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lifecyclephase: revision : 3 expired period: forever release date:2012-03-16 12:00:33.0 1 copyright ? 2010, everlight all rights reserved. release date : 3.5.2012. issue no: dls-0000034 www.everlight.com smd ? i 2 c digital ambient light sensor als-pdic17-79nb/tr8 features ? close to the human eye's response ? 15 bit effective resolution ? 50hz/60hz rejection ? low sensitivity variation across various light sources ? operating temperature performance, -40 o c to 85 o c ? wide supply voltage range, 2.7v to 5.5v ? low power consumption, less than 2mw while operating ? shut-down mode, current consumption less than 0.1ua ? i 2 c serial port communication: (1) standard 100khz, (2).fast 400khz ? high dynamic sensing range and from 0 to 88,400 lux ? size: 2.0mm(l)*2.0mm(w)*0.6mm(h) ? rohs compliant and pb free description the als-pdic17-79nb/tr8 is a digital-output light sensor with a two-wire, i 2 c serial interface that is compatible with smbus when working at 100khz serial clock frequency. it combines a photodiode and an analog-to-digital converter (adc) on a single cmos integrated circuit to provide light measurements over an effective 15-bit dynamic range. two operation modes are provided with one for constantly refreshing adc and the other for one time integration. when working in ?one time integration? mode, no external resister is required. the integrating conversion technique used by als-pdic17-79nb/tr8 effectively eliminates the effect of flicker from ac-powered lamps, increasing the stability of the measurement. als-pdic17-79nb/tr8 wavelength is close to human-eye, and low response to non-visible light, such as infrared and ultra-violet light. applications ? detection of ambient light for controlling the backlighting of tft lcd display ? automatic residential and commercial lighting management ? automatic contrast enhancement for electronic signboard ? ambient light monitoring device for daylight and artificial ligh t
lifecyclephase: revision : 3 expired period: forever release date:2012-03-16 12:00:33.0 datasheet smd ? i 2 c digital ambient light sensor als-pdic17-79nb/tr8 2 copyright ? 2010, everlight all rights reserved. release date : 3.5.2012. issue no: dls-0000034 www.everlight.com absolute maximum ratings (ta=25
) parameter symbol rating unit storage temperature t stg -40 ~ 100
operating temperature t opr -40 ~ 85
supply voltage v dd -0.3 ~ 6 v digital output voltage v o -0.3 ~ 6 v digital output current i o -10 ~ 10 ma esd tolerance (human body model) esd hbm 3500 v esd tolerance (machine model) esd mm 150 v block diagram & pad descriptions figure 1 als-pdic17-79nb/tr8 functional block diagram
lifecyclephase: revision : 3 expired period: forever release date:2012-03-16 12:00:33.0 datasheet smd ? i 2 c digital ambient light sensor als-pdic17-79nb/tr8 3 copyright ? 2010, everlight all rights reserved. release date : 3.5.2012. issue no: dls-0000034 www.everlight.com pad description pad i/o function vdd power supply voltage gnd power power and signal return rext input connecting a resistor to gnd for adjusting integration time sda i/o i 2 c data input/output terminal scl input i 2 c derail clock input terminal adrs i/p i 2 c address option pad electro-optical characteristics (ta=25
) parameter symbol min. typ. max. unit condition active mode supply current i dd ----- 0.4 0.5 ma v dd =3.3v power-down mode supply current i ddq ----- ----- 0.1 a v dd =3.3v detection full counts ----- ----- 32767 counts detection limit ----- 44200 ----- lux t int =100ms peak sensitivity wavelength p ----- 550 ----- nm response in dark environment r dak ----- ---- 1 count v dd =3.3v e v =0lux t int =100ms response in fluorescent light r frst100 44 73 102 counts v dd =3.3v e v =100lux t int =100ms response in fluorescent light r frst1000 440 730 1020 counts v dd =3.3v e v =1000lux t int =100ms note: 1. fluorescent light (color temperature = 6500k) is used as light source. however, white led is substituted in mass production.
