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BQ2057C: 长时间充电,充电状态没有低电平信号

Part Number: BQ2057C

BQ2057C 芯片使用在气体传感器仪器,充电电压5.6V, 单节锂电池。

问题:电池充满4.2V, 芯片第三引脚STAT电平没有变成低电平。失效率 26/2800,不良率在0.9%左右。更换芯片可解决此问题。 

请帮忙分析下原因和改进措施。  

充电路如下: