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TCAN1044V-Q1: maximum output current of CANH and CANL

Bengi Long
Intellectual 2190 points

Part Number: TCAN1044V-Q1

Tool/software:

Hi team,

My customer's application is automotive lighting. In order to prevent the production line equipment pulse voltage and current is too large which could damage the external lamp, so they need to make clear in the drawings of the external lamp body connector pin pulse voltage and pulse current limit value. As CAN interface is connected to the LDM, so they want to know the max pulse current of CANH and CANL. Could you tell me the max pulse current of CANH and CANL? I only see from datasheet that the short-circuit steady-state output current in dominant and recessive state value below:

Can this be regarded as the max current in CANH and CANL?

BR,

Bengi

  • 0
    TI__Guru 74252 points

    Bengi,

    Yes, in the exact conditions shown in the datasheet, the current that would be delivered in a short to battery fault condition is listed in the screenshot you provided. Keep in mind that these conditions are also when the CAN bus signal is dominant, thus it will only last milliseconds at most before the dominant timeout feature is enabled is stops the dominant pulse. Once the dominant is no longer there, if there is a short to battery condition, the current consumption would be closer to 5mA. 

    It's important to note that current flows out of the transceiver on CANH and back into the CAN transceiver on CANL through the load (termination) resistance. How exactly is the LDM connected?

    Regards,

    Eric Hackett