ST10F296 datasheet(179/346 Pages) STMICROELECTRONICS

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ST10F296E

Analog-to-digital converter (ADC)

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Note:

Total conversion time is compatible with the formula valid for the ST10F280, but, the

meaning of the bit fields ADCTC and ADSTC is not. The minimum conversion time is

388 TCL, which at 40 MHz CPU frequency corresponds to 4.85 µs (see the ST10F280

datasheet). ST10F296E devices can target a maximum CPU frequency of 64 MHz. This

means that the minimum conversion time is around 3 µs.

14.2

Calibration

A full calibration sequence is performed after a reset. It lasts 40.629 ± 1 CPU clock cycles.

During this time, the busy flag, ADBSY, is set to indicate the operation. It compensates the

capacitance mismatch, so, the calibration procedure does not need to be updated during

normal operation.

No conversion can be performed during the calibration time. The ADBSY bit must be polled

to verify when calibration is over, and the module can start a convertion.

At the end of the calibration, both the ADCIR and ADEIR flags are set, because the

calibration process repeatedly writes spurious conversion results inside the ADDAT register.

Consequently, before starting a conversion, the application performs a dummy read of the

ADDAT register and clears the two flags in the ADC initialization routine.

Note:

If the ADDAT register is not read before starting the first conversion, and if a ‘wait for read

mode’ is entered (by setting the ADWR bit), the ADC is stacked waiting for the register

ADDAT read. This is because the result of the current conversion cannot be immediately

written inside the ADDAT register which contains the results of the calibration.

Table 116.

ADC programming at fCPU = 64 MHz

ADCTC

ADSTC

Sample

Comparison

Extra

Total convertion

0.94 µs

1.88 µs

0.22 µs

3.03 µs

1.09 µs

2.19 µs

0.13 µs

3.41 µs

1.56 µs

2.19 µs

0.41 µs

4.16 µs

3.13 µs

2.19 µs

0.34 µs

5.66 µs

1.88 µs

3.75 µs

0.41 µs

6.03 µs

2.19 µs

4.38 µs

0.22 µs

6.78 µs

3.13 µs

4.38 µs

0.78 µs

8.28 µs

6.25 µs

4.38 µs

0.41 µs

11.28 µs

3.75 µs

7.50 µs

0.78 µs

12.03 µs

4.38 µs

8.75 µs

0.41 µs

13.53 µs

6.25 µs

8.75 µs

1.53 µs

16.53 µs

12.5 µs

8.75 µs

1.28 µs

22.53 µs

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