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lite-on dcc release lite-on technology corp. / optoelectronics no.90,chien 1 road, chung ho, new taipei city 23585, taiwan, r.o.c. tel: 886-2-2222-6181 fax: 886-2-2221-1948 / 886-2-2221-0660 http://www.liteon.com/opto optical sensor product data sheetLTR-303ALS-01 spec no.: ds86-2013-0004effective date: 07/09/2014revision: a bns-od-fc001/a4 bns-od-fc001/a4 bns-od-fc001/a4 bns-od-fc001/a4
1 / 31 p art no. : l t r - 303als - 01 bns - od - fc002/a4 optical sensor l tr - 303als - 01 1. description the ltr - 303als - 01 is a low voltage i 2 c digital light sensor [als] in a low cost miniature chipled lead - free surface mount package. this sensor converts light intensity to a digital output signal capable of direct i 2 c interface. it provides a linear response over a wide dynamic range from 0.01 lux to 64k lux and is well suited to applications under high ambient brightness. there are altogether six gain settings (1x, 2x, 4x, 8x, 48x and 96x) available for user to configure. the sensor suppo rts an interrupt feature that removes the need to poll the sensor for a reading which improves system efficiency. the sensor also supports several features that help to minimize the occurrence of false triggering. this cmos design and factory - set one time trimming capability ensure minimal sensor - to - sensor variations for ease of manufacturability to the end customers. 2 . features ? i 2 c interface (fast mode @ 400kbit/s) ? ultra - small 6 - pin chipled package ? 2.0mm(l), 2.0mm(b), 0.7mm(h) ? built - in temperature co mpensation circuit ? low active power consumption with standby mode ? supply voltage range from 2.4v to 3.6v capable of 1.7v logic voltage ? operating temperature range from - ? rohs and halogen free compliant ? close to human eye spectral response ? immu nity to ir / uv light source ? automatically rejects 50 / 60 hz lightings flicker ? full dynamic range from 0.01 lux to 64k lux ? 16 - bit effective resolution
2 / 31 p art no. : l t r - 303als - 01 bns - od - fc002/a4 optical sensor l tr - 303als - 01 3 . applications ? back - lighting control in mobile/portable devices ? touch panel control in mobile/po rtable devices 4 . ordering information part number packaging type package quantity ltr - 303als - 01 tape and reel 6 - pin chipled package 25 00 5 . outline dimensions
3 / 31 p art no. : l t r - 303als - 01 bns - od - fc002/a4 optical sensor l tr - 303als - 01 6 . functional block diagram 7 . application circuit
4 / 31 p art no. : l t r - 303als - 01 bns - od - fc002/a4 optical sensor l tr - 303als - 01 i/o pins configu ration table pin i/o type symbol description 1 vdd power supply voltage 2 nc no connection to this pin 3 gnd ground 4 i scl * i 2 c serial clock. this pin is an open drain input. 5 o int* level interrupt pin. this pin is an open drain output. 6 i/o s da * i 2 c serial data. this pin is an open drain input / output. * note: for noisy environment, add 10pf capacitor from signal to gnd for additional noise filtering. recommended application circuit components component recommended value rp1, rp2, rp3 [1 ] 1 k ? to 10 k ? c1 1uf ? 20%, x7r / x5r ceramic [1] selection of pull - up resistors value is dependent on bus capacitance values. for more details, please refer to i 2 c specifications: http://www.nxp.com/documents/user_manual/um10204.pdf
