ST72101 datasheet(63/85 Pages) STMICROELECTRONICS

Teilenummer	ST72101

Bauteilbeschribung	8-BIT MCU WITH 4 TO 8K ROM/OTP/EPROM, 256 BYTES RAM, ADC, WDG, SPI AND 1 OR 2 TIMERS

PDF	85 Pages

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Hersteller	STMICROELECTRONICS [STMicroelectronics]

Direct Link	http://www.st.com

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ST72101/ST72212/ST72213

5.5 8-BIT A/D CONVERTER (ADC)

5.5.1 Introduction

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

ripheral is a 8-bit, successive approximation con-

verter with internal sample and hold circuitry. This

peripheral has up to 8 multiplexed analog input

channels (refer to device pin out description) that

allow the peripheral to convert the analog voltage

levels from up to 8 different sources.

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

Data Register. The A/D converter is controlled

through a Control/Status Register.

5.5.2 Main Features

8-bit conversion

Up to 8 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 1.

Figure 39. ADC Block Diagram

SAMPLE

ANALOG

MUX

AIN0

AIN1

AIN2

AIN3

AIN4

AIN5

AIN6

AIN7

(Control Status Register) CSR

(Data Register) DR

HOLD

fCPU

ANALOG TO

DIGITAL

CONVERTER

COCO

0CH0

CH1

CH2

-ADON

AD7

AD4

AD0

AD1

AD2

AD3

AD6

AD5

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