ST7FLCD1 datasheet(49/95 Pages) STMICROELECTRONICS

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ST7FLCD1

8-bit Analog-to-Digital Converter (ADC)

9.1

Introduction

The on-chip Analog to Digital Converter (ADC) peripheral is a 8-bit, successive approximation

converter with internal Sample and Hold circuitry. This peripheral has up to 4 multiplexed analog

input channels (refer to device pin out description) that allows the peripheral to convert the analog

voltage levels from up to 4 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.

9.2

Main Features

●

8-bit conversion

●

Up to 4 channels with multiplexed input

●

Linear successive approximation

●

Data register (DR) which contains the results

●

Conversion complete status flag

●

On/Off bit (to reduce power consumption)

9.3

Functional Description

The high and low level reference voltages are VDD and VSS, respectively. Consequently, conversion

accuracy is degraded by voltage drops and noise in the event of heavily loaded or badly decoupled

power supply lines.

Figure 27: ADC Block Diagram

Sample

Analog

Mux

AIN0

AIN1

AIN2

AIN3

COCO

CH0

CH1

ADON

(Control Status Register) CSR

AD7

AD0

AD1

AD2

AD3

AD6

AD5

(Data Register) DR

Hold

fCPU / 4

Analog to Digital

Converter

AD4

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