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CAN transceiver can wake up MCU

Polly Chung1
Intellectual 2110 points
Other Parts Discussed in Thread: TCAN1042-Q1, TCAN1043-Q1

Dear team,

My customer is seeking a CAN transceiver that is always listening CAN bus signal. If there are signal from CAN bus, then CAN transceiver can wake up their MCU. Do we have this kind of CAN transceiver solution? Thank you.

Regards,

Polly

  • 0
    TI__Guru 62920 points
    Hi Polly,

    Yes, we have a few different options for this. For example, the TCAN1042-Q1's standby mode can be used to keep the transceiver in a low-power state while it monitors the CAN bus for activity. When CAN activity is detected (using the ISO 11898 standard's definition of a wake-up pattern), the transceiver can signal it to the MCU by driving the RXD output low. The MCU could then transition the transceiver out of standby mode and into normal mode by toggling the STB pin.

    Some applications need to conserve current even further by entering a "sleep" mode in which the MCU and other circuitry are shut off until bus activity is detected by the transceiver. For these applications TCAN1043-Q1 is a good fit. This device can operate solely off of a battery voltage rail in a sleep mode, and once a wake-up pattern is detected the device can signal it to the rest of the system by driving the INH pin high. This INH output pin is often connected to the system's DC regulators as an "enable" control, meaning that all the regulators can be disabled in sleep mode and then enabled once the transceiver wakes up (without requiring MCU control). Note that this device also allows for detection of local wake-up requests (in addition to wake-up via the CAN bus) via a WAKE input pin.

    Please let me know if there is any other information I can provide on these devices.

    Regards,
    Max