PIC18F23K22-ESLASHML datasheet(305/496 Pages) MICROCHIP

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 2010 Microchip Technology Inc.

Preliminary

DS41412C-page 305

PIC18(L)F2X/4XK22

18.0 COMPARATOR MODULE

Comparators are used to interface analog circuits to a

digital circuit by comparing two analog voltages and

providing a digital indication of their relative magnitudes.

The comparators are very useful mixed signal building

blocks because they provide analog functionality

independent of the program execution. The analog

comparator module includes the following features:

• Independent comparator control

• Programmable input selection

• Comparator output is available internally/externally

• Programmable output polarity

• Interrupt-on-change

• Wake-up from Sleep

• Programmable Speed/Power optimization

•PWM shutdown

• Programmable and fixed voltage reference

• Selectable Hysteresis

18.1

Comparator Overview

A single comparator is shown in Figure 18-1 along with

the relationship between the analog input levels and

the digital output. When the analog voltage at VIN+ is

less than the analog voltage at VIN-, the output of the

comparator is a digital low level. When the analog

voltage at VIN+ is greater than the analog voltage at

VIN-, the output of the comparator is a digital high level.

FIGURE 18-1:

SINGLE COMPARATOR

–

VIN+

VIN-

Output

VIN+

VIN-

Note:

The black areas of the output of the

comparator represents the uncertainty

due to input offsets and response time.

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