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Original question:

CCS/TCAN4550-Q1: TCAN4550 SPI Communication problem with TMS320F280040 (C2000).

TCAN4550-Q1: Problem in CAN communication due to shorting of CAN Line with 320 V AC supply.

Sanskar Verma
Prodigy 20 points
Part Number: TCAN4550-Q1
Other Parts Discussed in Thread: TCAN4550, STRIKE

Hi,

I was using a system consisting of 40 nodes and by mistake 320 V AC power line came in contact with the 24 V DC  supply which was connected to all the nodes. As a result all of my TCAN4550 IC's stopped communicating with each other but there were no signs of physical damage on them. (TVS diode was installed on each node and it got burnt ).

Can you explain this behavior?

  • 0
    TI__Genius 15345 points

    Hi Sanskar,

    Can you confirm that the TCAN4550's can still communicate with the MCU and on the CAN bus. It looks like the TVS diodes did their job and luckily they were included on the CAN bus.

    The purpose of the TVS diode is to short any voltage that crosses it's threshold to GND. This protects all the components between it and the CAN transceiver. It is not necessary for communication so you should still be able to use the CAN bus after replacing the TVS diodes. Each node needs to have it's own TVS diode. If there were some nodes without it they were likely damaged.

    Edit: Let me also add that a TVS diode is only meant to protect against a surge/strike. If the voltage was applied over too long a period of time then the it would have traveled down the CAN bus to the 4550 ground path and damaged those devices. The 4550's might look like they are not damaged but internally the GND trace will be damaged.

    Best,

    Chris