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TSL4531 digital ambient light sensor taos112 a ? october 2012 1 the lumenology company copyright 2012 , taos inc. www.taosinc.com features simple direct lux output approximates human eye response in diverse lighting conditions three user-selectable integration times (400 ms, 200 ms, and 100 ms) wide dynamic range ? 3 lux to 220k lux rejects 50 hz/60 hz lighting ripple low active current (110 a typical) with power down mode (2.2 a typical) enables green products 16-bit digital output with i 2 c compatibility ultra-small 2 mm 2 mm chipled package 2.5-v supply voltage with 1.8-v logic interface applications outdoor lighting control ? street lights ? security lights ? traffic signals ? commercial billboards display backlight control ? automotive instrumentation ? cell phones ? tablets and notebooks solid-state and general lighting and daylight harvesting ? commercial lighting ? industrial lighting description the TSL4531 family of devices provides ambient light sensing (als) that approximates human eye response under a variety of lighting conditions. the devices have three selectable integration times and provide a direct 16-bit lux output via an i 2 c bus interface. the wide dynamic range of the als makes it particularly useful in outdoor applications where it is exposed to direct sunlight. the device is ideal for use in automatic control of street lights and security, billboard, and automotive lighting. the TSL4531 devices can also be used in solid state and general lighting for automatic control and daylight harvesting to maximize energy conservation. other applications i nclude display backlight control to extend battery life and optimize visibility in cell phones, tablets, and notebooks. functional block diagram sda v dd scl adc lux calc i 2 c interface photodiode array texas advanced optoelectronic solutions inc. 1001 klein road suite 300 plano, tx 75074 (972) 673-0759 package drawing not to scale package cl chipled (top view) 4 scl 3 sda v dd 1 gnd 2 ams ag technical content still valid
TSL4531 digital ambient light sensor taos112 a ? october 201 2 2 copyright 201 2 , taos inc. the lumenology company www.taosinc.com detailed description the device contains a photodiode array, an integrating analog-to-digital converter (adc), signal processing circuitry, lux calculation logic, and an i 2 c serial interface on a single cmos integrated circuit to provide lux data with a 16-bit output. no external circuitry is required for signal conditioning. the device features power management modes where the user can select continuous operation, power save mode in which the device inserts a power saving state between each acquisition, or single-cycle operation in which the device enters a power-down state after data acquisition. the device has three user-selectable integration times of 100 ms, 200 ms, or 400 ms, allowing the user to adjust the sensitivity of the device. terminal functions terminal type description name no. type description gnd 2 power supply ground. all voltages are referenced to gnd. scl 4 i i 2 c serial clock input terminal. sda 3 i/o i 2 c serial data i/o terminal ? bidirectional. v dd 1 supply voltage. available options device address package ? leads interface description ordering number TSL45311 0x39 cl?4 i 2 c vbus = v dd interfach TSL45311cl TSL45313 0x39 cl?4 i 2 c vbus = 1.8 v interface TSL45313cl TSL45315 0x29 cl?4 i 2 c vbus = v dd interface TSL45315&/ TSL4531 0x2 cl?4 i 2 c vbus = 1.8 v interface TSL45317cl absolute maximum ratings over operating free-air temperature range (unless otherwise noted) ? supply voltage, v dd (note 1) 4.5 v . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . input terminal voltage ?0.5 v to 4.5 v . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . output terminal voltage ?0.5 v to 4.5 v . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . output terminal current ?1 ma to 20 ma . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . storage temperature range, t stg ?40 c to 85 c . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . esd tolerance, human body model 2000 v . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ? stresses beyond those listed under ?absolute maximum ratings? may cause permanent damage to the device. these are stress ratings only, a nd functional operation of the device at these or any other conditions beyond those indicated under ?recommended operating conditions? is not implied. exposure to absolute-maximum-rated conditions for extended periods may affect device reliability. note 1: all voltage values are with respect to gnd. recommended operating conditions min nom max unit supply voltage, v dd 2.3 2.5 3.3 v operating free-air temperature, t a ?15 70 c ams ag technical content still valid
