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TCAN4550-Q1: Timing Calculation

Muwei Zheng
Intellectual 1020 points
Part Number: TCAN4550-Q1

Hi team,

I have a question from customer about TCAN4550-Q1 timing:

Could you tell us the length of time(by calculation) when a CAN message received and nINT becomes Low in below cases? We want to compare the value with actual measurement.

- Case 1. DLC：8byte
- Case 2. DLC：48byte
- Case 3. DLC：64byte

Regards,

Muwei Zheng

  • 0
    TI__Mastermind 47895 points

    Hi Muwei,

    The interrupt generation occurs after the last bit of the CAN frame is received. Therefore, the difference in DLC will only increase the delay relative to the start of the CAN frame. Similarly, the data contents of the CAN frame may cause it to be longer or shorter based on the number of stuff bits that are generated. Therefore, there are still a considerable number of variables in this calculation. 

    From my own measurements, the delay between the ACK bit of the sent CAN frame and when nINT asserts is around 16us when operating at 500kbps arbitration rate. 

    Let me know if you have any more questions.

    Regards,
    Eric Schott