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TCAN1051V-Q1: Internal function to stop communication

Hidekazu Someno
Expert 5130 points
Part Number: TCAN1051V-Q1
Other Parts Discussed in Thread: TCAN1051, TCAN1051H

Hi Team;

I just received the questions about the internal functions(protections) to stop the CAN communication in TCAN1051V-Q1 from my customer.

Please tell me the following items.

・ What kind of protection function does TCAN1051VDRQ1 have?
・ Are there any protection functions that stop communication?  
・ If there is something to stop communication, please tell me the condition to trigger it and condition to let the communication recover.
・ If you have any material showing them, please send it.

Regards,

H.Someno

  • 0
    TI__Guru 68302 points

    Hidekazu,

    There are several fault protection features integrated into the TCAN1051:

    • Integrated ESD protection up to IEC standards
    • Bus fault protection +/-58V for TCAN1051 and TCAN1051V, and +/- 70V for the TCAN1051H
    • Undervoltage protection on VCC and VIO (if applicable)
    • Thermal Shutdown when the devices surpasses 150C
    • Dominant timeout function

    The protection features that stop communication are undervoltage protection, thermal shutdown, and dominant timeout.

    • When there is an undervoltage detected on VCC and/or VIO, the device goes into a protected mode where the bus pins (CANH and CANL) go into a high-impedance state, and the bus driver and receiver are disabled. Once VCC and/or VIO recover to acceptable levels, the device returns back to operational mode.
    • When the junction temperature of the device surpasses 150C, the device disables the bus driver, stopping the CAN transceiver from transmitting any communication to the bus. The bus receiver remains functional however, and once the junction temperatures cools down to below the TSD falling threshold, the bus transmitter will be operation again.
    • Dominant timeout is a feature that disables the bus driver if TXD and/or the bus pins are held in the dominant state for longer than ~2ms (this can vary slightly from device to device, the minimum time is 1.2ms, and the maximum is 3.8ms). This is so the bus driver isn't driving a voltage indefinitely in the case of a fault. Once a recessive level is seen by TXD and/or the CAN bus, the bus driver will be re-enabled and the device operate normally again.

    You can find all of this information in the TCAN1051V-Q1 datasheet. Please let me know if you have any other questions.

    Regards,