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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-390UV-01 spec no.: ds86-2015-0004effective date: 02/03/2016revision: - bns-od-fc001/a4 bns-od-fc001/a4 bns-od-fc001/a4 bns-od-fc001/a4
1 / 33 optical sensor ltr - 39 0 uv - 01 part no. : ltr - 390uv - 01 bns - od - fc002/a4 d escription the ltr - 390uv - 01 is an integrated low voltage i2c ambient light sensor (als) and ultraviolet light sensor (uvs) in a single miniature 2x2mm chipled lead - free surface mount package. this sensor converts light intensity to a digital output signal capable of direct i2c interface. it provides a linear als response over a wide dynamic range , and is well suited to applications under high ambient brightness. the sensor has a progra mmable 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 one time trimming capability ensure minimal sensor - to - sensor variations for ease of manufacturability to the end customers. application ? identifying the uv index in ambient light helps people to effectively protect themselves from sunburns, cancer or eye damage. ? to control brightness and color of the display panel in mobile, computing, and consumer devices. features ? i 2 c interface capable of standard mode @100khz or fast mode @400khz communication; 1.8v logic compatible ? ambient light / u ltraviolet light (uvs) technology in one ultra - small 2x2mm chipled package ? very low power consumption with sleep mode capability ? operating voltage ranges: 1.7 v to 3.6v ? operating temperature ranges: - 40 to +85 o c ? built - in temperature compensation circuit ? programmable interrupt function for als , uvs with upper and lower thresholds ? rohs and halogen free compliant ? uv s/als features ? 1 3 to 20 bits effective resolution ? wide dynamic range of 1: 18, 000 , 000 with linear response ? close to human eye spectral response ? automatic rejection for 50hz/60hz lighting flicker ordering information part number packaging type package quantity ltr - 390uv - 01 tape and reel 6 - pin chipled package 25 00
optical sensor ltr - 390uv - 01 2 / 33 part no. : ltr - 390uv - 01 bns - od - fc002/a4 1. outline dimensions
optical sensor ltr - 390uv - 01 3 / 33 part no. : ltr - 390uv - 01 bns - od - fc002/a4 2. functional block diagram ltr - 390uv - 01 contains 2 integrated photodiodes (als/ uvs ) for respective photocurrent measurement s . the photodiode currents are converted to digital values b y adcs. the sensor also includes some peripheral circuits such as an intern al oscillator and voltage reference.
optical sensor ltr - 390uv - 01 4 / 33 part no. : ltr - 390uv - 01 bns - od - fc002/a4 3. application circuit 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 i2c specifications: http://www.nxp.com/documents/user_manual/um10204.pdf
optical sensor ltr - 390uv - 01 5 / 33 part no. : ltr - 390uv - 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 - 45 to 95 ? c max. input current scl,sda ,int - 100 100 ma 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 with 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 signal input low v i2clow 0 0.4 v operating temperature t ope - 40 85 ? c 4.3. electrical specifications (vdd = 2.8 v, ta= 25c, unless otherwise noted) parameter min. typ. max. unit condition als active mode current 1 10 ua max. duty cycle, vdd=2.8v, gain 3x uv s active mode current 100 ua max. duty cycle, vdd=2.8v standby current 1 ua standby / sleep mode wakeup time from standby 5 10 ms from standby to active mode where measurement can start
