AN1711 datasheet(35/40 Pages) STMICROELECTRONICS

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SOFTWARE TECHNIQUES FOR COMPENSATING ST7 ADC ERRORS

5 SOFTWARE

The software available with this application note is provided in C language. The software is

provided for guidance and you can use it directly or change it to meet your requirements. For

demonstration and easy usability, some parts of the code are repeated. For example, aver-

aging etc.) is tested on ST72F324 and ST72F521 but it can be used with other ST7 devices

also. The software covers the following techniques.

Table 3. General techniques for improving ADC accuracy

Table 4. Noise reduction techniques

Table 5. Calibration techniques

5.1 FILE PACKAGE

The package provided with this application note contains the workspace, make-files and the

source code.

You can include ADC_tech.c and ADC_tech.h in your workspace to use the ADC software

techniques.

No.

Software technique

Software available

Averaging

Yes

Averaging using queue implementation

Yes

Histogram technique

Yes

Noise filtering technique

Yes

No.

Noise Reduction technique

Software available

Using Slow mode

Yes

Inserting NOPs

Yes

3Using WFI mode

Yes

Executing code from RAM

Yes

No.

Calibration technique

Software available

Use of accurate voltage reference

Use of external DAC

Maintaining lookup table

Using Linear compensation

Zone compensation

Yes

Autocalibration of offset and gain errors

Yes

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