ST72P314J2T View Datasheet(PDF) - STMicroelectronics

Part Name

Description

MFG CO.

ST72P314J2T

8-BIT MCU WITH SINGLE VOLTAGE FLASH MEMORY, ADC, 16-BIT TIMERS, SPI, SCI INTERFACES

STMicroelectronics 

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ST72334J/N, ST72314J/N, ST72124J

6.7 8-BIT A/D CONVERTER (ADC)

6.7.1 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 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 8-bit

Data Register. The A/D converter is controlled

through a Control/Status Register.

6.7.2 Main Features

s 8-bit conversion

s Up to 16 channels with multiplexed input

s Linear successive approximation

s Data register (DR) which contains the results

s Conversion complete status flag

s On/off bit (to reduce consumption)

The block diagram is shown in Figure 56.

6.7.3 Functional Description

6.7.3.1 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 55. Recommended Ext. Connections

VDD

VAIN

RAIN

0.1pF

VDDA

VSSA

ST7

Px.x/AINx

Figure 56. ADC Block Diagram

fCPU

DIV 2

fADC

COCO 0 ADON 0 CH3 CH2 CH1 CH0 ADCCSR

4

AIN0

HOLD CONTROL

AIN1

RADC

ANALOG

MUX

AINx

CSAMPLE

ANALOG TO DIGITAL

CONVERTER

ADCDR D7 D6 D5 D4 D3 D2 D1 D0

95/125

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