Two sensors in one measure ambient light, proximity

11th June 2019
Mick Elliott

An ambient light and proximity sensor offering very high sensitivity even at millilux-level intensity is in stock at Mouser Electronics. The ams TSL2740 sensor is ideal for smart home assistants, smart watches and wearables, display backlight control, tablets, smartphones, and medical diagnostics applications.

The device combines an ambient light sensor (ALS) and a proximity light-to-digital sensor that approximates the human eye response to light intensity under varying lighting conditions.

Measuring 2mm × 2mm × 0.5mm 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.

Proximity sensing is performed 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.

The device’s ALS 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 converter which converts photodiode current into a 16-bit digital output that can be interfaced with a microprocessor.

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