Transcription of Crystal Oscillator Troubleshooting Guide
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Freescale Semiconductor AN3208. Rev. 0, 1/2006. Application Note Crystal Oscillator Troubleshooting Guide by: Sergio Garcia de Alba Garcin RTAC Americas 1 Overview 1. Table of Contents Overview .. 1. This document is a quick-reference Troubleshooting 2 Introduction .. 1. 3 Oscillator Configurations.. 2. Guide for solving Crystal Oscillator problems that might 4 Components in the Colpitts Configuration .. 3. be encountered when working with microcontrollers. 5 Components in the Pierce Configuration .. 3. 6 Crystal Overdriving .. 4. A practical explanation of the Pierce and Colpitts 7 Insufficient Loop Gain.
than the worst-case resistance specified for the crysta l. For example, for a good ma rgin of safety, it would be nice to have the circui t oscillate with at least tw ice the maximum specified cr ystal resistance. The size of the potentiometer required for the test will increase as the crystal frequency decreases (i.e., 1 kΩ for a
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