PIC16F631-ESLASHML datasheet(109/294 Pages) MICROCHIP

109 / 294 page

DS41262D-page 107

PIC16F631/677/685/687/689/690

9.0

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 9-1 shows the block diagram of the ADC.

FIGURE 9-1:

ADC BLOCK DIAGRAM

Note:

The ADC module applies to PIC16F677/

PIC16F685/PIC16F687/PIC16F689/

PIC16F690 devices only.

ADC

VDD

VREF

ADON

GO/DONE

VCFG = 1

VCFG = 0

CHS

VSS

RA0/AN0/C1IN+/ICSPDAT/ULPWU

RA1/AN1/C12IN0-/VREF/ICSPCLK

RA2/AN2/T0CKI/INT/C1OUT

RA4/AN3/T1G/OSC2/CLKOUT

RC0/AN4/C2IN+

RC1/AN5/C12IN1-

RC2/AN6/C12IN2-/P1D(1)

RC3/AN7/C12IN3-/P1C(1)

RC6/AN8/SS(2)

RC7/AN9/SDO(2)

RB4/AN10/SDI/SDA(2)

RB5/AN11/RX/DT(2)

CVREF

VP6 Reference

Note

P1C and P1D available on PIC16F685/PIC16F690 only.

SS, SDO, SDA, RX and DT available on PIC16F677/PIC16F687/PIC16F689/PIC16F690 only.

ADC module applies to the PIC16F677/PIC16F685/PIC16F687/PIC16F689/PIC16F690 devices only.

ADRESH

ADRESL

ADFM

= Left Justify

= Right Justify

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