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AN2822 Datasheet(PDF) 2 Page - STMicroelectronics

Part # AN2822
Description  STM8S and STM8A high speed internal oscillator calibration
Download  19 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

AN2822 Datasheet(HTML) 2 Page - STMicroelectronics

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Contents
AN2822
2/19
Doc ID 14983 Rev 2
Contents
1
High speed internal oscillator trimming . . . . . . . . . . . . . . . . . . . . . . . . . 5
1.1
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
1.2
Calibration principle . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
1.3
Calibration routine . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
1.4
Measurement of HSI pulses per calibration period . . . . . . . . . . . . . . . . . . 9
1.5
Timing of calibration period measurement . . . . . . . . . . . . . . . . . . . . . . . . 11
1.6
Uncertainty of calibrated HSI frequency . . . . . . . . . . . . . . . . . . . . . . . . . . 12
2
Power supply and calibration signal conditioning circuit . . . . . . . . . . 15
3
Conclusion . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
4
Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18


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