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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-308ALS-01 spec no.: ds86-2016-0027effective date: 04/19/2016revision: - bns-od-fc001/a4 bns-od-fc001/a4 bns-od-fc001/a4 bns-od-fc001/a4
optical sensor ltr - 308als - 01 1 / 29 part no. : ltr - 308als - 01 bns - od - fc002/a4 d escription the ltr - 308als - 01 is an integrated low voltage i2c ambient light sensor (als) in a single 2x2mm miniature chipled lead - free surface mount package. the als provides a linear response over a wide dynamic range, which is well suited to applicati ons under very low or bright ambient brightness. the sensor has a programmable interrupt with hysteresis to response to events and that removes the need to poll the sensor for a reading which improves system efficiency. this cmos design and factory - set o ne time trimming capability ensure minimal sensor - to - sensor variations for ease of manufacturability to the end customers. application control brightness of display panel in mobile, computing, and consumer devices. features ? i 2 c interface (standard mode @100khz or fast mode @400khz) ? ambient light in ultra - small c hip led package ? very low power consumption with sleep mode capability ? operating voltage ranges: 1.7v to 3.6v ? operating temperature ranges: - 40 to +85 oc ? built - in temperature compensation circuit ? p rogrammable interrupt function for als with upper and lower thresholds ? rohs and halogen free compliant ? als features ? 16 to 20 bits effective resolution ? wide dynamic range ( 0.0 1 to 157 k lux ) with linear response ? close to human eye spectral response ? automati c rejection for 50hz/60hz lighting flicker ordering information part number packaging type package quantity ltr - 308als - 01 tape and reel 6 - pin chipled package 25 00
optical sensor ltr - 308als - 01 2 / 29 part no. : ltr - 308als - 01 bns - od - fc002/a4 1. outline dimensions
optical sensor ltr - 308als - 01 3 / 29 part no. : ltr - 308als - 01 bns - od - fc002/a4 2. functional block diagram ltr - 308als - 01 con tains photodiode for respective photocurrent measurement. the photodiode currents are converted to digital values by adcs. the sensor also include s some peripheral circuits such as an internal oscillator, a current course, voltage reference, and internal f uses to store trimming information. 3. application circuit
optical sensor ltr - 308als - 01 4 / 29 part no. : ltr - 308als - 01 bns - od - fc002/a4 i/o pins configuration table p i n i/o type symbol d escription 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 sda * 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 ? ? notes: [1] selection of pull - up resistors value is dependent on bus capacitance values. for more details, please refer to i2 c specifications: http://www.nxp.com/documents/user_manual/um10204.pdf
optical sensor ltr - 308als - 01 5 / 29 part no. : ltr - 308als - 01 bns - od - fc002/a4 4. rating and specification 4.1. absolute maximum rating at t a =25c parameter symbol min. max. unit supply voltage vdd 4.0 v digital voltage range scl, sda, int - 0.5 4.0 v storage temperature t stg - 4 0 100 ? c electrostatic discharge protection (human body model jesd22 - a114) v hbm 2000 v note: exceeding these ratings could cause damage to the sensor. all voltages are w ith respect to ground. currents are positive into, negative out of the specified terminal. 4.2. recommended operating conditions description symbol min. typ. max. unit supply voltage vdd 1.7 3.6 v interface signal input high v i2chigh 1 .5 vdd v interface s ignal input low v i2clow 0 0.4 v operating temperature t ope - 40 85 ? c 4.3. electrical specifications (vdd = 1 .8 v, ta= 25c, unless otherwise noted) parameter min. typ. max. unit condition active supply current 110 ua max. duty cycle, vdd= 1 .8v, gain 3x st andby current 1 ua shutdown mode wakeup time from standby 5 10 ms from standby to active mode where measurement can start 4.4. characteristics ambient light parameter min. typ. max. unit condition als resolution 16 20 bit programmable for 16, 17, 18, 19 , 20 bit als lux accuracy - 1 0 1 0 % white led, 5000k, ta = 25 dark level count 0 5 count 0 lux, 18 - bit resolution integration time 50 400 ms with 50/60hz rejection 50/60 hz flicker noise error - 5 + 5 %
