ST7PLITE39F2U6TR View Datasheet(PDF) - STMicroelectronics

Part Name

Description

Manufacturer

ST7PLITE39F2U6TR

8-bit MCU with single voltage Flash, data EEPROM, ADC, timers, SPI, LINSCI™

STMicroelectronics 

ST7LITE3xF2

11.6 10-BIT A/D CONVERTER (ADC)

11.6.1 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 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.

11.6.2 Main Features

■ 10-bit conversion

■ Up to 7 channels with multiplexed input

■ Linear successive approximation

Figure 66. ADC Block Diagram

■ Data register (DR) which contains the results

■ Conversion complete status flag

■ On/off bit (to reduce consumption)

The block diagram is shown in Figure 66.

11.6.3 Functional Description

11.6.3.1 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.

fCPU

DIV 2

0

1

DIV 4

1

0

SLOW

bit

fADC

EOC SPEED ADON 0

0 CH2 CH1 CH0 ADCCSR

3

AIN0

AIN1

AINx

ANALOG

MUX

RADC

HOLD CONTROL

CADC

ANALOG TO DIGITAL

CONVERTER

ADCDRH

D9 D8 D7 D6 D5 D4 D3 D2

ADCDRL

00

0

0 SLOW 0 D1 D0

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