PIC12F1822-ISLASHMF datasheet(133/398 Pages) MICROCHIP

133 / 398 page

 2010 Microchip Technology Inc.

Preliminary

DS41413A-page 133

PIC12F/LF1822/16F/LF1823

15.0 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 (ADRESH:ADRESL register pair).

Figure 15-1 shows the block diagram of the ADC.

The ADC voltage reference is software selectable to be

either internally generated or externally supplied.

The ADC can generate an interrupt upon completion of

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

device from Sleep.

FIGURE 15-1:

ADC BLOCK DIAGRAM

Note 1: When ADON = 0, all multiplexer inputs are disconnected.

2: Not available on PIC12F/LF1822.

DAC

VDD

VREF+

ADPREF = 10

ADPREF = 00

ADPREF = 11

FVR Buffer1

ADON(1)

GO/DONE

VSS

ADC

00000

00001

00010

00011

00100

00101

00111

00110

11110

CHS<4:0>

AN0

AN1

AN2

AN4(2)

AN5(2)

AN6(2)

AN7(2)

AN3

11111

ADRESH ADRESL

ADFM

0 = Left Justify

1 = Right Justify

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