optical sensor ltr - 308als - 01 6 / 29 part no. : ltr - 308als - 01 bns - od - fc002/a4 4.5. typical device parameter (vdd = 2.8 v, t a= 25c, d efault power - up settings, unless otherwise noted ) als s pectral respons e figure 4.1 spectral response of als angular of incidence figure 4.2 als sensitivity vs. angular of incidence
optical sensor ltr - 308als - 01 7 / 29 part no. : ltr - 308als - 01 bns - od - fc002/a4 4.6 ac electrical characteristics all specifications a re at vbus = 1.7v, t op e = 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 condi tion. 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 ns 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 sta hd t ; low t high t sta su t ; sto su t ; r t f t dat hd t ; dat su t ; sp t
optical sensor ltr - 308als - 01 8 / 29 part no. : ltr - 308als - 01 bns - od - fc002/a4 5. principle 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 )
optical sensor ltr - 308als - 01 9 / 29 part no. : ltr - 308als - 01 bns - od - fc002/a4 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 read (1 for read) slave - to - master master - to - slave i2c slave address the device has a 7 - bit slave address of 0x53 . a read/write bit should be appended to the slave address by the master devic e to properly communicate with the device. i 2 c slave address (default) c ommand t ype (0x5 3 ) w/r value bit 7 bit 6 bit 5 bit 4 bit 3 bit 2 bit 1 bit 0 w rite 1 0 1 0 0 1 1 0 0xa 6 h read 1 0 1 0 0 1 1 1 0xa 7 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
optical sensor ltr - 308als - 01 10 / 29 part no. : ltr - 308als - 01 bns - od - fc002/a4 6. register set addr r /w register name desc ription reset value 0x00 rw main_ctrl als operation mode control, sw reset 0x00 0x01 ~0x03 r reserved -- -- 0x04 r/w als_meas_rate als measurement rate and resolution in active mode 0x22 0x05 r/w als _gain als analog gain 0x01 0x06 r part_id part n umber id and revision id 0xb 1 0x07 r main_status power - on status, interrupt status, data status 0x 2 0 0x08 ~ 0x0 c r reserved -- -- 0x0d r als_data _0 als adc measurement data, lsb 0x00 0x0e r als_data _1 als adc measurement data 0x00 0x0f r als_data _2 als adc measurement data, msb 0x00 0x1 0 ~0x18 r reserved -- 0x00 0x19 r/w int_cfg interrupt configuration 0x1 0 0x1a r/w int_pst interrupt persist setting 0x00 0x1b ~0x20 r reserved -- -- 0x21 r/w als_thres_up_0 als interrupt upper threshold, lsb 0x ff 0x22 r/w als_thres_up_1 als interrupt upper threshold, intervening bits 0x ff 0x23 r/w als_thres_up_2 als interrupt upper threshold, msb 0x0 f 0x24 r/w als_thres_low_0 als interrupt lower threshold, lsb 0x00 0x25 r/w als_thres_low_1 als interrupt lower threshold, intervening bits 0x00 0x26 r/w als_thres_low_2 als interrupt lower threshold, msb 0x00 main _ctr l register (0x 0 0) (read/write) this register controls the operation modes of als, which can be set to either standby or acti ve mode. when writing to this register, it will cause a stop to any ongoing measurements and start new measurement . 0x0 0 main _ctr l (default = 0x00) b7 b6 b5 b4 b3 b2 b1 b0 reserved softwar e reset reserved als enable reserved
optical sensor ltr - 308als - 01 11 / 29 part no. : ltr - 308als - 01 bns - od - fc002/a4 field bits default descr iption reserved 7:5 000 -- must write 000 sw reset 4 0 0 software reset is not triggered (default) 1 software reset is triggered reserved 2:3 0 0 -- must write 00 als enable 1 0 0 als standby(default) 1 als active reserved 0 0 -- must write 0 als_meas_rate register (0x04) (read/write ) this register controls als measurement resolution, gain setting and measurement rate. when the measurement rate is programmed to be faster than possible for the programmed adc measurement, the rate will be lower ed than programmed (maximum speed) . 0x04 als _meas_rate (default = 0x 22 ) b7 b6 b5 b4 b3 b2 b1 b0 reserved als/c resolution/bit width reserve d als measurement rate field bits default description reserved 7 0 must write 0 als resolution 6:4 010 000 20 bit, conversion time = 400ms 001 19 bit, conversion time = 200ms 010 18 bit, conversion time = 100ms(default) 011 17 bit, conversion time = 50ms 100 16 bit, conversion time = 25ms 101/110/111 reserved reserved 3 0 -- -- als measur ement rate 2:0 010 000 25ms 001 50ms 010 100ms (default) 011 500ms 101 1000ms 110/111 2000ms
