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GH3311
GH3311

GH3311 is an ultra-low-power, ultra-high-precision and multi-modal analog front end, capable of PPG, Bio-Z (BIA, IPG and EDA) measurement. The flexible operating mode enabling the AFE to accommodate various sensors measurements including temperature sensors. It is applicable to the smart devices like high-end smart watches and wristbands.

GH3311

Key Features

  • PPG signal chain

    • 4 independent PPG channels with simultaneous sampling to allow less LED on-time

    • Support 4 differential or 8 single-ended PD inputs multiplexing to PPG channels

    • 4 high-resolution 24-bit ADCs for simultaneous conversion

    • Ultra low dark current noise of <14 pArms

    • 4 LED drivers support up to 16 LEDs, 200 mA peak drive current for each driver

    • High system SNR of >110 dB to ensure accurate PPG monitoring

    • Up to 128 samples per cycle, over 80 dB ambient light rejection ratio

  • Impedance measurement signal chains

    • Programmable BIA TX built-in current excitation source with frequency up to 1 MHz

    • Ultra-low noise INA with high pass filter

    • 4-electrode impedance measurement for portable BIA and support contact impedance measurement

    • Built-in Analog I/Q demodulator provide complex (I, Q) impedance data

    • EDA channel reuse DC mode /AC mode ECG channel with additional current excitation source (EDA TX) of low frequency excitation

    • Support digital I/Q demodulation for complex (I, Q) impedance data extraction

    • Support on-chip CORDIC

  • Build-in functions

    • Automatic LED dimming and AGC (automatic gain control)

    • Active shielding driver

  • Support SPI and IIC communications

  • Package

    • WLCSP 49 balls,0.35 mm pitch

    • 2.645 mm * 2.645 mm * 0.5 mm

  • Internal FIFO

    • Area 1: 16 k bytes (3200 samples)

    • Area 2: 80 k bytes (16k samples)

  • Typical Applications

    • Consumer electronics: wearable devices

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Product Details

Part Number

GH3311

PPG TX

LED interface

16

Max LED Driving Current

200 mA * 4

PPG RX

AFE channels

4

PD interface

8 Single/ 4 Diff

Max SNR

110 dB

Bio-Z

BIA channels

1

EDA Channels

1

BIA measurement accuracy

Magnitude:±0.1%
Phase angle:±0.1°

EDA resolution

>90 dB

Temperature

NTC interface

4

Temperature measurement accuracy

±0.1 °C@25 °C~ 45 °C

Interface

IIC/SPI

ADC

24-bit

FIFO

96k bytes

Package Type

WLCSP-49

Chip Size (mm)

2.645 * 2.645 * 0.5

Algorithm

HR, SpO2, HRV, BIA, Wear Detect

Hardware Resources

GH33xx EVK

An evaluate kit based on GH3300/GH3310/GH3311/GH3030 which is designed for hardware verify and performance test.

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Software & Tools

GH33xx EVK PC Tool

This tool can be used to evaluate the performance of GH33xx chip and generate the configuration of driver library.
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GH33xx Algorithm Library

This algorithm library integrates the algorithm library of GH33xx, including the measurement algorithm of basic physiological indicators (such as heart rate, HRV, SpO2, ECG, and Bio-Z).
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GH33xx Android APP Tool

This tool can be used for the data collection and performance test of Goodix Demo watch.
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