Description

The TSL2580 and TSL2581 are very-high sensitivity light-to-digital converters that transform light intensity to a digital signal output capable of direct I2C (TSL2581) or SMBus (TSL2580) interface. Each device combines one broadband photodiode (visible plus infrared) and one infrared-responding photodiode on a single CMOS integrated circuit capable of providing a near-photopic response over an effective 16-bit dynamic range (16-bit resolution). Two integrating ADCs convert the photodiode currents to a digital output that represents the irradiance measured on each channel. This digital output can be input to a microprocessor where illuminance (ambient light level) in lux is derived using an empirical formula to approximate the human eye response. The TSL2580 device permits an SMB-Alert style interrupt, and the TSL2581 device supports a traditional level style interrupt that remains asserted until the firmware clears it.

Features

● Approximately 30x More Sensitive Than the TSL2560/61 Device

● Approximates Human Eye Response

● Programmable ALS Interrupt Function with User-Defined Upper and Lower Threshold Settings

● 16-Bit Digital Output with SMBus (TSL2580) at 100 kHz or I2C (TSL2581) Fast-Mode at 400 kHz

● Programmable Analog Gain and Integration Time Supporting 1,000,000-to-1 Dynamic Range

● Available in Ultra-Small 1.25 mm x 1.75 mm Chipscale Package

● Automatically Rejects 50/60-Hz Lighting Ripple

● Low Quiescent Current 3 μA in Power Down Mode

● RoHS Compliant

Applications

● Ambient Light Sensor (ALS) for Smart Phones, Digital Photo Frames, and Portable Navigation Systems

● ALS for LED Signs, Laptop Computers, and LCD TVs