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lx1977 p roduction d atasheet microsemi analog mixed signal group 11861 western avenue, garden grove, ca. 92841, 714-898-8121, fax: 714-893-2570 page 1 smbus ambient light sensor www. microsemi . com tm ? l l x x 1 1 9 9 7 7 7 7 copyright ? 2010 rev. 1.0, 2010-03-25 descri pt i on k ey feat u res ? human eye spectral response ? very low ir sensitivity ? 12-bit resolution ? 5% typical accuracy ? rejection to 50/60hz interference ? programmable integration time ? programmable interrupt pin ? i 2 c compatible smbus interface ? easy processor interface ? no optical filter needed appli cat i on s the lx1977 is a cmos based ambient light sensor (als) with an i 2 c compatible smbus interface. this device is ideal for controlling display back lighting systems of low cost consumer products such as tv, portable computers, handheld devices, or medical devices. the lx1977 is optimized for a linear, accurate, and very repeatable input and output transfer function. the device also features adjustable input range and gain. the lx1977 has a spectral response that emulates the human eye. specially designed circuitry produces peak spectral response at 555 nm, with ir response less than 10% above 810 nm. input dynamic range of this device is adjustable via smbus command. it can be set to either 0 ~ 500 lux, 0 ~ 1000 lux, 0 ~ 2500 lux or 0 ~ 5000 lux. als internal compensation ensures photodiode dark current are at very low levels, providing high output accuracy at low ambient light levels. the lx1977 integrat es a 12-bit sigma- delta a/d converter that converts the als photodiode output into a digital word. this value is read via the i 2 c compatible smbus interface. the lx1977 als is internally optimized to an accuracy of a pproximately 5% over temperature. the high accuracy and repeatability of this device eliminates the need of calibration during product production, which results in reduced assembly time and lower production cost. the lx1977 is available in an 8-pin msop package, and is operational over the ambient temperature range -40 ? c to 85 ? c. ? backlight control for notebook ? backlight control for tv ? handheld devices ? medical devices note: i 2 c is a trade mark of philips pack age order i n fo t h erm al dat a du 3 x 5 glass top msop 8-pin ja = 152 c/w t a ( c) rohs compliant / pb-free thermal resistance - junction to ambient -40 to 85 lx1977idu note: available in tape & reel. append the letters tr to the part number. (i.e. lx1977idu -tr) junction temperature calculation: t j = t a + (p d x ja ). the ja numbers are guidelines for the thermal performance of the device/pc-board system. all of th e above assume no ambient airflow. absolu t e m ax i m u m rat i n gs pack age pi n ou t v dd ............................................................................................................... -0.3 to 6v dc input voltage to all i nput pins ........................................................... -0.3v to v dd + 0.3v smbus pin voltage (scl, sda) .................................................................. -0.3v to 5.5v smbus pin current (s cl, sda) ........................................................................... < 10 ma operating temperature range ........................................................................ - 40 to +85c storage temperature range.............................................................................- 40 to 100c rohs / pb-free peak package solder reflow temperature (40 seconds maximum e xposure) .................................................................... 260 (+0, -5) notes: exceeding these ratings could cause damage to th e device. all voltages are with respect to ground. currents are positive into, ne gative out of specified terminal. g lass t op msop 8 p in (top view) rohs / pb-free 100% matte tin obsolete downloaded from: http:///
lx1977 p roduction d atasheet microsemi analog mixed signal group 11861 western avenue, garden grove, ca. 92841, 714-898-8121, fax: 714-893-2570 page 2 smbus ambient light sensor www. microsemi . com tm ? l l x x 1 1 9 9 7 7 7 7 copyright ? 2010 rev. 1.0, 2010-03-25 produ ct h i gh li gh t v dd part lx1977 scl sda int adr v dd v ss p v dd v ss r set r set lx1977 d count vs lux @ fosc=40.96khz, t int =100ms vcc = 3.3v 0 1000 2000 3000 4000 0 1000 2000 3000 4000 5000 6000 lux input 0 ~ 500 lux 0 ~ 1000 lux 0 ~ 5000 lux 0 ~ 2500 lux si m pli fi ed block di agram pack age ph ot o v dd scl pre amplifier v ss smbus interface sda int adr v dd sigma- delta adc r set figure 1 C simplified block diagram figure 2 C product photo fu n ct i on al pi n descri pt i on name pin # dir description v dd 1 pwr power supply voltage sda 2 i / o smbus data C connect to smbus data line scl 3 i smbus clock C connect to smbus clock line int 4 o interrupt output pin, active low, open drain adr 5 i smbus address C the address for this device is determined by the state of this pin. adr = gnd sets address 20h, adr = open sets address 22h, adr=v dd sets address 70h. r set 6 i gain setting. for gain fine adjustment. typically, connect this pin to ground through a 1% 267k resistor. nc 7 no connection pin v ss 8 pwr ground reference for power and signal output obsolete downloaded from: http:///
lx1977 p roduction d atasheet microsemi analog mixed signal group 11861 western avenue, garden grove, ca. 92841, 714-898-8121, fax: 714-893-2570 page 3 smbus ambient light sensor www. microsemi . com tm ? l l x x 1 1 9 9 7 7 7 7 copyright ? 2010 rev. 1.0, 2010-03-25 elect ri cal ch aract eri st i cs unless otherwise specified, the following specificatio ns apply over the operating ambient temperature 0 c t a 70 c and the following test conditions: 3.0v v dd 4.5v parameter symbol test conditions / comment min typ max units p ower s upply operational voltage v dd note 5 3.0 4.5 v supply current i dd 0.2 ma supply current i dd shut down als 15 a i nternal 3.0v v dd . 3.6v 38.91 40.96 43.00 internal oscillator frequency f osc 3.0v v dd . 