GH3220T Block Diagram
Typical application for smart watches/wristbands

GH3220T is an ultra-low-power and ultra-high-precision heart rate sensor that integrates multi-channel PPG, single-lead ECG, and dual-channel temperature sensing circuits. It monitors health indicators such as heart rate (HR), heart rate variability (HRV), peripheral capillary oxygen saturation (SpO2), and pulse wave translation time (PWTT), and body & skin temperature. GH3220T is ideal for high-end smart watches, smart wristbands, ECG patches, professional sports gear, and medical devices.

GH3220T Block Diagram
Typical application for smart watches/wristbands

Key Features

  • Ultra-Low Power Consumption

    • Average current consumption in heart rate detection mode: 59 µA

    • Average current consumption in SpO2 detection mode: 230 µA

  • Ultra-high Performance

    • 24-bit highly accurate ADC

    • PPG dynamic range: up to 110 dB

    • Up to 256 µA configurable Background Light Cancellation (BGC)

    • Up to 256 µA configurable DC offset cancellation

    • AC Background Light Rejection (BGR) (50 Hz): 60 dB

    • DC Background Light Rejection (BGR): 80 dB

    • ECG Common-Mode Rejection Ratio (CMRR): 100 dB

    • ECG input impedance > 2 GΩ,support dry electrode

    • Input noise meet YY-0885/IEC60601-2-4

  • Temperature Sensing Module

    • 2 NTC temperature sampling channels and 1 ref resistance sampling channel

    • Temperature sensing range and deviation: 25 °C ≤ Temp. < 45 °C: ±0.1 °C

  • Light Transmitter Block

    • Two built-in LED drivers: each supports 4 LEDs, total 8 LEDs

    • Each LED driver with 8-bit resolution and a maximum drive current of 200 mA

    • Supports 8 LEDs concurrently for SpO2 or multi-wavelength and multi-position heart rate detection

  • Light Receiver Block

    • Four AFEs that support synchronous sampling (when the temperature sensing channels are not in use)

    • Up to 8 programmable sample time-slots; up to 32 effective channels for data acquisition

    • 2 PDs in differential connection or 4 PDs in single-ended connection

  • Build-in Functions

    • Automatic dimming

    • Automatic wrist (wearing) detection

    • Right leg drive (RLD) single-lead ECG sensing circuit

  • Internal FIFO

    • 800 * 4 bytes, caching 800 samples

  • Communication Interface

    • SPI: up to 12 MHz

    • IIC: up to 1 MHz

  • Critical Electrical Characteristics

    • AVDD: 2.0 V – 3.6 V

    • VDDIO: 1.62 V – 3.6 V

    • Operating temperature: -30 °C – 85 °C

  • Package

    • WLCSP Package

    • Size: 2.605 mm * 2.905 mm * 0.468 mm, 0.4 mm pitch, 42 balls

  • Typical Applications Supported

    • Heart Rate

    • SpO2

    • ECG

    • PWTT

    • HRV

    • Wearing detection

    • Temperature measurement

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Product Details

Part Number



LED interface


Max LED Driving Current

200 mA * 2


AFE channels


PD interface

5 Single/2 Diff


110 dB


ECG channels


Input Impedance

2 GΩ

RTI noise

1.36 µVrms

Power Consumption

590 µA@500SPS


NTC interface


Temperature measurement accuracy

±0.1°C@25°C~ 45°C






3.2k bytes

Package Type


Chip Size(mm)

2.6 * 2.9 * 0.46


HR, SpO2, HRV, ECG, Wear Detect

Hardware Resources

GH3x2x EVK

Used for the hardware verification and performance test for GH3020/GH3026/GH3220

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Used for the module test and completed product test for all the health sensors

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Software & Tools

GH3x2x EVK PC Tool

This tool can be used to evaluate the performance of GH3x2x chip and generate the configuration of driver library
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GH3x2x Algorithm Library

This algorithm library integrates the algorithm library of GH3x2x, including the measurement algorithm of basic physiological indicators (such as heart rate and blood oxygen)
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GH3x2x Driver Library

The driver library integrates the driver code and library functions of GH3x2x to help customers develop drivers and algorithms quickly
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GH3x2x Android APP Tool

This tool can be used for the optical path test and health function data collection of the whole machine
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Name Rights Description Version Date
GH3220T_Datasheet Register Users Only Rev.1.3 2022-01-06
GHealth_User_Manual Nda Users Only Rev.1.2 2021-08-17
GH(M)3x2x EVK Hardware User Guide Nda Users Only Rev.1.0 2020-08-04
GH3220T_Schematic_BOM Nda Users Only Rev.1.1 2023-07-13
GH3220T_Schematic Register Users Only Rev.1.1 2022-02-14
GH3220T(2.905X2.605X0.468)_POD Nda Users Only Rev.1.0 2021-12-29
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