CD00001237 datasheet(53/105 Pages) STMICROELECTRONICS

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9.3 A/D CONVERTER (ADC)

9.3.1 Introduction

The on-chip Analog to Digital Converter (ADC) pe-

ripheral is a 8-bit, successive approximation con-

verter. This peripheral has multiplexed analog in-

put channels (refer to device pin out description)

that allow the peripheral to convert the analog volt-

age levels from different sources.

The result of the conversion is stored in a 8-bit

Data Register. The A/D converter is controlled

through a Control Register.

9.3.2 Main Features

■ 8-bit conversion

■ Multiplexed analog input channels

■ Linear successive approximation

■ Data register (DR) which contains the results

■ End of Conversion flag

■ On/Off bit (to reduce consumption)

■ Typical conversion time 70 µs (with an 8 MHz

crystal)

The block diagram is shown in Figure 34.

Figure 34. ADC Block Diagram

OSC

EAI EOC STA PDS

ADCR

AIN0

AIN1

ANALOG TO DIGITAL

CONVERTER

AINx

PORT

MUX

ADR2 ADR1

ADR3

ADR7 ADR6 ADR5 ADR4

ADR0

ADR

DIV 12

fADC

fINT

DDRx

ORx

DRx

I/O PORT

OFF

CR3

CR1

CR0

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