5 / 31 p art no. : l t r - 303als - 01 bns - od - fc002/a4 optical sensor l tr - 303als - 01 8 . ratings and s pecifications absolute maximum ratings at ta = 25 ? c parameter symbol rating unit supply voltage vdd 3.8 v digital voltage range scl, sda, int - 0.5 to 3.8 v digital output current scl, sda, int - 1 to 20 ma storage temperature t stg - 40 to 100 ? c note: exceeding these ratings could cause damage to the sensor. all voltages are with respect to ground. currents are positive into, negative out of the specified terminal. recommended operating conditions description symbol min. typ. max. unit supply voltage vdd 2.4 3.6 v interface bus power supply voltage v io 1.7 3.6 v i 2 c bus input pin high voltage v ih scl, v ih sda 1.2 v i 2 c bus input pin low voltage v il scl, v il sda 0.6 v operating temperature t ope - 30 70 ? c electrical & optical specifications all specifications are at vdd = 3.0v, t op e = 25 ? c, unless otherwise noted. parameter min. typ. max. unit condition active supply current 2 2 0 ua active mode, t ope = 25 ? c , vdd=3.6v integration time : 100ms measurement rate : 200ms standby current 5 ua standby / sleep mode initial startup time 10 0 ms (note 1) wakeup time from standby 10 ms (note 1)
6 / 31 p art no. : l t r - 303als - 01 bns - od - fc002/a4 optical sensor l tr - 303als - 01 light sensor parameter min. typ. max. unit condition full scale adc count 65535 count dark adc count 0 6 count ch0, lux = 0 0 6 count ch1, lux = 0 adc count (gain=96) @200lux 3250 6100 count ch0 (see note 2) white led 200 lux integration time : 50ms measurement time : 100ms 1050 1950 count ch1 (see note 2) white led 200 lux integration time : 50ms measurement time : 100ms 0.15 0. 35 ratio ch1/(ch0 + ch1) notes: 1. startup sequence 2. liteon white led color temperature 10000k. supply vdd to sensor ( sensor in standby mode) i2c command (write) to enable sensor to active mode wait at least 100 ms - initial startup time se nsor is active and starts measurement wait at least 10 ms - wakeup time from standby
7 / 31 p art no. : l t r - 303als - 01 bns - od - fc002/a4 optical sensor l tr - 303als - 01 typical performance curve all specifications are at vdd = 3.0v, t ope = 25 ? c, unless otherwise noted. figure 1: normalized spectral response figure 2 : viewing angle
8 / 31 p art no. : l t r - 303als - 01 bns - od - fc002/a4 optical sensor l tr - 303als - 01 figure 3 : vdd versus average idd figure 4 : average idd versus temperature
9 / 31 p art no. : l t r - 303als - 01 bns - od - fc002/a4 optical sensor l tr - 303als - 01 figure 5 : output count ratio versus temperature lux formula refer to appendix a for the lux formula
10 / 31 p art no. : l t r - 303als - 01 bns - od - fc002/a4 optical sensor l tr - 303als - 01 ac electrical characteristics all specifications are at vbus = 1.8v, t ope = 25 ? c, unless otherwise noted. parameter symbol min. max. unit scl clock frequency 1 400 khz bus free time between a stop and start condition 1.3 u s hold time (repeated) start condition. after this period, the first clock pulse is generated 0.6 u s low period of the scl clock 1.3 u s high period of the scl clock 0.6 u s set - up time for a repeated start condition 0.6 u s set - up time for stop condition 0.6 u s rise time of both sda and scl signals 30 300 ns fall time of both sda and scl signals 30 300 ns data hold time 0.3 0.9 u s data setup time 100 n s pulse width of spikes which must be suppressed by the input filter 0 50 ns definition of timing for i 2 c bus scl f buf t s ta hd t ; low t high t s ta su t ; s to su t ; r t f t d at hd t ; d at su t ; sp t
