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BQ76PL455A-Q1: Communication issue with MCU

Venkatesh Maddukuri
Prodigy 50 points
Part Number: BQ76PL455A-Q1

Hi sir,

We are using 5 PL455 in series and communicating with MCU ,Initially communication between PL455 and MCU is good  but after few minutes we are not able to get the communication .

1. Which command should be used to reset the Communication request?

2. We have tried with the command mentioned in the Software Design file ,but the PL455A is not getting reset with the command provided.

3. Do we have to send any other baud rate etc along with communication reset request?

4. we also tried with auto addressing request but communication request is not happening?

Please help with the solution

Thanks

MV

  • 0
    TI__Intellectual 1760 points

    Hi MV,

    1. Communication reset occurs by holding RX line low. When comm reset is used the baud rate will reset to a known baud rate of 250k. More details can be found in section 7.3.9.5 of the datasheet
    2. Double check the baud rate. With communication reset the baud rate will be set to 250k.
    3. The MCU will need to verify the correct baud rate 
    4. If the baud rate is not the issue, I recommend double checking the communication timeout. CTO[COMM_PD_PER] sets the timeout for UART commands, after which the part will enter shutdown. It is possible that the part is entering shutdown and needs to be rewoken.

    Thanks,

    Geoff