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BQ25895: VBUS_GD, PG_STAT, VBUS_STAT registers

Howard Zou
Genius 12365 points
Part Number: BQ25895
Other Parts Discussed in Thread: BQ24610

Hi,

I wonder what's the sequence when these registers are changed when I plug an adaptor.

What I know from the datasheet is:

1. when pass the "Poor Source Qualification" VBUS_GD will be set.

2. and then when "Input Source Type Detection" is done, PG_STAT is set. 

Is VBUS_GD is always set before PG_STAT bit is set?

Is VBUS_STAT changed simultaneously with PG_STAT?

Then should I use VBUS_GD bit or PG_STAT to determine if adaptor is inserted?

Is it possible that VBUS_GD is 1, but VBUS_STAT is 000?

  • 0
    TI__Guru 57961 points
    Howard,

    VBUS_GD bit is always set the first, then VBUS_STAT & PG_STAT bits are updated.

    It depends. VBUS_GD means a valid power source is present while PG_STAT means VBUS power is ready for the charger to operate.

    It is highly recommended to get familiar with the BQ25895 charger operation by testing the BQ24610 EVM (www.ti.com/.../bq25895evm-664).

    Thanks,

    Ning.
    Please click "This Resolved my issue" button if this post answer your question.