11 / 31 p art no. : l t r - 303als - 01 bns - od - fc002/a4 optical sensor l tr - 303als - 01 9 . principles of operation i 2 c protocols i 2 c write protocol (type 1): i 2 c write protocol (type 2): i 2 c read protocol: s l a v e a d d r e s s w a s r e g i s t e r a d d r e s s a p 7 1 1 1 8 1 1 s l a v e i d ( w r i t e ) s c l 1 2 3 4 5 6 7 8 9 s d a s 6 s 5 s 4 s 3 s 2 s 1 s 0 1 2 3 4 5 6 7 8 9 a 7 a 6 a 5 a 4 a 3 a 2 a 1 a 0 s l a v e a d d r e s s r e g i s t e r a d d r e s s a a s p w s l a v e i d ( w r i t e ) s l a v e a d d r e s s w a s r e g i s t e r a d d r e s s a p 7 1 1 1 8 1 1 r e g i s t e r c o m m a n d a 8 1 s l a v e i d ( w r i t e ) s c l 1 2 3 4 5 6 7 8 9 s d a s 6 s 5 s 4 s 3 s 2 s 1 s 0 1 2 3 4 5 6 7 8 9 a 7 a 6 a 5 a 4 a 3 a 2 a 1 a 0 s l a v e a d d r e s s r e g i s t e r a d d r e s s a a s 1 2 3 4 5 6 7 8 9 a 7 a 6 a 5 a 4 a 3 a 2 a 1 a 0 r e g i s t e r c o m m a n d a p w s l a v e i d ( w r i t e ) s 1 s l a v e a d d r e s s r a n 7 1 1 8 1 r e g i s t e r c o m m a n d p 1 s l a v e i d ( r e a d ) s c l 1 2 3 4 5 6 7 8 9 s d a s 6 s 5 s 4 s 3 s 2 s 1 s 0 1 2 3 4 5 6 7 8 9 c 7 c 6 c 5 c 4 c 3 c 2 c 1 c 0 s l a v e a d d r e s s r e g i s t e r c o m m a n d a n s p r s l a v e i d ( r e a d )
12 / 31 p art no. : l t r - 303als - 01 bns - od - fc002/a4 optical sensor l tr - 303als - 01 i 2 c read (combined format) protocol: a acknowledge (0 for an ack) n non - acknowledge(1 for an nack) s start condition sr repeated start condition p stop condition w write (0 for writing) r r ead (1 for read) slave - to - master master - to - slave i 2 c slave address the 7 bits slave address for this sensor is 0x29 h. a read/write bit should be appended to the slave address by the master devi ce to properly communicate with the sensor. i 2 c slave address command type (0x29 h) w/r value bit7 bit6 bit5 bit4 bit3 bit2 bit1 bit0 write 0 1 0 1 0 0 1 0 0x52 h read 0 1 0 1 0 0 1 1 0x53 h s l a v e a d d r e s s w a s r e g i s t e r a d d r e s s a s r 7 1 1 1 8 1 1 s l a v e a d d r e s s r a n 7 1 1 8 1 r e g i s t e r c o m m a n d p 1 s l a v e i d ( w r i t e ) s l a v e i d ( r e a d ) s c l 1 2 3 4 5 6 7 8 9 s d a s 6 s 5 s 4 s 3 s 2 s 1 s 0 1 2 3 4 5 6 7 8 9 a 7 a 6 a 5 a 4 a 3 a 2 a 1 a 0 s l a v e a d d r e s s r e g i s t e r a d d r e s s a a s s r w 1 2 3 4 5 6 7 8 9 c 7 c 6 c 5 c 4 c 3 c 2 c 1 c 0 r e g i s t e r c o m m a n d a n p 1 2 3 4 5 6 7 8 9 s 6 s 5 s 4 s 3 s 2 s 1 s 0 s l a v e a d d r e s s a r
13 / 31 p art no. : l t r - 303als - 01 bns - od - fc002/a4 optical sensor l tr - 303als - 01 register set addr r / w register name description reset value 0x80 r / w als_contr als operation mode control sw reset 0x00 0x85 r / w als_meas_rate als measurement rate in active mode 0x01 0x86 r part_id part number id and revision id 0xa0 0x87 r manufac_id manufacturer id 0x05 0x88 r als_data_ch1_0 als m easurement ch1 data, lower byte 0x00 0x89 r als_data_ch1_1 als measurement ch1 data, upper byte 0x00 0x8a r als_data_ch0_0 als measurement ch0 data, lower byte 0x00 0x8b r als_data_ch0_1 als measurement ch0 data, upper byte 0x00 0x8c r als_status als n ew data status 0x00 0x8f r/w interrupt interrupt settings 0x08 0x97 r/w als_thres_up_0 als interrupt upper threshold, lower byte 0xff 0x98 r/w als_thres_up_1 als interrupt upper threshold, upper byte 0xff 0x99 r/w als_thres_low_0 als interrupt lower th reshold, lower byte 0x00 0x9a r/w als_thres_low_1 als interrupt lower threshold, upper byte 0x00 0x9e r/w interrupt persist als interrupt persist setting 0x00 notes: 1) when reading als data registers, read sequence should always be from lower address t o higher address (e.g. for als data, ch1 data should be read first followed by ch0 data. read sequence should be 0x88, 0x89, 0x8a, 0x8b. when 0x8b is read, all four als data registers will be populated with new set of data). 2) when setting of interrupt regi ster (addr 0x8f) is necessary, it should be done before the device is in active mode .
