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TCAN1044A-Q1: Supply Current ICC

Akihiro Hirata
Expert 6230 points
Part Number: TCAN1044A-Q1

Hi team,

I have 2 questions on TCAN1044A-Q1 ICC.

1: There is a spec of the supply current during dominant.

   If 2 CAN PHY connected to the same CAN bus is dominant state at the same time, how about the supply current?

   I guess ICC in this case is close to half of the specification, but if you have any data or any method to calculate, it is helpful.

2: Regarding the "Dominant with Bus Fault" shown in below, The test condition is CANH = CANL = ±25 V.

    What is the Bus Fault? Is this CAN bus short to battery and short to GND?

    And what is the case of the CANH=CANL=-25V? Is it CAN Bus short to GND case and 2 GND voltage difference is very big case?

I appreciate your support.

Regards,

Hirata

  • 0
    TI__Guru 74292 points

    Hirata-san,

    1. The current consumption regardless of how many nodes on the bus are driving dominant. It was still be close to 40mA typical per transceiver.

    2. Bus fault is the CAN bus shorted to battery, reverse polarity relative to the CAN pin; CANH shorted to negative battery, CANL shorted to positive battery. And then the transceiver is driving dominant. When the battery voltage is negative, the assumption is that there has been a voltage polarity switch. The case where CANH is shorted to -25V is a case where the battery voltage would have to switch during a dominant transmission and the whole system would need to still remain powered on, which would be difficult if VBAT is negative voltage.

    Please let me know if you have any other questions.

    Regards,

    Eric Hackett