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EV2300 evaluation board damaged, how can i test?

Test Person
Prodigy 60 points
Other Parts Discussed in Thread: BQSTUDIO, EV2400, BQ78350

Hello,

i have a EV2300 interface board connected with SMBus to a 14S battery BMS and when discharged the battery to undervoltage cut off (while connected to EV2300), the BMS cut off like programmed. But after that, i can´t connect the EV2300 any more to the BMS board, also not to two other new one BMS boards. It seems, that the EV2300 board is damaged. Is it possible in this way? How can i test the EV2300 board? Is there a tool availible to test the EV2300 board or something like that? A possibility to repair?

Thank you.

  • 0
    TI__Guru* 81034 points

    Hi,

    Here are a few things you can try to diagnose your board. First, download the EV2300 User Guide (http://www.ti.com/tool/EV2300) so that you can reference the board schematic.

    1. First try to connect the EV2300 to a PC and open bqStudio. If the PC is able to communicate, the Dashboard should show the EV2300 and the firmware version.
    2. Disconnect the device from the PC. Open up the case by removing the two small screws. Things to check while the board is not powered:
      • Look for any signs of damaged components.
      • Measure the series resistors for the interface you are using. For example measure R49 and R50 for I2C, measure R13 and R15 for SMBus.
      • Measure the resistance between test points J11 (negative terminal) and J8 (positive terminal). Resistance should measure > 6 MOhm
      • Measure the resistance between test points J11 (negative terminal) and J9 (positive terminal). Resistance should measure 100-200 kOhm
      • Plug in the USB cable. Confirm that D12 is lit and D20 flashes right after the USB cable is plugged in.
      • Measure the voltage between J8 and GND (should be 5V). Measure the voltage between J9 and GND (should be 3.3V). 
      • Replace any suspected components if measurement results are not as expected.

    3. If everything looks okay on the hardware, replace the case on the EV2300. You can next try reprogramming the firmware in case something has been corrupted. You can find the firmware updater along with the instructions in this thread: https://e2e.ti.com/support/power-management/f/196/t/317313

    If you are able to get the EV2300 working again, you will need to identify how it was damaged by your system so that you can prevent the issue from reoccurring. 

    If you are unable to fix or resolve the issue and need to purchase a new communication module, we recommend the EV2400 since the EV2300 will soon no longer be in production. 

    Best regards,

    Matt

  • 0 in reply to Matt Sunna
    Prodigy 60 points

    Hi,

    thank you very much for detailed answer.

    I have checked all:

    firmware is 3.1c

    first R = about 10 - 50 MOhm

    second R = 171 kOhm

    D12 lits green, o.k.

    D19 flashes all 5 - 10 seconds a bit green

    D20 lits after powering on for 1 second red.

    Voltages of 5V and 3.3V are o.k.

    But with bqstudio, there is still no connection to BMS board possible. (See attached, please.)

    I think, next attempt could be to update firmware?

    Is it possible to update adapter with no second one?

    Thank you, best regards,

    Markus

  • 0 in reply to Test Person
    TI__Guru* 81034 points
    Unfortunately, you would need a 2nd EV2300 to update the firmware to a newer version. From the many posts on E2E about firmware version 3.1c, it has been very problematic.

    Matt
  • 0 in reply to Matt Sunna
    Prodigy 60 points

    Hi,

    that is really unfortunately. I think, i will not buy a second device, when i do not know, if it solve the problem at the first and i also do not know, if it stops working from one moment to another like the first. (That i now need a second same device for firmware update is for me the second bug at this kind of devices.)

    So, i think, it is then better to stop using this typ of battery management systems.

    Is there no other way to flash a new firmware on the evaluation board or an other way to find out the reason, why it does not work any more?

    Or is there an other possibility to connect to BMS modules with bq78350?

    Best,

    Markus

  • 0 in reply to Test Person
    TI__Guru* 81034 points
    Hi Markus,

    The best option is to switch to the EV2400. This device has been out for a few years and is the recommended tool. The EV2400 can be updated more easily and does not have the issues you are seeing with the EV2300.

    Best regards,
    Matt
  • 0 in reply to Matt Sunna
    Prodigy 60 points

    Hi Matt,

    i have not so much BMS modules with TI chips any more. So, if there is no other (more economic) possiblity to fix problems with programming adapter, i think, i will discontinue using BMS modules with this kind of chips.

    Best regards,

    Markus

  • 0 in reply to Test Person
    TI__Guru* 81034 points
    Hi Markus,

    Sorry to hear that. I understand the frustration. The EV2400 is a much better solution that does not have the issues of the EV2300.

    It's also not clear that the EV2300 is the issue. You say it was working until you had an undervoltage cutoff event. It's possible a new tool could be damaged without understanding the issue.

    Regards,
    Matt