14 / 31 p art no. : l t r - 303als - 01 bns - od - fc002/a4 optical sensor l tr - 303als - 01 als_contr register (0x80) the als_contr register controls the als gain setting, als operation modes and software (sw) reset for the sensor. the als sensor can be set to either standby mode or active mode. at either of these modes, the i 2 c circuitry is always active. the default mode after power up is standby mode. during standby mode, there is no als measurement performed but i 2 c communication is allowed to enable read/write to all the registers field bits default type description reserved 7:5 000 -- -- must write to 000 (default) als gain 4:2 000 rw 000 gain 1x ? 1 lux to 64k lux (default) 001 gain 2x ? 0.5 lux to 32k lux 010 gain 4x ? 0.25 lux to 16k lux 011 gain 8x ? 0.125 lux to 8k lux 100 reserved 101 reserved 110 gain 48x ? 0.02 lux to 1.3k lux 111 gain 96x ? 0.01 lux to 600 lu x sw reset 1 0 rw 0 initial start - up procedure is not started (default) 1 initial start - up procedure is started, bit has default value of 0 after start - up als mode 0 0 rw 0 stand - by mode (default) 1 active mode 0x80 als_contr (default = 0x00) b7 b6 b5 b4 b3 b2 b1 b0 reserved als gain sw reset als mode
15 / 31 p art no. : l t r - 303als - 01 bns - od - fc002/a4 optical sensor l tr - 303als - 01 als_meas_rate register (0x85) the als_meas_rate register controls the integration time and timing of the periodic measurement of the als in active mode. als measurement repeat rate is the interval between als_data registers update. als integration time is the measurement time for each als cycle. als integration time must be set to be equal or smaller than the als measurement repeat rate. if als integration time is set to be bigger than als measurement repeat rate, it will be automatically reset to be equal to als measurement repeat rat e by the ic internally. field bits default type description reserved 7:6 00 -- -- -- als integration time 5:3 000 rw 000 100ms (de fault) 001 50ms 010 200ms 011 400ms 100 150ms 101 250ms 110 300ms 111 350ms als measurement rate 2:0 011 rw 000 50ms 001 100ms 010 200ms 011 500ms (default) 100 1000ms 101 2000ms 110 1 11 0x85 als_meas_rate (default = 0x03) b7 b6 b5 b4 b3 b2 b1 b0 reserved als integration time als measurement repeat rate
16 / 31 p art no. : l t r - 303als - 01 bns - od - fc002/a4 optical sensor l tr - 303als - 01 part_id register (0x86) (read only) the part_id register defines the part number and revision identification of the sensor. field bits default type description pa rt number id 7:4 1010 r part id 0x0ah revision id 3:0 0000 r revision id 0x00h manufac_id register (0x87) (read only) the manufac_id register defines the manufacturer identification of the sensor. field bits default type description manufacturer id 7:0 00000101 r manufacturer id (0x05h) 0x86 part_id (default = 0x a0 ) b7 b6 b5 b4 b3 b2 b1 b0 part number id revision id 0x87 manufac_id (default = 0x05) b7 b6 b5 b4 b3 b2 b 1 b0 manufacturer id
17 / 31 p art no. : l t r - 303als - 01 bns - od - fc002/a4 optical sensor l tr - 303als - 01 als_data_ch1 register (0x88 / 0x89) (read only) the als_data registers should be read as a group, with the lower address read back fir st (i.e. read 0x88 first, then read 0x89). these two registers should also be read before reading channel - 0 data (from registers 0x8a, 0x8b). when the i 2 c read operation starts, all four als data registers are locked until the i 2 c read operation of regist er 0x8b is completed. this will ensure that the data in the registers is from the same measurement even if an additional integration cycle ends during the read operation. new measurement data is stored into temporary registers and the als_data registers ar e updated as soon as there is no on - going i 2 c read operation. the als adc channel - 1 data is expressed as a 16 - bit data spread over two registers. the als_data_ch1_0 and als_data_ch1_1 registers provide the lower and upper byte respectively . field addr ess bits default type description als data ch1 low 0x88 7:0 00000000 r als adc channel 1 l ower byte data als data ch1 high 0x89 7:0 00000000 r als adc channel 1 upper byte data 0x88 als_data_ ch1_0 (default = 0x00) b7 b6 b5 b4 b3 b2 b1 b0 als data ch1 low 0x89 als_data_ch1_1 (default = 0x00) b7 b6 b5 b4 b3 b2 b1 b0 als data ch1 high
18 / 31 p art no. : l t r - 303als - 01 bns - od - fc002/a4 optical sensor l tr - 303als - 01 als_data_ch0 register (0x8a / 0x8b) (read only) these two registers should be read after reading channel - 1 data (from registers 0x88, 0x89). lower address register should be read first (i.e . read 0x8a first, then read 0x8b). see als_data_ch1 register information above. the als adc channel - 0 data is expressed as a 16 - bit data spread over two registers. the als_data_ch0_0 and als_data_ch0_1 registers provide the lower and upper byte respectively . field addr ess bits default type description als data ch0 low 0x8a 7:0 00000000 r als adc channel 0 lower byte data als data ch0 high 0x8b 7:0 00000000 r als adc channel 0 upper byte data 0x8a als_data_ch0_0 (default = 0x00) b7 b6 b5 b4 b3 b2 b1 b0 als data ch0 low 0x8b als_data_ch0_1 (default = 0x00) b7 b6 b5 b4 b3 b2 b1 b0 als data ch0 high