TSL4531 digital ambient light sensor taos112 a ? october 201 2 3 the lumenology company copyright 201 2 , taos inc. www.taosinc.com operating characteristics, v dd = 2.5 v, t a = 25 c (unless otherwise noted) parameter test conditions min typ max unit i supply current active (note 1) 110 130 a i dd supply current power down ? no i 2 c activity 2.2 4 a i leak leakage current, sda and scl pins ?5 5 a v scl sda input high voltage TSL45311, TSL45315 0.7 v dd v v ih scl, sda input high voltage TSL45313, TSL45317 1.25 v v scl sda input low voltage TSL45311, TSL45315 0.3 v dd v v il scl, sda input low voltage TSL45313, TSL45317 0.54 v note 1: the average supply current will be slightly lower when psaveskip = 0. als characteristics, v dd = 2.5 v, t a = 25 c, tcntrl = 1 (tint = 400 ms) (unless otherwise noted) parameter test conditions min typ max unit adc count value 0 65535 counts p = white led, cct = 4000k, e v = 1000 lux 1000 adc count value p = 880 nm + 940 nm, e e = 345 w/cm 2 (note 1) 3 counts adc count value ratio inc std a/fluorescent f12 (notes 2 & 4) 80 120 % sensor output responsivity p = white led, cct = 4000k 0.8 1 1.2 count/lux dynamic range incandescent light source: std a (notes 3 & 4) 3 220k lux temperature coefficient ?15 c to 0 c ?0.25 0 %/ c temperature coefficient 0 c to 70 c ?0.20 0 % / c tcntrl = 10 96 100 104 integration time tcntrl = 01 192 200 208 ms integration time tcntrl = 00 384 400 416 ms tcntrl = 10, psaveskip = 0 (note 5) 110.4 115 119.6 total cycle time tcntrl = 01, psaveskip = 0 (note 5) 220.8 230 239.2 ms total cycle time tcntrl = 00, psaveskip = 0 (note 5) 441.6 460 478.4 ms notes: 1. combination of ir leds used with peak wavelengths of 880 nm and 940 nm for ir rejection production test. 2. incandescent std a light source at 300 lux. fluorescent f12 light source at 300 lux. 3. 220,000 lux reading possible with tcntrl set to 4 multiplier (tint = 100 ms). 4. not tested in production. 5. when psaveskip = 1, total cycle time equals integration time. ams ag technical content still valid
TSL4531 digital ambient light sensor taos112 a ? october 201 2 4 copyright 201 2 , taos inc. the lumenology company www.taosinc.com ac electrical characteristics, v dd = 2.5 v, t a = 25 c (unless otherwise noted) parameter ? test conditions min typ max unit f (scl) clock frequency 400 khz t (buf) bus free time between start and stop condition 4.7 s t (hdsta) hold time after (repeated) start condition. after this period, the first clock is generated. 4 s t (susta) repeated start condition setup time 4.7 s t (susto) stop condition setup time 4 s t (hddat) data hold time 300 ns t (sudat) data setup time 250 ns t (low) scl clock low period 4.7 s t (high) scl clock high period 4 s t (timeout) detect clock/data low timeout 25 35 ms t f clock/data fall time 300 ns t r clock/data rise time 1000 ns c i input pin capacitance 10 pf ? specified by design and characterization ? not production tested. parameter measurement information start condition stop condition p sda t (susto) t (sudat) t (hddat) t (buf) v ih v il scl t (susta) t (high) t (f) t (r) t (hdsta) t (low) v ih v il ps s figure 1. timing diagrams ams ag technical content still valid
TSL4531 digital ambient light sensor taos112 a ? october 201 2 5 the lumenology company copyright 2012 , taos inc. www.taosinc.com typical characteristics figure 2 300 500 700 900 1100 ? wavelength ? nm normalized spectral responsivity 10 20 30 40 50 60 70 80 90 100 0 photoptic 4531 normalized responsivity figure 3 normalized responsivity vs. angular displacement ? cl package ? angular displacement ? normalized responsivity 0 0.2 0.4 0.6 0.8 1.0 ?90 ?60 ?30 0 30 60 90 optical axis figure 4 i dd vs. v dd v dd ? v i dd ? a 2.2 2.4 2.6 2.8 3 3.2 80 90 100 110 120 130 140 150 160 3.4 70 c 25 c ?15 c figure 5 output vs illuminance 1 100 10k 1000k output ? counts illuminance ? lux 1 100 10k 1000k ams ag technical content still valid