optical sensor ltr - 308als - 01 12 / 29 part no. : ltr - 308als - 01 bns - od - fc002/a4 als_ gain register (0x 05) (read/write ) this register controls als measurement gain range . 0x05 als_gain (default = 0x 01 ) b7 b6 b5 b4 b3 b2 b1 b0 reserved als gain range field bits default description reserved 7:3 00000 00000 must write 00000 als gain range 2:0 001 000 gain range: 1 001 gain range: 3 (default) 010 gain range: 6 011 gain range: 9 100 gain range: 18 part_id register (0x 06) (read only ) this register defines the part number and revision identification of the sensor. 0x06 part_id (default = 0x b1 ) b7 b6 b5 b4 b3 b2 b1 b0 part number id revision id
optical sensor ltr - 308als - 01 13 / 29 part no. : ltr - 308als - 01 bns - od - fc002/a4 field bits default description part number id 7:4 101 1 part number id revision id 3:0 000 1 revision id main_status register (0x07) (read only ) this register stores the information about the als interrupts and data statu s. t he interrupt status in bit 4 determine s if the als interrupt criteria ar e met in normal interrupt mode. it triggers when the als data is above the upper or below the lower threshold for a specified number of consecutive measurements in respective interrupt persist settings. for details interrupt behavior, refer to section 10. 0x07 main_status (default = 0x 20 ) b7 b6 b5 b4 b3 b2 b1 b0 reserved power on status als interrup t status als data status reserved field bits default description reserved 7:6 00 00 must write 00 power on status 5 0 0 power on event and all interrupt thres hold settings in the registers have been rest to power on default states (either due to part turned on or power supply voltage glitch ). flag is cleared after read. als interrupt status 4 0 0 interrupt is not triggered (default) 1 interrupt is triggere d and will be cleared after read als data status 3 0 0 als data is old data (data has been read) 1 als data is new data (data has not been read and will be cleared after read ) reserved 2:0 000 000 must write 000
optical sensor ltr - 308als - 01 14 / 29 part no. : ltr - 308als - 01 bns - od - fc002/a4 als _data register (0x 0d / 0x 0e / 0x0f ) (read only) the als channel digital output data are expressed as a 16 to 20 bit unsigned integer data. when i2c read operation is active and points to any of the register address between 0x07 and 0x18, all 3 registers will be locked until the i2c rea d operation has been completed or the specified address range is left. this is to ensure that the data in the registers is from the same measurement even if an additional measurement cycle ends during the read operation. new measurement data is stored int o temporary registers and the als _ data registers will be updated as soon as there is no on - going i2c read operation to the address range 0x07 to 0x18. 0x0d al s_data _0 (default = 0x00) b7 b6 b5 b4 b3 b2 b1 b0 als d ata, low 0x0e als data_ 1 (default = 0x00) b7 b6 b5 b4 b3 b2 b1 b0 als data, middle 0x0f als _data_ 2 (default = 0x00) b7 b6 b5 b4 b3 b2 b1 b0 reserved als data, high field address bits default description als data , low 0x0 d 7:0 00000000 als data lower byte data als data , midd le 0x0 e 7:0 00000000 als data middle byte data als data , high 0x0 f 7:4 0000 reserved 3:0 0000 als data higher byte data
