Black line: connected with power ground (bond strap).

黑线：接电源(搭铁)。

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GND: This pin is the combined control circuitry and power ground.

该引脚是综合控制电路和电源地。

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The analog circuit consists of power-supply modular, signal pickup circuit, analog filter amplifier, gain control circuit, power ground lifting circuit and signal limit circuit of A/D channel.

模拟电路部分包括：电池电源供电模块、信号采集电路、模拟滤波和放大电路、增益调节电路、地电压抬升电路和A/D输入信号限制电路。

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