19 / 31 p art no. : l t r - 303als - 01 bns - od - fc002/a4 optical sensor l tr - 303als - 01 als_ status register (0x8c) (read only) the als_status register stores the information about als data status. new data means data has not been read yet. when the measurement is completed and data is written to the data register, the data status bit will be set to logic 1. when the data register is read, the data status bit will be set to logic 0 . interrupt status dete rmines if the als interrupt criteria are met. it will check if the als measurement data is outside of the range defined by the upper and lower threshold limits. field bits default type description als data valid 7 0 r 0 als data is valid (default) 1 als data is invalid als data gain range 6:4 000 r 000 als measured data in gain 1x (default) 001 als measured data i n gain 2x 010 als measured data in gain 4x 011 als measured data in gain 8x 100 invalid 101 invalid 110 als measured data in gain 48x 111 als measured data in gain 96x als interrupt status 3 0 r 0 interrupt signal inactive (d efault) interrupt signal active als data status 2 0 r 0 old data (data already read), ( default) 1 new data (first time data is being read) reserved 1:0 00 r -- dont care 0x8c als _status (default = 0x00) b7 b6 b5 b4 b3 b2 b1 b0 als data valid als gain als inter rupt status als data status reserved
20 / 31 p art no. : l t r - 303als - 01 bns - od - fc002/a4 optical sensor l tr - 303als - 01 interrupt register (0x8f) (read only) the interrupt register controls the operation of the interrupt pin and functions. when the interrupt mode is set to 00, the int output pin 2 is inactive / disabled and will not trigger any interrupt. note that when this register is to be set with values other than its default values, it should be set before device is in active mode . field bits default type description reserved 7:3 00001 -- -- must write as 00000 bit b3 is 1 (default) but it has no impact on performance interrupt polarity 2 0 r w 0 int pin is considered active when it is a logic 0 (default) 1 int pin is considered active when it is a logic 1 interrupt mode 1 0 r w 0 interrupt pin is inactive / high imp edance state (default) 1 als measurement can trigger interrupt reserved 0 0 -- -- dont care 0x8f interrupt (default = 0x08) b7 b6 b5 b4 b3 b2 b1 b0 reserved interrupt polarity interrupt mode reserved
21 / 31 p art no. : l t r - 303als - 01 bns - od - fc002/a4 optical sensor l tr - 303als - 01 als_ thres register (0x97 / 0x98 / 0x99 / 0x9a) the als_thres_up and als_thres_low registers determines the upper and lower limit of the interrupt thr eshold value respectively. these two values form a range and the interrupt function compares if the measurement value in als_data registers is inside or outside the range. the interrupt function is active if the measurement data is outside the range define d by the upper and lower limits. the data format for als_thres must be the same as als_data registers. field address bits default type descripti on als upper threshold low 0x97 7:0 11111111 r w als upper threshold lower byte data als upper threshold high 0x98 7:0 11111111 r w als upper threshold up per byte data als lower threshold low 0x99 7:0 00000000 rw als lower threshold lower byte data als l ower threshold high 0x9a 7:0 00000000 rw als lower threshold upper byte data 0x97 als_thres_up_0 (default = 0xff) b7 b6 b5 b4 b3 b2 b1 b0 als upper threshold low 0x9 8 als_ thres _ up _1 (default = 0x ff ) b7 b6 b5 b4 b3 b2 b1 b0 als upper threshold high 0x99 als_thres_low_0 (default = 0x00) b7 b6 b5 b4 b3 b2 b1 b0 als lower threshold low 0x9a als_thres_low_1 (default = 0x00) b7 b6 b5 b4 b3 b2 b1 b0 als lower threshold high
22 / 31 p art no. : l t r - 303als - 01 bns - od - fc002/a4 optical sensor l tr - 303als - 01 interrupt persist register (0x9e) the interrupt persist register controls the n number of times the measurement data is outside the range defined by the upper and lower threshold limits before asserting the int output pin 2. field bits default type description reserved 7:4 0000 -- dont care als persist 3:0 0000 rw 0000 every als value ou t of threshold range (default) 0001 2 consecutive als values out of threshold range --- --- 1111 16 consecutive als values out of threshold range 0x9e interrupt persist (default = 0x00) b7 b6 b5 b4 b3 b2 b1 b0 reserved als persist
23 / 31 p art no. : l t r - 303als - 01 bns - od - fc002/a4 optical sensor l tr - 303als - 01 10 . device operation(using interrupt) below flow diagram illustrates the ltr - 30 3 als operation.
