Weltrend | Products

Application-specific MCUs

WTHRM121

WTHRM121, a heart rate monitoring MCU, is using PPG (Photoplethysmographic) technology for the applications of continuous heart rate measurement. It includes CPU, flash memory, SRAM, ADC, filters, amplifiers, LED intensity control circuits, serial interfaces and internal oscillator.PPG is a non-invasive technique which is especially suitable for wearable devices. With Weltrend’s state-of-the-art automatic motion artifact removal algorithm, WTHRM121 could be used on smart watches, sport watches or bracelets to continuously detect, measure, calculate and display heart rate during walking, running… etc.

Features

- Supply Voltage Range:
-4.75V ~ 5.25V @ USB Interface or

-3.3V @ DVDD, AVDD, VDDADC
- Supply Voltage Sources
-Digital circuits: DVDD

-Analog-to-Digital Converter (ADC): DDADC

-Analog Circuits: AVDD
- Transmit Path
-Programmable LED duty control

-Automatic LED intensity control
- Receive Path
-Integrated band pass filters, low noise amplifiers and ADC

-Integrated motion artifact removal algorithm
- UART/IIC Interfaces: Heart rate data output
- Power Management: Power-on Reset/Brown-Out Reset (POR/BOR)
- Package: QFN64 (7.5mm x 7.5mm x 0.75mm)

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