Ambient light sensor matches human eye responses

18th April 2019
Source: TTI Europe
Posted By : Mick Elliott
Ambient light sensor matches human eye responses

The VCNL4040 fully integrated proximity and ambient light sensor from Vishay is now available from distributor TTI. Featuring Filtron technology, the sensor combines an IR emitter, photo detectors for proximity and ambient light, a signal processing IC and a 16-bit ADC.

The device is offered in one of the market’s smallest surface-mount packages, at only 4mm x 2mm x 1.1mm. The three-in-one sensor features an interrupt function and supports an I²C bus communications interface, which significantly simplifies window and sensor placement. Suitable applications for the VCNL4040 include home automation, consumer devices, industrial applications, handheld devices, notebooks and tablets.

An accurate ambient light sensor (ALS) offers 16-bit high resolution with sufficient selections to suit the demands of most applications, whether dark or high transparency lens design.

Patented Filtron technology achieves ambient light spectrum sensitivity close to real human eye responses, with fluorescent light flicker immunity.

The proximity function offers immunity to red glow (940nm IRED) and has an intelligent cancellation scheme that effectively reduces crosstalk and a smart persistence scheme to reduce response time.

Both the ALS and proximity sensor (PS) operate in parallel, and can be programmed for high and low interrupt thresholds, so only using minimal amount of microprocessor resource.

Other specifications include operating voltage between 2.5V to 3.6V, temperature compensation of -40deg.C to +85degC. and a low power consumption I²C SMBus compatible interface.

Further resources and free of charge samples can be obtained from TTI. TTI is supporting new design work with suitable demo boards, free of charge test samples and production quantities ex stock TTI.

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