STM32ADC采样精度提高办法_stm32提高adc精度

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August 2012 Doc ID 022945 Rev 3 1/19

AN4073

Application note

How to improve ADC accuracy when using STM32F2xx,

STM32F40x and STM32F41x microcontrollers

Introduction

The purpose of this application note is to show how to improve the accuracy of A/D

conversions for applications using the STM32F20x / STM32F21x (revZ, revY, revX) and

STM32F40x/STM32F41x (revZ) microcontrollers.

It also explains the firmware methodology, which can be applied to reduce the ADC error. A

reference application is shown with implementation of firmware filtering techniques (using

averaging algorithms) to minimize the ADC errors.

The document also gives some general tips on writing firmware for better ADC accuracy.

Please note that the data provided with this application note is for reference only, measured

in a lab under typical conditions (unless specified otherwise) and not tested in production.

Table 1 lists the microcontrollers concerned by this application note.

Table 1. Applicable products

Type Applicable products

Microcontrollers

STM32F20x / STM32F21x (revZ, revY, revX) and

STM32F40x/STM32F41x (revZ) microcontrollers

www.st.com

Contents AN4073

2/19 Doc ID 022945 Rev 3

Contents

1 Overview of parameters impacting the ADC accuracy . . . . . . . . . . . . . 3

2 Firmware techniques for improving the conversion accuracy . . . . . . . 4

2.1 Averaging . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

2.1.1 Averaging of N ADC samples . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

2.1.2 Averaging of N-X ADC samples . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

2.2 Additional recommendation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

3 Practical measurements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

3.1 Measurement conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

3.1.1 Hardware setup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

3.1.2 Firmware setup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

3.2 Results . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

3.2.1 ADC measurements when ART is ON . . . . . . . . . . . . . . . . . . . . . . . . . . 10

3.2.2 ADC measurements when ART is OFF . . . . . . . . . . . . . . . . . . . . . . . . . 10

3.2.3 ADC measurements when (Data+Instruction) cache ON + prefetch OFF

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

3.3 Timing considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

3.4 Conclusion . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

Appendix A Averaging of N ADC samples: source code . . . . . . . . . . . . . . . . . . 15

Appendix B Averaging of N-X ADC samples: source code . . . . . . . . . . . . . . . . 16

Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

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