Sensors

Ambient light sensor offers dynamic range to 228 klux

21st October 2021
Mick Elliott

An AEC-Q100-qualified ambient light sensor for automotive and consumer applications has been released by the Optoelectronics Group of Vishay Intertechnology.

It is for use where very high sensitivity is needed for sensing light through dark cover materials.

The Vishay Semiconductors VEML6031X00 features a highly sensitive photodiode, low noise amplifier, 16-bit ADC, and infrared channel in a miniature, opaque 2.67mm by 2.45mm surface-mount package with a low 0.6mm profile.

The Automotive Grade device enables ambient light spectral sensitivity close to that of the human eye.

The sensor offers detection with highly linear behaviour from 0 lx to 228 klux – eliminating the need for a correction formula – while its resolution down to 0.0034 lx/ct allows for operation in applications with low transmittance (dark) lens designs.

An IR channel enables light source detection and sensitivity adjustments to compensate for lux errors.

Offering a high operating temperature range to 110°C and a robust package with an improved signal to noise ratio, the device will be used for display backlight controls, infotainment systems, rearview mirror dimming, interior lighting control systems, and heads-up displays.

The sensor supports the easy to use I²C bus communication interface for these applications and offers an interrupt function.

The flexible device supports multiple slave addresses for applications requiring more than one sensor, while a selectable integration time down to 3.125 ms allows for fast response times.

The sensor provides excellent temperature compensation to maintain stability despite changes in ambient temperature and features low shut down current consumption of 0.5 μA typical.

The VEML6031X00 features a supply voltage range of 2.5V to 3.6V and I²C bus voltage range of 1.7V to 3.6V.

RoHS-compliant, halogen-free, and Vishay Green, the device offers a Moisture Sensitivity Level of 2a and a floor life of four weeks in accordance with J-STD-020.

Samples and production quantities of the new ambient light sensor are available now, with lead times of eight to 12 weeks for large orders.

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