ST7232A datasheet(103/157 Pages) STMICROELECTRONICS

部件名	ST7232A

功能描述	8-BIT MICROCONTROLLER WITH 8K FLASH/ROM, ADC, 4 TIMERS, SPI, SCI INTERFACE

PDF	157 Pages

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制造商	STMICROELECTRONICS [STMicroelectronics]

网页	http://www.st.com

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ST7232A

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10.6 10-BIT A/D CONVERTER (ADC)

10.6.1 Introduction

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

ripheral is a 10-bit, successive approximation con-

verter 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.

10.6.2 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 55.

Figure 55. 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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