GH3020 Block Diagram
Typical application for smart watches/wristbands

GH3020 is an ultra-low-power and ultra-high-precision heart rate sensor that integrates multichannel PPG sensing circuits. It monitors health indicators such as heart rate (HR), heart rate variability (HRV), and peripheral capillary oxygen saturation (SpO2). GH3020 is ideal for high-end smart watches, smart wristbands, professional sports gear, and medical devices.

GH3020 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)

    • AC background light rejection (BGR) (50 Hz): 60 dB

    • DC background light rejection (BGR): 80 dB

  • Light Transmitter Block

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

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

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

    • Up to 8 programmable lighting time-slots

    • PSRR: 95dB

  • Light Receiver Block

    • 4 independent AFEs that support synchronous sampling, 75% reduction in LED lighting time in multi-channel applications

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

    • 4 PD interfaces for diff mode, and 8 PD interfaces for single-end mode

  • Build-in Functions

    • Automatic dimming

    • Automatic wrist (wearing) detection

  • Internal FIFO

    • 800 * 4 bytes, caching 800 samples

  • Communication Interface

    • SPI: up to 12 MHz

    • IIC: up to 1 MHz

  • Package

    • WLCSP Package

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

  • Typical Applications

    • Heart Rate

    • SpO2

    • HRV

    • Wrist (Wearing) Detection

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Product Details




External LED interface


Max LED current

200 mA / 400 mA


AFE channel


External PD input

8 single or 4 diff


110 dB

HR supply current (µA)


SPO2 supply current (µA)





800 samples


24 bit

Size (mm)

2.6 * 2.9 * 0.5



Typical application

Smart wristbands/watches, professional sports equipment, medical device


HR, HRV, SpO2, 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 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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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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Name Rights Description Version Date
GH3020_Datasheet Register users only V1.4 2021-07-23
GH3020_Schematic Register users only V1.3 2021-01-07
GH(M)3x2x Mass Production Test Tool User Guide Secure files,Please Contact Sales V1.2 2022-07-16
Introduction to GH(M)3x2x Mass Production Test Plan Secure files,Please Contact Sales V1.1 2022-07-16
GHealth_User_Manual Secure files,Please Contact Sales V1.3 2022-07-16
GH(M)3x2x EVK Hardware User Guide Secure files,Please Contact Sales V1.0 2022-07-16
GH3020_Schematic_BOM Secure files,Please Contact Sales V1.3 2022-07-16
GH3020(2.905X2.605X0.468)_POD Secure files,Please Contact Sales V1.0 2022-07-16
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