optical sensor ltr - 308als - 01 15 / 29 part no. : ltr - 308als - 01 bns - od - fc002/a4 int_cfg register (0x 19) (read/write ) this register controls the operation of the interrupt pin and functions. als ha s inde pendent interrupt signal and als interrupt is active low. als interrupt is enabled by bit 2 . under normal interrupt mode, the edge - triggered interrupt signal output will be maintains at active level until main_status register is read. 0x19 int_cfg (default = 0 x 10 ) b7 b6 b5 b4 b3 b2 b1 b0 reserved als int select reserved als int pin enable reserved field bits default description reserved 7:6 00 00 must write 00 als interrupt sel ect 4:5 01 00 reserved 01 als channel(default) reserved 3 0 0 must be 0 als interrupt pin enable 2 0 0 als interrupt disabled (default) 1 als interrupt enabled reserved 1:0 00 0 0 must write 00 int_pst register (0x 1a) (read/write ) this 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 interrupt. 0x1a int_pst (default = 0x 00 ) b7 b6 b5 b4 b3 b2 b1 b0 als persist reserved
optical sensor ltr - 308als - 01 16 / 29 part no. : ltr - 308als - 01 bns - od - fc002/a4 field bits default description als persist 7:4 0000 0000 every al s value out of threshold ran ge asserts an interrupt (default) 0001 2 consecutive al s values out of threshold range assert an interrupt 1111 16 consecutive al s values out of threshold range assert an interrupt reserved 3:0 0000 must write 0000 als_thres register (0x 21 / 0x 22 / 0x23 / 0x24 / 0x25 / 0x26 ) (read /write ) the als_thres_up (up to 20 - b its) and als_thres_low (up to 20 - bits) registers determines the upper and lower limit of the interrupt threshold value respectively. interrupt will be triggered if measureme nt data in als_data is exceeding the upper and lower limits. 0x21 als_thres_up_0 (default = 0x ff ) b7 b6 b5 b4 b3 b2 b1 b0 als upper threshold, low 0x22 als_thres_up_1 (default = 0x ff ) b7 b6 b5 b4 b3 b2 b1 b0 als upper threshold, mid 0x23 al s_ thres_up_2 (default = 0x0 f ) b7 b6 b5 b4 b3 b2 b1 b0 reserved als upper threshold, high 0x24 als_thres_low_0 (default = 0x 00 ) b7 b6 b5 b4 b3 b2 b1 b0
optical sensor ltr - 308als - 01 17 / 29 part no. : ltr - 308als - 01 bns - od - fc002/a4 als lower threshold, low 0x25 als_thres_low_1 (default = 0x 00 ) b7 b6 b5 b4 b3 b2 b1 b0 als lower threshold, mid 0x26 al s_ thres_low_2 (default = 0x0 0 ) b7 b6 b5 b4 b3 b2 b1 b0 reserved als lower threshold, high field address bits default description als upper threshold, low 0x 21 7:0 11111111 als upper interrupt threshold, low byte als up per threshold, mid 0x 22 7:0 11111111 als upper interrupt threshold, mid byte als upper threshold, high 0x 23 7: 4 0000 reserved 3 :0 11 11 als upper interrupt threshold, high byte als lower threshold, low 0x 24 7:0 00000000 als lower interrupt threshold, low byte als lower threshold, mid 0x 25 7:0 00000000 als lower interrupt threshold, mid byte als lower threshold, high 0x 26 7: 4 0000 reserved 3 :0 00 00 als lower interrupt threshold, high byte 7. application information 7 .1 lux formula lux_calc i s the calculated lux reading and als data is the digital representation (output adc) of ambient light level stored in the registers (address: 0x 0d - 0x0f ) regardless of light sources.
optical sensor ltr - 308als - 01 18 / 29 part no. : ltr - 308als - 01 bns - od - fc002/a4 for no window (clear window) for device under window ( eg: tinted wind ow ) window factor is needed when device under window glass with coated tinted ink. this is to compensate the light loss due to the lower transmission rate of the window glass. where: als gain gain resolution (bit) / integration time (ms) int x1 1 16 - bit, 25ms 0.25 x3 3 17 - bit, 50ms 0.5 x6 6 18 - bit, 100ms 1 x 9 9 19 - bit, 200ms 2 x18 18 20 - bit, 400ms 4 note : 1. for low lux detection ( 0.01 lux to 10 000 lux , under bare die condition), it is recommended to use highest gain (gain x18) and highest resolution bit (20 bit) . 2. for default setting gain 3x, 18 - bits, 100ms integration time , detectable lux 0.2 to 52k lux 7.2 device operation (state machine and interrupt features) state machine below diagram is t he main state machine of ltr - 3 0 8 al s .
