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Original question:

BQ76930: Communication with BMS

BQ78350-R1: No communication between IC and computer

Yusuf KAYA
Intellectual 630 points
Part Number: BQ78350-R1
Other Parts Discussed in Thread: BQ78350, BQ76930, EV2400, BQSTUDIO

Hi,

There is 2.5V supply provided by BQ76930 IC to BQ78350 IC. However, no communication between BQ78350 and computer. I am using EV2400 interface. I have replaced the BQ78350 IC with new one a couple of times.

There is no communication between them while supplying the BMS by external charger as well.

Would you help me solve the problem?

Thanks.

  • 0
    TI__Guru* 81035 points

    Hi Yusuf,

    Are you using an EVM or a different board? Are you using the BQStudio software? 

    In the BQStudio software Dashboard, it will show if the EV2400 is detected and it will show if the BQ78350 IC is detected. Can you send a screenshot of this image?

    Do you have pullup resistors connected to the SMBus signals?

    Best regards,

    Matt

  • 0 in reply to Matt Sunna
    Intellectual 630 points

    Hi Matt,

    I have designed a board nearly the same as EVM board.  I am using BQStudio software with EV2400 interface for a long time and i can see the version number of the EV2400 on the dashbord. So dashboard shows us that the EV2400 is detected. But there is no communication between BQ78350 and bqstudio. Actually I have a couple of boards. they can establish communication with bqstudio but one of them can not do it.

    Thank you.

  • 0 in reply to Yusuf KAYA
    TI__Guru* 81035 points

    Hi Yusuf,

    I am not sure why you would see different results from board to board. Do you have a proper ground connection between the EV2400 and your board? Look for any differences between your board design and the EVM that might provide clues.

    Matt