TSL4531 Digital Ambient Light Sensor The TSL4531 family of devices provides ambient light sensing General Description (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 IC 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. Ordering Information and Content Guide appear at end of datasheet. Key Benefits & Features The benefits and features of this device are listed below: Figure 1: Added Value of Using TSL4531 Benefits Features Requires no Lux Equation Software Calculations Simple Direct Lux Output Enables Automatic Display Brightness Control for Approximates Human Eye Response in Diverse Reduced Total System Power Consumption Lighting Conditions Enables Application Versatility in Varying Lighting Three UserSelectable Integration Times Environments (100 ms, 200 ms and 400 ms) Enables 3 Lux to 220k Lux Bright Sunlight Wide Dynamic Range Operation Multiple Integration Times Enables the Rejection of Rejects 50 Hz/60 Hz Lighting Ripple 50 Hz/60 Hz Lighting Ripples Low Active Current (110 A typical) with Power Enabling a Low Active and Power-Down Modes Down Mode (2.2 A typical) Enables Green Reduces Average Power Consumption Products Digital Interfaces are Less Susceptible to Noise 16bit Digital Output with IC Compatibility Reduces Board Space Requirements while UltraSmall 2 mm 2 mm ChipLED (CL) Package Simplifying Designs 2.5 V Power Rail Enables Low-Power Operation 2.5V Supply Voltage with 1.8V Logic Interface ams Datasheet Page 1 v1-00 2016-Aug-31 Document FeedbackT S L4 531 Gen e ra l De s c rip t ion Applications The applications of TSL4531 include: Outdoor Lighting Control Street Lights Security Lights Traffic Signals Commercial Billboards Display Backlight Control Automotive Instrumentation Cell Phones Tablets and Notebooks SolidState and General Lighting and Daylight Harvesting Commercial Lighting Industrial Lighting Block Diagram The functional blocks of this device are shown below: Figure 2: Functional Block Diagram V DD SCL SDA Photodiode Array Detailed Description The device contains a photodiode array, an integrating analog-to-digital converter (ADC), signal processing circuitry, lux calculation logic, and an IC 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 mode, single data acquisition cycle operation mode, and power savings mode by which the device enters a power savings state between data acquisitions. 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. Page 2 ams Datasheet Document Feedback v1-00 2016-Aug-31 ADC Lux Calc IC Interface