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TPS65721: TPS65721 disable charger

Lucian Darie
Prodigy 150 points
Part Number: TPS65721

Hello,

We need to keep battery charger always disabled on TPS65721.

What is the best way to do this ? The battery is always connected

and the PMIC must work as normally (with AC adapter, etc) but never try to charge the batt.

Thank you

  • 0
    TI__Genius 9655 points
    Hi Lucien,
    I did not see an obvious way to disable the charger and I understand reducing the charge-current (using ISET) is not good enough, correct?
    I referred your request to the expert, but he's out of office today, so please expect some delay.
    Best regards,
    Frank
  • 0 in reply to Frank Dehmelt
    Prodigy 150 points

    Hello Frank,

    I put a 680k resistor (instead NTC 10k) on TS pin to simulate TOO COLD condition so the charger would theoretically not work.

    I also see  CHGCONFIG0 reg, 02h , Bit 0 CH_EN = 0

    0 = the charger is disabled
    1 = the charger is enabled

    but I am not sure if that bit CH_EN  is set automatically by charger or I can set it myself via I2C to permanently disable the charger.

    Thank you

  • 0 in reply to Lucian Darie
    TI__Genius 9380 points
    Lucian,
    You are correct, the CH_EN bit will disable the charger. The default is on = 1, you will have to set this bit through I2C. There are no pins associated with disabling the charger.

    It's not a good idea use a 680k resistor to trick the TS input. Many things will happen when the IC thinks it's cold, including restricting you from using the battery if it thinks it's to cold. The intent is to protect the battery, so providing current from the battery could be limited. I typically use a 10k resistor if I am not planning on using the TS function.
  • 0 in reply to Gordon Varney
    Prodigy 150 points
    Thank you Gordon. Really helps.

    Regards,
    Lucian