• State Resolved
  • Locked Locked
  • Replies 2 replies
  • Subscribers 62 subscribers
  • Views 666 views
  • Users 0 members are here
Support feedback
Options
Options
Similar topics

This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

BQ78350 damage

martin gibbs
Intellectual 520 points
Other Parts Discussed in Thread: BQ78350, BQ76930, EV2400, BQSTUDIO, BQ76930EVM, BQ76940

Good Morning Ti,

I am just evaluating the bq78350 and bq76930 combination EVAL board. Having got thru the 76930 steps OK, I am having trouble with the bq78350. Could you assist please?

Whilst programming with the EV2400, the LEDs came on very bright and programming failed. Nothing as catastrophic as another member experienced see “re-blown bq78350” as I switched off before getting too hot.

However I did manage to persevere and program the srec with an EV2300. Unfortunately I think my gauge IC is possibly damaged as the bqstudio dashboard greys in and out with occasional timeouts messages and I don’t see as per page 22 of the EVAL User guide.

I am going to change the IC with a sample device provided by Ti. Thankyou.

My questions are:-

  1. Is the EV2400 programming blown IC issue resolved?

  2. Is there a new srec file? I am using - bq78350_v0_06_build_16.srec.

  3. Should I see as per page 22 of the User guide with no greying out of the dashboard? Note also no cell voltages measured.

Thankyou.

Regards

 

Martin Gibbs

4061.bq78350 forum question.docx

 

  • 0
    TI__Guru 54715 points

    Hi Martin,

    1. I have not heard that the EV2400 is resolved yet.  Please continue to use the EV2300.  I would expect some change in the "important notice" on the EVM website page when it is resolved.

    2. v0_06_build _16 is the current file

    3. The occasional graying out of the dashboard and errors is often due to I2C communication problems between the gauge and the AFE.  The AFE communications is a high priority and if there is some disruption the gauge spends most of its timeline trying to talk to the AFE and SMBus communication may be missed.  Remove any connection to the I2C connector. Check the pull up shunt installation on the I2C - if you were using the EV2400 to talk to I2C you would have removed the pull up shunts.  Be sure the pull up shunts are re-installed for the gauge to talk to the AFE.  Check the I2C shunts on the gauge to AFE header (J14 on the bq76930EVM).  You could inspect the I2C lines with an osciloscope, normal is bursts of traffic every ~ 250 ms.  If the traffic is continuous there is some problem.  Check for damaged shunts or contamination on the connections, or unexpected conductors on or under the board. Check for a stable REGOUT voltage (2.5V) and that it gets to the GG_PWR and is still stable.

    It could be a damaged IC, either the AFE or gauge.  If you disconnect the gauge from the AFE (at J14) you can connect the I2C to the EV2300 (I2C connectors on both the EV2300 and EVM) and try to talk to the AFE with the bq76940 software to confirm the AFE talks.  Be certain to remove the I2C connection and re-install the shunts to the gauge after checking the AFE .

  • 0 in reply to WM5295
    Intellectual 520 points

    Many thanks. Ti has sent me 8 replacement devices.

    I have replaced and programmed and all is good. (Though concerned that FW can damage chip.)

    Regards,

    Martin