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BQ79718EVM-049: BQ40Z50EVM-561

Pankaj Sawarkar
Prodigy 170 points

Part Number: BQ79718EVM-049

Query: - How to generate digital signal at GPIO for indication of UV or OV fault.

Query Details: - Hi, I am using BQ79718EVM-049 board with BQ797XX 2.0.4 GUI for my current BMS project. I want to use GPIO as fault indicator, means when UV fault exist in the system, the particular GPIO should be turn HIGH (5V) otherwise should be LOW (0V).  I want to interface BQ79718EVM-049 board with other converter for controlling their operation. My question is will it be possible with BQ79718EVM-049 board. If yes please share the procedure, Please help us,

  • +1
    TI__Expert 3760 points

    Hi,

    That's a great question. You can use GPIO2 to indicate faults with an active low signal (if there is a fault the GPIO2 will turn LOW (0V)). This can be done by setting the DEV_CONF1[NFAULT_EN] bit to 1. However, this cannot be used to trigger only for a undervoltage fault. This will pull GPIO2 low for any device fault. In order for the system to work as you described, the MCU would have to poll the faults from the FAULT_SUMMARY registers to determine if there is a UV fault and then send the appropriate signal to the other converter. Please let me know if you have additional questions. 

    Best,

    Nancy

  • +1
    Prodigy 170 points

    Can we use LAUNCHXL-F280049C at the place of TMS570LS1224 MCU ?

  • +1
    TI__Expert 3760 points

    Hi,

    Yes, you can use this EVM since it communicates via UART. However, you will need to port over the existing sample code to be compatible with this MCU. 

    Best,

    Nancy