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BQ79600-Q1: BQ79600 Wake Problem

Mustafa Tarhan
Intellectual 1220 points
Part Number: BQ79600-Q1

Tool/software:

Hi 

Our customer Vestel is working on a BMS system solution and they had some problems to wake BQ79600 up.

In their system, they use the BQ79600 AFE as a bridge and communicate with 79731 AFE. they pull the tx pin they have communicated to raise the 79600 to the LOW state and hold it for 2.5 ms and then lift it up again. This way they can get up and communicate. However, in some cases this does not work, but it also starts to work when they power off the system and power it up again. they think the reason for this situation is due to the statues that may have entered AFE, but they could not find anything in Datasheet, can you help me with this? 

  • 0
    TI__Expert 4470 points

    Hello Mustafa,

    It could be a couple things. 
    Two things I would check is do you have the board configured for UART and are you using enough power? Our EVM is supplied by either 5V or 12V.

    Another thing to check is the communication timeout. Perhaps they are not communicating and the device is going to shutdown?

    Let me know about these items.

    Best,

         Quentin

  • 0 in reply to Quentin Silic
    TI__Intellectual 1220 points

    Hi Quentin,

    Here is the response from customer side.

    *************

    1. We do it on our own board, but we rarely see this case (like every 10-15 days). As you said, even if it is from a power failure, we wanted to examine the software-induced situations while examining these. This made the mind think that AFE could be inadequate in a state that is different from normal stats and WAKE tone that we use under normal conditions.
      when energy comes to AFE under normal conditions, let’s assume that it is in the shutdown state, the WAKE tone we send is enough to WAKE up and communication starts.
    2. in the case we encounter AFE somehow X is not enough to pass to a state and wake tone (x shutdown, shutdown active).
      example number 2 is my assumption, i actually wanted to ask you if such a situation exists.
      On the other hand, we can investigate whether the problem is caused by power, do you have a suggestion for this?
  • 0 in reply to Mustafa Tarhan
    TI__Expert 4470 points

    Mustafa,

    Seeing as this only happens once every 15 days, then it sounds like it may not be related to power.
    When the wake ping does not work for the BQ79600, do you do any retries before power cycling?
    Did you confirm that the 2.5ms pull down is actually working on the occasions this happens?

    This is not calling to mind any similar cases I have seen in the past.

    Best,

         Quentin