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BQ78350-R1: BQStudio Error

Conner Sandt
Prodigy 40 points
Part Number: BQ78350-R1
Other Parts Discussed in Thread: BQSTUDIO, BQ76940, TIDA-00792, BQ78350, EV2400

Using the BQStudio software the bq78350-R1 shows up at launch, but only appears for a few seconds. When trying to change the settings an error code pops up that says, "operation failed because initial read of all data flash failed." What does this mean and do I need to configure this device in order for it to communicate with the BQStudio? I assumed this would auto detect the configuration. For reference I am using 11 18650s for this device. 

  • 0
    TI__Guru* 81035 points

    Hi Conner,

    It is losing communication with the device for some reason. Have you booted the BQ76940 AFE (the AFE supplies power to the BQ78350-R1)? Another possibility is the device could be going into voltage Shutdown if the AFE Cell Map is not configured for the number of cells connected.

    Are you using an EVM or a board you designed?

    Thanks,

    Matt 

  • 0 in reply to Matt Sunna
    Prodigy 40 points

    I am using the TIDA-00792: http://www.ti.com/tool/TIDA-00792

    I assume the BQ76940 is booted as the battery and all individual cells are plugged into the PCB.

    How would I configure the AFE Cell Map?

    Thanks

  • 0 in reply to Conner Sandt
    TI__Guru* 81035 points

    Yes, there is a boot circuit on this TI Reference design that will boot the BQ76940 as the pack is connected. You should monitor the VCC pin of the BQ78350-R1 to make sure the BQ76940 is awake - the BQ76940 REGOUT pin connects to VCC of the BQ78350-R1.

    The AFE Cell Map is one of the data flash parameters in the BQStudio Data Memory screen.

    How have you connected your 11 cells? Are you following the recommended connections based on Table 26 in the BQ76940 datasheet?

    Thanks,

    Matt

  • 0 in reply to Matt Sunna
    Prodigy 40 points

    Yes I have all the cells configured correctly and the proper connections are shorted like in Table 26. So the AFE Cell Map needs to be changed in order for this device to be detected? 

  • 0 in reply to Conner Sandt
    TI__Guru* 81035 points

    Hi Conner,

    The device should be detected without modifying the AFE Cell Map. In your description, it sounds like you do see BQStudio detect the device and then lose communication. That is why I asked about your cell connections (can you share this?) and AFE Cell Map - if one of the cells if measuring below the Shutdown voltage, the device could be shutting off. This would be easy to tell if this is happening by measuring the voltage on the REGOUT pin of the BQ76940 (VCC pin of the BQ78350) as I suggested. Have you checked this?

    If the device is never really being detected, you may need to look at your SMBus connections. How are you connecting from your board to the PC - I assume you have an EV2400 module for this interface? SMBus needs pullup resistors - do you have these?

    Regards,

    Matt