ST7LITE20 datasheet(81/131 Pages) STMICROELECTRONICS

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11.5 10-BIT A/D CONVERTER (ADC)

11.5.1 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 7 multiplexed analog input

channels (refer to device pin out description) that

allow the peripheral to convert the analog voltage

levels from up to 7 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.

11.5.2 Main Features

10-bit conversion

Up to 7 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 49.

11.5.3 Functional Description

11.5.3.1 Analog Power Supply

VDDA and VSSA are the high and low level refer-

ence voltage pins. In some devices (refer to device

pin out description) they are internally connected

to the VDD and VSS pins.

Conversion accuracy may therefore be impacted

by voltage drops and noise in the event of heavily

loaded or badly decoupled power supply lines.

Figure 49. ADC Block Diagram

CH2

CH1

EOC SPEED ADON

CH0

ADCCSR

AIN0

AIN1

ANALOG TO DIGITAL

CONVERTER

AINx

ANALOG

MUX

ADCDRH

ADCDRL

AMP

SLOW

AMP

RADC

CADC

HOLD CONTROL

x 1 or

x 8

AMPSEL

bit

SEL

fADC

fCPU

DIV 2

DIV 4

SLOW

bit

CAL

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