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PSoC5LP CAN - Is the 24MHz PLL accurate enough? | Cypress Semiconductor

PSoC5LP CAN - Is the 24MHz PLL accurate enough?

Summary: 3 Replies, Latest post by akohlsmith on 30 Apr 2015 08:27 PM PDT
Verified Answers: 0
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user_463311141's picture
30 posts

In the "Getting Started with CAN" application note it says, "This requires the use of highly accurate oscillator for baud rates greater than 125 Kbps. The CAN protocol specifies that the clock accuracy must be less than or equal to 0.5%." Is the 24MHz PLL accurate enough over the entire temperature range to have reliable CAN communication at 250 Kbps?

user_1377889's picture
9249 posts

Welcome in the forum!

No, it is not accurate enough. I would suggest you to use an x-tal for clock generation. the internal oscillator has @ 3MHz a precision of 1% which is not good enough for CAN specs.




user_14586677's picture
7646 posts

Specs for CAN -


Regards, Dana.

user_193124556's picture
128 posts

 @bob - however if you're using the PLL and USB, the clock accuracy is increased considerably. While my own testing is *far* from thorough, I seem to have no issues with CAN when using USB as well.

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