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TCAN11625-Q1: TCAN11625-Q1 how to proactively send data

Vayne Li
Expert 1150 points
Part Number: TCAN11625-Q1


Tool/software:

We use TCAN11625, where the RST pin is first reset low, then raised, and then nSLP is raised. The condition for entering Normal is met when Vio is 3.3V, but it cannot actively send data and needs to receive one frame before continuing to send data normally. Is this a limitation of this chip, or is there any way to actively send data?

  • 0
    TI__Guru 74322 points

    Vayne,

    The TCAN11625-Q1 should be able to automatically send data once it is in Normal mode, what is the state of the TS pin prior to sending the message that allows for communication in their setup? Needing to receive a message before being able to send sounds like there needs to be some sort of wake event, but if the requirements for Normal mode are confirmed (VIO is supplied, nSLP is logic high), then this shouldn't be the case.

    Regards,

    Eric Hackett 

  • 0 in reply to Eric Hackett
    Expert 1150 points

    Hi Eric,

    Thanks for reply,the current situation is that after powering on, TCAN11625 is reset, RST is first raised for 100ms and then lowered, and it cannot actively send messages. Only by receiving one frame of data can it be sent actively. STB is lowered, and the TS pin is configured as an up input.

    After resetting, read the TS status is 0.

  • 0 in reply to Vayne Li
    TI__Guru 74322 points

    Vayne,

    RST and TS should both be in a logic high state if the device is in Normal mode and able to communicate. Is nRST being driven high and then low in the step "RST is first raised for 100ms and then lowered"? Or is this the output of the pin?

    From the sequence of events, it seems like the device is in Sleep mode, then once the CAN message is received, a wake event is registered, it goes into Reset mode, then continues to Normal mode based on the state of the nSLP pin. What are the states of nRST and TS once communication can work in their system?

    Regards,

    Eric Hackett