4.5v 36.86 40.96 45.06 khz als r esponse peak spectral response pr(als) 555 nm infrared response ir e v(white) = 100 lux, e v(810nm) = 14.6w/cm 2 , note 3 -8 8 % d count t int = 100 ms, note 4 4095 d count t int = 50 ms, note 4 2047 d count t int = 25 ms, note 4 1023 full scale adc output value @ f osc = 40.96khz, range_sel = 00b (0 ~ 500 lux) range_sel = 01b (0 ~ 1000 lux) range_sel = 10b (0 ~ 5000 lux) range_sel = 11b (0 ~ 2500 lux) d count t int = 6.25 ms, note 4 255 counts enable time t on software enable 100 s disable time t off software disable 100 s t f(90%~10%) light input change from 200 lux to 20 lux 1 dynamic response time t r(10%~90%) light input change from 20 lux to 200 lux 1 ms adc non-linearity dnl t int = 100ms, range_sel=00b note 6 -5 5 % als e v = 200 lux, note 1,2 346 372 398 e v = 500 lux, note 1,2 880 931 982 adc output count @ f osc = 40.96khz, t int = 50ms range_sel = 01b (0 ~ 1000 lux) d count e v = 1000 lux, note 1,2 1768 1861 1955 counts e v = 100 lux, note 1,2 692 745 797 e v = 200 lux, note 1,2 1403 1489 1575 adc output count @ f osc = 40.96khz, t int = 100ms range_sel = 00b (0 ~ 500 lux) d count e v = 500 lux, note 1,2 3537 3723 3909 counts e v = 200 lux 733 e v = 500 lux 1808 adc output count @ f osc = 40.96khz, t int = 100ms range_sel = 01b (0 ~ 1000 lux) d count e v = 1000 lux 3535 counts e v = 500 lux 364 e v = 1000 lux 713 adc output count @ f osc = 40.96khz, t int = 100ms range_sel = 10b (0 ~ 5000 lux) d count e v = 2000 lux 1437 counts e v = 500 lux 734 e v = 1000 lux 1433 adc output count @ f osc = 40.96khz, t int = 100ms range_sel = 11b (0 ~ 2500 lux) d count e v = 2000 lux 2851 counts dark adc count value d count e v = 0 lux, t a = 25 c, range_sel=00b, t int =100ms 0 4 counts obsolete downloaded from: http:///
lx1977 p roduction d atasheet microsemi analog mixed signal group 11861 western avenue, garden grove, ca. 92841, 714-898-8121, fax: 714-893-2570 page 4 smbus ambient light sensor www. microsemi . com tm ? l l x x 1 1 9 9 7 7 7 7 copyright ? 2010 rev. 1.0, 2010-03-25 elect ri cal ch aract eri st i cs unless otherwise specified, the following specificatio ns apply over the operating ambient temperature 0 c t a 70 c and the following test conditions: 3.0v v dd 4.5v parameter symbol test conditions / comment min typ max units e v = 0 lux, t a = 70 c, range_sel=00b, t int =100ms, note 7 18 smb us i nterface clock frequency f clk 10 400 khz high level input voltage 0.8 v low level input voltage v sda v scl 2.1 v input leakage current i sda /i scl -5 5 a sda low output voltage v sda i sda = 3ma 0.4 v sda current sinking capacity i sda 3 ma int low output voltage v int i int = 3ma 0.4 v int leakage current i leak -10 10 a adr high level input voltage 80% v dd adr open 40% 60% v dd adr low level input voltage v adr 20% v dd adr input leakage current i adr -10 10 a notes: 1. in production, the input irr adiance is supplied from a point source which is a white led. 2. see figure 3 3. ) (e d ) (e d ) e (e d v(white) count v(white) count v(ir) v(white) count ir ? + = 4. guarantee by scan tests. 5. specifications in the ec table are for 3.0v ~ 4.5v. device is operational down to 2.5v and up to 5.0v with relaxed specifica tions. 6. gain1 = (d count 2-d count 1) / (lux2-lux1), gain2 = (d count 3-d count 2) / (lux3-lux2), dnl1 = (gain1 * 2 / (gain1+gain2) -1) %, dnl2 = (gain2 * 2 / (gain1+gain2) C 1) %. lux1 = 100 lux, lux2 = 200 lux, lux3 = 500 lux. 7. for the setting range_sel=00b and t int =100ms, the full scale output is typical 3723 decimal. a dark adc output count of maximum 18 at t a = 70 c is only 0.5% of 3723. t est ci rcu i t s v dd to test computer white led 810nm part lx1977 sda v ss v dd scl int adr r set figure 3 C als output measurement obsolete downloaded from: http:///
lx1977 p roduction d atasheet microsemi analog mixed signal group 11861 western avenue, garden grove, ca. 92841, 714-898-8121, fax: 714-893-2570 page 5 smbus ambient light sensor www. microsemi . com tm ? l l x x 1 1 9 9 7 7 7 7 copyright ? 2010 rev. 1.0, 2010-03-25 appli cat i on n ot e b asic f unctionality the lx1977 is an als with an i 2 c compatible smbus interface. it contains a high sensitivity close to human eye response photodiode, a 12-bit sigma-delta adc and a smbus interface. the sigma-delta adc converts photodiode current to digital values that correspond to the light incident on the photodiode. the integrating nature of the adc allows the device to reject 50hz and 60hz flicker noise from environmental lighting. the sigma-delta adc provides the flexibility to set different conversion times, or integration time. it has four conversion time selections to meet different application requirements. the clock source for the adc is also selectable from either an internal clock or a smbus clock. for internal clock selection, the device features full speed (40.96khz) and quarter speed (10.24khz) selection. the adc co nversion result is stored in a 12-bit register for read back even when another conversion is in process. smbus i nterface lx1977 is a nine-register device which uses smbus or i 2 c protocols to communicate with the host system. all registers are defined as full byte wide. some registers contain reserved (undefined) bits with a default valu e of 0, or are read only bits that are status indicators. six of the nine registers are capable of both read and write, and three re gisters are read only. see the lx1977 register definitions section for details. the lx1977 communicates over the smbus and operates in a slave mode receiving commands and sending / receiving data to / from the host or master. only standard two-wire smbus and i 2 c compatible serial bus and protocols may be used for this device. the lx1977 can be configured for one of the three addresses by connecting the adr input pin to ground, v dd, or simply leaving it open. table 1: address strapping codes option # adr hex address 1 gnd 20h 2 open 22h 3 v dd 70h in this document, the device address is always expressed as full 8 bit address. the high nibble of the address is from bit 7 to bit 4. in the low nibble, bit 0 is always the r/w bit and in 8 bit address format it is considered 0. the address could be changed dynamically. the requirement is that after the change, the lx1977 als should be disabled and then enabled either via bit 6 of register 00h or a v dd power cycle. table 2: address = 20h 1 7 1 1 8 1 1 s slave address wr a data byte a p 0 0 1 0 0 0 0 0 table 3: address = 22h 1 7 1 1 8 1 1 s slave address wr a data byte a p 0 0 1 0 0 0 1 0 table 4: address = 70h 1 7 1 1 8 1 1 s slave address wr a data byte a p 0 1 1 1 0 0 0 0 smbus p rotocol the only required command protocols are smbus send byte, receive byte, read byte / word, and the write byte / word protocols. see table 7 ~ table 12 for details. writes to registers can be performed by either the smbus write byte / word protocols and / or by internal ic logic, depending on the register type (see table 13). send byte protocol can only be used on the command / status register (register 00h). read can be performed on all registers by issuing the read byte / word protocol. note that receive byte protocol can only be used on the command / status register (register 00h) for a quick test of the status bits. read only registers can be written only by internal logics. their contents will not be affected by smbus write commands. when lx1977 is initially powered, it will first test the address selection pin input to determine its own address and then look for its unique address each time it detects a start condition. if the address does not match, the lx1977 ignores all bus activity until it encounters another start condition. if the address is a match, the lx 1977 acknowledges that it has detected its address and a w/r bit to either read or write. if the obsolete downloaded from: http:///
