PIC16F1825-ESLASHML datasheet(177/420 Pages) MICROCHIP

177 / 420 page

 2010 Microchip Technology Inc.

Preliminary

DS41440A-page 177

PIC16F/LF1825/1829

19.0 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.

Comparators are very useful mixed signal building

blocks because they provide analog functionality

independent of 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

19.1

Comparator Overview

A single comparator is shown in Figure 19-1 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 19-1:

SINGLE COMPARATOR

FIGURE 19-2:

COMPARATOR MODULE SIMPLIFIED BLOCK DIAGRAM

–

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.

Note

When CxON = 0, the Comparator will produce a ‘0’ at the output.

When CxON = 0, all multiplexer inputs are disconnected.

Output of comparator can be frozen during debugging.

MUX

Cx(3)

CxON(1)

CxNCH<1:0>

CXPCH<1:0>

C12IN1-

C12IN2-

C12IN3-

CXIN+

MUX

CxVN

CxVP

CXOUT

To ECCP PWM Logic

CXPOL

MCXOUT

Set CxIF

CXSYNC

CXOE

CXOUT

SYNCCXOUT

DAC

FVR Buffer2

C12IN0-

CxSP

CxHYS

det

Interrupt

det

Interrupt

CxINTN

CxINTP

To Data Bus

VSS

TRIS bit

CxON

(2)

(from Timer1)

T1CLK

To Timer1 or SR Latch

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