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BQ76PL455A-Q1: CheckPoints to verify functioning of IC

Kartik Shanbhag18
Intellectual 600 points
Part Number: BQ76PL455A-Q1
Other Parts Discussed in Thread: LAUNCHXL-TMS57004, EM1402EVM

Hello.

We are using BQ76PL455A-Q1 (IC,not EVM) for monitoring and passive balancing of 14 cells. The circuit connections have been made as mentioned in the typical application of the datasheet. We wanted to know if there were any checkpoints on the IC that we could check and ascertain that all  the required connections for the IC have been made by us.

For example:- voltages across pins V5VAO,VM,VREF,VDIG etc. After the 14 cells (to be monitored) are connected, will these pins show output even if the host controller is not connected. If yes, what voltages do they ideally have to show, if all connections were made correctly.

If not, are there any others pins that can indicate correct connections to IC.

  • 0
    TI__Genius 11480 points
    Hi Kartik,

    If the IC is connected to cells, you can check the 5VAO connection (it should be ~5V all the time). Once the IC is woken up through either a wakeup pulse from the MCU (base device) or from the wakeup tone (stacked devices), then the other supply rails will come up.

    You can also read back something like the SREV register or device register to check for UART.
  • 0 in reply to David Wiest Jr
    Intellectual 600 points

    Thank you for your quick response David.

    V5VAO is showing 4.5V across it. But the rest of the power rails are not showing any voltage despite the WakeUp signal being given by the host controller. UART communications are also not happening.The host controller being used is LAUNCHXL-TMS57004 and the code is as provided in the EM1402EVM software.

    Also, the Fault_N pin is showing zero voltage. Is that an indication of a fault as a result of which UART communication is not happening?

  • 0 in reply to Kartik Shanbhag18
    TI__Genius 11480 points
    Kartik,

    Can you verify that the comm mode switch is in the correct position (single if only using 1 board vs diff if using a bridge IC and communicating through daisy chain)
  • 0 in reply to David Wiest Jr
    Intellectual 600 points
    David,

    We are using only one IC and not daisy chain configuration. There is no comm mode switch.

    Also, could you please provide clarification regarding the Fault_N Pin, as asked by me in the previous response.