optical sensor ltr - 390uv - 01 6 / 33 part no. : ltr - 390uv - 01 bns - od - fc002/a4 4.4. characteristics ambient light parameter min. typ. max. unit condition als output resolution 1 3 18 20 bit programmable for 13,16,17,18,19, 20 bit dark level count 0 5 count 0 lux, t ope =25c, 1 8 - bit range calibrated lux error in gain range 3 - 10 10 % white led, 5000k, t ope = + 25c als accuracy - 2 5 2 5 % across different light sources 50/60 hz flicker noise error - 5 5 % 4.5. characteristics uvs sensor parameter min. typ. max. unit condition uv s output resolution 1 3 18 20 bit programmable for 13,16,17,18,19,20 bit uv count 160 count uv led 310nm , t ope =25c , 18 - bit gain range =18, irradiance = 70 uw /cm2 uv sensitivity 2300 counts/uvi gain range = 18 , 20 - bit uvi accuracy - 20 20 % gain range = 18, 20 - bit for uvi>5 - 1 1 uvi uvi<5
optical sensor ltr - 390uv - 01 7 / 33 part no. : ltr - 390uv - 01 bns - od - fc002/a4 4.6. typical device paramete r (vdd = 2.8 v, ta= 25c, d efault power - up settings, unless otherwise noted ) als s pectral respons e figure 4.1 spectral response of als uv response figure 4.2 uv spectral response angular of incidence figure 4.3 als sensitivity vs. angular of incidence uv count vs source irradiance figure 4.4 uv count vs source irradiance 0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1 1.1 300 500 700 900 1100 normalized responsitivity wavelength [nm] 0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1 1.1 250 350 450 550 normalized responsitivity wavelength [nm] 0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1 1.1 250 350 450 550 normalized responsitivity wavelength [nm]
optical sensor ltr - 390uv - 01 8 / 33 part no. : ltr - 390uv - 01 bns - od - fc002/a4 uv count vs gain figure 4.5 uv count vs gain sensor uvi vs ref uvi (gain 18x , 20 - bit, sensitivity=2300 counts/uvi ) figure 4.6 sensor uvi vs reference uvi (reference meter uvmicrolog by sglux)
optical sensor ltr - 390uv - 01 9 / 33 part no. : ltr - 390uv - 01 bns - od - fc002/a4 4.8. ac electrical characteristics all specifications are at vbus = 1.7v, t op e = 25 ? c, unless otherwise noted. parameter symbol standard (min) fast (min) unit scl clock frequency 1 00 400 khz bus free time between a stop and start condition 4.7 u s hold time (repeated) start condition. after this period, the first clock pulse is generated 4 u s low period of the scl clock 4.7 u s high period of the scl clock 4 u s set - up time for a repeated start condition 4.7 u s set - up time for stop condition 4 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 u s data setup time 100 100 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 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
optical sensor ltr - 390uv - 01 10 / 33 part no. : ltr - 390uv - 01 bns - od - fc002/a4 5. principle of operation 5.1 i2c protocol i. i2c write protocol ii. i2c write (block write) 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 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 ) slave address w a s register address a p 7 1 1 1 8 1 1 slave id ( write ) scl 1 2 3 4 5 6 7 8 9 sda 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 slave address register address a a s p w slave id ( write )
optical sensor ltr - 390uv - 01 11 / 33 part no. : ltr - 390uv - 01 bns - od - fc002/a4 iii. i2c read protocol iv. i2c read ( block read ) 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 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 ) 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 - 390uv - 01 12 / 33 part no. : ltr - 390uv - 01 bns - od - fc002/a4 v. 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 device 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 read 1 0 1 0 0 1 1 1 0xa 7
