Wearable multi-sensor reference design with Bluetooth 5
This reference design from Texas Instruments enables a wearable, optimised saturation of peripheral capillary oxygen (SpO2) and multi-sensor, multi-wavelength optical heart rate monitor (HRM). It uses AFE4420 device, which is a single-chip, bio-sensing front end for photoplethysmography (PPG) measurements.
It supports up to four switching light-emitting diodes (LEDs) and up to four photodiodes to enable signal acquisition of up to 16 Phases. The CC2640R2F device (supporting Bluetooth low energy 4.2 and 5) transfers the measured data to a remote location.
This patient-monitoring design uses a single CR3032 battery with a 30-day life cycle. Raw data is available to calculate heart rate, SpO2, and other related parameters. Two onboard light-emitting diodes (LEDs) identify low-battery detection and a Bluetooth connection.
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