lx1977 p roduction d atasheet microsemi analog mixed signal group 11861 western avenue, garden grove, ca. 92841, 714-898-8121, fax: 714-893-2570 page 6 smbus ambient light sensor www. microsemi . com tm ? l l x x 1 1 9 9 7 7 7 7 copyright ? 2010 rev. 1.0, 2010-03-25 appli cat i on n ot e w/r bit is a 0, signifying a write command, the next byte of data sent from the host will be a data byte or a command code (also called index), depending on whether there is a stop condition afterwards. if there is a stop condition, then the received byte is a data byte (n ot a command code or register index) to the lx1977 and this command will be sent to register 00h and executed. note that this is considered a send byte protocol, which can only be used on register 00h as stated before. if there is no stop condition detected, then the received byte is a command code (or register index). in this case, either one or two bytes of data will follow. the index points to an internal register in the lx1977 that will be the object of the subsequent data transfer. in a write protocol, the lx1977 will acknowle dge the receipt of a valid index. after the index, there will be another byte / word of data; this byte of data will be loaded into the indexed register. in lx1977 read / write word protocols, the command code (or register index) will always be the lower byte data register address. the higher byte of the data will be loaded into the register corresponding to the lower byte register index / command code incremented by 1. the lx1977 will ignore all additional bus activity once it has acknowledged the receipt of th e data byte(s) followed by a stop condition, and until the next start condition is detected. note that receipt of a stop condition or start condition will reset the address detection state machine. the lx1977 does not support packet error code. the host can read the contents of register 00h which contains the device status bits by issuing a simple receive byte protocol. in this command line, the w/r bit is set to a 1. upon the receipt of a receive byte protocol, the lx1977 will acknowledge that it has detected its address and a valid w/r bit; the device will then put a copy of the register 00h data onto the bus. the host can read the contents of the indexed register(s) within the lx1977 using a read byte / word protocol. in this protocol, the host first will send a write command indicating the device address and command code. after the write command is issued, the host initiates a repeat start condition followed by issuing a read from devices address. in read protocol, the command code is the index of the register(s) to be read. the repeat start condition will be followed by the slave address (refer to table 11 and table 12) and a read command bit. upon r eceipt of a read command, the lx1977 will acknowledge that it has detected its address and a valid read bit. subsequently, one byte of data starting from the indexed register address will be put onto the bus. a nack from the host signifies the end of the read command. if instead, an ack is received, then the lx1977 will put another byte of data from the next incremented register address onto the bus. a nack will signify the end of the read command. once the lx1977 has placed the byte(s) of da ta on the serial bus, it will ignore all additional bus activity until the next start condition is detected. obsolete downloaded from: http:///
lx1977 p roduction d atasheet microsemi analog mixed signal group 11861 western avenue, garden grove, ca. 92841, 714-898-8121, fax: 714-893-2570 page 7 smbus ambient light sensor www. microsemi . com tm ? l l x x 1 1 9 9 7 7 7 7 copyright ? 2010 rev. 1.0, 2010-03-25 smb us c ommon ac s pecifications the diagram below illustrates the various smbus timings and sets the context for the specifications to follow. note that the following are not production tested specifications, but are common smbus protocol specificat ions practiced. table 5: smbus (i 2 c compatible) timing fast_mode symbol parameter min max units f smb smbus operating frequency 10 400 khz t buf bus free time between stop and start condition 1.3 - s t hd:sta hold time after (repeated) start condition. after this period, the first clock is generated. 0.6 - s t su:sta repeated start condition setup time 0.6 - s t su:sto stop condition setup time 0.6 - s t hd:dat data hold time 0 0.9 s t su:dat data setup time 100 - ns t low clock low period 1.3 - s t high clock high period 0.6 - s t f clock / data fall time - 300 ns t r clock / data rise time - 300 ns t por time in which a device must be operational after power-on reset 500 ms c in capacitance for scl or sda pin 10 pf t low t r t high t f t hd:sta t buf v il v ih v il v ih p s t hd:dat t su:sta s t su:sto p t su:dat smbus clock (scl) smbus data (sda) figure 4 C smbus timing measurement obsolete downloaded from: http:///