24 / 31 p art no. : l t r - 303als - 01 bns - od - fc002/a4 optical sensor l tr - 303als - 01 11 . device operation(without using interrupt) below flow diagram illustrates the ltr - 303als operation without the use of interrupts.
25 / 31 p art no. : l t r - 303als - 01 bns - od - fc002/a4 optical sensor l tr - 303als - 01 1 2 . pseudo codes examples control registers // the control register defines the operating modes and gain settings of the als of ltr - 3 03 . // default settings is 0x00 (in standby mode). slave_addr = 0x29 // slave address of ltr - 3 03 device // enable als register_addr = 0x80 // als_contr register command = 0x01 // for gain x1 // for gai n x96, command = 0x1d writebyte(slave_addr, register_addr, command) als measurement rate // the als_meas_rate register controls the als integration time and measurement rate. // default setting of the register is 0x03 (integration time 100ms, repeat rat e 500ms) slave_addr = 0x29 // slave address of ltr - 3 03 device // set als integration time 200ms, repeat rate 200ms register_addr = 0x85 // als_meas_rate register command = 0x12 // int time = 200ms, meas rate = 200ms // for int time = 400ms, meas rate = 500ms, command = 0x1b writebyte(slave_addr, register_addr, command) als data registers (read only) // the als data registers contain the adc output data for the respective channel. // these registers should be read as a group, with the lower address being read first. slave_addr = 0x29 // slave address of ltr - 3 03 device // read back als_data_ch1 register_addr = 0x88 // als_data_ch1 low byte address readbyte(slave_addr, register_addr, data0) register_addr = 0x89 // als_ data_ch1 high byte address readbyte(slave_addr, register_addr, data1) // read back als_data_ch0 register_addr = 0x8a // als_data_ch0 low byte address readbyte(slave_addr, register_addr, data2) register_addr = 0x8b // als_data_ch0 high byte address readbyte(slave_addr, register_addr, data3) als_ch1_adc_data = (data1 << 8) | data0 // combining lower and upper bytes to give 16 - bit ch1 data als_ch0_adc_data = (data3 << 8) | data2 // combining lower and upper bytes to give 16 - bit ch0 data
26 / 31 p art no. : l t r - 303als - 01 bns - od - fc002/a4 optical sensor l tr - 303als - 01 als sta tus register (read only) // the als_status register contains the information on als data availability status. this register is read only. slave_addr = 0x29 // slave address of ltr - 3 03 device // read back register reg ister_addr = 0x8c // als_stat us register address readbyte(slave_addr, register_addr, data) interrupt _status = data & 0x0 8 // interrupt_status = 8(decimal) ? als interrupt newdata_status = data & 0x04 // newdata_status = 4(decimal) ? als new data als_ data_ valid = data & 0x 80 // als_data_valid = 0x00 ? als new data is valid (usable) // als_data_valid = 0x80 ? als new data is invalid, discard and wait for new als data interrupt register s // the interrupt register controls th e operation of the interrupt pins and function. // the default value for this register is 0x08 (interrupt inactive) // note that when this register is to be set with values other than its default values, // it should be set before device is in active mode . slave_addr = 0x29 // slave address of ltr - 3 03 device // set interrupt polarity for als active low trigger register_addr = 0x8f // interrupt register address command = 0x0a // interrupt is active low als trigger // for active high interrupt als trigger, command = 0x0e writebyte(slave_addr, register_addr, command) als threshold register s // the als_thres_up and als_thres_low registers determines the upper and lower limit of the interrupt threshold value. // following e xample illustrates the setting of the als threshold window of decimal values of 200 (lower threshold) // and 1000 (upper threshold) slave_addr = 0x29 // slave