AN2352 Datasheet, PDF (1/20 Pages) STMicroelectronics – PLL jitter effects on C-CAN modules of the ST10F27x

AN2352
Application note
PLL jitter effects on C-CAN modules of the ST10F27x
Introduction
PLL (Phase Locked Loop) is increasingly used in microcontrollers to achieve higher internal
clock frequencies. This improves performance while reducing overall noise. One drawback
in the use of PLL circuits is that they create a small but still measurable level of transient
phase shifts, or jitter. The aim of this note is to describe the effects of PLL jitter on the C-
CAN modules present in the devices of the family ST10F27x.
This document begins with a brief guide on configuring the bit time of the CAN protocol and
then goes on to cover the characteristics of the PLL as implemented in the ST10F27x. The
last section shows the results of the effect of the ST10F27x PLL on the C-CAN.
The information contained in this document is valid for the ST10F27x, ST10R27x,
ST10F25x and ST10F296 devices.
September 2013
Rev 2
1/20
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