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TCAN1051HG-Q1: CANH and CANL are communicating about the issue of short circuit in the power supply burning the terminal resistor

ian wu
Intellectual 775 points
Part Number: TCAN1051HG-Q1

Tool/software:

hi Expert,

Currently, when the CANL0 pin of the TCAN1051HGVDRQ1 we are using is short-circuited to the positive 48V of the power supply, the terminal resistor burns out.

Please help analyze whether there will be a circuit between CANH and CANL, causing the terminal resistor to burn out. The circuit diagram is shown as follows.

  • 0
    TI__Guru 50786 points

    Hi Ian,

    When short to battery occurs within the Ios specified conditions, current observed on the resistors will be limited to Ios of 100 mA max.

    Hence resistor sees 100 mA * 68 ohms i.e., 6.8 V for each. Therefore 6.8 V * 100 mA as 0.68 W.

    Furthermore, when short to battery occurs, the controller receives an error after driving TXD and do not receive RXD correctly due to the fault, and would eventually halt driving TXD. Hence, a bus off state further minimizing current draw. If thermal shutdown occurs, the device will be disabled, further protecting the IC and external components as an additional feature, thanks.

    Best Regards,

    Michael.