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TCAN1043A-Q1: CAN transreceiver INH not acitive in the standby mode

Tendulkar Selvam
Intellectual 255 points
Part Number: TCAN1043A-Q1


Hi ,

Good Day,

Our project requirement as follows.

1.we have to enable the ECU using INH pin while wake up input is is active low signal(500msec stays low while ECU needs to be enable and stays high after enable i.e High to Low and low to  High pulse with 500msec low timing duration) - Local wakeup and VBAT(12V) is connected to VBAT pin i.e INH needs to be disabled/not activated in standby mode.

2.and CAN data remote wakeup

so for local wakeup INH needs to be enable when we are controlling the wake pin.

If I select  TCAN1043A-Q1 for my requirement , will it be sufficient. If not please suggest any device for my requirement.

Regards

Tendulkar Selvam

  • 0
    TI__Guru 53575 points

    Hi Tendulkar,

    Thanks for bringing your question to E2E.

    I don't think I fully understand the requirement here. I understand that you expect the transceiver to respond to a 500ms low pulse on the WAKE pin by driving the INH signal high. Though I think there is some confusion regarding "INH needs to be disabled/not activated in standby mode".

    The TCAN1043A will drive the INH signal high (Vsup level) whenever it is in an active mode - normal, silent, and standby. The INH signal is only ever turned off (high impedance) when the transceiver is in sleep mode. While the transceiver is in sleep mode, it will be monitoring both the WAKE pin and the CAN bus for a valid wake condition. The WAKE pin is a bi-directional edge trigger meaning a low-to-high or high-to-low transition will both be recognized as valid wake conditions. The wake via CAN is sensitive to the standard wake up pattern (WUP) used for remote CAN wake.  When the transceiver receiver one of these valid wake conditions, it will transition from sleep mode to standby mode and the INH signal will be driven high. 

    Is this behavior consistent with the requirements for your system? 

    Regards, 
    Eric Schott 

  • 0 in reply to Eric Schott1
    Intellectual 255 points

    HI Eric,

    Yes this is my requirement - The transceiver to respond to a 500ms low pulse on the WAKE pin by driving the INH signal high .i.e on the first power on.

    INH pin has to enable the frontend filter (VBAT input EMI filter/ Ideal Diode filter) after WAKE pin detecting the 500mS low pulse.

    Do you have any transceiver with that requirement. ??

    Regards

    Tendulkar Selvam

  • 0 in reply to Tendulkar Selvam
    TI__Guru 53575 points

    Hi Tendulkar,

    Yes, it seems like the TCAN1043A will meet your requirements. My above description looks to be compatible with the desired sequence you describe.

    Let me know if you have any more questions. 

    Regards, 
    Eric Schott