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BQ40Z60: Why Precharge don't start automaticaly

gilles MICHEL40
Intellectual 410 points
Part Number: BQ40Z60

Hi,

Sometimes, the battery is discharged under 2800mV per cell.

So I expect that PreCharge FET takes control of the Precharge cycle automatically BUT it's not the case.

If I do it manually (FET off then DECHG FET on and FET on), it works correctly.

Config 4cell GLimg.gg.csv

How can i get an automatic function for that ?

Regards

Gilles

enclosed : our config file

  • 0
    TI__Mastermind 42535 points

    Hi Gilles,

    The gauge enters PRECHARGE mode if,
    1. Min cell voltage1..4 < Precharge Start Voltage, OR
    2. Max cell voltage1..4 < Charging Voltage Low – Charging Voltage Hysteresis and not in CHARGE mode


    An external precharge FET or CHG FET can be used in PRECHARGE mode. Setting the Precharge Start Voltage and Charging Voltage Low = 0 mV disables the precharge function.