lx1977 p roduction d atasheet microsemi analog mixed signal group 11861 western avenue, garden grove, ca. 92841, 714-898-8121, fax: 714-893-2570 page 8 smbus ambient light sensor www. microsemi . com tm ? l l x x 1 1 9 9 7 7 7 7 copyright ? 2010 rev. 1.0, 2010-03-25 smb us c ommunication p rotocol lx1977 employs the following smbus 2.0 protocols that are also compatible to i 2 c protocols. protocols used to communicate with lx1977 must be per standard smbus specification version 2.0 or higher. ? send byte ? receive byte ? write byte ? write word ? read byte ? read word the individual protocol format is shown in tables below. for a complete description of smbus protocols, please review the smbus specification at www.smbus.org/specs . table 6: smbus packet protocol diagram element key s slave address wr a data byte a p x x s start condition rd read (bit value of 1) wr write (bit value of 0) a acknowledge (0 for an ack, or 1 for a nack) p stop condition command code register address master-to-slave slave-to-master grey shading represents cycles during wh ich the lx1977 owns or drives the data line. all other cycles are driven by the host. table 7: send byte protocol: 1 7 1 1 8 1 1 s slave address wr a data byte a p 0 table 8: receive byte protocol: 1 7 1 1 8 1 1 s slave address rd a data byte a p 1 1 table 9: write byte protocol: 1 7 1 1 8 1 8 1 1 s slave address wr a command code a data byte a p 0 table 10: write word protocol: 1 7 1 1 8 1 8 1 8 1 1 s slave address wr a command code a data byte low a data byte high a p 0 obsolete downloaded from: http:///
lx1977 p roduction d atasheet microsemi analog mixed signal group 11861 western avenue, garden grove, ca. 92841, 714-898-8121, fax: 714-893-2570 page 9 smbus ambient light sensor www. microsemi . com tm ? l l x x 1 1 9 9 7 7 7 7 copyright ? 2010 rev. 1.0, 2010-03-25 table 11: read byte protocol: 1 7 1 1 8 1 1 7 1 1 8 1 1 s slave address wr a command code a s slave address rd a data byte a p 0 1 1 table 12: read word protocol: 1 7 1 1 8 1 1 7 1 1 8 1 8 1 1 s slave address wr a command code a s slave address rd a data byte low a data byte high a p 0 1 1 smb us r equirements ? when the als smbus interface is not powered, it will not affect other smbus tr affic that may occur. the smbus interface pins should be in high impedance m ode when the interf ace is not powered. ? smbus pull-up resistors should be provided on the system, and is not provided by the lx197 7 device. ? the als shall nack any smbus operation directed to it that addresses a register that is not defined in this specification. smbus d e - featuring package error correction, al arm function and the address resolution protocols are not supported by this device. lx1977 r egister d efinitions table 13: lx1977 register definitions register(hex) r / w description 00h r / w command / status de vice control and status 01h r / w device control als adc control 02h r / w low-threshold lsb lower byte of the interrupt low threshold window 03h r / w low-threshold msb higher 4 bits of the interrupt low threshold window 04h r / w high-threshold lsb lower byte of the interrupt high threshold window 05h r / w high-threshold msb higher 4 bits of the interrupt high threshold window 06h r lsb of d count lower byte of the adc result 07h r msb of d count higher 4 bits of the adc result 08h r id register part identification detailed descriptions of the individual register are shown below. obsolete downloaded from: http:///
lx1977 p roduction d atasheet microsemi analog mixed signal group 11861 western avenue, garden grove, ca. 92841, 714-898-8121, fax: 714-893-2570 page 10 smbus ambient light sensor www. microsemi . com tm ? l l x x 1 1 9 9 7 7 7 7 copyright ? 2010 rev. 1.0, 2010-03-25 command register 00h (r / w) table 14: command register 00h 7 6 5 4 3 2 1 0 adc_flag als_ena start_adc adc_mod adc_clk int_flag int_ena ov read only read / write read / write read / write read / write read / write read / write read only index address = 00000000b or 00h access = read / write default = 00000000b this register contains bits for configuring and controlling lx1977 and also bits showing lx1977 operation status. bit definitions: adc_flag (bit 7, r): this is a status bit and is a read only bit. when start_adc is set to 1, 0 on this bit indicates adc conversion is in process, 1 indicates conversion is done and the d count data is ready in register 06h & 07h. setting start_adc to 1 will clear adc_flag bit and start a new conversion regardless the status of the adc converte r. the time needed to finish a conversion will depend on the t int _set setting in device control register 01h bit 0 & 1. als_ena (bit 6, r / w): 0 on this bit means power down als and adc of this device, 1 means power up als and adc. start_adc (bit 5, r / w): writing 1 to this bit will start a new adc conversion and clear the adc_flag bit. writing 0 to this bit stops (or disable) adc conversion and also resets the internal interrupt persistent control counter when adc_mod bit is set to 1. when this bit is 0, adc_flag bit will not be meaningful. adc_mod (bit 4, r / w): 0 on this bit sets adc to one time conversion mode and 1 sets adc to continuous mode when start_adc bit is set to 1. note: these two bits should be controlled together. when these two bits are set to 11, lx1977 will be in continuous mode. when a restart of the continuous mode is need, 01 should be written to these bits and then 11 should be written afterwards. in this case, adc_flag , int_flag and the internal counter for int_persist_ctrl will be reset to 0. table 15: bit 5 & 4 definitions start_adc (bit 5) adc_mod (bit 4) description 0 0 disable adc 0 1 disable adc and reset internal interrupt persistent control counter, adc_flag and int_flag 1 0 set adc to one time conversion mode and start the conversion. adc_flag bit will indicate conversion status, 0 on this bit means conversion is in process, 1 means conversion is done and data is ready in register 06h and 07h . interrupt persistent control function is not applicable to this mode. note: 1) when this mode is set, the adc _flag will be set to zero right away. 2) when conversion is done, bit 5 and bit 4 will be changed from 10 to 00 automatically. if a new conversion is needed , 10 should be written to bit5 and bit 4 again. obsolete downloaded from: http:///
