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bq20z65evm first run problems

Frank Thomas
Prodigy 195 points
Other Parts Discussed in Thread: BQ20Z65

Hallo,

I just got my bq20z65EVM board for evaluation. What I first did was that I connected a charged LiPo battery (2 outputs: +/-) to the 1N und 2P (and shorted the other 2P..4P) to pick off the respective voltage (8.2V)  at the pack+/pack- connector but it didn't worked. So what did I wrong or do I have to unlock first the board/chip?

thank you, ft

  • 0
    TI__Intellectual 930 points

    Make sure that you jumpstarted the board. This is done by connecting the highest cell to pack+. The minimum voltage required to jumpstart is 6V so double check that your pack is at least 6V.

    If that doesn't work, I would recommend trying a resistor divider and power supply instead of a battery pack to jumpstart the part.

    If the part still doesn't respond, try using this checklist to make sure that the board is not dead.
    2450.bq20zxx_GeneralTroubleshootingChecklist.doc

    If the part does start, there will initially be a CUV flag in the data flash because the default DF configuration is for 3 cells. You will have to change the DF config to be for 2 cells.

    This quick start guide should help you get started: http://focus.ti.com/lit/an/slua421a/slua421a.pdf

    Regards,

    Viktoriya

  • 0 in reply to Viktoriya Sherman
    Prodigy 195 points

    Thank you very much for your answer, Viktoriya.

    I jumpstarted correctly the board using a 11.1V power supply connected to the PACK+ while also having a resistor devider (3 x 1k) connected to the BAT which is also supplied by 11.1V. (see picture)

    I checked all pins for correct in and output (and tested the DISP button -> LED1 turns on). That so far seems to work but as soon as I remove the PACK+ supply the DSG FET interrupts the connection between BAT+ and PACK+. Same is for removing the BAT supply (CHG FET turns off).

    I also went through your checklist (thanks again for that) and as far as I can say it seems all normal.


    Since I still haven't got the EV2300 I can't read out the flags and registers yet but in principle connecting a valid battery (3 cells, charged,... simulated like I did) to the board (having it jumpstarted before of course) should result in beeing able to pick off the battery's voltage at the PACK+, or am I wrong?

     

    regards, Frank

  • 0 in reply to Frank Thomas
    TI__Intellectual 930 points

    At default, the FETs are open because Impedence Track is disabled. Once you have the EV2300 you will be able to communicate with the board.

    When FETs are closed, you will be able to read the battery voltage across pack+

    If the thermistor and regulator measurements were correct according to the checklist, then the part is alive.

    Regards,

    Viktoriya 

  • 0 in reply to Viktoriya Sherman
    Prodigy 195 points

    Thanks, Viktoriya, for your quick response.

    So the conclusion to this is, that the bq20z65 is coming with a preloaded firmware providing default settings and auto calibration ability but to actually use it  I still have to 'program'  and calibrate it? And the "evaluation module (bq20z65EVM) [which] is a complete evaluation system" doesn't make any difference to that situation? That would be a great pity because I was hoping to get it running without additional programming since I have no special requirements - just see that it works in general. Unfortunately, waiting for the ev2300 costs me a lot of time.

    Please let me know if there's anything to speed up my progress.

    (otherwise I would close this thread)

    regards, Frank

     

     


  • 0 in reply to Frank Thomas
    TI__Intellectual 930 points

    The bq20z65EVM does have auto offset calibration and it is providing default settings but it is a flexible part allowing for different battery chemistries and settings. In order to configure the part to work for your particular application you will have to wait for the EV2300 or a different SMBus communication.

    Once you can communicate to the part you will be able to configure it for your particular application using bqEASY (which is included in the EVSW).

    If you have followed the checklist and have no issues, the part should be alive but in order to see its accuracy with your battery you will need to be able to communicate to it.

    Regards,

    Viktoriya