optical sensor ltr - 308als - 01 19 / 29 part no. : ltr - 308als - 01 bns - od - fc002/a4 during the als operation, als measurements can be activated by set ting the a ls_enable bit to 1 . as soon as the als sensors become activated through an i2c command, the internal support blocks are powered on. once the voltages and currents are settled (typically after 5ms), the state machine checks for trigger events from a me asurement scheduler to start als conversions according to the selected me asurement repeat rates. once als_enable is changed back to 0, a running conversion on the respective channe l will be completed and the relevant adcs and support blocks will move to power - down state. interrupt features this dev ice generates independent als interrupt signal that can be multiplexed and output to the int output pin. the interrupt conditions are a lways evaluated after completion of a new convers ion of the als channels. als interrupts is active low at the int pin. als interrupt the als interrupt is enabled by bit 2 (als int pin enabled) of int_ cfg register (0x19). the source is selected by bit 4 and 5 (als int select) of int_cfg register.
optical sensor ltr - 308als - 01 20 / 29 part no. : ltr - 308als - 01 bns - od - fc002/a4 the int is set when the data of the selected interrupt source is above the upper or below the lower threshold for a specified number of consecutive measurements set in als persist in int_pst register (0x1a). th e interrupt signal is also stored in main_status register (0x 07) as flag bit in bit 4 (als int status). this status flag bit is cleared by reading the main_status register. a cleared flag will also clear the interrupt signal on the int pin.
optical sensor ltr - 308als - 01 21 / 29 part no. : ltr - 308als - 01 bns - od - fc002/a4 8. pseudo codes examples slave address slave_addr = 0xa6 main_ctrl register // this define s the operating modes of the als // default settings is 0x00 ( als standby) register_addr = 0x00 // main_ctrl register command = 0x03 // als in a ctive mode // command = 0x07 , als in active mode, writebyte(slave_addr, register_addr, command); als_meas_rate register // this controls the als measurement resolution and measurement rate. // default setting of the register is 0x22 (resolution = 18 bit, measurement rate of 100ms) register_addr = 0x04 // als_meas_rate register command = 0x41 // resolution = 16 bit, meas rate =5 0ms // command =0x25 , resolution = 18 bit, meas rate =10 00ms // command =0x02 , resolution = 20 bit, me as rate = 100ms writebyte(slave_addr, register_addr, command) als_ gain register // this controls the als gain range . // default setting of the register is 0x 01 ( gain range = 3 ) register_addr = 0x0 5 // als_ gain register command = 0x 00 // gain = 1 // command =0x 04, gain = 18 writebyte(slave_addr, register_addr, command) main _status register (read only) // this register contains the information on interrupt, als data status. register_addr = 0x07 // main _status register address data = re adbyte(slave_addr, register_addr) power_on_status = data & 0x20 // if 0x20 part went through power - up event // if 0x00 normal als _interrupt_status = data & 0x1 0 // if 0x10 interrupt triggered // if 0x00 interrupt condition not fulfilled als_data_ status = data & 0x08 // if 0x 08 als d ata is new / / if 0x00 old (previously read) data als_data registers (read only) // the register 0x 0d contains als_ adc 0 lower byte data. // the register 0x 0e contains als _ adc 1 upper byte data. // the register 0x 0f contains als_ adc 2 (top) upper byte data. // these registers should be read as a group, with the lower address being read first.
