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10-bit A/D converter (ADC)

ST72321xx-Auto

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Doc ID 13829 Rev 1

10-bit A/D converter (ADC)

17.1

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.

17.2

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 70.

Figure 70.

ADC block diagram

CH2

CH1

EOC

SPEED ADON

CH0

ADCCSR

AIN0

AIN1

ANALOG TO DIGITAL

CONVERTER

AINx

ANALOG

MUX

ADCDRH

DIV 4

fADC

fCPU

ADCDRL

CH3

DIV 2

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