With the continuous improvement of people's health awareness, all kinds of smart wearable products will basically add health monitoring functions. This solution is a heart rate and blood oxygen detection Sensor Board solution based on ams OSRAM AS7058, which can be used with the main control to measure heart rate and blood oxygen in the field of smart wearables.

This solution communicates with the Sensor Board through Bluetrum BT8958B2, reads the data of AS7058, and cooperates with the ams OSRAM original heart rate algorithm and blood oxygen algorithm to perform dynamic heart rate and static blood oxygen measurement. It can display heart rate and blood oxygen data on the BT8958B2 watch interface, and report heart rate and blood oxygen data through BLE.

The AS7058 Sensor Board solution includes AFE AS7058, Multi Chip LED SFH 7018B, PD SFH 2706, and also adds Level Shift SGM4574YUQN12G/TR, which supports the master control with 3.3V or 1.8V communication level. The hardware design of the solution is shown in the figure below:

▶Scenario application diagram

▶Product entity diagram

▶Display board photo

▶Solution block diagram

Core technology advantages

● Support 3 LEDs, and can open up to 8 PDs at the same time

● 20-bit high-precision ADC for PPG signal sampling

● The chip has a built-in 1.5 KB FIFO, which can store up to 512 PPG data (20 bits)

● The original manufacturer's own dynamic heart rate algorithm and static blood oxygen algorithm

Solution specifications

● Support 1.8V, 3.3V IO level master control

● Support AGC to adjust LED current

● Support I2C communication