PIC16F688-I/ST View Datasheet(PDF) - Microchip Technology

Part Name

Description

Manufacturer

PIC16F688-I/ST

14-Pin Flash-Based, 8-Bit CMOS Microcontrollers with nanoWatt Technology

Microchip Technology 

8.0 ANALOG-TO-DIGITAL

CONVERTER (ADC) MODULE

The Analog-to-Digital Converter (ADC) allows

conversion of an analog input signal to a 10-bit binary

representation of that signal. This device uses analog

inputs, which are multiplexed into a single sample and

hold circuit. The output of the sample and hold is

connected to the input of the converter. The converter

generates a 10-bit binary result via successive

approximation and stores the conversion result into the

ADC result registers (ADRESL and ADRESH).

The ADC voltage reference is software selectable to

either VDD or a voltage applied to the external reference

pins.

The ADC can generate an interrupt upon completion of

a conversion. This interrupt can be used to wake-up the

device from Sleep.

Figure 8-1 shows the block diagram of the ADC.

FIGURE 8-1:

ADC BLOCK DIAGRAM

VDD

VREF

VCFG = 0

VCFG = 1

PIC16F688

RA0/AN0

RA1/AN1/VREF

RA2/AN2

RA4/AN3

RC0/AN4

RC1/AN5

RC2/AN6

RC3/AN7

000

001

010

011

100

101

110

111

CHS

A/D

GO/DONE

ADON

VSS

10

ADFM

0 = Left Justify

1 = Right Justify

10

ADRESH ADRESL

© 2007 Microchip Technology Inc.

DS41203D-page 65

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