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BQ40Z60 CHG and DSG issue on custom hardware

wilfrid
Prodigy 220 points
Other Parts Discussed in Thread: BQSTUDIO

Hello all,

My post is similar to this previous one:

http://e2e.ti.com/support/power_management/battery_management/f/180/p/432919/1559224#pi317195=2

I'm developing a custom hardware based on the reference design of TI, but I communicate with the gauge only through EV2300 and BQStudio as I do not have a µC on my board for the moment.

I can't activate the DSG or CHG FET in any situation with firmware, even manually and the ACFET and buck regulator are active only when I disconnect my battery pack.I try packs with different levels of charge.

I thought at one time to have a problem with my board as the DSG and CHG off signal float a few volt below the source of FET (for example 6V for the CHG FET with Vbat at 13.5V) whereas the datasheet gives a drive value around 0V but I have the same behavior with ACFET which is, a least, partially functional.

All the bit which are not on screen are zero except ITEN.

My design .srec file,it's the original firmware, I just change the DA configuration accordingly with my battery (4S pack and NR = 1), I try to change also the SOC Flag configuration as the SoC was poorly evaluated.

/cfs-file/__key/communityserver-discussions-components-files/196/7245.firmware-BQ40Z60-test.zip

Thank you for your help :)

Best regards,

Wilfrid

  • 0
    TI__Guru 73830 points
    Wilfred
    The FUSE flag is set in the Operation Status register. Do you have the AFEFUSE pin connected to VSS, if it is unused? It will cause the FUSE flag to set and the FETs to turn off, if it is left floating.
    Tom
  • 0 in reply to ThomasCosby
    Prodigy 220 points

    Thanks a lot!!!

    All seems to be perfect now :)

    The fuse circuitry was designed on my board, but I had not soldered the components yet.

    The datasheet is a little bit confusing, the AFEFUSE output is not only an output with this disconnection detection.

    Best regards,

    Wilfrid