TSL4531 digital ambient light sensor taos112 a ? october 201 2 6 copyright 201 2 , taos inc. the lumenology company www.taosinc.com principles of operation analog-to-digital converter the TSL4531 contains one integrating analog-to-digital converter (adc) that integrates the current from the photodiode array. upon completion of the conversion cycle, the conversion result is transferred to the data registers. transfers are double-buffered to ensure that invalid data is not read during the transfer. after the transfer, the device will either automatically begin another integration cycle, or enter power-down mode, depending upon the mode setting in the control register. the device features several key power management features. the mode of operation can be controlled to provide either continuous operation or single acquisition operation followed by a power-down state. in the continuous operation, a secondary mode can be enabled allowing the device to go into a low-power state in between each acquisition cycle. the device allows the user to control the integration time. this enables the user to control the sensitivity of the device to allow for the greater dynamic range needed in bright lighting conditions such as sunlight. integration times of 400 ms, 200 ms, or 100 ms are available. all integration times are multiples of 50 ms, allowing rejection of 50/60-hz ripple present in a typical fluorescent lights. the lux output needs to be scaled depending on the integration time as shown in the calculating lux section. calculating lux the adc output is a 16-bit number that is directly proportional to the value that approximates the human eye response in the commonly used illuminance unit of lux. the light level can be calculated using the following expression. light level (lux) = multiplier [ (datahigh << 8) + datalow ] where: multiplier = 1 for tcntrl = 00 (tint = 400 ms), multiplier = 2 for tcntrl = 01 (tint = 200 ms), and multiplier = 4 for tcntrl = 10 (tint = 100 ms), and << 8 indicates a logical 8-bit shift left operation, and tcntrl is a 2-bit field in the configuration register (0x01) example: multiplier = 1 datalow = 0x9c datahigh = 0x63 illuminance = 1 [ (datahigh << 8) + datalow] lux = (0x63 << 8) + 0x9c lux = 0x639c lux = 25,500 lux ams ag technical content still valid
TSL4531 digital ambient light sensor taos112 a ? october 201 2 7 the lumenology company copyright 201 2 , taos inc. www.taosinc.com i 2 c protocol interface and control are accomplished through an i 2 c serial compatible interface (standard or fast mode) to a set of registers that provide access to device control functions and output data. the devices support the 7-bit i 2 c addressing protocol. the i 2 c standard provides for three types of bus transaction: read, write, and a combined protocol (figure 6). during a write operation, the first byte written is a command byte followed by data. in a combined protocol, the first byte written is the command byte followed by reading a series of bytes. if a read command is issued, the register address from the previous command will be used for data access. likewise, if the msb of the command is not set, the device will write a series of bytes at the address stored in the last valid command with a register address. the command byte contains either control information or a 5-bit register address. the control commands can also be used to clear interrupts. the i 2 c bus protocol was developed by philips (now nxp). for a complete description of the i 2 c protocol, please review the nxp i 2 c design specification at http ://www.i2c?bus.org/references/. a acknowledge (0) n not acknowledged (1) p stop condition r read (1) s start condition sr repeated start condition w write (0) ... continuation of protocol master-to-slave slave-to-master w 7 data byte slave address s 1 aa a 8 11 1 8 command code 1 p 1 ... i 2 c write protocol i 2 c read protocol i 2 c read protocol ? combined format r 7 data slave address s 1 aa a 8 11 1 8 data 1 p 1 ... w 7 slave address slave address s 1 ar a 8 11 1 7 11 command code sr 1 a data a a 81 8 data 1 p 1 ... figure 6. i 2 c protocols ams ag technical content still valid
