Weltrend

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WTHRM122

【 General Description 】

WTHRM122 is a heart rate monitoring MCU, using PPG (Photoplethysmographic) technology, for the application 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 technologies/devices. With Weltrend’s state-of-the-art automatic motion artifact removal algorithm, WTHRM122 could be used on wearable devices such as smartwatch, sport watch, or bracelet to continuously detect, measure, calculate and display heart rate during exercise, walking, running, and etc.

【 Features 】
●	Supply Voltage Range: 3.3V @ VDDPST, AVDD, VDDADC
●	Supply Voltage Sources:
	-Digital circuits: VDDPST
	-Analog-to-Digital Converter (ADC): VDDADC
	-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
●	IIC/UART Interface: Heart rate data output
●	Power Management: Power-on Reset/Brown-Out Reset (POR/BOR)
●	Package: QFN32 (4 mm x 4 mm x 0.75 mm)

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