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BQ25890: the SYS pin output cannot be recovered after a short-circuit

Robin Zhou
Intellectual 625 points
Part Number: BQ25890

TI engineers,

The BQ25890 encounters an abnormal phenomenon: under the battery power supply condition, if the SYS pin output of the BQ25890 is short-circuited to the ground, the SYS output of the BQ25890 will be protected, and the output is 0v, but the short-circuit abnormality is removed, and the SYS pin output cannot be recovered. Only insert the charge or /QON pin has a low-level pulse, you can recover, trouble to confirm whether there is any other way sys pin can automatically restore the output?

Thank you
Robin

  • 0
    TI__Guru**** 165886 points

    Hi Robin,

    From datasheet section

    9.2.10.2 BATFET Enable (Exit Shipping Mode)

    When the BATFET is disabled (in shipping mode) and indicated by setting BATFET_DIS, one of the following

    events can enable BATFET to restore system power:

    1. Plug in adapter

    2. Clear BATFET_DIS bit

    3. Set REG_RST bit to reset all registers including BATFET_DIS bit to default (0)

    4. A logic high to low transition on QON pin with tSHIPMODE deglitch time to enable BATFET to exit shipping

    mode

    I assume that SYS is powering the host so no I2C comms are available?  Can a diode from BAT to SYS be added so that SYS is still powered from the battery after a short?

    Regards,

    Jeff