lx1977 p roduction d atasheet microsemi analog mixed signal group 11861 western avenue, garden grove, ca. 92841, 714-898-8121, fax: 714-893-2570 page 11 smbus ambient light sensor www. microsemi . com tm ? l l x x 1 1 9 9 7 7 7 7 copyright ? 2010 rev. 1.0, 2010-03-25 1 1 set adc to continuous conversion mode an d start conversion. adc_flag indicates conversion status, 0 means conversion is in pr ocess, 1 means previ ous conversion is done and data is ready in register 07h and 08h. actual ly, after the first convers ion, this bit will be always 1. interrupt function applies to this mode. note: when this mode is set, the adc_flag will be set to zero right away. adc_clk (bit 3, r / w): selects the internal adc clock speed when clk_sel (bit 7) of register 01h is 0 = 0, select clock speed to normal (40.96 khz) = 1, select clock speed to ? normal (10.24 khz) when clock speed is selected, the selectable integration time set will be determined automatically. for example, when adc_clk = 1 , the selectable integration time will be 25ms, 100ms, 200ms or 400ms. please refer to table 24 for details. int_flag (bit 2, r / w): interrupt status report = 0, no interrupt or was cleared. this bit can be set to 1 or 0 by smbus command. setting zero to this bit will set the int pin to high regardless of the previous state. when it is set to zero, the internal counter for int_persist_ctrl will be reset to 0. = 1, interrupt triggered. when this bit is 1 and int_ena = 1 , the int pin will be asserted low and stay low until this bit is set to zero or int_ena = 0 . writing 1 to this bit will override any internal setting and generate an interrupt if int_ena = 1 . this function is useful for testing user hardware and debugging software. note: adc will continue to run regardless of the interrupt status unless it is stopped by setting start_adc bit to 0. note that the adc integration time is much longer than the interrupt response time. data output of the adc that generated the interrupt must be read immediately as the next sampled data by the adc will write over the d count register during continuous conversion mode. int_ena (bit 1, r / w): interrupt enable bit = 0, disable interrupt pin function = 1, enable interrupt pin function note: (1) when int_ena = 0 , the int pin function will be disabled. however, the int_flag function could still be used as software interrupt to m onitor the als readings. the user can still set the thresholds and read the int_flag status periodically or when it is needed instead of reading the als data and calculating. if the int_flag = 1 , then it means the als reading is outside the boundaries. if this function is not needed, the user just simply ignores the int_flag bit status. (2) when int_ena = 1 , the int pin will perform the normal interrupt function. (3) when als_ena = 0 , the int pin will be set to high regardless of its previous status. ov (bit 0, r): overflow indicator. = 0, if d count has reached the maximum value and this bit is still 0, it means that the input light has reached the maximum range but not over. = 1, 1 on this bit indicates that the d count has reached the maximum value and the input light is over the selected range limit. bigger range should be selected. table 16: maximum count for different t int time d count t int = 100 ms 4095 full scale adc output value @ f osc = 40.96khz, range_sel = 00b (0 ~ 500 lux) d count t int = 50 ms 2047 counts obsolete downloaded from: http:///
lx1977 p roduction d atasheet microsemi analog mixed signal group 11861 western avenue, garden grove, ca. 92841, 714-898-8121, fax: 714-893-2570 page 12 smbus ambient light sensor www. microsemi . com tm ? l l x x 1 1 9 9 7 7 7 7 copyright ? 2010 rev. 1.0, 2010-03-25 d count t int = 25 ms 1023 range_sel = 01b (0 ~ 1000 lux) range_sel = 10b (0 ~ 5000 lux) range_sel = 11b (0 ~ 2500 lux) d count t int = 6.25 ms 255 note: adc output count will be always in the range as sp ecified in the above table. for example, if the t int is set to 6.25ms, the adc output count will be less or equal to 255 register 00h and send / receive byte protocols application: when host wants to send control command(s) that is contained in register 00, for example enable / disable als or start adc conversion, the send byte protocol could be used to simplify the communication. in send byte prot ocol, bit 7 of the data byte field should be set to 1 indicating this is a direct command and this command sh ould be put into register 00h and executed. the example is shown in table 17. table 17: send byte protocol 1 7 1 1 bit 7 bit 6 bit 5 bit 4 bit 3 bit 2 bit 1 bit 0 1 1 s slave address wr a cmd_flag a p 0 1 write byte protocol could also be used to implement the same function but with a longer communication time. when using write byte / word protocol to send command / data to registers (including register 0 0h), bit 7 in command code field should be set to 0 to indicate this byte is for the register address. bit 6, 5 & 4 ex cept for the register address bits (bit 3, 2, 1 & 0) need to be set to zero also. these bits in this command are used for internal test purpose. the detailed write byte / read byte protocols are shown below. table 18: write byte protocol 1 7 1 1 bit 7 bit 6 bit 5 bit 4 bit 3 bit 2 bit 1 bit 0 1 8 1 s slave address wr a cmd_flag 0 0 0 register address a data byte a p 0 0 00 ~ 08h register 00h could be read back by th e host via receive byte protocol or r ead byte protocol. when lx1977 receives a receive byte protocol, it will send a copy of register 00 data back to the host. when it receives read byte protocol, it will put register 00 data in the data byte field and send th e data back to host. see table 11 & table 19 for details. table 19: read byte protocol 1 7 1 1 bit 7 bit 6 bit 5 bit 4 bit 3 bit 2 bit 1 bit 0 1 1 7 1 1 8 1 s slave address wr a cmd_flag 0 0 0 register address a s slave address rd a data byte a p 0 0 00 ~ 08h 1 1 examples of setting register 00 h by using send byte protocol one of the sample lx1977 settings and send byte protocol could be as shown below. table 20: sample send byte protocol 1 7 1 1 bit 7 bit 6 bit 5 bit 4 bit 3 bit 2 bit 1 bit 0 1 1 s slave address wr a cmd_flag a p 0 1 1 1 1 0 0 1 1 obsolete downloaded from: http:///
lx1977 p roduction d atasheet microsemi analog mixed signal group 11861 western avenue, garden grove, ca. 92841, 714-898-8121, fax: 714-893-2570 page 13 smbus ambient light sensor www. microsemi . com tm ? l l x x 1 1 9 9 7 7 7 7 copyright ? 2010 rev. 1.0, 2010-03-25 this protocol will send commands to lx1977 and will write the command byte into register 00h for configuring the device settings. 1) bit 6 will enable lx1977 als function 2) bit 5, 4 will set adc mode to continuous conversion mode and start adc 3) bit 3 will select 40.96 khz clock frequency as the sigma-delta adc clock 4) bit 2 will clear the interrupt flag no matter what it was 5) bit 1 will enable the interrupt function 6) bit 0 will be ignored since bit 0 of register 00h is a read only bit device control register 01h (r / w) table 21: control register 01h 7 6 5 4 3 2 1 0 clk_sel range_sel t int _set int_persist_set read / write read / write read / write read / write index address = 00000001b or 01h access = read / write default = 00000000b bit definitions: clk_sel (bit 7, r / w): selects the source of the adc clock = 0, use internal clock (the actual speed w ill depend on bit 3 of register 00h setting) = 1, use smbus host scl clock. since the clock gap between protocols is inconsistent, this mode is not recommended . range_sel (bit 6, 5, r / w): selects the detectable input light range. table 22: adc t int , range and resolution @ adc clock = 40.96 khz resolution in lux /count bit 6 bit 5 full scale range (lux) t int = 6.25 ms d count = 233 t int = 25 ms d count = 931 t int = 50 ms d count = 1861 t int = 100 ms d count = 3723 0 0 0 ~ 500 2.15 0.54 0.27 0.13 0 1 0 ~ 1000 4.29 1.07 0.54 0.27 1 0 0 ~ 5000 21.46 5.37 2.69 1.34 1 1 0 ~ 2500 10.73 2.68 1.34 0.67 table 23: adc t int , range and resolution @ adc clock = 10.24 khz resolution in lux /count bit 6 bit 5 full scale range (lux) t int = 25 ms d count = 233 t int = 100 ms d count = 931 t int = 200 ms d count = 1861 t int = 400 ms d count = 3723 0 0 0 ~ 500 2.15 0.54 0.27 0.13 0 1 0 ~ 1000 4.29 1.07 0.54 0.27 1 0 0 ~ 5000 21.46 5.37 2.69 1.34 obsolete downloaded from: http:///
