PIC16F688-I/ST View Datasheet(PDF) - Microchip Technology

Part Name

Description

Manufacturer

PIC16F688-I/ST

14-Pin Flash-Based, 8-Bit CMOS Microcontrollers with nanoWatt Technology

Microchip Technology 

7.0 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:

• Dual comparators

• Multiple comparator configurations

• Comparator outputs are available internally/exter-

nally

• Programmable output polarity

• Interrupt-on-change

• Wake-up from Sleep

• Timer1 gate (count enable)

• Output synchronization to Timer1 clock input

• Programmable voltage reference

Note: Only Comparator C2 can be linked to

Timer1.

PIC16F688

7.1 Comparator Overview

A comparator is shown in Figure 7-1 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 7-1:

SINGLE COMPARATOR

VIN+

+

VIN-

–

Output

VIN-

VIN+

Output

Note:

The black areas of the output of the

comparator represents the uncertainty

due to input offsets and response time.

This device contains two comparators as shown in

Figure 7-2 and Figure 7-3. The comparators are not

independently configurable.

© 2007 Microchip Technology Inc.

DS41203D-page 53

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