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BQ25890, 断掉电池,系统无法正常启动

Other Parts Discussed in Thread: BQ25890, BQ25892

各位工程师,你们好~

现在在测试BQ25890芯片,有一个问题。我直接接适配器, 没接电池 系统无法正常启动。

这是开机阶段的寄存器信息,请参考~ 

[18:45:49]==eric== reg 0 value 62
[18:45:49]==eric== reg 1 value 6
[18:45:49]==eric== reg 2 value cd
[18:45:49]==eric== reg 3 value 10
[18:45:49]==eric== reg 4 value 2f
[18:45:49]==eric== reg 5 value 13
[18:45:49]==eric== reg 6 value 5e
[18:45:49]==eric== reg 7 value 82
[18:45:49]==eric== reg 8 value 4b
[18:45:49]==eric== reg 9 value 0
[18:45:49]==eric== reg a value 76
[18:45:49]==eric== reg b value be
[18:45:49]==eric== reg c value 0
[18:45:49]==eric== reg d value 13
[18:45:49]==eric== reg e value 5b
[18:45:49]==eric== reg f value 5c
[18:45:49]==eric== reg 10 value 39
[18:45:49]==eric== reg 11 value 98
[18:45:49]==eric== reg 12 value 0
[18:45:49]==eric== reg 13 value 22
[18:45:49]==eric== reg 14 value 1d

希望收到回复,谢谢!

  • 别的情况都没有问题,只有在没接电池时有问题吗?
  • 我也遇到过这样的问题,请各位帮帮忙:

    BQ25890 文档中描述可以通过USB输入来启动芯片的,

    9.2.3 Device Power Up from Input Source
    When an input source is plugged in, the device checks the input source voltage to turn on REGN LDO and all the
    bias circuits. It detects and sets the input current limit before the buck converter is started when
    AUTO_DPDM_EN bit is set. The power up sequence from input source is as listed:
    1. Power Up REGN LDO
    2. Poor Source Qualification
    3. Input Source Type Detection based on D+/D- (bq25890) or PSEL (bq25892) to set default Input Current Limit
    (IINLIM) register and input source type
    4. Input Voltage Limit Threshold Setting (VINDPM threshold)
    5. Converter Power-up

    现在发现没有电池的情况下,接入电源,系统总是在kernel阶段重启。

    读取出来的输入类型一直是REG0B _VBUS_STAT [101] unknown adapter 。

    单独接上电池不外接VBUS是可以正常启动运行的,唯独脱离电池不能开机启动