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BQ25504EVM-674: Changing UV and OV of BQ25504EVM

BEZAK
Intellectual 465 points

Part Number: BQ25504EVM-674

Hi,

I have a BQ25504EVM. I needed UV=2.9V , OV=3.3V , OK_HYST=2.9 , OK=3.0V, how can I achieve this?

I need this configuration because I only want the VSTORE and BAT-OK to turn on the microcontroller if the voltage is above 2.9V otherwise it should be zero.

Thanks,

Bee

  • 0
    TI__Intellectual 1640 points
    Hello,
    These values are programmable through different resistors.
    VBAT_UV = VBIAS *[1+ (Ruv2/Ruv1)]

    VBAT_OV= 1.5*VBIAS *[1+ (Rov2/Rov1)]

    VBAT_OK_HYST= VBIAS *[1+ (Rok2+Rok3/Rok1)]

    VBAT_OK_PROG= VBIAS *[1+ (Rok2/Rok1)]

    There's an EVM schematic on the page 15 of EVM user guide.
    You'll have to change the default resistors on EVM to the desired resistors you want for your different voltage thresholds.