2 Replies Latest reply on May 27, 2014 10:44 AM by user_193124556

    PSoC5LP crystal required for CAN even if using USB IMO calibration?

    user_193124556

      I'm developing a USB-CAN bridge using the PSoC5LP. I can see from http://www.cypress.com/?app=forum&id=2233&rID=87297 and also from http://www.cypress.com/?id=4&rID=58952 that the PSoC5LP does not require an external crystal for USB communications, unlike the PSoC5.

         

       

         

      The TRM states that when using USB with the 5LP the IMO clock frequency spec is +/- 0.25%. This is up from the (best case) +/- 1% for IMO at 3MHz and +/- 4% at 24MHz when not using USB.

         

       

         

      My question is whether the +/- 0.25% frequency accuracy is good enough for reliable CAN communications, or if I still require an external crystal to reliably communicate with CAN.