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BQ25890: 路径管理在什么情况 会只选择 输入源 input source (VBUS), 而不消耗电池电能？

fibo lu
Prodigy 10 points

Part Number: BQ25890

在datasheet 下 中提到  “The device provides automatic power path selection to supply the system (SYS) from input source (VBUS), battery (BAT), or
both.”  这一个自动是什么条件只选择 input source 呢？        目前我们只测试到 enable ship mode  可以不消耗电池电能，  有其它方式可以配制吗？ 

  • 0
    TI__Guru*** 130456 points

    您好，

    1) REG03[4] 'CHG_CONFIG' set to 0 will stop battery charging and result in VBUS power supply only on VSYS. Please be aware with charge disabled the battery is still allowed to discharge to SYS for the case where SYS load requires more current than VBUS input can supply. 

    2)REG09[5] 'BATFET_DIS' set to 1 will also result in VBUS power supply only on VSYS. It is okay to set this bit to 1 with VBUS already plugged in; it will force BATFET turn off. With 'BATFET_DIS' set to 1 battery will not discharge to support SYS. The device will not be able to enter supplement mode. Additionally, please be aware that if 'BATFET_DIS' is set to 1 before VBUS is connected the input plug in event will exit ship mode and reset BATFET_DIS = 0. 

    To summarize either option 1 or 2 is acceptable to set BQ25890 to only power VSYS. You will need to decide if you want to allow battery to discharge. If ability to discharge is desired then option 1) should be used. 

  • 0
    Prodigy 10 points

    多谢， 我们这边安排按第一个方案， 进行验证。