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BQ25713: What is the VSYS voltage when power up from dc source and battery removed?

Jeff Chen71
Expert 1345 points
Part Number: BQ25713
Other Parts Discussed in Thread: PMP40441, TPS65251,

Hi ,

    Customer want to implement USB PD like reference design PMP40441. Below is the block diagram. The MCU power is from TPS65251 .

They want to ask when adapter plug in and battery be removed or battery depletion whether or not the VSYS have output voltage

,they are worry about if the VSYS do not output voltage the mcu can't be  power up to config bq25713 and tus422. 

The CELL_BATPRESZ Iis config to 3 cell. If VSYS can output voltage on VSYS without any config. what voltage will be expect on VSYS. 

Thanks

  • 0
    TI__Expert 3320 points

    Hi Jeff:
       

         Yes, the VSYS will be set up when Adaptor plug in to make sure the host can communicate. The voltage level is our minimum system voltage which varies with different CELL_BATPRESZ pin setting shown below.

         1S: 3.58V

         2S:6.14V

         3S:9.22V

         4S:12.29V

    Regards

    Shishuo