optical sensor ltr - 390uv - 01 13 / 33 part no. : ltr - 390uv - 01 bns - od - fc002/a4 6. register set address r / w register name description reset value 0x00 r / w main_ctrl als/uv s operation mode control, sw reset 0x00 0x04 r/w als _ uv s_meas_rate als/ uv s measurement rate and resolution in active mode 0x 22 0x05 r /w als _ uv s_gain als/ uv s analog gain range 0x 01 0x 06 r part_id part number id and revision id 0x b 2 0x 07 r main_status power - on status, interrupt status, data status 0x20 0x0d r al s_data_0 als adc measurement data, lsb 0x00 0x0e r al s_data_1 als adc measurement data 0x00 0x0f r al s_data_2 als adc measurement data, msb 0x00 0x10 r uv s_data_0 uvs adc measurement data, lsb 0x00 0x11 r uv s_data_1 uvs adc measurement data 0x00 0x12 r uv s_data_2 uvs adc measurement data, msb 0x00 0x13 C 0x18 r reserved reserved 0x00 0x19 r/w int_cfg interrupt configuration 0x 10 0x1a r/w int_pst interrupt persist setting 0x0 0 0x2 1 r/w a ls _ uvs _thres_up_0 als/uvs interrupt upper threshold, lsb 0x ff 0x2 2 r/w a ls _ uvs _thres_up_1 als /uvs interrupt upper threshold, intervening bits 0x ff 0x2 3 r/w a ls _ uvs _thres_up_2 als /uvs interrupt upper threshold, msb 0x 0f 0x2 4 r/w a ls _ uvs _thres_low_0 als /uvs interrupt lower threshold, lsb 0x 00 0x2 5 r/w a ls _u vs _thres_low_1 als /uvs interrupt lower threshold, intervening bits 0x00 0x2 6 r/w a ls _ uvs _thres_low_2 als /uvs interrupt lower threshold, msb 0x 00
optical sensor ltr - 390uv - 01 14 / 33 part no. : ltr - 390uv - 01 bns - od - fc002/a4 6.1 main_ctrl register (address: 0x00 ) (read/write) this register controls the operation modes of uv s/als, which can be set to either standby or active mode. when writing to this register, it will cause a stop t o any ongoing measurements als / uvs and start new measurement . 0x00 main _c trl (default = 0x00) bit 7 bit 6 bit 5 bit 4 bit 3 bit 2 bit 1 bit 0 reserved software reset uvs_mode 0 als/uvs enable 0 field bits default description reserved 7:5 000 -- -- sw reset 4 0 0 software reset is not triggered (default) 1 software reset is triggered uvs_mode 3 0 0 als mode 1 uvs mode reserved 2 0 -- reserved als/uvs enable 1 0 0 light sensor (als/ or uvs) standby 1 light sensor (als/ or uvs) active reserved 0 0 0 write as 0
optical sensor ltr - 390uv - 01 15 / 33 part no. : ltr - 390uv - 01 bns - od - fc002/a4 6.2 als_ uv s _m eas_rate register (address: 0x04 ) (read/write) this register controls als/ uv s 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 lowered than prog rammed (maximum speed). field bits default description reserved 7 0 -- -- als/uv s resolution 6 : 4 010 000 20 bit, conversion time = 4 00ms 001 19 bit, conversion time = 2 00ms 010 18 bit, conversion time = 1 00ms (default) 011 17 bit, conversion time = 50 ms 100 16 bit, conversion time = 25 ms 101 13 bit, conversion time = 12.5 ms 110/111 reserved reserved 3 0 -- reserved als/uv s measurement rate 2:0 01 0 000 25 ms 001 50 ms 010 1 00ms (default) 011 2 00ms 10 0 5 00ms 101 1000ms 110/111 2000ms 0x 04 als _ uv s_meas_rate (default = 0x22 ) bit 7 bit 6 bit 5 bit 4 bit 3 bit 2 bit 1 bit 0 0 als/uv s resolution 0 als/uv s measurement rate
