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TCAN4550: TCAN4550 RST/SCLK/SDI/SDO/nCS questions

Part Number: TCAN4550
Other Parts Discussed in Thread: , ISO7761

Hi Support team 

due to MUC is no CAN FD interface, my customer would like use TCAN4550 + ISO communication to achieve CAN FD interface 

however, few questions need your advice  

  1. If use CAN with 1Mbps, how to set the SPI baud rate? Crystal be still 40MHz?
  2. Need your help to advise 6 channels isolator to match baud rate of item1.
  3. The register map seems to be complicated to set, can you provide a simple way to do? (or what is the key register that must be set)
  4. the following structure works

thanks a lot 

  • Red,

    I'm glad to hear that your customer is looking to use the TCAN4550-Q1. I'd highly recommend the customer reading through the TCAN4550-Q1 Software User's Guide  and looking into the sample code available to get them started. Both of these can be found in the TCAN4550-Q1 product folder on To answer your questions:

    1. The CAN data rate is configured through SPI registers by setting the bit divisions up correctly, and yes 40MHz clock can be used. A 20MHz clock can be used for 1Mbps data rate, but for future proofing (in case the customer wants to increase the data rate in future applications), using a 40MHz clock will be a good choice. The SPI baud rate works up to 18MHz, and doesn't need to be configured.
    2. The ISO7761 should work for this, the six channels are the six channels you circled in red, correct?
    3. Check out the starter code and software user's guide I mentioned at the beginning of my post. This should help get the customer started.
    4. Not sure what is being asked here. Can you clarify?

    Please let me know if you have any other questions as well.