SE8 datasheet(179/478 Pages) MICROCHIP

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 2010-2012 Microchip Technology Inc.

DS41414D-page 179

PIC16(L)F1946/47

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.

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

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.

The comparators available for this device are located in

Table 18-1.

FIGURE 18-1:

SINGLE COMPARATOR

TABLE 18-1:

COMPARATOR AVAILABILITY

PER DEVICE

Device

PIC16(L)F1946

●●●

PIC16(L)F1947

●●●

–

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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