optical sensor ltr - 390uv - 01 16 / 33 part no. : ltr - 390uv - 01 bns - od - fc002/a4 6.3 als _ uv s_g ain (address: 0x05) (read/write) this register controls als/uv s measurement gain range . field bits default description reserved 7:3 0000 0 -- reserved als /uvs 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 6.4 pa rt_id register (address: 0x06 ) (read only) this register defines the part number and revision identification of the sensor. field bits default description part number id 7:4 1011 part number id revision id 3:0 0010 revision id of the component. the value increases by one each time a new silicon revision is manufactured. 0x05 als_uvs_gain (default = 0x01 ) bit 7 bit 6 bit 5 bit 4 bit 3 bit 2 bit 1 bit 0 reserved als /uvs gain range 0x06 part_id (default = 0xb 2 ) bit 7 bit 6 bit 5 bit 4 bit 3 bit 2 bit 1 bit 0 part number id revision id
optical sensor ltr - 390uv - 01 17 / 33 part no. : ltr - 390uv - 01 bns - od - fc002/a4 6.5 main_ status register (address: 0x07 ) (read only) this register stores the information about the als /uv s interrupts and data status. the interrupt status in bit 4 determines if the als /uv s interrupt criteria are met in normal interrup t mode. it triggers when the uv s/als data is above the upper or below the lower threshold for a specified number of consecutive measurements in respective interrupt persist settings. field bits default description reserved 7:6 00 -- power - on status 5 1 1 power on event and all interrupt threshold settings in the registers have been reset to power on default states and should be examined if necessary. 0 this flag is cleared after the register is read. als/ uv s interrupt status 4 0 0 interrupt is not triggered (default) 1 interrupt is triggered and will be cleared after read uv s/als data status 3 0 0 uv s/als data is old data (data has been read) 1 uvs /als data is new data (data has not been read and will be cleared after read ) reserved 2:0 000 --- 0x07 main _status (default = 0x20 ) bit 7 bit 6 bit 5 bit 4 bit 3 bit 2 bit 1 bit 0 reserved power - on status als/uvs interrupt status als/uvs data status reserved
optical sensor ltr - 390uv - 01 18 / 33 part no. : ltr - 390uv - 01 bns - od - fc002/a4 6.6 al s_data registers (address: 0x0 d / 0x0 e/0x0f ) (read only) the ambient light sensor channel digital o utput data are expressed as a 1 3 to 20 bit unsigned integer data. when i 2 c read operation is active and points to any of t he regist er address between 0x07 and 0x1 2 , all 3 registers will be locked until the i 2 c read 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 into temporary registers and the actual al s_data registers will be updated as soon as there is no on - going i 2 c read ope ration to the add ress range 0x07 to 0x1 2 . field address bits default description als_ data _0 , low 0x0 d 7:0 00000000 al s data lower byte data al s _ data _1 , middle 0x0 e 7:0 00000000 al s data middle byte data al s _ data _2 , high 0x0 f 7:4 0000 reserved 3:0 0000 al s data higher byte data 0x0 d al s_data_0 (default = 0x00) bit 7 bit 6 bit 5 bit 4 bit 3 bit 2 bit 1 bit 0 al s _data_0 , low 0x0 e als_data _1 (default = 0x00) bit 7 bit 6 bit 5 bit 4 bit 3 bit 2 bit 1 bit 0 al s _ data _1 , middle 0x0 f al s_data_2 (default = 0x00) bit 7 bit 6 bit 5 bit 4 bit 3 bit 2 bit 1 bit 0 reserved al s _data_2 , high
