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BQ79616-Q1: Difficulties in waking BQ79616 self developed board.

Jake Hough
Prodigy 10 points
Part Number: BQ79616-Q1
Other Parts Discussed in Thread: BQ79616, USB2ANY

Tool/software:

Dear TI support team,

I am involved in the hardware development of our battery management system using the BQ79616 and BQ79600 with a STM32 for our Formula Student vehicle.

We have recently received our custom developed boards and have problems connecting using the provided BQ auto EVAL software in testing. We are trying to wake the device using UART, we are able to send the wake ping on RX pin of the device however see no response on the TX pin. The LDOIN supply is 4.6V but both DVDD and AVDD both measure 0V.

Our concerns is the device is latched in a shutdown mode and we have two possible theories. Firstly being a communication fault when communicating using the USB2ANY through the wake procedure. We have added relevant 1k termination resistors across all unused COMM channels during the single board testing, but the issue persists. The second potential reason we believe the device isn't working because of it being in a permanent thermal shutdown state due to hand soldering at 350 degrees, however our interpretation is that thermal shutdown can only be triggered once the device is powered.

Your feedback would be highly valuable.
Thank you.

  • 0
    TI__Expert 5850 points

    Jake,

    The LDOIN voltage is below the minimum required of 5.9. The most likely scenario is the device is not getting enough voltage from the batteries. The voltage required to power the device would be dependent on the exact voltage divider used and bat voltage used, but using our schematics it is around 12 volts.

    While this voltage is below the required minimum, it will be impossible to wake the device or communicate with it.

    Regards,

    Bo 

  • 0 in reply to Benjamin Luty
    Prodigy 10 points

    Hi Benjamin, 
    I am powering the device through a 18V power supply like the EVM board so I don't believe this is the issue.
    Thanks
    Jake

  • 0 in reply to Jake Hough
    TI__Expert 5850 points

    Jake,

    Can you measure what is on the CVDD pin? It should be similar to your LDOIN voltage. This indicates the device is correctly powered. 

    Additionally, If the DVDD and AVDD supplies remain zero the device did not receive the WAKE ping, and the device would remain in SHUTDOWN mode. If possible, can you use an oscilloscope to see the waveform received by the RX pin of the device? This would tell us if the voltage across the pin is enough to meet the requirements to be read by the device as an one or a zero. (It should be above ~3.4 to be registered as an one and below ~1.1 to be registered as a zero.)

    Regards,

    Bo