World’s smallest ambient light sensor for wearables

Posted By : Nat Bowers
World’s smallest ambient light sensor for wearables

Measuring just 1.145x1.66x0.32mm, the TSL2584TSV Ambient Light Sensor (ALS) from ams is claimed to be the world's smallest. In display management applications, automatically controlling the backlight intensity with an ALS ensures the best possible user experience while extending battery life. The TSL2584TSV’s outline and height are approximately half the size of competing ALS devices.

The TSL2584TSV’s near-photopic response produces a highly accurate lux measurement even when mounted behind dark glass. Advanced fabrication technology and the ability to accurately deposit interference filters directly onto the silicon results in a superior performing ALS. Filtering out unwanted IR light enables the sensor to more accurately measure the ambient light thus producing a near-photopic response.

The device is available in a Through-Silicon Via (TSV) package thanks to ams leveraging its wafer fabrication expertise. This TSV package technology improves performance by eliminating use of wire bonds and provides a direct connection from the device I/Os to a solder ball. TSV enhances the device reliability performance with an MSL-1 standard rating, improves humidity temperature-cycling performance while minimising corrosion resistivity.

"By providing the world’s smallest ambient light sensor, ams now enables designers of wearable devices such as smart watches and fitness bands to easily integrate ambient light sensors into the thinnest backlight displays," said David Moon, Senior Marketing Manager, Advanced Optical Solutions division, ams. "The ultra small size of the TSL2584TSV also provides smartphones and tablet developers more design flexibility. With a footprint of less than 2mm2 and a height of only 0.32mm the TSL2584TSV marks a major milestone in the development of ALS solutions, opening up many new options for implementing display management in highly space-constrained designs."

The TSL2584TSV is available now for volume production, priced at $0.58 each in quantities of 1,000 units. A TSL2584TSV evaluation kit is available.

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