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AN1711 Datasheet(PDF) 2 Page - STMicroelectronics

Part # AN1711
Description  SOFTWARE TECHNIQUES FOR COMPENSATING ST7 ADC ERRORS
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

AN1711 Datasheet(HTML) 2 Page - STMicroelectronics

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Table of Contents
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1 GENERAL SOFTWARE CONSIDERATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
1.1 CHECKING FOR FADC (MAX) SUPPORTED BY THE DEVICE . . . . . . . . . . . . 4
1.2 SELECTING CONVERSION CHANNEL (AND STARTING CONVERSION) . . . 5
1.3 POLLING FOR END OF CONVERSION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
1.4 ADC CONVERSION RESULT FORMAT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
1.5 READING THE ADC CONVERSION RESULTS . . . . . . . . . . . . . . . . . . . . . . . . . 6
1.6 ENTERING HALT MODE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
1.7 USING A TIMER TO MAKE PERIODIC CONVERSIONS . . . . . . . . . . . . . . . . . . 6
1.8 USING A 10-BIT ADC AS AN 8-BIT ADC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
1.9 COMBINED REGISTER FOR CONTROL BITS AND LSB OF CONVERSION RE-
SULT
7
1.10ZOOMING TO LOW VOLTAGE SIGNALS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
2 SOFTWARE TECHNIQUES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
2.1 AVERAGING TECHNIQUE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
2.2 AVERAGING BY QUEUE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
2.3 HISTOGRAM TECHNIQUE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
2.4 NOISE FILTERING ALGORITHM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
3 REDUCING SYSTEM NOISE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
3.1 INSERT “NOP” WHILE CHECKING FOR EOC . . . . . . . . . . . . . . . . . . . . . . . . 19
3.2 USING SLOW MODE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
3.3 USING WAIT MODE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
3.4 EXECUTING CODE FROM RAM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
4 CALIBRATING THE ADC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
4.1 CALIBRATION ISSUES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
4.2 CALIBRATION METHODS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
4.2.1 Use accurate voltage reference . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24


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