optical sensor ltr - 390uv - 01 19 / 33 part no. : ltr - 390uv - 01 bns - od - fc002/a4 6.7 uv s_dat a registers (address: 0x 10 /0x 11 /0x 12 ) (read only) the uv sensor channel digital o utput data are expressed as a 16 to 20 bit unsigned integer data. when i 2 c read operation is active and points to any of the register address between 0x07 and 0x1 2 , all 3 registers will be locked until the i 2 c read 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 cy cle ends during the read operation. new measurement data is stored into temporary registers and the uv sensor registers will be updated as soon as there is no on - going i 2 c read ope ration to the address range 0x07 to 0x1 2 . field address bits default description uv s _ data _0 0x 10 7:0 00000000 uv s data lower byte data uvs_data_1 0x 11 7:0 00000000 uv s data middle byte data uv s _ data _2 0x 12 7: 4 0000 reserved 3 :0 00 00 uvs data higher byte data 0x 10 uv s_data_0 (default = 0x00) bit 7 bit 6 bit 5 bit 4 bit 3 bit 2 bit 1 bit 0 uvs _ data _0 , low byte data 0x11 uv s_data_ 1 (default = 0x00) bit 7 bit 6 bit 5 bit 4 bit 3 bit 2 bit 1 bit 0 uvs _ data _1 , middle byte data 0x1 2 uv s_data_ 2 (default = 0x00) bit 7 bit 6 bit 5 bit 4 bit 3 bit 2 bit 1 bit 0 reserved uvs _ data _2 , higher byte data
optical sensor ltr - 390uv - 01 20 / 33 part no. : ltr - 390uv - 01 bns - od - fc002/a4 6.8 i nt_cfg register (address: 0x19 ) (read/write) this register controls the operation of the interrupt pin and functions. the als/uvs interrupt is enabled by ls_int_en=1 ( bit 2 ). the als/uvs interrupt source generator either uses the als_data or the uvs_data registers as input. the al s / uvs interrupt source is selected by the ls_int_sel bits in the int_cfg register field bits default description reserved 7: 6 00 -- -- ls interrupt selection 5 : 4 0 1 00 reserved 01 als channel (default) 10 reserved 11 uvs channel reserved 3 0 -- -- ls interrupt enable 2 0 0 ls interrupt disabled (default) 1 ls interrupt enabled reserved 1:0 0 0 write as 00 0x19 int _cfg (default = 0x10 ) bit 7 bit 6 bit 5 bit 4 bit 3 bit 2 bit 1 bit 0 reserved ls_int_sel reserved ls_int_en reserved
optical sensor ltr - 390uv - 01 21 / 33 part no. : ltr - 390uv - 01 bns - od - fc002/a4 6.9 int_pst register (address: 0x1a) (read/write) this register int_pst (interrupt persist) sets the als /uv persist level. persist is the n number of times the measurement data is outside the range defined by the upper and lower threshold limits before asserting the interrupt. field bits default description als /uv persist 7:4 0000 0000 every a l s /uv value out of threshold range asserts an interrupt (default) 0001 2 consecutive als/uv values out of threshold range assert an interrupt 1111 16 consecutive als/uv values out of threshold range assert an interrupt reserved 3:0 0000 6.10 uvs _ als_thres registers (address: 0x 21/ 0x 22 /0x 2 3 /0x24/0x25/0x26 ) (read/write) the uvs/ als_thres_up (up to 20 - bits) and uvs/ 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 measurement data in data _x registers is exceeding the upper and lower limits. 0x 1a int persist (default = 0x00) bit 7 bit 6 bit 5 bit 4 bit 3 bit 2 bit 1 bit 0 als/uv _ persist reserved 0x 21 uvs/ als_thres_up_0 (default = 0xff) bit 7 bit 6 bit 5 bit 4 bit 3 bit 2 bit 1 bit 0 uvs/als upper threshold, low 0x22 uvs/als_thres_up_1 (default = 0xff) bit 7 bit 6 bit 5 bit 4 bit 3 bit 2 bit 1 bit 0 uvs/als upper threshold, middle 0x23 uvs/als_thres_up_2 (default = 0x 0 f) bit 7 bit 6 bit 5 bit 4 bit 3 bit 2 bit 1 bit 0 reserved uvs/als upper threshold, higher