lx1977 p roduction d atasheet microsemi analog mixed signal group 11861 western avenue, garden grove, ca. 92841, 714-898-8121, fax: 714-893-2570 page 14 smbus ambient light sensor www. microsemi . com tm ? l l x x 1 1 9 9 7 7 7 7 copyright ? 2010 rev. 1.0, 2010-03-25 1 1 0 ~ 2500 10.73 2.68 1.34 0.67 when range is selected, the d count values with different input lux will also change. please refer to the ec table for the values of 0 ~ 500 lux, 0 ~ 1000 lux, 0 ~ 5000 and 0 ~ 2500 lux light input. the equations for calculating between d count and lux are shown below. t int _set (bit 4, 3, r / w): adc integration (conversion) time control. the relationship between bit settings and integration times are shown in table below. table 24: als adc integration time conversion time / reading register 00h, bit 3 = 0, adc clock = 40.96khz register 00h, bit 3 = 1, adc clock = 10.24khz bit 4 bit 3 integration time nominal full range reading max reading integration time nominal full range reading max reading 0 0 6.25 ms 233 255 25 ms 233 255 0 1 25 ms 931 1023 100 ms 931 1023 1 0 50 ms 1861 2047 200 ms 1861 2047 1 1 100 ms 3723 4095 400 ms 3723 4095 light input lux and d count calculation: lx1977 output d count is in a linear relationship with the light input lux. d count full scale values are determined by integration time as shown above . in the electrical characteristics table, d count values are listed in accordance with the specified li ght input at adc clock = 40.96 khz, integr ation time = 100ms a nd at 0 ~ 500 lux, 0 ~ 1000 lux, 0 ~ 5000 lux and 0 ~ 2500 lux range. d count values are related to integration time and the measurement range selected. below ar e the conversion methods between d count and light input lux at different integration time. d count = (input (lux) / range) (nominal full range reading) refer to table 24 for example: 0 ~ 500 lux range, 100 lux input, integration time = 50ms d count = 100/500 1861 = 372 refer to table 24 for example: 0 ~ 1000 lux range, 500 lux input, integration time = 100ms d count = 500/1000 3723 = 1862 refer to table 24 int_persist_ctrl (bit 2, 1, 0, r / w): set the time duration before generating interrupt. int_ena should be set to 1 to enable the interrupt pin function. the actual time duration is determined by bit 3 of register 00h and bit 3 & 4 of this register. please refer to t int _set description. = 000, generate interrupt after adc conversion = 001, generate interrupt if adc result out of range = 010, generate interrupt if adc result out of range for 2 consecutive t int time = 011, generate interrupt if adc result out of range for 3 consecutive t int time = 100, generate interrupt if adc result out of range for 4 consecutive t int time = 101, generate interrupt if adc result out of range for 5 consecutive t int time = 110, generate interrupt if adc re sult out of range for 10 consecutive t int time obsolete downloaded from: http:///
lx1977 p roduction d atasheet microsemi analog mixed signal group 11861 western avenue, garden grove, ca. 92841, 714-898-8121, fax: 714-893-2570 page 15 smbus ambient light sensor www. microsemi . com tm ? l l x x 1 1 9 9 7 7 7 7 copyright ? 2010 rev. 1.0, 2010-03-25 = 111, generate interrupt if adc re sult out of range for 15 consecutive t int time note: (1) when int_flag of register 00h is cleared vi a smbus command after an interrupt response, the internal counter for int_persist_ctrl will be reset to 0. (2) for out-of-range conditions in the same direction, the persistence counter increments. if within the programmed t int time period, anytime an adc conversion comp letes and the result is no longer out-of-range, the count starts over. if the output result is between the thresholds (in-range), then counter resets to 0. if the value goes out of range in the other direction, the counter starts over at 1. (3) note that once the interrupt is triggered an d the int pin is asserted low, the int pin will stay low until int_flag bit is set to zero or int_ena is set to 0. (4) generating an interrupt for x consecutive t int integration time only applies to continuous conversion mode. register 01h and write / read byte protocols application: for programming register 01h, a write byte protocol should be used. when using write byte / word protocol to send command / data to registers (including register 0 0h), bit 7 in command code field should be set to 0 to indicate this byte is for the register address. other bits (bit 6, 5 & 4) except for the register address bits (bit 3, 2, 1 & 0) need to be set to zero also. the detailed write byte / read byte protocols are shown below. note: register 01h should be set prior to register 00h in order to get meaningful als read out. table 25: write byte protocol: 1 7 1 1 bit 7 bit 6 bit 5 bit 4 bit 3 bit 2 bit 1 bit 0 1 8 1 s slave address wr a cmd_flag 0 0 0 0 0 0 1 a data byte a p 0 0 01h register 01h could be read back by th e host by using a read byte protocol . when lx1977 receives a read byte protocol, it will put register 01h data into the data byte fiel d and send the data back to the host. please see table 11 & table 19 for details. table 26: read byte protocol: 1 7 1 1 bit 7 bit 6 bit 5 bit 4 bit 3 bit 2 bit 1 bit 0 1 1 7 1 1 8 1 s slave address wr a cmd_flag 0 0 0 0 0 0 1 a s slave address rd a data byte a p 0 0 01h 1 1 examples of setting register 01h by using write byte protocol write byte protocol is shown below (only the data byte is in detail, please refer to table 26). table 27: write byte protocol: 1 7 1 1 1 bit 7 bit 6 bit 5 bit 4 bit 3 bit 2 bit 1 bit 0 1 1 s slave address wr a command code a a p 0 0 0 0 1 0 1 0 1 the above example will write data byte 15h into register 01h to set the following configurations: obsolete downloaded from: http:///
