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BQ25790EVM: Can the IC automatic terminate discharge of battery when the battery is low ?

Cedrick
Expert 8270 points
Part Number: BQ25790EVM

Hi,

Good day.

Our customer is evaluating the BQ25790EVM and they have the following question.

""I am currently doing some evaluation on the chip and wanted to ask can the chip automatically terminate discharge or shutdown when the battery is low :

case if a 4 cell battery (16.8Vmax) is attached to the IC charger and the safe lowest discharge voltage for the 4 cell is 12 V. will the IC charger shutdown automatically at 12V or do I need a microcontroller to use the I2C to manually shut it down?""

Looking forward to your inputs. Thank you.


Regards,

Cedrick

  • 0
    TI__Mastermind 40655 points

    Dear Cedrick,

    There is no undervoltage protection directly, however there is a solution to your problem. If you use the ShipFET you can put it into Ship Mode by writing to SDRV_CTRL when the battery voltage gets too low. You could measure the battery voltage using the ADC or external ADC. Putting the ShipFET in Ship Mode disables the Ship FET and the BATFET but still allows I2C. Adapter plug in, pulling /QON low, or writing to SDRV_CTRL again will turn the ShipFET on again. Please keep in mind the Ship Mode is for Battery Only Condition.

    Thanks,

    Mike Emanuel

    Please click "Resolved" if this answers your question.