optical sensor ltr - 390uv - 01 22 / 33 part no. : ltr - 390uv - 01 bns - od - fc002/a4 field address bits default description uv s/als upper threshold, low 0x 21 7:0 11111111 cs/als upper interrupt threshold, low byte uv s/als upper threshold, mid 0x22 7:0 11111111 cs/als upper interrupt threshold, mid byte uv s/als upper threshold, high er 0x23 7:4 0000 reserved 3 :0 11 1 1 uv s/als upper interrupt threshold, higher byte uv s/als lower threshold, low 0x24 7:0 00000000 uvs /als lower interrupt threshold, low byte uv s/als lower threshold, mid 0x25 7:0 00000000 uvs /als lower interrupt threshold, mid byte uv s/als lower threshold, high er 0x26 7: 4 0000 reserved 3 :0 00 0 0 uvs /als lower interrupt threshold, high er byte 0x24 uvs/als_thres_low_0 (default = 0x00) bit 7 bit 6 bit 5 bit 4 bit 3 bit 2 bit 1 bit 0 uvs/als low threshold, low 0x25 uvs/als_thres_low_1 (default = 0x00) bit 7 bit 6 bit 5 bit 4 bit 3 bit 2 bit 1 bit 0 uvs/als low threshold, middle 0x26 uvs/als_thres_low_2 (default = 0x00) bit 7 bit 6 bit 5 bit 4 bit 3 bit 2 bit 1 bit 0 reserved uvs/als low threshold, higher
optical sensor ltr - 390uv - 01 23 / 33 part no. : ltr - 390uv - 01 bns - od - fc002/a4 7. als/uvi formula 7.1 als lux formula lux_cal c is the calculated lux reading based on the output adc from als data regardless of light sources. ?? ? ???? = 0 . 6 ??? _ ???? ( ???? ??? ) ? ??? where : 1. als_ data = data stored in the registers ( address: 0x 0d - 0x0f) 2. for device under t inted window with coated - ink of flat transmission rate at 400 - 600nm wavelength, window factor is to compensate light loss due to the lower transmission rate from the coated - ink. a. wfac = 1 for no window / clear window glass. b. wfac > 1 device under tinted window glass. calibrate under white led. 3. the gain factors & integration time factors: 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 7.2 uvi conversion formula ??? ???? = ?? ?????? ????? ?? ??????????? ? ??? where: 1. w fac depends on the type of window used. w fac =1 (no window )
optical sensor ltr - 390uv - 01 24 / 33 part no. : ltr - 390uv - 01 bns - od - fc002/a4 8. device operation (state machine and interrupt features) 8.1 state machine below diagram is the main state machine of ltr - 390 uv . als measurements can be activated by setting the uvs/ als_enable bit to 1 and the uvs_mode bit to 0 in the main_ctrl register. uv measurements can be activated by setting the ls_en bit to 1 and the uvs_mode bit to 1 in the main_ctrl register . as soon as als or uvs become activated through an i 2 c? 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 measurement scheduler to start the als or uvs conversions according to the selected measurement repeat rates . once ls_en is changed back to 0, a conversion running on the respective channel wil l be completed and the relevant adcs and support blocks will move to standby mode.
optical sensor ltr - 390uv - 01 25 / 33 part no. : ltr - 390uv - 01 bns - od - fc002/a4 8.2 interrupt features thi s device generates light sensor ( als or uvs depending on configuration) interrupt signals a nd output to the int pad. the interrupt conditions are always evaluated after completion of a new conversi on on the a ls /uv channels. 8.2.1 als/uvs sensor interrupt the ls interrupt is enabled by l s_int_en=1 . the a ls /uvs interrupt source generator either uses the als_data or the uvs_data registers as input. the a ls /uvs interrupt source is selected by the a ls /uvs _int_sel bits in the int_cfg register. the light sensor threshold interrupt is enabled with a ls /uvs _int_en=1. it is set when the als_data or uvs_data data is above the upper or below the lower t hreshold for a specified number of consecutive measurements . it is set when the absolute value of the difference between the previous and current a ls /uvs data is above the decoded a ls /uvs variance threshold for a specified number of consecutive measurement s (1+ a ls /uvs _persist).