lx1977 p roduction d atasheet microsemi analog mixed signal group 11861 western avenue, garden grove, ca. 92841, 714-898-8121, fax: 714-893-2570 page 16 smbus ambient light sensor www. microsemi . com tm ? l l x x 1 1 9 9 7 7 7 7 copyright ? 2010 rev. 1.0, 2010-03-25 1) bit 7 will select the internal clock 2) bit 6 & 5 will set detectable range to 0 ~ 500 lux 3) bit 4, 3 will set the integration time or conversion time to either 50ms or 200ms depending on register 00h bit 3 setting. if bit 3 is 0, then the integration time is 50ms, otherwise it is 200ms 4) bit 2, 1 & 0 will set lx1977 to generate interrupt after d count is above the high threshold for 5 consecutive times or below the low threshold for 5 consecutive times register 01h could be read back by th e host by using read byte protocol. when lx1977 receives read byte protocol, it will put register 01 data in the data byte field and send back to host. see table 11 for details. low threshold register 02h, 03h (r / w) table 28: low threshold lower byte register 02h 7 6 5 4 3 2 1 0 bit 7 bit 6 bit 5 bit 4 bit 3 bit 2 bit 1 bit 0 read / write read / write read / write read / write read / write read / write read / write read / write table 29: low threshold higher 4 bits register 03h 7 6 5 4 3 2 1 0 0 0 0 0 bit 11 bit 10 bit 9 bit 8 n / a n / a n / a n / a read / write read / write read / write read / write index address = 00000010b, 00000011b or 02h, 03h access = read / write default = 00000000b, 00000000b these two registers set the low threshold value of the interrupt function. if the als readout d count is lower than this value for the period of time set per int_persist_ctrl ( register 01h bit 2, 1, 0 ) , the int_flag will be set to 1 and if the int_ena is 1, the int pin will be pulled low to indicate an interrupt on the int pin. for example, if int_ena is set to 1 and int_persist_ctrl = 101 and the integration time is set to 100ms, and if the d count value is lower than this register value for consecutive five times, i.e. 5 x 100 = 500ms, then an interrupt flag int_flag will be set and if int_ena = 1 , the int pin will be asserted low. if the int_persist_ctrl programmed time period is not reached and a new d count value is between this low threshold value and the high threshold value, the counter for int_persist_ctrl will be reset to zero. if the int_persist_ctrl programmed time period is not reached and a new d count value is greater than the high threshold value, the counter starts over at 1. bit 7 to bit 4 in register 03h are always zero and can not be changed. high threshold register 04h, 05h (r / w) table 30: high threshold lower byte register 04h 7 6 5 4 3 2 1 0 bit 7 bit 6 bit 5 bit 4 bit 3 bit 2 bit 1 bit 0 read / write read / write read / write read / write read / write read / write read / write read / write table 31: high threshold higher 4 bits register 05h 7 6 5 4 3 2 1 0 0 0 0 0 bit 11 bit 10 bit 9 bit 8 n / a n / a n / a n / a read / write read / write read / write read / write obsolete downloaded from: http:///
lx1977 p roduction d atasheet microsemi analog mixed signal group 11861 western avenue, garden grove, ca. 92841, 714-898-8121, fax: 714-893-2570 page 17 smbus ambient light sensor www. microsemi . com tm ? l l x x 1 1 9 9 7 7 7 7 copyright ? 2010 rev. 1.0, 2010-03-25 index address = 00000100b, 00000101b or 04h, 05h access = read / write default = 11111111b, 00001111b these two registers set the high threshold value of the interrupt function. if the als readout d count is higher than this value for the period of time set per int_persist_ctrl ( register 01h bit 2, 1, 0 ) , the int_flag will be set to 1 and if the int_ena is 1, the int pin will be pulled low to indicate an interrupt on the int pin. for example, if int_persist_ctrl = 101 and the integration time is set to 100ms, and if the d count value is higher than this register value for consecutive five time s, i.e. 5 x 100 = 500ms, then an interrupt flag int_flag will be set and if int_ena = 1 , the int pin will be asserted low. if the int_persist_ctrl programmed time period is not reached and a new d count value is between the low threshold value and this high threshold value, the counter for int_persist_ctrl will be reset to zero. if the int_persist_ctrl programmed time period is not reached and a new d count value is lower than low threshold value, the counter starts over at 1. bit 7 to bit 4 in register 05h are always zero and can not be changed. als adc data register 06h, 07h (r) table 32: als adc d count lower byte register 06h 7 6 5 4 3 2 1 0 data bit 7 data bit 6 data bit 5 data bit 4 data bit 3 data bit 2 data bit 1 data bit 0 table 33: als adc d count higher byte register 07h 7 6 5 4 3 2 1 0 0 0 0 0 data bit 11 data bit 10 data bit 9 data bit 8 index address = 00000110b, 00000111b or 06h, 07h access = read only default = 00000000h, 00000000h after each adc conversion, the adc output data will be stored in registers 06h and 07h. once the data is stored, the adc will start another conversion again. note that registers 06h an d 07h act as a buffer between the adc output counter and the smbus interface. therefore, even when an adc conversion is in process, the last conversion result will still be available in th e registers to read. note that for the purpose of adc data integrity control, when t int is greater than 6.25ms (in 40.96khz mode), or t int is greater than 25ms (in 10.24khz mode), read word protocol should be used to read the two bytes of adc data. if data is read by using read byte protocol two consecutive times to read register 06h and 07h sequentially, the data in these re gisters might be updated before the time of executing the second read byte protocol. thus, the second read byte may not co rrespond to the original value when t int is set to 6.25ms (in 40.96khz mode) or 25ms (in 10.24 khz mode), read byte protocol could be u sed to read out the lower byte to reduce the communication time. since for these integration times, the adc results will be always less or equal to 255 and only data in register 06h will be relevant. the adc result is updated per the integration time set by t int _set (register 01h, bit 4, 3) when adc is enabled by start_adc (register 00h, bit 5). these two registers can be read any time even while the adc conversion is in pr ocess. when an adc conversion is in process, the read data will correspond to the last conversion result. obsolete downloaded from: http:///
