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BQ40Z60EVM-578: bq40z60 not charging [ACFET] = 1 & [DSG] = 1 & [CHGSTAT] = 0 always

Raakesh kamal
Prodigy 20 points
Part Number: BQ40Z60EVM-578
Other Parts Discussed in Thread: BQ40Z60

I have been trying to charge 2 Li-ion cells with nominal voltage of 3.7v with bq40z60 evm board with no results.

[ACFET] is always 1

[DSG] is always 1

[CHGSTAT] is always 1

[MaxError] is always 100%

I have all the FETs enabled and also the CHGR enable.

Please help.

  • 0
    TI__Guru* 76230 points
    hi Rakesh
    No you do not have the fets enabled. Your xdsg flag is set meaning your discharge fet is turned off and you have a CUV condition. Looking at your cell voltages, your cells are highly unbalanced. One is 2736mV and the other is 3649mV. Did you configure the gauge for the correct number of cells?
    Are you following the instructions in the EVM user manual?

    thanks
    Onyx
  • 0 in reply to Onyx Ahiakwo
    Prodigy 20 points

    Hello,

    Thanks for your quick reply.I followed all instructions from the user manual.I was trying to check the power path management with the load and charger connected .It drew the current from the battery cells continuously till CUV was reached, while drawing zero current from the charger then XDSG was set and DSG was stopped.Through the whole process ACFET was set and CHGR_EN was set.Cell balancing also was enabled so I don’t understand how the cells got unbalanced.

  • 0 in reply to Raakesh kamal
    TI__Guru* 76230 points

    Cell balancing does not work during discharge. It only works during charge and rest. What did you set  charging current to. Note that if you have a load connected, if the load draw if greater than the charger current, the battery will not charge but rather  the load  will get the entire current and the cells will provide supplemental current for the load if the charger is unable to provide the needed current needed by the load.

    Did you configure your gauge for the correct no of cells? how many cells in series are you using? Did you configure your charging voltage correctly as per the app note below:

    http://www.ti.com/lit/an/slua750/slua750.pdf

    thanks

    Onyx