PIC12F615 datasheet(67/212 Pages) MICROCHIP

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 2010 Microchip Technology Inc.

DS41302D-page 67

PIC12F609/615/617/12HV609/615

9.0

COMPARATOR MODULE

The comparator can be used to interface analog

circuits to a digital circuit by comparing two analog

voltages and providing a digital indication of their

relative magnitudes. The comparator is a very useful

mixed signal building block because it provides analog

functionality independent of the program execution.

The Analog Comparator module includes the following

features:

• Programmable input section

• 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

• Programmable voltage reference

• User-enable Comparator Hysteresis

9.1

Comparator Overview

The comparator is shown in Figure 9-1 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 9-1:SINGLE COMPARATOR

FIGURE 9-2:

COMPARATOR SIMPLIFIED 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.

CMOE

MUX

CMPOL

CMON(1)

CMCH

From Timer1

Clock

Note

When CMON = 0, the comparator will produce a ‘0’ output to the XOR Gate.

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

Q1 is held high during Sleep mode.

Output shown for reference only. See I/O port pin diagram for more details.

RD_CMCON0

Q3*RD_CMCON0

Set CMIF

Reset

CMVIN-

CMVIN+

GP1/CIN0-

GP4/CIN1-

CMSYNC

CMPOL

Data Bus

MUX

COUT(4)

To PWM Auto-Shutdown

To Timer1 Gate

CMR

MUX

GP0/CIN+

MUX

CVREF

CMVREN

FixedRef

CMVREF

SYNCCMOUT

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