optical sensor ltr - 308als - 01 22 / 29 part no. : ltr - 308als - 01 bns - od - fc002/a4 register_addr = 0x 0d // als _data_ _ 0 low byte address data0=readbyte(slave_addr, register_addr) register_addr = 0x 0e // als _data_1 middle byte address data1=readbyte(slave_addr, register_addr) register_addr = 0x0f // al s_data_2 upper byte address data2=readbyte(slave_addr, register_addr) als _adc_data =(d ata2<<16)| (data1 << 8) | data0 // shift and combine all register s to get als_ adc data int _cfg register //this register controls the operation of the interrupt pins and options to trigger interrupt for als. //the default value for this int _cfg register is 0x 1 0 (interrupts inactive for both als) register_addr = 0x 19 // int _cfg register address command = 0x14 // interrupt ch = als, als interrupt enable , normal trigger m ode writebyte(slave_addr, register_addr, command) interrupt_persist register // this register sets the als persist level. // the default setting is 0x00. interrupt at every als reading outside set thresholds. register_addr = 0x 1 a // int_pst register command = 0x0 0 // interrupt for every als value outside threshold // command =0x 10, subsequent 2 als outside threshold range writebyte(sl ave_addr, register_addr, command) als_thres registers //the register 0x 21 contains als interrupt upper threshold lower byte data (als_thres_up_0) //the register 0x 22 contains als interrupt upper threshold 1 upper byte data (als_thres_up_1) //the register 0x 23 contains als interrupt upper threshold 2 upper byte data (als_thres_up_2) //the register 0x 24 contains als interrupt lower threshold lower byte data (als_thres_low_0) //the register 0x 25 contains als interrupt lower threshold 1 upper byte data (als_ thres_low_1) //the register 0x 26 contains als interrupt lower threshold 2 upper byte data (als_thres_low_2) // to set als upper threshold for interrupt upper_threshold_value=1000 // example 1000 data2 = upper_threshold_value >> 16 // shift rig ht to extract the 2 upper byte data1 = upper_threshold_value >> 8 // shift right to extract the 1 upper byte data0 = upper_threshold_value & 0xff // mask to extract lower byte. register_addr = 0x21 // als_thres_up_0 register address writebyte(slav e_addr, register_addr, data0) register_addr = 0x22 // als_thres_up_1 register address writebyte(slave_addr, register_addr, data1) register_addr = 0x23 // als_thres_up_2 register address writebyte(slave_addr, register_addr, data2) // to set als lower threshold for interrupt lower_threshold_value=100 // example 100 data2 = lower_threshold_value >> 16 // shift right to extract the 2 upper byte data1 = lower_threshold_value >> 8 // shift right to extract the 1 upper byte data0 = lower_thre shold_value & 0xff // mask to extract lower byte. register_addr = 0x24 // als_thres_low_0 register address
optical sensor ltr - 308als - 01 23 / 29 part no. : ltr - 308als - 01 bns - od - fc002/a4 writebyte(slave_addr, register_addr, data0) register_addr = 0x25 // als_thres_low_1 register address writebyte(slave_addr, regi ster_addr, data1) register_addr = 0x26 // als_thres_low_2 register address writebyte(slave_addr, register_addr, data2)
optical sensor ltr - 308als - 01 24 / 29 part no. : ltr - 308als - 01 bns - od - fc002/a4 9. recommended leadfree reflow profile process zone symbol ? t maximum ? t/ ? time or duration heat up p 1, r1 25 ? c to 150 ? c 3 ? c/s solder paste dry p2, r2 150 ? c to 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 liquids 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
optical sensor ltr - 308als - 01 25 / 29 part no. : ltr - 308als - 01 bns - od - fc002/a4 10. moisture proof packaging all ltr - 308als - 01 are shi pped in moisture proof package. once opened, moisture absorption 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 storag e conditions and soldered within seven days. when the moisture 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.
optical sensor ltr - 308als - 01 26 / 29 part no. : ltr - 308als - 01 bns - od - fc002/a4 11. 11. recommended land pattern recomme nded land pattern for ltr - 308als - 01 note: all dimensions are in millimeters
optical sensor ltr - 308als - 01 27 / 29 part no. : ltr - 308als - 01 bns - od - fc002/a4 12. 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 in ches / 5 mils). the stencil aperture opening is recommended to be 0. 3 mm x 0. 65 mm 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
optical sensor ltr - 308als - 01 28 / 29 part no. : ltr - 308als - 01 bns - od - fc002/a4 13. tape and reel dimensions notes: 1. all dimensions are in millimeters (inches) 2. empty component pockets sealed with top cover tape 3. 7 inch reel - 2500 pieces per reel 4. in accordance with ansi/eia 481 - 1 - a - 1994 specifications
optical sensor ltr - 308als - 01 29 / 29 part no. : ltr - 308als - 01 bns - od - fc002/a4 revision table: version update page date 1.0 final datasheet as created total 29 2 2 - mar - 1 6 1.1 update part id from 0xb2 to 0xb1 10 29 - mar - 16

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