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Bq30z554 EVM : Communication problems VB_T2H_NACK

Thomas Bacher
Prodigy 40 points

Hello,

I am using a Bq30z554 for SAFT FRANCE with the last software version bqEVSWSetup00.09.92.

To test this bq and the evaluation software, i connected a 3-cell pack to the circuit module , a SMBus cable to the EV2300 module and a USB cable as mentionned in the document SLUUA36

However, while starting the evaluation software I got this communication problem : VB_T2H_NACK.

From the different documents and forums on TI, I tried some tests to pass through this communication problem such as :

- testing an other EV2300 module --> no result

- testing an other USB cable --> no result

- Ohm the 4-pin USB cable --> electrical connection OK

- Check for bent or contaminated pins on the EV2300 SMBus connector --> no contamination or bent

- Kick start the EVM by connecting power momentarily to PACK+ and PACK - to simulate a charger insertion --> no result

As I took this project over a Junior engineer, the last software version and TI USB Drivers were yet installed on the computer I use.

Can someone help me to go through these communication problems?

Thanks in advance,

Sincerely

Thomas Bacher

  • 0
    TI__Guru 73830 points

    Thomas,

    The device may not be powered up or it could be in ROM mode. Check the REG33 and REG25 outputs to verify that 3.3V and 2.5V are present. If the voltages are okay, then the device is powered up. If they are not present, then apply the charger continuous and check again. To check ROM mode, go to the Pro screen and use the Read SMB Word command 0D.If it returns 0502, then the device is in ROM mode and you can try the Send SMB Command 08 to return it to normal mode. If it does not return to normal mode, then reload the default senc file and see if that helps.

    Tom

  • 0 in reply to ThomasCosby
    Prodigy 40 points

    Tom,

     

    Thanks for your answer. Here are some new elements:

    - After checking the REG33 and REG25 outputs, even with a charger continuous, they both gave a 0V answer.

    - On the PRO Screen, I tried to use Read SMB Word Command 0D and Send SMB Command 08 but they both gave me the following answer : “Error Code: No Acknowledge : VB_T2H_NACK”

    - When I tried to reload the default senc file BR_BQ30Z554_MAIN_RTT_001_BLD_69.senc on the Srenc Programming, I got this answer: “Communication Code! Error Code (decimal) = 722”

    - To finish with, I tried to uninstall and reinstall the EVSW bqEVSWSetup00.09.92_bq30z554v0.11R1d.exe but, after the installation, the TI USB DRIVER INSTALLER never popped up as mentioned in the technical document SLUUA36.

     

    Do you have any TI USB DRIVER INSTALLER that I could install on my computer to try recovering communication please? Or what step could I do to recover communication?

    My address email is the following: thomas.bacher@saftbatteries.com

     

    Thanks in advance,

     

    Thomas

  • 0 in reply to Thomas Bacher
    TI__Guru 73830 points

    Thomas,
    If the REG25 and REG33 outputs are 0, then the device is dead. Or, there is no voltage getting to the device. That issue has to be resolved, before working on any communications / driver problems.

    Tom