TSL45317CL

TSL4531 DIGITAL AMBIENT LIGHT SENSOR r r TAOS112 − OCTOBER 2011 PACKAGE CL ChipLED (TOP VIEW) Features D Simple Direct Lux Output D Approximates Human Eye Response in Diverse Lighting Conditions VDD 1 4 SCL GND 2 3 SDA D Three User-Selectable Integration Times (400 ms, 200 ms, and 100 ms) D Wide Dynamic Range — 3 lux to 220k lux D Rejects 50 Hz/60 Hz Lighting Ripple D Low Active Current (110 A typical) with Package Drawing Not to Scale Applications Power Down Mode (2.2 A typical) Enables Green Products 16-bit Digital Output with I2C Compatibility Ultra-Small 2 mm  2 mm ChipLED package D Outdoor Lighting Control D D D 2.5-V Supply Voltage with 1.8-V Logic Interface D D − 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 I2C 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 include display backlight control to extend battery life and optimize visibility in cell phones, tablets, and notebooks. Functional Block Diagram I2C Interface Lux Calc ADC VDD SCL SDA Photodiode Array The LUMENOLOGY r Company Copyright E 2011, TAOS Inc. r Texas Advanced Optoelectronic Solutions Inc. 1001 Klein Road S Suite 300 S Plano, TX 75074 S (972) r 673-0759 www.taosinc.com 1 TSL4531 DIGITAL AMBIENT LIGHT SENSOR TAOS112 − OCTOBER 2011 Detailed Description The device contains a photodiode array, an integrating analog-to-digital converter (ADC), signal processing circuitry, lux calculation logic, and an I2C 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 NAME NO. TYPE GND 2 SCL 4 I SDA 3 I/O VDD 1 DESCRIPTION Power supply ground. All voltages are referenced to GND. I2C serial clock input terminal. I2C serial data I/O terminal — bidirectional. Supply voltage. Available Options DEVICE ADDRESS INTERFACE DESCRIPTION ORDERING NUMBER 0x39 CL−4 I2C Vbus = VDD Interface TSL45311CL TSL45313† 0x39 CL−4 I2C Vbus = 1.8 V Interface TSL45313CL TSL45315† 0x29 CL−4 I2C Vbus = VDD Interface TSL45315CL CL−4 I2C TSL45317CL TSL45317 † PACKAGE − LEADS TSL45311† 0x29 Vbus = 1.8 V Interface Contact TAOS for availability. Absolute Maximum Ratings over operating free-air temperature range (unless otherwise noted)† Supply voltage, VDD (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, Tstg . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . −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, and 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 Supply voltage, VDD Operating free-air temperature, TA Copyright E 2011, TAOS Inc. NOM MAX 2.3 2.5 3.3 V 70 °C −15 UNIT The LUMENOLOGY r Company r r 2 MIN www.taosinc.com TSL4531 DIGITAL AMBIENT LIGHT SENSOR TAOS112 − OCTOBER 2011 Operating Characteristics, VDD = 2.5 V, TA = 25C (unless otherwise noted) PARAMETER IDD Supply current ILEAK Leakage current, SDA and SCL pins VIH SCL SDA input high voltage SCL, VIL SCL SDA input low voltage SCL, TEST CONDITIONS MIN TYP MAX Active (Note 1) 110 130 Power down — no I2C activity 2.2 4 −5 TSL45311, TSL45315 0.7 VDD TSL45313, TSL45317 1.25 5 UNIT μA μA V TSL45311, TSL45315 0.3 VDD TSL45313, TSL45317 0.54 V NOTE 1: The average supply current will be slightly lower when PSAVESKIP = 0. ALS Characteristics, VDD = 2.5 V, TA = 25C, TCNTRL = 1 (Tint = 400 ms) (unless otherwise noted) PARAMETER TEST CONDITIONS MIN ADC count value 0 λp = white LED, CCT = 4000K, EV = 1000 lux λp = 880 nm + 940 nm, Ee = 345 μW/cm2 (Note 1) ADC count value ratio Inc std A/Fluorescent F12 (Notes 2 & 4) 80 Sensor output responsivity λp = white LED, CCT = 4000K 0.8 Dynamic range Incandescent light source: STD A (Notes 3 & 4) Temperature coefficient Integration time Total cycle time MAX UNIT 65535 counts 1000 ADC count value NOTES: 1. 2. 3. 4. 5. TYP 3 1 counts 120 % 1.2 count/lux 3 220k −15°C to 0°C −0.25 0 0°C to 70°C −0.20 0 TCNTRL = 10 96 100 104 TCNTRL = 01 192 200 208 TCNTRL = 00 384 400 416 TCNTRL = 10, PSAVESKIP = 0 (Note 5) 110.4 115 119.6 TCNTRL = 01, PSAVESKIP = 0 (Note 5) 220.8 230 239.2 TCNTRL = 00, PSAVESKIP = 0 (Note 5) 441.6 460 478.4 lux % / °C ms ms Combination of IR LEDs used with peak wavelengths of 880 nm and 940 nm for IR rejection production test. Incandescent STD A light source at 300 lux. Fluorescent F12 light source at 300 lux. 220,000 lux reading possible with TCNTRL set to 4× MULTIPLIER (Tint = 100 ms). Not tested in production. When PSAVESKIP = 1, total cycle time equals integration time. The LUMENOLOGY r Company Copyright E 2011, TAOS Inc. r r www.taosinc.com 3 TSL4531 DIGITAL AMBIENT LIGHT SENSOR TAOS112 − OCTOBER 2011 AC Electrical Characteristics, VDD = 2.5 V, TA = 25C (unless otherwise noted) PARAMETER† TEST CONDITIONS MIN TYP MAX UNIT 400 kHz f(SCL) Clock frequency t(BUF) Bus free time between start and stop condition 4.7 μs t(HDSTA) Hold time after (repeated) start condition. After this period, the first clock is generated. 4 μs t(SUSTA) Repeated start condition setup time 4.7 μs t(SUSTO) Stop condition setup time 4 μs t(HDDAT) Data hold time 300 ns t(SUDAT) Data setup time 250 ns t(LOW) SCL clock low period 4.7 μs t(HIGH) SCL clock high period 4 μs t(TIMEOUT) Detect clock/data low timeout tF tR Ci Input pin capacitance † 25 35 ms Clock/data fall time 300 ns Clock/data rise time 1000 ns 10 pF Specified by design and characterization — not production tested. PARAMETER MEASUREMENT INFORMATION t(LOW) t(R) t(F) VIH SCL VIL t(HDSTA) t(BUF) t(HIGH) t(HDDAT) t(SUSTA) t(SUSTO) t(SUDAT) VIH SDA VIL P Stop Condition S S P Start Condition Figure 1. Timing Diagrams Copyright E 2011, TAOS Inc. The LUMENOLOGY r Company r r 4 www.taosinc.com TSL4531 DIGITAL AMBIENT LIGHT SENSOR TAOS112 − OCTOBER 2011 TYPICAL CHARACTERISTICS NORMALIZED RESPONSIVITY vs. ANGULAR DISPLACEMENT — CL PACKAGE NORMALIZED SPECTRAL RESPONSIVITY 100 1.0 90 Photoptic 70 60 4531 50 40 30 Optical Axis 0.8 Normalized Responsivity Normalized Responsivity 80 0.6 0.4 20 0.2 10 0 300 500 700 900 λ − Wavelength − nm 0 −90 1100  −60  −30 0 30 60  − Angular Displacement − ° Figure 2 90 Figure 3 IDD vs. VDD OUTPUT vs ILLUMINANCE 160 1000k 150 Output — Counts 140 IDD — A 130 25C 120 70C −15C 110 10k 100 100 90 80 2.2 1 2.4 2.6 2.8 3 3.2 3.4 100 1 VDD − V Figure 4 The LUMENOLOGY r Company 10k 1000k Illuminance — lux Figure 5 Copyright E 2011, TAOS Inc. r r www.taosinc.com 5 TSL4531 DIGITAL AMBIENT LIGHT SENSOR TAOS112 − OCTOBER 2011 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