PIC16 datasheet(153/418 Pages) MICROCHIP

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DS40001609C-page 153

PIC16(L)F1508/9

17.0 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

17.1

Comparator Overview

A single comparator is shown in Figure 17-2 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 listed in

Table 17-1.

FIGURE 17-1:

COMPARATOR MODULE SIMPLIFIED BLOCK DIAGRAM

TABLE 17-1:

AVAILABLE COMPARATORS

Device

PIC16(L)F1509

●●

PIC16(L)F1508

●●

Rev. 10-000027A

8/5/2013

000

CxIN0-

CxIN1-

CxIN2-

CxIN3-

CxIN+

FVR_buffer2

DAC_out

CxVN

CxVP

CxPCH<1:0>

CxNCH<2:0>

CxON

(1)

CxON

(1)

CxON

(1)

CxSP CxHYS

Interrupt

Rising

Edge

CxINTP

CxINTN

CxOUT

MCxOUT

CxOUT_async

CxSYNC

set bit

CxIF

TRIS bit

CxOUT

CxOUT_sync

peripherals

CxOE

Interrupt

Falling

Edge

Note 1:

When CxON =

0, all multiplexer inputs are disconnected and the Comparator will produce a ‘0’ at the output.

FVR_buffer2

CxPOL

(From Timer1 Module) T1CLK

001

010

011

100

peripherals

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