optical sensor ltr - 390uv - 01 26 / 33 part no. : ltr - 390uv - 01 bns - od - fc002/a4 9. pseudo codes examples slave addresses slave_addr = 0x 53 // slave address main _ ctr l register // this defines the operating modes of the als ,uv . default setting is 0x00 in standby mode. register_addr = 0x 0 0 // main _ctr l register command = 0x02 // als in active mode // uvs in active mode, command = 0x 0 a writebyte(slave_addr, register_addr, command); a l s _uvs _ meas_rate register // this controls the als/uvs resolution & m easurement rate. // default setting of the register is 0x 22 register_addr = 0x 04 // als_uvs _meas _rate register command = 0x 22 // resolution= 1 8bits, meas rate = 100ms // resolution= 20 bits, meas rate = 5 00ms , command=0x 04 writebyte(slave_addr, register_addr, command) al s _uvs _ gain register // this controls the als/uvs gain . // default setting of the register is 0x 01 register_addr = 0x 05 // als_uvs_gain register command = 0x 01 // gain range=3. // gain range=18 , command=0x04 writebyte(slave_addr, register_addr, command) int_cfg register // this controls the interrupt mode of als, uvs . // default setting of the register is 0x 10 register_addr = 0x 19 // int_cfg register command = 0x 14 // al s_int_en=1. // uvs _int_en=1 , command=0x 34 writebyte(slave_addr, register_addr, command) int_pst register // this controls the persistence of interrupt of als , uvs . // default setting of the register is 0x 00 register_addr = 0x 1a // int_cfg register command = 0x 00 // als/uvs persist=0. // als/uvs persist=1, command=0x1 0 writebyte(slave_addr, register_addr, command)
optical sensor ltr - 390uv - 01 27 / 33 part no. : ltr - 390uv - 01 bns - od - fc002/a4 als _data registers (read only) //the register s 0x 0d, 0x0e & 0x0f contain al s data , up to 20bits . register_addr = 0x 0 d // al s_data _0 address data 1 = readbyte(slave_addr, register_addr) register_addr = 0x 0e // al s_data_1 address data 2 = readbyte(slave_addr, register_addr) register_addr = 0x 0 f // al s_data_ 2 address data 3 = readbyte(slave_addr, register_addr) // als_data=data3*65536+data2*256+data1. uvs _data registers (read only) //the register s 0x 10, 0x11 & 0x12 contain uv s data , up to 20bits . register_addr = 0x 10 // uv s_data _0 address data 1 = readbyte(slave_addr, register_addr) register_addr = 0x 11 // uv s_data_1 address data 2 = readbyte(slave_addr, register_addr) register_addr = 0x 12 // uv s_data_ 2 address data 3 = readbyte(slave_addr, register_addr) // uvs_data=data3*65536+data2*256+data1.
optical sensor ltr - 390uv - 01 28 / 33 part no. : ltr - 390uv - 01 bns - od - fc002/a4 10. 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 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 - 390uv - 01 29 / 33 part no. : ltr - 390uv - 01 bns - od - fc002/a4 11. moisture proof packaging all ltr - 390uv - 01 are shipped 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 storage conditions and soldered within seven days. when the moisture barrier bag is opened and the parts are exposed to the recommended storag e conditions for more than seven days, the parts must be baked before reflow to prevent damage to the parts. 1. recommended storage conditions storage temperature 10 ? c to 30 ? c relative humidity below 60% rh 2. 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 - 390uv - 01 30 / 33 part no. : ltr - 390uv - 01 bns - od - fc002/a4 12. recommended land pattern i. recommended land pattern for ltr - 390uv - 01 note: all dimensions are in millimeters
optical sensor ltr - 390uv - 01 31 / 33 part no. : ltr - 390uv - 01 bns - od - fc002/a4 13. 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 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 - 390uv - 01 32 / 33 part no. : ltr - 390uv - 01 bns - od - fc002/a4 14. 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 - 390uv - 01 33 / 33 part no. : ltr - 390uv - 01 bns - od - fc002/a4 revision table : version update page date 1.0 datasheet as created total 30 2 8 - j ul - 15 1.1 als lux formula updated total 3 3 24 - aug - 15

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