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Original question:

BQ25710: VIN discharge slow after removing adapter, ACOK drops delay cause charging indicator reaction slow

BQ25720: Power up process

Far Hung
Expert 7680 points

Part Number: BQ25720
Other Parts Discussed in Thread: TIGER, BQ25710,

Hi Tiger,

I found the E2E thread as below, you mention the power up process may take 200ms, any write during this time may be lost. The delay 200ms is base on CHEG_OK assert or VBUS?

https://e2e.ti.com/support/power-management-group/power-management/f/power-management-forum/1264347/bq25710-vin-discharge-slow-after-removing-adapter-acok-drops-delay-cause-charging-indicator-reaction-slow

Cheers,

Far

  • 0
    TI__Expert 3335 points

    Hi Far,

    The delay is based on VBUS or VBAT under voltage and the time it takes to initialize all the circuits. For BQ25720, when VBUS exceeds VBUS_UVLOZ or VBAT exceeds VBAT_UVLOZ a power on reset is executed. 5 ms after either VBUS or VBAT becomes valid, the charger resets all the registers to the default state. Another 5 ms later, the user registers become accessible to the host. For BQ25710 the delay is 200ms.

    Best Regards,

    Munir