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BQ25622: VSYSMIN

G Cant
Intellectual 335 points
Part Number: BQ25622


There is a configurable parameter known as VSYSMIN.

What exactly does this parameter? Is a minimum voltage that triggers an error message or Interrupt signal?

In the Datasheet there is the following statement: "The minimum system voltage is set by VSYSMIN register setting. Even with a fully depleted battery, the system is regulated to the minimum system voltage".

I have configured VSYSMIN to 3.5V. When a 3.3V battery is used, VSYS = 3.3V, similar to VBAT. Shouldn't always be 3.5V regardless of battery voltage?

Please clarify.

Thank you very much for your help.

  • 0
    TI__Mastermind 32250 points

    Hello, 

    The VSYSMIN parameter will be the minimum allowable system voltage during charging. For example, if battery is charging at 3V and VSYSMIN = 3.5V then VSYS will be regulated at 3.5V while VBAT = 3V. 

    If there is no input supply connected at VBUS and only the battery is connected VSYS will be approximately equal to VBAT. 

    Best Regards,

    Garrett