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BQ40z60EVM cell and FET voltage -273deg

Valeria Denisova
Prodigy 45 points

hi,

i have bq40z60EVM evaluation board. I want to charge and discharge to battery cell 2S manually. I did all steps correct by i see that the temperature of the cell is -273 deg. I think that this doesn't abbey the evaluation board to charge and discharge the battery cells. Can you please help me to solve this issue.

Best regards,

Valeriareg_state.rar

  • 0
    TI__Guru 73830 points
    Valeria
    You have all of the temperature sensors disabled and none are assigned to measure the cell temperature. Try setting

    Temperature Enable = 01
    Temperature Mode = 00

    This will select the internal temp sensor to measure the cell temperature. You can enable the external thermistors after you get this to work.
    Tom
  • 0 in reply to ThomasCosby
    Prodigy 45 points
    Dear Thomas,
    Thank you for the fast answer. I set the Temperature Enable to 01 and Temperature Mode to 00 but still the fet temp is -273deg. But the charging process now start and thats ok for me.
    I have just one more question. I cant charge the batteries higher the 4000V but i need to charge it to 4200V. Also i cant start automatic charge discharge cycle is it possible?

    Best regards,
    Valeria
  • 0 in reply to Valeria Denisova
    TI__Mastermind 34705 points

    Hi Valeria,

    Are you using bq40z60EVM? What resistor divider ratio you're using from VSYS to Vfb? The max charger output voltage is 1.22V/(Vfb divider ratio from VSYS). The min charger output voltage is 0.61V/(Vfb divider ratio from VSYS).