41594B datasheet(125/372 Pages) MICROCHIP

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 2011-2012 Microchip Technology Inc.

Preliminary

DS41594B-page 125

PIC12LF1840T48A

16.0 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 16-1 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 16-1:

ADC BLOCK DIAGRAM

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

DAC

VDD

VREF

ADPREF = 10

ADPREF = 00

ADPREF = 11

FVR Buffer1

ADON(1)

GO/DONE

VSS

ADC

00000

00001

00010

00011

11110

CHS<4:0>

AN0

AN1

AN2

AN3

11111

ADRESH ADRESL

ADFM

0 = Left Justify

1 = Right Justify

Temp Indicator

11101

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