lx1977 p roduction d atasheet microsemi analog mixed signal group 11861 western avenue, garden grove, ca. 92841, 714-898-8121, fax: 714-893-2570 page 18 smbus ambient light sensor www. microsemi . com tm ? l l x x 1 1 9 9 7 7 7 7 copyright ? 2010 rev. 1.0, 2010-03-25 identification register 08h (r) table 34: identification register 08h 7 6 5 4 3 2 1 0 mfg4 mfg3 mfg2 mfg1 mfg0 rev2 rev1 rev0 0 0 0 0 1 1 0 0 index address = 00001000b or 08h access = read only default = 00001100b obsolete downloaded from: http:///
lx1977 p roduction d atasheet microsemi analog mixed signal group 11861 western avenue, garden grove, ca. 92841, 714-898-8121, fax: 714-893-2570 page 19 smbus ambient light sensor www. microsemi . com tm ? l l x x 1 1 9 9 7 7 7 7 copyright ? 2010 rev. 1.0, 2010-03-25 als d cou n t v s li gh t i n pu t als d cou n t v s li gh t i n pu t lx1977 d count vs lux @ fosc=40.96khz, t int =6.25ms vcc = 3.3v 0 25 50 75 100 125 150 175 200 225 250 0 1000 2000 3000 4000 5000 6000 lux input 0 ~ 500 lux 0 ~ 1000 lux 0 ~ 5000 lux 0 ~ 2500 lux chart 1 C d count vs light input, tint=6.25ms @ different range lx1977 d count vs lux @ fosc=40.96khz, t int =100ms vcc = 3.3v 0 1000 2000 3000 4000 0 1000 2000 3000 4000 5000 6000 lux input 0 ~ 500 lux 0 ~ 1000 lux 0 ~ 5000 lux 0 ~ 2500 lux chart 2 C d count vs light input, tint=100ms @ different range als d cou n t v s li gh t i n pu t als d cou n t v s li gh t i n pu t lx1977 d count vs lux @ fosc=40.96khz, 0~500 lux range, vcc = 3.3v 0 1000 2000 3000 4000 0 50 100 150 200 250 300 350 400 450 500 lux input tint=6.25ms tint=25ms tint=50ms tint=100ms chart 3 C d count vs light input @ different t int for 0 ~ 500 lux range lx1977 d count vs lux @ fosc=40.96khz, 0~5000 lux range, vcc = 3.3v 0 1000 2000 3000 4000 0 500 1000 1500 2000 2500 3000 3500 4000 4500 5000 lux input tint=6.25ms tint=25ms tint=50ms tint=100ms chart 4 C d count vs light input @ different t int for 0 ~ 1000 lux range obsolete downloaded from: http:///
lx1977 p roduction d atasheet microsemi analog mixed signal group 11861 western avenue, garden grove, ca. 92841, 714-898-8121, fax: 714-893-2570 page 20 smbus ambient light sensor www. microsemi . com tm ? l l x x 1 1 9 9 7 7 7 7 copyright ? 2010 rev. 1.0, 2010-03-25 als, spect ral respon se d cou n t v s t em p spectral response 0.0 0.2 0.4 0.6 0.8 1.0 300 350 400 450 500 550 600 650 700 750 800 wavelength (nm) detector irradiance response [a/(w/cm^2)] eye lx1977 chart 5 C als spectral response lx1977 temperature performance (100ms, 0~500 lux range, 200 lux input, vcc=3.3v) -1.00 -0.75 -0.50 -0.25 0.00 0.25 0.50 0.75 1.00 -60 -40 -20 0 20 40 60 80 100 temp (c) % deviation from output at room temp 100ms chart 6 C d count vs temperature als d cou n t v s v dd i dd v s t em p d count vs. v cc (100ms, 500 lux range, 200 lux input) -5 -4 -3 -2 -1 0 1 2 3 4 5 2 . 533 . 544 . 55 v cc (v) % change from 3.3v chart 7 C als output d count vs supply voltage supply current vs temperature (0~500 lux range, 100ms, 200 lux input, vcc=3.3v) 30 50 70 90 110 130 -60 -40 -20 0 20 40 60 80 100 temp (c) supply current (ua) chart 8 C device supply current vs temperature als, an gu lar respon se als, an gu lar respon se angular response - x direction 0% 10% 20% 30% 40% 50% 60% 70% 80% 90% 100% -90 -80 -70 -60 -50 -40 -30 -20 -10 0 10 20 30 40 50 60 70 80 90 angle chart 9 C angular response x direction angular response - y direction 0% 10% 20% 30% 40% 50% 60% 70% 80% 90% 100% -90 -80 -70 -60 -50 -40 -30 -20 -10 0 10 20 30 40 50 60 70 80 90 angle chart 10 C angular response y direction obsolete downloaded from: http:///
lx1977 p roduction d atasheet microsemi analog mixed signal group 11861 western avenue, garden grove, ca. 92841, 714-898-8121, fax: 714-893-2570 page 21 smbus ambient light sensor www. microsemi . com tm ? l l x x 1 1 9 9 7 7 7 7 copyright ? 2010 rev. 1.0, 2010-03-25 t y pi cal appli cat i on figure 5 C typical application 1 dac/adc lx1800 part scl scd gnd adr v dd ain ref aout 2.5v cclf or led backlight controller brt to p 0.1f v cc part lx1977 sda v ss v dd scl int adr r set r set 267k, %1 figure 6 C typical application 2 obsolete downloaded from: http:///
lx1977 c c o o n n f f i i d d e e n n t t i i a a l l microsemi analog mixed signal group 11861 western avenue, garden grove, ca. 92841, 714-898-8121, fax: 714-893-2570 page 22 copyright ? 2010 rev. 1.0, 2010-03-25 (smbus) ambient light sensor www. microsemi . com tm ? l l x x 1 1 9 9 7 7 7 7 pack age di m en si on s du glass top 8-pin msop m illimeters i nches dim min max min max a C 1.10 C 0.043 a1 0.05 0.15 0.002 0.006 b 0.26 0.41 0.010 0.016 c 0.13 0.23 0.005 0.009 d 2.90 3.10 0.114 0.122 e 0.65 bsc 0.025 bsc e 4.75 5.05 0.187 0.198 e1 2.90 3.10 0.114 0.122 l 0.41 0.71 0.016 0.028 l1 0.95 bsc 0.037 bsc s 0.525 bsc 0.021 bsc 3 3 note: 1. dimensions do not include mo ld flash or protrusions; these shall not exceed 0.155mm(.006) on any side. lead dimension shall not include solder coverage. m illimeters mils dim typ typ a 0.76 30 b 0.5 20 z 0.2 7.8 note: 1. cl represents the centered x and y axis of the package. 2. z is the vertical offset from the x axis that centers the glass top window. 3. a and b are the dimensions of the glass top window. 4. values listed in the table are typical numbers. obsolete downloaded from: http:///
lx1977 c c o o n n f f i i d d e e n n t t i i a a l l microsemi analog mixed signal group 11861 western avenue, garden grove, ca. 92841, 714-898-8121, fax: 714-893-2570 page 23 copyright ? 2010 rev. 1.0, 2010-03-25 (smbus) ambient light sensor www. microsemi . com tm ? l l x x 1 1 9 9 7 7 7 7 pack age t ape an d reel i n form at i on 4mm 0.1 8mm 0.1 5.5mm 0.1 2mm 0.1 12mm 0.3 5.3mm 0.1 ? 1.55mm 0.05 ? 1.6mm 0.1 ref 3.3mm 0.1 3.3mm 0.1 1.3mm 0.1 1.0mm 0.1 0.3mm 0.05 0.15mm ref 0.4mm pin 1 du package tape and reel information production data C information contained in this document is proprietary to microsemi and is current as of publication date. this document may not be modified in any way without the express written consent of microsemi. product processing does not necessarily include testing of all parameters. microsemi reserves the right to change the configuration and performance of the product and to discontinue product at any time. obsolete downloaded from: http:///

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