PIC16F616-ESLASHML datasheet(51/172 Pages) APEX

51 / 172 page

Preliminary

DS41288A-page 49

PIC16F616/16HV616

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 device. 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

•PWM shutdown

• Timer1 gate (count enable)

• Output synchronization to Timer1 clock input

•SR Latch

• Programmable and fixed voltage reference

• User-enable Comparator Hysteresis

8.1

Comparator Overview

A single 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

Note:

Only Comparator C2 can be linked to

Timer1.

–

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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