TSL4531 digital ambient light sensor taos112 a ? october 201 2 8 copyright 2012 , taos inc. the lumenology company www.taosinc.com register set the device is controlled and monitored by data registers and a command register accessed through the serial interface. these registers provide for a variety of control functions and can be read to determine results of the adc conversions. table 1. register set address resister name r/w register function reset value ?? command w specifies register address 0x00 0x00 control r/w power on/off and single cycle 0x00 0x01 config r/w powersave enable / integration time 0x00 0x04 datalow r als data low register 0x00 0x05 datahigh r als data high register 0x00 0x0a id r device id id the mechanics of accessing a specific register depends on the specific protocol used. see the section on i 2 c protocols on the previous pages. in general, the command register is written first to specify the specific control/status register for following read/write operations. there are 16 register locations, but only 5 registers are implemented. to make the register read process more efficient when reading multiple bytes of data as in the combined format protocol, the address index pointer is automatically incremented to skip over the unused registers, as shown in figure 7. 0 1 2 3 4 5 6 7 8 9 a b c d e f address in hex address increments by 1 except where noted: cycle is 0h, ah, bh, ch, dh, 0h figure 7. combined format read cycle pattern command register the command register specifies the address of the target register for future write and read operations. it contains two user fields as described below and defaults to 0x00 at power-on. table 2. command register 6 754 address 2 310 command command reserved field bits description command 7 select command register. must write as 1. reserved 6:4 reserved. write as 0. address 3:0 address register. selects the specific register for write and read transactions that follow. ams ag technical content still valid
TSL4531 digital ambient light sensor taos112 a ? october 201 2 9 the lumenology company copyright 2012 , taos inc. www.taosinc.com control register (0x00) the control register is used to power the device on/off and single cycle. table 3. control register 6 7542 310 control reset 0x00 mode reserved field bits description reserved 7:2 reserved. write as 0. mode 1:0 operating mode. this two-bit field controls the mode of the device: field value function 00 power down 01 reserved 10 run a single adc cycle and return to powerdown 11 normal operation configuration register (0x01) the configuration register controls the integration timer and power saving enabling through two user fields. table 4. configuration register 6 7542 310 config reserved reset 0x00 tcntrl psaveskip reserved field bits description reserved 7:4 reserved. write as 0. psaveskip 3 powersave mode. when asserted, the power save states are skipped following a light integration cycle for shorter sampling rates (note a). reserved 2 reserved. write as 0. tcntrl 1:0 timer control sets the integration time. field value multiplier purpose 00 1 t int = 400 ms 01 2 t int = 200 ms 10 4 t int = 100 ms 11 ?? reserved notes: a. when psaveskip = 0, the typical total cycle time is t int + (60/multiplier) ms. when psaveskip = 1, the typical total cycle time is t int . ams ag technical content still valid
TSL4531 digital ambient light sensor taos112 a ? october 201 2 10 copyright 201 2 , taos inc. the lumenology company www.taosinc.com als data registers (0x04 ? 0x05) the adc data is expressed as a 16-bit word stored in two 8-bit registers. the read-only adc data registers datalow and datahigh provide the low and high bytes, respectively, of the 16-bit adc conversion value. the conversion value translates directly to units of lux. table 5. als data registers register address bits description datalow 0x04 7:0 adc conversion low byte datahigh 0x05 7:0 adc conversion high byte id register (0x0a) the id register is a read-only register that provides the value for the part number. the partno field indicates the part number of each device given in the available options section and will remain constant. table 6. id register 6 7542 310 control reset id partno reserved field bits description field value device part number 1000 TSL45317 partno 7:4 1001 TSL45313 partno 7:4 1010 TSL45315 1011 TSL45311 reserved 3:0 reserved the id register is useful for validating the device type and for verifying the functionality of the interface. when used for this purpose, it is recommended that the reserved field be masked out as follows: value = id and 0xf0, where and represents a bit-wise and function ams ag technical content still valid
