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TCAN1048AV-Q1: TCAN1048- STDBY Wake-Up Interrupt Routine

Mustafa Tarhan
Intellectual 1590 points
Part Number: TCAN1048AV-Q1


Hi

How is it possible to wake up 2x TCAN1048AVDMTRQ1 IC from STBY mode for the 4 can lines that our customer will use for CAN buses? How does the interrupt mechanism work? Can you provide information on this? Can you share power consumption values while in the stby position? 


As a matter of fact, our customer is constructing a structure like the following in the "body control module" projects on the CANside.

  1. 1 xTCAN1043ADRQ1 to create a wake-up option via CAN 
  2. 2x TCAN1048AVDMTRQ1 for 4x CAN line

Will be glad to get your support.

  • 0
    TI__Guru 53575 points

    Hi Mustafa,

    When a CAN transceiver is in its Standby mode, it disables the CAN driver and high-speed CAN receiver. Device that support wake over CAN via a wake up pattern (WUP) will have a low power receiver active while the device is in Standby mode. This receiver is capable of detecting a specific WUP that will be satisfied by any valid CAN frame. When the transceiver identifies CAN activity on the bus from this low power receiver, it can indicate the wake event to the microcontroller by driving the RXD signal low. See section 10.4.3.1 of the TCAN1048A datasheet for more information on this feature and timings for the WUP. 

    The supply currents for both the Vcc and Vio lines (Icc and Iio) are included in the parametric tables in Section 8.6 for both Normal and Standby mode. 

    While the CAN devices without INH can still support wake via CAN, they do require that a 5V supply be available during their Standby mode. They will also require the MCU to be active (may be in a low power state) and capable of monitoring the RXD pin for a low signal to indicate the wake event. 
    In contrast, devices such as TCAN1043A with an INH signal can operate off of the battery supply alone in Standby mode so the 5V and Vio rail may be disabled entirely so save power in the local node. The INH signal can be used to control these local rails so the MCU may be completely unpowered. 

    Let me know if you have any additional questions on any of these points. 

    Regards,
    Eric Schott