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Original question:

BQ27427: When initializing the bq27427, where are delays required?

BQ27427: Implementing fuel gauge on STM32, anyone have sample driver C code?

Steven Minnick
Prodigy 20 points
Part Number: BQ27427

Tool/software:

Looking to implement this BQ27427 on an STM32 based system, anyone have driver C code as a nice basis to start?  Not that I can't write it all myself and figure it out, but why re-invent the wheel if someone has stuff who's willing to share.  Thanks!

  • 0
    TI__Mastermind 24741 points

    Hello Steven, 

    I believe this is the closest thing we have to what you are looking for. Please see this link for Linux Driver for BQ27XXX devices. 

    Regards, 

    Jonny. 

  • 0 in reply to Jonny
    Prodigy 20 points

    Jonny,

    Thank you.  That did help me get started.  I appreciate it.

    I have the EVM dev board and I've got a 620mAh battery connected to it.  And it's responding.  And I was following the technical reference manual for the BQ27427 (I believe) and I was having some issues.

    Success: I did have it read the Device Firmware, the document says 0x0202 and thats what I read out of it.  I get temperature, battery voltage and current all correctly reporting. 

    Fail: when I read the Device ID I get 0x6C08 which seems wrong.  And there is no state of charge.  All the states of charge are all 0's. 

    Any ideas what I could try?

    Steve

  • 0 in reply to Steven Minnick
    TI__Mastermind 24741 points

    Hello Steve, 

    Before referring to the SOC reported by the gauge, you should configure the gauge for your application. Additionally, how are you trying to read the SOC? 

    Regards, 

    Jonny. 

  • +1 in reply to Jonny
    Prodigy 20 points

    Jonny,

    Thanks for replying.  I agree I need to configure the gauge for my application.  I might have not done that properly.  But it was weird the device ID was always reporting 0x6c08.  I figured out how to do a hard reset of the device and that was what solved it. 

    I did 2 control unseals in a row, then CFG Update, waited for the CFGUPMODE flag to get set.  Then did a hard reset, waited for that flag to clear.  Then did a control seal. 

    After that the device ID was reporting correctly and the SOC was what I expected based on defaults in the datasheet. 

    Prior to this, reading any of the capacity registers they were all 0, which I was surprised with.  FW version was good, batt voltage was good, but device ID was not and all the capacities were 0.  Did a hard reset (as described above) and it was fine.  Not sure what made it mad, or put it in that mode, but I think I have it working well now.

    Steve

  • 0 in reply to Steven Minnick
    TI__Mastermind 24741 points

    Hello Steven, 

    Thank you for the update here. Please let us know if you have any more questions. 

    Regards, 

    Jonny.