Sensor IC measures heart rate for determining blood pressure, stress and vascular age

February 21, 2018 // By Christoph Hammerschmidt
Japanese chipmaker Rohm has developed an optical heart rate sensor for smart bands and watches, which, thanks to its high-speed 1024 Hz sampling, can be used for measuring blood pressure, stress and vascular age.

The BH1792GLC is the second pulse wave sensor to be developed by this manufacturer, and it is notable for its high detection accuracy and low power consumption of only 0.44mA during measurement. The 1024Hz sampling rate makes it possible to measure the heart rate up to 32 times faster than conventional solutions.

The BH1792GLC measures just 2.8mm x 2.8mm x 0.9mm (W x D x H). In addition to measuring the heart rate, an infrared sensor makes it possible to detect when the device is being worn. An integrated FIFO (First In First Out) memory helps to reduce the power consumption on the host side (MCU), which in turn decreases the power consumed by the sensor and increases the application drive time. The heart rate sensor works with supply voltages from 2.5V to 3.6V. Its operating temperature range is between -20°C and +85°C. The BH1792GLC is the designed as the solution of choice for smart bands, watches, smartphones and other portable devices requiring vital sign sensing. Samples and OEM quantities of the BH1792GLC have been available since December 2017. 

An evaluation board (BH1792GLC-EVK-001) for use with the heart rate sensor is available from the online distributors Chip One Stop, Zyco Store (Core Staff) and RS Components, which can be connected via the ROHM sensor shield with open platform MCU boards such as Arduino Uno. 

Documents and software necessary to use the evaluation board for vital sign sensing can be downloaded from the following URL:  http://www.rohm.com/web/eu/sensor-shield-support/heart-rate-sensor2 

 


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