address of ltr - 3 03 device // upper threshold setting (decimal 1000) als_upp_threshold_reg_ 0 = 0x97 // als upper threshold low byte register address als_upp_threshold_reg_1 = 0x98 // als upper threshold high byte register address data1 = 1000 >> 8 // to convert decimal 1000 into two eight bytes register values data0 = 1000 & 0xff writeb yte(slave_addr, als_upp_threshold_reg_0, data0) writebyte(slave_addr, als_upp_threshold_reg_1, data1) // lower threshold setting (decimal 200) als_low_threshold_reg_0 = 0x99 // als lower threshold low byte register address als_low_threshold_reg_1 = 0x9a // als lower threshold high byte register address data1 = 200 >> 8 // to convert decimal 200 into two eight bytes register values data0 = 200 & 0xff writebyte(slave_addr, als_low_threshold_reg_0, data0) writebyte(slave_addr, als_low_threshold_reg_1 , data1) writebyte(slave_addr, als_upp_threshold_reg_1, data1)
27 / 31 p art no. : l t r - 303als - 01 bns - od - fc002/a4 optical sensor l tr - 303als - 01 1 3 . recommended leadfree reflow profile process zone symbol ? t maximum ? t/ ? time or duration heat up p1, r1 25 ? c to 150 ? c 3 ? c/s solder paste dry p2, r2 150 ? c t o 200 ? c 100s to 180s solder reflow p3, r3 p3, r4 200 ? c to 260 ? c 260 ? c to 200 ? c 3 ? c/s - 6 ? c/s cool down p4, r5 200 ? c to 25 ? c - 6 ? c/s time maintained above liquidus point , 217 ? c > 217 ? c 60s to 90s peak temperature 260 ? c - time within 5 ? c of actual peak temperature > 255 ? c 20s time 25 ? c to peak temperature 25 ? c to 260 ? c 8mins it is recommended to perform reflow soldering no more than twice. 50 100 150 200 250 300 t-time (seconds) 25 80 120 150 180 200 230 255 0 t - temperature (c) r1 r2 r3 r4 r5 217 max 260c 60 sec to 90 sec above 217 c p1 heat up p2 solder paste dry p3 solder reflow p4 cool down
28 / 31 p art no. : l t r - 303als - 01 bns - od - fc002/a4 optical sensor l tr - 303als - 01 1 4 . moisture proof packaging all ltr - 3 03 als - 01 are shipped in moisture proof package. once opened, moisture ab sorption begins. this part is compliant to jedec j - std - 033a level 3. time from unsealing to soldering after removal from the moisture barrier bag, the parts should be stored at the recommended storage conditions and soldered within seven days. when the m oisture barrier bag is opened and the parts are exposed to the recommended storage conditions for more than seven days, the parts must be baked before reflow to prevent damage to the parts. recommended storage conditions storage temperature 10 ? c to 30 ? c relative humidity below 60% rh baking conditions package temperature time in reels 60 ? c 48 hours in bulk 100 ? c 4 hours baking should only be done once.
29 / 31 p art no. : l t r - 303als - 01 bns - od - fc002/a4 optical sensor l tr - 303als - 01 1 5 . recommended land pattern and metal stencil aperture recommended land pattern note: all dimensions are in millimeters
30 / 31 p art no. : l t r - 303als - 01 bns - od - fc002/a4 optical sensor l tr - 303als - 01 recommended metal stencil aperture it is recommended that the metal stencil used for solder paste printing has a thickness (t) of 0.11mm (0.004 inches / 4 mils) or 0.127mm (0.005 inches / 5 mils). the stencil apertu re opening is recommended to be 0.72mm x 0.60mm which has the same dimension as the land pattern. this is to ensure adequate printed solder paste volume and yet no shorting. note: 1. all dimensions are in millimeters
31 / 31 p art no. : l t r - 303als - 01 bns - od - fc002/a4 optical sensor l tr - 303als - 01 1 6 . package dimension for tape and reel notes: 1. all dimensions are in millimeters (inches) 2. empty component pockets sealed with top cover tape 3. 7 inch reel - 25 00 pieces per reel 4. in accordance with ansi/eia 481 - 1 - a - 1994 specifications .

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