lifecyclephase: revision : 3 expired period: forever release date:2012-03-16 12:00:33.0 datasheet smd ? i 2 c digital ambient light sensor als-pdic17-79nb/tr8 4 copyright ? 2010, everlight all rights reserved. release date : 3.5.2012. issue no: dls-0000034 www.everlight.com dc characteristics of i 2 c signals in standard and fast mode standard mode fast mode parameter symbol min. max. min. max unit power supply voltage (recommend) v dd 2.7 5.5 2.7 5.5 v low level input voltage v il -0.5 1 -0.5 1 v high level input voltage v ih ----- v dd *0.6 ----- v dd *0.6 v hysteresis of schmitt trigger inputs (v dd > 2v) v hys 0.05*v dd ----- 0.05*v dd ----- v low level output voltage (open drain) at 3ma sink current (v dd > 2v) v ol1 0 0.4 0 0.4 v output fall time from v ihmin to v ilmax with a bus capacitance from 10pf to 400pf t of ----- 250 [2] 20+0.1cb [1] 250 [2] ns input current of each io pins with an input voltage between 0.1v dd and 0.9v dd i input -10 10 -10 10 a capacitance for each io pin c i ----- 10 ----- 10 pf note: 1. cb = capacitance of one bus line in pf 2. the maximum tr for the i 2 c data and clock bus lines quoted in the ac table is longer than the specified maximum t of for the output stages (250ns). this allows series protection resistors (rs) to be connected between i 2 c data / clock pins and the i 2 c data / clock bus lines without exceeding the maximum specified tf.
lifecyclephase: revision : 3 expired period: forever release date:2012-03-16 12:00:33.0 datasheet smd ? i 2 c digital ambient light sensor als-pdic17-79nb/tr8 5 copyright ? 2010, everlight all rights reserved. release date : 3.5.2012. issue no: dls-0000034 www.everlight.com ac characteristics of i 2 c signals in standard and fast mode standard mode fast mode parameter symbol min. max. min. max unit i 2 c clock frequency f scl 0 100 0 400 khz hold time (repeated) start condition. after this period, the first clock pulse is generated. t hd;sta 4.0 0.6 - us low period of i 2 c clock t low 4.7 1.3 us high period of i 2 c clock t high 4.0 0.6 us set-up time for a repeated start condition t su;sta 4.7 0.6 us data hold time for i 2 c-bus devices t hd;dat 0 3.45 0 0.9 us data set-up time t su;dat 250 - 100 - ns rise time of both i 2 c data and clock signal?s tr - 1000 5 300 ns fall time of both i 2 c data and clock signal?s tf - 300 0.1 300 ns set-up time for stop condition t su;sto 4.0 - 0.6 - us bus free time between stop and start condition t buf 4.7 - 1.3 - us capacitive load for each bus line cb - 400 - 400 pf figure 2 i 2 c timing diagram
lifecyclephase: revision : 3 expired period: forever release date:2012-03-16 12:00:33.0 datasheet smd ? i 2 c digital ambient light sensor als-pdic17-79nb/tr8 6 copyright ? 2010, everlight all rights reserved. release date : 3.5.2012. issue no: dls-0000034 www.everlight.com typical electro-optical characteristics curves fig 3 light output vs. illuminance (ta=25 )
fig 4 current consumption vs. illuminance (ta=25 )
fig 5 current consumption vs. supply voltage (ta=25 )
fig 6 dark count vs. supply voltage (ta=25 )
fig 7 light counts vs. supply voltage (ta=25 )
fig 8 current consumption vs. temperature
lifecyclephase: revision : 3 expired period: forever release date:2012-03-16 12:00:33.0 datasheet smd ? i 2 c digital ambient light sensor als-pdic17-79nb/tr8 7 copyright ? 2010, everlight all rights reserved. release date : 3.5.2012. issue no: dls-0000034 www.everlight.com fig 9 dark count vs. temperature fig 10 light counts vs. temperature fig 11 spectrum fig 12 relative sensitivity vs. angle communication protocol als-pdic17-79nb contains an 8-bit command register that can be written and read via the i 2 c bus. the command register controls the overall operation of the device. there is a two-byte word read-only register that contains the latest converted value of a/d converter. the i 2 c slave address is hardwired internally as 00111001 (0x39, msb to lsb, a6 to a0). all the send byte protocol, the receive byte protocol and receive word protocol are implemented in als-pdic17-79nb. the send byte protocol allows single bytes of data to be written to the device (see figure 13-a). the written byte is called the command byte. the receive byte protocol allows one-byte data to be read from the device (see figure 13-b). two-byte data can be read by following the receive word protocol shown in figure 13-c. in figure 13, the clear area represents data sent by the host (master) and the shaded area represents data returned by the ambient light sensor (slave device).
