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TCAN1463-Q1: TCAN1463-Q1 : Query on WUP

sameer udan
Prodigy 10 points
Part Number: TCAN1463-Q1

Hello,

I'm currently working with Network Management topic and aiming to enable Pattern-based wakeup (WUP) for TCAN1463-Q1 for my project's Electronic Control Unit (ECU). Although I've reviewed the datasheet, I find myself with some unresolved questions. Could you provide clarification on the following points?

  1. Is WUP automatically enabled in TCAN1463-Q1, or is there a specific configuration needed?
  2. If WUP isn't enabled by default, what steps should I take to enable it for a particular message? Currently, my ECU is waking up for all received messages.
  3. Once I've implemented/enabled WUP for a specific message, what would be the best approach for testing it?

I appreciate any assistance you can provide on these matters.

Best Regards,

Manu Sharma

  • +1
    TI__Guru 50515 points

    Hi Manu,

    Thanks for bringing your questions to E2E. We're happy to help clarify the information on Wake Up Patterns and how our CAN transceivers respond to this input. 

    sameer udan said:
    Is WUP automatically enabled in TCAN1463-Q1, or is there a specific configuration needed?

    Wake via CAN WUP is automatically enabled when TCAN1463 is in sleep mode. The transceiver will use the Vsup supply to power an internal low power receiver that monitors the CAN bus for activity. When the device recognizes any CAN traffic, it will automatically move to standby mode and drive the INH signal high to wake the rest of the system. Note that Vcc and Vio are not needed when in sleep mode, though it is no problem if these remain active. 

    sameer udan said:
    If WUP isn't enabled by default, what steps should I take to enable it for a particular message? Currently, my ECU is waking up for all received messages.

    Support for WUP recognition is standard for all CAN transceivers that support standby and sleep modes. This wake method looks for a simple filtered pattern on the CAN bus which will be satisfied by any valid CAN frame - meaning that such devices will wake to any CAN message. In order for a transceiver to wake to only specific messages, it needs to be able to interpret the information on CAN bus while in sleep mode. Such devices need to support the feature called selective wake (which supports the partial networking system function). The TCAN1145 is a similar transceiver that supports this feature so that unwanted CAN messages will be ignored and leave the transceiver in sleep mode. The CAN SIC version of our partial networking device the TCAN1469 is still in development,  but will be available soon. 

    sameer udan said:
    Once I've implemented/enabled WUP for a specific message, what would be the best approach for testing it?

    In order to test a partial networking configuration, I typically use a second CAN transceiver and controller to send either an undesired CAN ID or the configured wake ID to confirm that the transceiver will either ignore or wake to the expect frames. 

    Let me know if you have any more questions. 

    Regards, 
    Eric Schott