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BQ76920初始化问题,打开库仑计,SYS_STAT的OVRD_ALERT位为1

Other Parts Discussed in Thread: BQ76920

BQ76920上电,初始化,打开库仑计使SYS_CTRL2的CC_EN设为1,SYS_STAT的OVRD_ALERT位为1,且读到SYS_CTRL2的CC_EN不为1,这时MCU重新复位,重新初始化BQ芯片才能正常打开BQ的库仑计。

  • OVRD_ALERT bit is being set due to fact there is some residual voltage on the ALERT Pin. 2.5V voltage on ALERT is a solid logic high. ALERT pin response could be due to a spurious glitch coupling onto the ALERT pin.

    change out the 1Mohm to ~500K to GND. Also add a 470pF cap to GND.

    make certain, the SYS_CTRL registers are cleared. to CLEAR write "1" in the corresponding register.

    hope this helps out.