lifecyclephase: revision : 3 expired period: forever release date:2012-03-16 12:00:33.0 datasheet smd ? i 2 c digital ambient light sensor als-pdic17-79nb/tr8 8 copyright ? 2010, everlight all rights reserved. release date : 3.5.2012. issue no: dls-0000034 www.everlight.com 1 7 1 1 8 1 1 s slave address wr a command byte a p 0 0 0 (a) send byte protocol 1 7 1 1 8 1 1 s slave address rd a data na p 1 0 1 (b) receive byte protocol 1 7 1 1 8 1 8 1 1 s slave address rd a ls byte of adc a ms byte of adc na p 1 0 0 1 (c) receive word (two bytes) protocol s = start condition p = stop condition shaded = slave transmission a = acknowledge na = not acknowledge wr = write rd = read figure 13 communication protocol communication format als-pdic17-79nb is capable of working as an i 2 c slave. address of this device on i 2 c bus is always 0x39 (hexadecimal number 39). registers of the slave device can be programmed by sending commands over i 2 c bus. figure 14 shows an i 2 c write operation. to write to an internal register of the slave device a command must be sent by an i 2 c master. as illustrated in figure 14, the i 2 c write command begins with a start condition. after the start condition, seven bits of address are sent with msb going first. rd / wrn (=low) command bit follows the address bits. upon receiving a valid address the slave device responds by driving sda low for an ack. after receiving an ack, i 2 c master sends eight bits of data with msb first. upon receiving eight bits of data the slave device generates an ack. i 2 c master terminates this write command with a stop condition. figure 14 i 2 c timing diagram for send byte format
lifecyclephase: revision : 3 expired period: forever release date:2012-03-16 12:00:33.0 datasheet smd ? i 2 c digital ambient light sensor als-pdic17-79nb/tr8 9 copyright ? 2010, everlight all rights reserved. release date : 3.5.2012. issue no: dls-0000034 www.everlight.com figure 15 shows an i 2 c read command sent by the master to the slave device. i 2 c read command begins with a start condition. after the start condition seven bits of address are sent by the master with msb going first. after the address bits, rd / wrn command bit is sent. for a read command the rd / wrn bits is high. upon receiving the address bits and rd / wrn command bits the slave device responds with an ack. after sending an ack, the slave device sends eight bits of data with msb going first. after receiving the one byte data, the i 2 c master terminates this transaction by issuing a nack command to indicate that the master only wanted to read one byte from the device. the master generates a stop condition to end this transaction. figure 15 i 2 c timing diagram for receive byte format ambient light intensity count value can be obtained by reading registers of this device. ambient light intensity count is a 15-bit wide number plus a valid bit and hence word (two bytes) read operation is needed, as shown in figure 16. after receiving the two byte data, the i 2 c master terminates this transaction by issuing a nack command to indicate that the master only wanted to read two bytes from the device. the master generates a stop condition to end this transaction. figure 16 i 2 c timing diagram for receive word format
lifecyclephase: revision : 3 expired period: forever release date:2012-03-16 12:00:33.0 datasheet smd ? i 2 c digital ambient light sensor als-pdic17-79nb/tr8 10 copyright ? 2010, everlight all rights reserved. release date : 3.5.2012. issue no: dls-0000034 www.everlight.com theory of operation the photocurrent, generated by the built-in photodiode while being illuminated, is proportionally converted to frequency; the digital frequency signal is then integrated by a 15-bit counter for a predetermined period of time ( t int). this period of time is called integration time which can be adjusted by changing the nominal value of the resistor between the rint and gnd terminals. the converted data are read out through a two-wire, i 2 c interface bus. since the photodiode has been specially processed to suppress the spectral response in infrared region, the readout is very close to the photopic transf er function, v(), which is the mathematic expression of human -eye's response to ambient light. address option for i 2 c the i 2 c address is determined before placing an order; users can assign any one of the three addresses (0x39, 0x29, 0x44) for their specific application. without any prior request for a specific i2c address, the default address is 0x39 . address pin configuration i 2 c address floating 0x39 (default) tied to gnd 0x29 tied to vcc 0x44 table 1 connecting options of i 2 c address adc register the adc register contains 16 bits with a 15-bit wide data from d0 to d14 and a valid bit d15. the register is divided into two groups; d[15..8] is the most significant (ms) byte and d[7..0] is the least significant (ls) byte. see table 2 for details. table 2 adc register structure valid bit data bits d15 d14 d13 ~ d8 d7~d1 d0 msb lsb most significant (ms) byte least significant (ls) byte
lifecyclephase: revision : 3 expired period: forever release date:2012-03-16 12:00:33.0 datasheet smd ? i 2 c digital ambient light sensor als-pdic17-79nb/tr8 11 copyright ? 2010, everlight all rights reserved. release date : 3.5.2012. issue no: dls-0000034 www.everlight.com device command there are eight command codes are provided for i2c master to control the ambient light sensor. the specific function corresponding to each command code is elaborate in table 3. table 3 command code list command code function 1xxx_xxxx (binary code) shut-down mode, this is the default state after applying v dd power to the device. during shut-down mode, users can do the communication test. except the msb must be logic 1, the value written to the command register will not change any function and can be read back via the i 2 c bus by issuing receive byte protocol . 0x0c activate the ambient light sensor and put the device in [continuous operation mode], the adc register will be refreshed every t int integration time which is set by an external resistor rext. see table 4 for details. 0x04 activate the ambient light sensor and put the device in [one time integration mode]. the integration time is controlled by i 2 c commands, start and stop integration. 0x08 start integration: this command will reset the adc register to 0x0000 and begin a new integration in [one time integration mode]. this is an invalid command in [continuous operation mode]. 0x30 stop integration: this command will stop the integration in [one time integration mode] and set the valid bit ( d[15] ) high. this is an invalid command in [continuous operation mode].
lifecyclephase: revision : 3 expired period: forever release date:2012-03-16 12:00:33.0 datasheet smd ? i 2 c digital ambient light sensor als-pdic17-79nb/tr8 12 copyright ? 2010, everlight all rights reserved. release date : 3.5.2012. issue no: dls-0000034 www.everlight.com programming sequence case 1: using internal integration timing (1). after being powered on, the device will initially be in the shut-down mode (default setting). (2). to operate the device, issue an send byte protocol (see figure 13-a) with the device address 0x39 followed by a command byte of 0x0c to activate the ambient light sensor and put the device into "continuous operation mode". (3). to read the adc conversion result, issue an receive word protocol (see figure 13-c) with the device address 0x39 followed by two-byte reading procedures. (4). if a conversion has not been completed since being activated, the valid bit ( d[15] ) will be 0 to indicate that the data is not valid. if there is a valid conversion result available, the valid bit ( d[15] ) will be set logic high, and the remaining 15 bits will represent valid data from the adc register. (5). data may be read repeatedly from the adc register, and although it will remain valid, the adc register will not be updated until a new conversion completes. case 2: using external integration timing (1). after being powered on, the device will initially be in the shut-down mode (default setting). (2). to operate the device, issue an send byte protocol (see figure 13-a) with the device address 0x39 followed by a command byte of 0x04 to activate the ambient light sensor and put the device into "one time integration mode". (3). i 2 c master sends a "start integration command" to the salve device by issuing send byte protocol with the device address 0x39 followed by a command byte of binary code (1xxx_xxxx). (4). after a period of user defined integration time, i 2 c master sends a "stop integration command" to the salve device by issuing send byte