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BQ40Z50-R2: BQ40Z50 Configuration

Kipton Moravec
Expert 1545 points
Part Number: BQ40Z50-R2
Other Parts Discussed in Thread: EV2400, BQSTUDIO

Tool/software:

I am working with the BQ40z50EVM and have followed the steps in the user guide to set it up. Here are the steps I’ve taken:

  1. Connected 4 batteries (ICR18650 3.7V 2500mAh) in series.
  2. Connected the power supply to PACK+/PACK-.
  3. Connected the serial communication port to the EV2400.
  4. Downloaded the bqStudio software.
  5. Connected the System-present pin to PACK-.
  6. Changed the DA register to set up the number of series cells to 4.
  7. Verified communication with the device.
  8. Set up the chemistry screen.

Despite following these steps, the BQ40z50EVM does not output voltage when a load is connected, and there is no indication that the chip is charging.

Could someone help me troubleshoot this issue? What could be the potential causes and solutions for the chip not outputting voltage or indicating charging?

  • 0
    TI__Mastermind 28490 points

    Hi Kipton,

    Kipton Moravec said:
    Despite following these steps, the BQ40z50EVM does not output voltage when a load is connected, and there is no indication that the chip is charging.

    Just to confirm, there is no indication that the device is charging or discharging when a load is attached to the PACK pins?

    How are the FETs being enabled, are they being controlled by the gauge using the FET_ENABLE command or are they being controlled manually?

    Regards,

    Anthony Baldino

  • 0 in reply to Anthony
    Expert 1545 points

    Hi Anthony,

    Yes, there is no indication that the device is charging or discharging when a load is attached to the PACK pins.

    The FETs are enabled by turning on the charge and discharge FETs using the 0x0022 command in the Manufacturer Access register.

    Thank you

     

  • 0 in reply to Kipton Moravec
    TI__Mastermind 28490 points

    Hi Kipton,

    What are the CHG Current Threshold and DSG Current Threshold parameters set as? Are these thresholds being met when the load is attached for either charge or discharge?

    Regards,

    Anthony Baldino

  • 0 in reply to Anthony
    Expert 1545 points

    Hi Anthony,

    Thank you for your response.

    I’m currently using the default values for the CHG Current Threshold, which is set to 500 mV. To enable the FETs, I’m sending the 0x0022 command.

    Additionally, I calibrated the temperature to 25°C, but I’ve noticed that in the dashboard on the left of bqStudio, the temperature is displayed as -273.2°C. I’m using the BQ40z50-EVM, which has built-in temperature sensors, so I suspect I might still be missing something in the configuration.

    For my setup:

    • I’m using a DC power supply set to 14.6V and 2A for charging.
    • I’m using a programmable load set to 12V and 2A for discharging.

    Any insights you could provide would be greatly appreciated.

    Thank you for your help.

    Best regards,

  • 0 in reply to Kipton Moravec
    TI__Mastermind 28490 points

    Hi Kipton,

    Thanks for the clarification. Since you are clearing the threshold with your charge/discharge current with FET enabled, current should be able to pass. If you can confirm the status of the bits below, it would help us confirm why current is not being passed:

    1) [XCHG] and [XDSG] in Operation Status A. These bits will disable the CHG or DSG FET typically if there is a protection triggered.

    2) If there is any bit set in the Safety Status or PF Status registers. This will confirm if a protection is being triggered.

    Regards,

    Anthony