Ambient light sensor matches eye-response
The ALS sensor features 2 output channels, visible and infrared (IR). The visible channel has a photodiode with a photopic Interferometric UV and IR blocking filter and the IR channel has a photodiode with an IR pass filter. Each channel has a dedicated integrating data converter which converts photodiode current into a 16-bit digital output. This digital output can be interfaced with a microprocessor where illuminance in lux is derived to accurately measure ambient light to control a displays backlight.
Features include; integrated on-chip photopic filter; sensitivity down to mLux levels; 0.18 µm process technology with 1.8V I²C interface; 1M:1 dynamic range; and automatic AUTO Zero/Dark Count control.
The device provides near photopic responsiveness, giving design flexibility for dark glass and physical placement; it reduces power consumption, with dark room to sunlight operation, and eliminates system electrical background noise. It operated from 1.7 to 2.0V, is programmable for gain, integration time, and for threshold to generate an interrupt. Maximum lux value is 1.3.
Use the part, ams suggests, in home assistants, smartwatch wearables, and for display backlight control in a range of products.
An evaluation kit that contains everything needed to quickly assess the part’s performance, is available.
ams; https://ams.com/eng/Products/Light-Sensors/Ambient-Light-Sensors/TSL2540
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