protocol with the device address 0x39 followed by a command byte of 0x30. (5). to read the adc conversion result, issue an receive word protocol (see figure 13-c) with the device address 0x39 followed by two-byte reading procedures. (6). if the stop integration command is not received by the device, the valid bit (d [15]) will be ?0? to indicate that the data is not valid. if there is a valid conversion result available, the valid bit (d [15]) will be set logic high, and the remaining 15 bits will represent valid data from the adc register. (7). data may be read repeatedly from the adc register, and although it will remain valid, the adc register will not be updated until a new complete integration cycle has been carried out. in both cases, the power consumption of the device can be reduced by issue an send byte protocol with the device address 0x39 followed by a data byte of 1xxx_xxxx.(binary code)
lifecyclephase: revision : 3 expired period: forever release date:2012-03-16 12:00:33.0 datasheet smd ? i 2 c digital ambient light sensor als-pdic17-79nb/tr8 13 copyright ? 2010, everlight all rights reserved. release date : 3.5.2012. issue no: dls-0000034 www.everlight.com noise rejection and integration time in general, integrating type adc?s have an excellent noise rejection characteristics for periodic noise sources whose frequency is an integer multiple of the integration time. for instance, a 60hz ac unwanted signal?s sum from 0ms to n*16.66ms (n = 1, 2...ni) is zero. similarly, setting the als-pdic17-79nb integration time to an integer multiple of periodic noise signal greatly improves the light sensor output signal in the presence of noise. the integration time, t int , of the als-pdic17-79nb is set by an external resistor rext. the maximum detection range is inversely proportional to the integration time; that means the longer integration time the lower detection range. table 4 rext resistor selection guide in order to achieve both 60hz and 50hz ac rejection, the integration time needs to be adjusted to coincide with an integer multiple of the ac noise cycle times. to determine a suitable integration time, t int, that will ignore the presence of both 60hz and 50hz noise, users can use the formula: t int = n(1/60hz) = m(1/50hz), where n and m are integers. n/m = 60hz/50hz = 6/5. the first instance of integer values at which t int rejects both 60hz and 50hz is when m = 5, and n = 6, thus, t int = 6(1/60hz) = 5(1/50hz) = 100ms, rext = t int* (100k/100ms) = 100k, (see table 4) by populating rext = 100k, als -pdic17-79nb defaults to 100ms integration time in continuous operation mode, and will reject the presence of both 60hz and 50hz power line signals. when working in one-time integration mode, the master must control the integration time to be an integer multiple of 100ms. rext (k) integration time ( ms ) detection range ( lux ) resolution ( lux / count ) 50 (min.) 50 88,400 2.7 100 (recommended) 100 44,200 1.35 200 200 22,200 0.68 300 300 14,500 0.45 400 (max.) 400 11,100 0.34
lifecyclephase: revision : 3 expired period: forever release date:2012-03-16 12:00:33.0 datasheet smd ? i 2 c digital ambient light sensor als-pdic17-79nb/tr8 14 copyright ? 2010, everlight all rights reserved. release date : 3.5.2012. issue no: dls-0000034 www.everlight.com the power supply lines must be decoupled with capacitors, 4.7uf and 0.1uf, placed as close to the device package as possible. the bypass capacitor should have low effective series resistance (esr) and effective series inductance (esi), such as the common ceramic types, which provide a low impedance path to ground at high frequencies to handle transient currents caused by internal logic switching. als-pdic17-79nb is relatively insensitive to layout. like other i 2 c devices, it is intended to provide excellent performance even in significantly noisy environments. there are only a few considerations that will ensure best performance. route the supply and i 2 c traces as far as possible from all sources of noise. use two power-supply decoupling capacitors, 4.7f and 0.1f, placed close to the device. power supply decoupling and layout rext is not required working in " one time integration " mode. cb is optional for long distance connection when
