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BQ20Z655上电启动问题

Other Parts Discussed in Thread: BQSTUDIO

你好:

       我用BQ20Z655芯片设计了一个2并2串的电池组,现在遇到一个问题就是,焊接好后,上电启动之后,BQ20Z655芯片的REG25引脚输出2.5V,REG33引脚输出3.3V,这说明芯片唤醒成功了,但是大约1分钟之后,这两个引脚就没有输出了,这是什么原因导致的?