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TCAN1043A-Q1: TCAN1043A state machine

Scarlett Cao
Expert 3900 points
Part Number: TCAN1043A-Q1
Other Parts Discussed in Thread: TCAN1043

Hi team,

Could you please help us confirm for TCAN1043, during sleep state, when VSUP and VIO power up, VCC UV or power loss, if customer receive WUP or LWP, can device wake up from sleep to normal mode? 

From the state machine my understanding is IC will enter standby mode, but it still requires VCC power up to enter normal mode.  Can device wake up to normal mode when pull nSTB?

And the same question for TCAN1044, TCAN1145, TCAN1462 and TCAN1463. 

Thank you

Scarlett

  • 0
    TI__Guru 73472 points

    Scarlett, 

    Thanks for bringing this to E2E, we'll have a response to you by end of business on Monday 08/07/2023.

    Regards,

    Eric Hackett

  • 0 in reply to Eric Hackett
    TI__Expert 3900 points

    Hi Eric

    Thank you. Since customer is urgent to freeze their design so please help share your feedback within today. 

    Thank you

    Scarlett

  • 0 in reply to Scarlett Cao
    TI__Guru 52435 points

    Hi Scarlett,

    I'm not sure I quite understand the question here, but I'll describe the behavior I believe is relevant to what the customer is asking:

    When a transceiver is in a low power mode such as sleep or standby, it uses a low power receiver to monitor the bus for a WUP and the WAKE pin for a LWU. This low power transceiver does not have the same supply requirements as the high-speed CAN receiver used in normal mode. Devices such as TCAN1043A that have a dedicated Vsup input can supply the low power receiver using only the battery voltage so wake-up monitoring can be done without Vcc or Vio supplied. 8-pin transceivers with Vio support such as TCAN1044AV can power the low power receiver with the Vio input so Vcc may be disabled. 

    In order for any transceiver to move to Normal mode, all supply inputs must be present so the high-speed receiver and CAN driver may be properly supplied. Therefore, for TCAN1043A to move from Standby mode (which only requires Vsup) to Normal mode, Vcc and Vio must also be present. 

    Let me know if this is clear and if there are any more questions about this behavior.

    Regards, 
    Eric Schott