask1 1 1 1 1 1 1 1 1 0x0a fboctrl0 current sink error confrmation delay = 4s fbo power supply correction delay = 2ms effciency optimizer recalibration delay = 1s effciency optimizer correction steps = 6 current sink error detection not disabled auto recalibration enabled pwm settings used during auto recalibration pwm duty cycle = 100% during initial calibration effciency optimizer operates using 1a steps led short circuit confrmation delay = 4s 0 0 0 0 0 0 0 0 0x0b fboctrl1 0 0 0 1 0 0 1 0 0x0f istr strings current set to 50% of r iled setting 0 1 1 1 1 1 1 1 0x10 oscctrl f osc = 20mhz 0 0 0 0 0 1 0 0 0x11 gscctrl gsc synchronized to the falling edge of the external signal 0 0 0 0 0 0 0 0 0x12 gscgen although disabled, internal gsc frequency = 20mhz / (19 + 1) = 1mhz 0 0 0 1 0 0 1 1 0x13 0 0 0 0 0 0 0 0 0x14 gscmul gsc multiplied by 4 0 0 0 0 0 0 1 1 0x15 gscdiv gsc not divided 0 0 0 0 0 0 0 0 0x16 gscmax although disabled, gsc max count is set to 19 clock cycles 0 0 0 1 0 0 1 1 0x17 0 0 0 0 0 0 0 0 0x18 phictrl phi synchronized to the falling edge of the external signal 0 0 0 0 0 0 0 0 0x19 phigen although disabled, internal phi frequency = 20mhz / (8 * (10416 + 1)) = 240hz 1 0 1 1 0 0 0 0 0x1a 0 0 1 0 1 0 0 0 0x1c phimin no phi minimum 0 0 0 0 0 0 0 0 0x1d 0 0 0 0 0 0 0 0 register power-up defaults register power-up default values are shown in table 3 atmel led drivers-MSL3163 and msl3164 16-string white & rgb led drivers with adaptive power control, e2prom, and spi/i2c/smbus serial interface
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