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AFE提早发生OCD/SCD保护

Other Parts Discussed in Thread: BQ76930

我们是使用TUI BQ76930 AFE
OCD和SCD的保护threshold分别设为100mV及200mV

我们直接在SRN-SRP上使用power supply去让它产生压差

但发现当
SRN-SRP的压差为86mV时, 就发生AFE OCD保护, OCD bit被设为1
SRN-SRP的压差为154mV时, 就发生AFE SCD保护, SCD bit被设为1

请问一下AFE为什么会提早发生保护的动作?

Thanks