TSL4531 digital ambient light sensor taos112 a ? october 2012 11 the lumenology company copyright 201 2 , taos inc. www.taosinc.com hardware application information power supply decoupling the power supply lines must be decoupled with a 0.1- f capacitor placed as close to the device package as possible. the bypass capacitor should have low effective series resistance (esr) and effective series inductance (esi), such as the common ceramic types, which provide a low impedance path to ground at high frequencies to handle transient currents caused by internal logic switching. pcb pad layout suggested pcb pad layout guidelines for the cl p ackage is shown in figure 8. 0.70 1.35 1.2 0.85 0.95 0.55 notes: a. all linear dimensions are in millimeters. b. this drawing is subject to change without notice. figure 8. suggested cl package pcb layout ams ag technical content still valid
TSL4531 digital ambient light sensor taos112 a ? october 201 2 12 copyright 2012 , taos inc. the lumenology company www.taosinc.com package information package cl chipled 0.60 0.30 0.15 1.35 0.7 0.1 1.2 pb top view end view bottom view pin out top view 4 scl 3 sda v dd 1 gnd 2 2.0 0.1 pin 1 (note e) pin 1 0.3 min 2.0 0.1 photodiode array area 0.10 0.45 0.277 nominal 0.277 nominal c l of solder contacts and photodiode array area (note b) c l of solder contacts and photodiode array area (note b) notes: a. all linear dimensions are in millimeters. b. the die is offset within the package to center the photodiode array to the solder contacts within a tolerance of 50 m. c. package top surface is molded with an electrically nonconductive yellow clear plastic compound having an index of refraction of 1.55. d. contact finish is copper alloy a194 with pre-plated nipdau lead finish. e. bottom pin 1 indicator is electrically connected to pin 1. f. this package contains no lead (pb). g. this drawing is subject to change without notice. figure 9. package cl ? chipled packaging configuration ams ag technical content still valid
TSL4531 digital ambient light sensor taos112 a ? october 2012 13 the lumenology company copyright 201 2 , taos inc. www.taosinc.com carrier tape and reel information top view detail a 2.18 0.05 a o 0.254 0.02 5 max 4.00 8.00 3.50 0.05 1.50 4.00 2.00 0.05 + 0.30 ? 0.10 1.75 b b aa 1.00 0.25 detail b 2.18 0.05 b o 5 max 0.83 0.05 k o notes: a. all linear dimensions are in millimeters. dimension tolerance is 0.10 mm unless otherwise noted. b. the dimensions on this drawing are for illustrative purposes only. dimensions of an actual carrier may vary slightly. c. symbols on drawing a o , b o , and k o are defined in ansi eia standard 481?b 2001. d. each reel is 178 millimeters in diameter and contains 3500 parts. e. taos packaging tape and reel conform to the requirements of eia standard 481?b. f. in accordance with eia standard, device pin 1 is located next to the sprocket holes in the tape. g. this drawing is subject to change without notice. figure 10. package cl carrier tape ams ag technical content still valid
TSL4531 digital ambient light sensor taos112 a ? october 201 2 14 copyright 201 2 , taos inc. the lumenology company www.taosinc.com soldering information the cl package has been tested and has demonstrated an ability to be reflow soldered to a pcb substrate. the solder reflow profile describes the expected maximum heat exposure of components during the solder reflow process of pr oduct on a pcb. temperature is measured on top of component. the components should be limited to a maximum of three passes through this solder reflow profile. table 7. solder reflow profile parameter reference device average temperature gradient in preheating 2.5 c/sec soak time t soak 2 to 3 minutes time above 217 c (t1) t 1 max 60 sec time above 230 c (t2) t 2 max 50 sec time above t peak ?10 c (t3) t 3 max 10 sec peak temperature in reflow t peak 260 c temperature gradient in cooling max ?5 c/sec t 3 t 2 t 1 t soak t 3 t 2 t 1 t peak not to scale ? for reference only time (sec) temperature ( c) figure 11. solder reflow profile graph ams ag technical content still valid
