Mouser Electronics stocks the TSL2740 combined ambient light and proximity sensor from ams. Measuring 2 x 2 x 0.5mm, this sensor offers very high sensitivity, detecting ambient light even at millilux-level intensity, and is ideal for smartwatches and wearables, smartphones, tablets, display backlight control, smart home assistants and medical diagnostics applications.

It combines an ambient light sensor and a proximity light-to-digital sensor that approximates the human eye response to light intensity under varying lighting conditions. It features a wide dynamic range to operate effectively in a broad spectrum of lighting conditions, transforming light intensity to a digital signal output through a 1.8V I2C interface.

The TSL2740 performs proximity sensing by measuring reflected IR light emitted from an external LED. The proximity engine features automatic ambient light subtraction, as well as offset adjustment registers to compensate for unwanted IR energy reflection at the sensor at a range of up to 10cm.

Its ambient light sensor features two output channels: a visible channel and an IR channel. The visible channel has a photodiode with a photopic interferometric UV- and IR-blocking filter. The IR channel has a photodiode with an IR pass filter. Each channel has a dedicated integrating data convertor which converts photodiode current into a 16-bit digital output that can be interfaced with a microprocessor.

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