lifecyclephase: revision : 3 expired period: forever release date:2012-03-16 12:00:33.0 datasheet smd ? i 2 c digital ambient light sensor als-pdic17-79nb/tr8 15 copyright ? 2010, everlight all rights reserved. release date : 3.5.2012. issue no: dls-0000034 www.everlight.com package dimensions note: tolerances unless mentioned 0.1mm. unit = mm moisture resistant packing materials label explanation ? cpn: customer?s product number ? p/n: product number ? qty: packing quantity ? cat: luminous intensity rank ? hue: dom. wavelength rank ? ref: forward voltage rank ? lot no: lot number
lifecyclephase: revision : 3 expired period: forever release date:2012-03-16 12:00:33.0 datasheet smd ? i 2 c digital ambient light sensor als-pdic17-79nb/tr8 16 copyright ? 2010, everlight all rights reserved. release date : 3.5.2012. issue no: dls-0000034 www.everlight.com reel dimensions carrier tape dimensions: loaded quantity 2000 pcs per reel w e f 8.00 ? 0.20 1.75 ? 0.10 3.50 ? 0.05 d0 d1 p0 1.50+0.10 -0 1.00 ? 0.10 4.00 ? 0.05 p1 p2 t 4.00 ? 0.10 2.00 ? 0.05 0.23 ? 0.05 a0 b0 k0 2.15 ? 0.05 2.15 ? 0.05 0.95 ? 0.05 note: tolerances unless mentioned 0.1mm. unit = mm moisture resistant packing process
lifecyclephase: revision : 3 expired period: forever release date:2012-03-16 12:00:33.0 datasheet smd ? i 2 c digital ambient light sensor als-pdic17-79nb/tr8 17 copyright ? 2010, everlight all rights reserved. release date : 3.5.2012. issue no: dls-0000034 www.everlight.com 1. do not open moisture proof bag before devices are ready to use. 2. shelf life in sealed bag from the bag seal date : 18 months at 10c~30c and < 90% rh. 3. after opening the package, the devices must be stored at 10c~30c and ? 60%rh, and used within 168 hours (floor life). 4. if the moisture absorbent material ( desiccant material) has faded or unopened bag has exceeded the shelf life or devices (out of bag) have exceeded the floor life, baking treatment is required. 5. if baking is required, refer to ipc/jedec j-std-033 for bake procedure or recommend the following conditions: 192 hours at 40c +5/?0c and < 5 % rh (reeled/tubed/loose units) or 96 hours at 60c 5c and < 5 % rh (reeled/tubed/loose units) or 24 hours at 125c 5c, not suitable for reel or tubes. notice: 1. reflow soldering should not be done more than two times. 2. when soldering, do not put stress on the devices during heating. 3. after soldering, do not warp the circuit board. 4. reference: ipc/jedec j-std-020d 5. recommend soldering pad as drawing. recommended method of storage recommended solder profile
lifecyclephase: revision : 3 expired period: forever release date:2012-03-16 12:00:33.0 datasheet smd ? i 2 c digital ambient light sensor als-pdic17-79nb/tr8 18 copyright ? 2010, everlight all rights reserved. release date : 3.5.2012. issue no: dls-0000034 www.everlight.com each terminal is to go to the tip of soldering iron temperature less than 350
for 3 seconds within once in less than the soldering iron capacity 25w. leave two seconds and more intervals, and do soldering of each terminal. be careful because the damage of the product is often started at the time of the hand solder. repair should not be done after the device have been soldered. when repairing is unavoidable, a double-head soldering iron should be used (as below figure). it should be confirmed beforehand whether the characteristics of the device will or will not be damaged by repairing. soldering iron repairing
lifecyclephase: revision : 3 expired period: forever release date:2012-03-16 12:00:33.0 datasheet smd ? i 2 c digital ambient light sensor als-pdic17-79nb/tr8 19 copyright ? 2010, everlight all rights reserved. release date : 3.5.2012. issue no: dls-0000034 www.everlight.com note: 1. above specification may be changed without notice. everlight will reserve authority on material change for above specification. 2. when using this product, please observe the absolute maximum ratings and the instructions for using outlined in these specification sheets. everlight assumes no responsibility for any damage resulting from use of the product which does not comply with the absolute maximum ratings and the instructions included in these specification sheets. 3. these specification sheets include materials protected under copyright of everlight corporation. please don?t reproduce or cause anyone to reproduce them without everlight?s consent.

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