Heart rate optical sensor slashes power consumption

February 21, 2017 // By Julien Happich
Optimized for wearable devices, the BH1790GLC heart rate optical sensor from Rohm leverages proprietary analogue circuit technology and optical sensor expertise to improve sensitivity, allowing pulse waves to be detected with high accuracy, even with low LED brightness.

A specialized optical filter enables high accuracy detection, extending battery life while reducing the effects of IR rays ten folds versus conventional products. This makes it possible to acquire high quality pulse signals even in environments with strong IR presence, such as outdoors, or under intense movements.

Thanks to this optimization, the 2.8x2.8x0.9mm device is claimed to reduce power consumption by approximately 74%, contributing to longer battery life in wearable devices. The BH1790GLC is capable of detecting high quality pulse signals using low VF low brightness LED elements, eliminating the need for DC/DC circuits for LED power supply conventionally required. This decreases mounting area by 30%, lightening development load, says Rohm. The company also provides an optical heart rate monitor expansion board (BH1790GLC-EVK-001) that can collect and process sensor information by connecting to an open platform (general MCU board) such as Arduino Uno.

Visit Rohm at www.rohm.com