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BQ77908A Is there a status/error code register?

Craig McConnell
Prodigy 20 points
Other Parts Discussed in Thread: BQ77908A

Problem:

The chip keeps reverting into the shutdown mode, but I have checked for all of the faults modes (OV, UV, OCD, SCD, SCC, OT, etc.) and do not see anything wrong.  I would like to be able to read out  an error code of some kind to tell me what is causing shutdown mode.

Background:

I have been working on a project that can be powered by a 4-cell LiPo battery pack or by an 18V wall adapter, and will recharge the battery when both are connected.  I am using the BQ77908A to protect the battery, and I am using the  "4- to 8-Series Cell Configuration" on p. 37 of the datasheet.

Any help would be much appreciated :)

  • 0
    TI__Guru 54715 points
    Yes, registers 0x0C and0x0D. See http://e2e.ti.com/support/power_management/battery_management/w/design_notes/1409.aspx But status is not remembered after a shutdown, so if it is turning off you will need to hold CHGST high to see the status. Open wire, shorted thermistor or under voltage are things to check. Wrong cell count configuration could give open wire or under voltage.
  • 0 in reply to WM5295
    Prodigy 20 points

    Wonderful, thank you!

    I'm going to check those registers out right now.

    EDIT: It worked beautifully.  Thank you so much!!