ST72561AR7-Auto datasheet(259/324 Pages) STMICROELECTRONICS

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ST72561-Auto

10-bit A/D converter (ADC)

Doc ID 12370 Rev 8

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10-bit A/D converter (ADC)

18.1

Introduction

The on-chip Analog to Digital Converter (ADC) peripheral is a 10-bit, successive

approximation converter with internal sample and hold circuitry. This peripheral has up to 16

multiplexed analog input channels (refer to device pin out description) that allow the

peripheral to convert the analog voltage levels from up to 16 different sources.

The result of the conversion is stored in a 10-bit data register. The A/D converter is

controlled through a control/status register.

18.2

Main features

●

10-bit conversion

●

Up to 16 channels with multiplexed input

●

Linear successive approximation

●

Data register (DR) which contains the results

●

Conversion complete status flag

●

On/off bit (to reduce consumption)

The block diagram is shown in Figure 117.

18.3

Functional description

18.3.1

Digital A/D conversion result

The conversion is monotonic, meaning that the result never decreases if the analog input

does not and never increases if the analog input does not.

If the input voltage (VAIN) is greater than VDDA (high-level voltage reference) then the

conversion result is FFh in the ADCDRH register and 03h in the ADCDRL register (without

overflow indication).

If the input voltage (VAIN) is lower than VSSA (low-level voltage reference) then the

conversion result in the ADCDRH and ADCDRL registers is 00 00h.

The A/D converter is linear and the digital result of the conversion is stored in the ADCDRH

and ADCDRL registers. The accuracy of the conversion is described in the electrical

characteristics section.

RAIN is the maximum recommended impedance for an analog input signal. If the impedance

is too high, this will result in a loss of accuracy due to leakage and sampling not being

completed in the allotted time.

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