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Auto-calibration of the PIC12F6XX Internal RC Oscillator to ± 1%

From Microchip Technology, Inc.
 

 
This application note describes a technique used to calibrate the internal oscillator on the PIC12F6XX devices. This technique allows the internal oscillator to be calibrated within ± 1%. See the test circuit shown in Figure 1. This application note is useful in the following applications. 1. High volume production environment. 2. Battery applications using on-board calibration to recalibrate the internal RC oscillator as the battery voltage drops. 3. Applications that are exposed to a varying voltage and temperature range could have intelligent on-board recalibration.
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Topics of Interest
This application note describes a fast and accurate method to calibrate the internal RC oscillator. It offers an easily adaptable calibration firmware source code, which can be used with any AVR®... (Read More)
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