S32K116 CAN Clock Tolerance

Sid_Zhou — Tue, 12 May 2026 03:27:18 GMT

The datasheet of S32K116 motioned clock tolerance is 48M +/- 1%. But one of our customers requires 0.5% tolerance on CAN clock.
I have seen similar discussion recommending external oscillator:
https://community.nxp.com/t5/S32K/CAN-FD-clocked-by-FIRC/m-p/879378#M4033

However, we prefer not to use external oscillator. and i am wondering
-- if there is any calibration or Trim we can apply one of these internal Clock and eventually achieve 0.5% tolerance on CAN?
-- if there is any variant of S32K116 with better/custom factory trim and achieve 0.5% tolerance?

Re: S32K116 CAN Clock Tolerance

PetrS — Tue, 12 May 2026 07:14:13 GMT

Hi,

On S32K116, CAN clock accuracy of ±0.5% cannot be guaranteed using internal oscillators alone. The internal FIRC is specified at ±1% over voltage and temperature, and no runtime calibration or factory trim variant exists to improve this. To meet ±0.5% reliably and compliantly, an external oscillator or crystal via SOSC is required, to be used as CAN PE clock.

BR, Petr

S32K中的主题 S32K116 CAN Clock Tolerance

S32K116 CAN Clock Tolerance

Re: S32K116 CAN Clock Tolerance