TSL4531 digital ambient light sensor taos112 a ? october 2012 15 the lumenology company copyright 2012 , taos inc. www.taosinc.com storage information moisture sensitivity optical characteristics of the device can be adversely affected during the soldering process by the release and vaporization of moisture that has been previously absorbed into the package. to ensure the package contains the smallest amount of absorbed moisture possible, each device is baked prior to being dry packed for shipping. devices are dry packed in a sealed aluminized envelope called a moisture-barrier bag with silica gel to protect them from ambient moisture during shipping, handling, and storage before use. shelf life the calculated shelf life of the device in an unopened moisture barrier bag is 12 months from the date code on the bag when stored under the following conditions: shelf life: 12 months ambient t emperature: < 40 c relative humidity: < 90% rebaking of the devices will be required if the devices exceed the 12 month shelf life or the humidity indicator card shows that the devices were exposed to conditions beyond the allowable moisture region. floor life the cl package has been assigned a moisture sensitivity level of msl 3. as a result, the floor life of devices removed from the moisture barrier bag is 168 hours from the time the bag was opened, provided that the devices are stored under the following conditions: floor life: 168 hours ambient t emperature: < 30 c relative humidity: < 60% if the floor life or the temperature/humidity conditions have been exceeded, the devices must be rebaked prior to solder reflow or dry packing. rebaking instructions when the shelf life or floor life limits have been exceeded, rebake at 50 c for 12 hours. ams ag technical content still valid
TSL4531 digital ambient light sensor taos112 a ? october 201 2 16 copyright 201 2 , taos inc. the lumenology company www.taosinc.com production data ? information in this document is current at publication date. products conform to specifications in accordance with the terms of texas advanced optoelectronic solutions, inc. standard warranty. production processing does not necessarily include testing of all parameters. lead-free (pb-free) and green statement pb-free (rohs) taos? terms lead-free or pb-free mean semiconductor products that are compatible with the current rohs requirements for all 6 substances, including the requirement that lead not exceed 0.1% by weight in homogeneous materials. where designed to be soldered at high temperatures, taos pb-free products are suitable for use in specified lead-free processes. green (rohs & no sb/br) taos defines green to mean pb-free (rohs compatible), and free of bromine (br) and antimony (sb) based flame retardants (br or sb do not exceed 0.1% by weight in homogeneous material). important information and disclaimer the information provided in this statement represents taos? knowledge and belief as of the date that it is provided. taos bases its knowledge and belief on information provided by third parties, and makes no representation or warranty as to the accuracy of such information. efforts are underway to better integrate information from third parties. taos has taken and continues to take reasonable steps to provide representative and accurate information but may not have conducted destructive testing or chemical analysis on incoming materials and chemicals. taos and taos suppliers consider certain information to be proprietary, and thus cas numbers and other limited information may not be available for release. notice texas advanced optoelectronic solutions, inc. (t aos) reserves the right to make changes to the products contained in this document to improve performance or for any other purpose, or to discontinue them without notice. customers are advised to contact taos to obtain the latest product information before placing orders or designing taos products into systems. taos assumes no responsibility for the use of any products or circuits described in this document or customer product design, conveys no license, either expressed or implied, under any patent or other right, and makes no representation that the circuits are free of patent infringement. taos further makes no claim as to the suitability of its products for any particu lar purpose, nor does taos assume any liability arising out of the use of any product or circuit, and specifically disclaims any and all liability, including without limitation consequential or incidental damages. texas advanced optoelectronic solutions, inc. products are not designed or intended for use in critical applications in which the failure or malfunction of the taos product may result in personal injury or death. use of t aos products in life support systems is expressly unauthorized and any such use by a customer is completely at the customer?s risk. lumenology, taos, the taos logo, and texas advanced optoelectronic solutions are registered trademarks of texas advanced optoelectronic solutions incorporated. ams ag technical content still valid

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