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Hercules Development Kit RM48: CAN1 not working

42Bastian
Expert 1430 points
Hi, anyone got an HDK with the old name Argoboard and CAN1 working. I checked the H/L lines an both give 0V. Could it be that the driver chip is damaged? How fragile are those CAN drivers. The second CAN is working correctly and if I compare the tensions on the pins between both drivers they are identical. Cheers, 42Bastian
  • 0
    TI__Guru**** 196246 points

    Hi Bastian，

    Can you please check the Vio (pin 5), Vcc (pin 3), and the STB pin (pin 8) of CAN transceiver (U21)? The U21 is located at the right side of CAN1 connector, and the pin 1 is the right-bottom pin. The value for those 3 pins should be 3.3V, 5V, and 0.

    The H and L should be around 2.5V.

    Regards,

    QJ

  • 0 in reply to QJ Wang
    Expert 1430 points
    Hi, I was sure I compared voltage on all pins from CAN1 driver with the ones one the CAN2 driver.
    But doing so again, STB is at 3.3V so I guess the transceiver is in not active. I checked, and R211 is not fitted but R212 seems to be damaged. Thanks for the hint.