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Original question:

BQSTUDIO: Communication with multiple devices

BQSTUDIO: Multiple devices on I2C

Darren Jenkins
Genius 10806 points
Part Number: BQSTUDIO
Other Parts Discussed in Thread: BQ34Z100, BQ25750, BQ76942, EV2400

BQStudio team,

Our customer has designed a battery pack with BQ25750, BQ76942 and BQ34Z100.  All three are on the same I2C bus.  

The communications with the 3 devices through the EV2400 to BQStudio is very unreliable.  The worst at responding is the BQ76942.  The BQ25750 is more reliable. 

He has followed the advice at the thread linked here as the "related question", which makes it a little better, but it is still not reliable.  Is there any newer advice?

Thanks,
Darren

  • 0
    TI__Mastermind 23516 points

    Hello Darren,

    Which device are you referring to when you say "Is there any newer advice?"

    Likely you will need different EV2400 for each device and run them with different BQStudio instances. There's been similar questions asked here in the forum that you can reference to. 

    Regards,
    Jose Couso

  • 0 in reply to Jose Couso
    TI__Genius 10806 points

    Hi Jose,

    The post I was referencing is from about 3 years ago, so when I asked for newer advice, I was wondering if we had made any software improvements since then that would change the advice we would give a customer in this situation.

    This issue appears to come up pretty often, and I've read those other discussions.  There's one thing that I didn't understand.

    They say to use 2 EV2400, but the customer has 3 devices on the I2C bus.  (The customer I'm talking to has 3 devices, and the customer on the older post has 3 devices, so I don't understand why the advice was to use 2 EV2400.)  Should they use one EV2400 for each device on the I2C bus?

    Thanks,

    Darren

  • +1 in reply to Darren Jenkins
    TI__Mastermind 23516 points

    Hi Darren,

    I suggest to use one EV2400 for each device. So, in total 3-EV2400s. This is only for testing purposes I assume. 

    The Charger IC does not need much user interaction unless the charging current and voltage is being changed periodically. 

    Regards,
    Jose Couso

  • 0 in reply to Jose Couso
    TI__Genius 10806 points

    Thank you, Jose.

    Darren