PIC12F683-ESLASHMDQTP datasheet(53/176 Pages) MICROCHIP

53 / 176 page

DS41211D-page 51

PIC12F683

8.0

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:

• Multiple comparator configurations

• Comparator output is available internally/externally

• Programmable output polarity

• Interrupt-on-change

• Wake-up from Sleep

• Timer1 gate (count enable)

• Output synchronization to Timer1 clock input

• Programmable voltage reference

8.1

Comparator Overview

The comparator is shown in Figure 8-1 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 8-1:

SINGLE COMPARATOR

FIGURE 8-2:

COMPARATOR OUTPUT 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.

CMSYNC

To COUT pin

RD CMCON0

Set CMIF bit

Q3*RD CMCON0

Reset

To Data Bus

CINV

Timer1

clock source(1)

To Timer1 Gate

Note 1:

Comparator output is latched on falling edge of Timer1 clock source.

Q1 and Q3 are phases of the four-phase system clock (FOSC).

Q1 is held high during Sleep mode.

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