PIC24FJ128GA310 datasheet(321/406 Pages) MICROCHIP

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 2010-2011 Microchip Technology Inc.

DS39996F-page 321

PIC24FJ128GA310 FAMILY

26.0

COMPARATOR VOLTAGE

REFERENCE

26.1

Configuring the Comparator

Voltage Reference

The voltage reference module is controlled through the

CVRCON register (Register 26-1). The comparator

voltage reference provides two ranges of output

voltage, each with 16 distinct levels. The range to be

used is selected by the CVRR bit (CVRCON<5>). The

primary difference between the ranges is the size of the

steps

selected

the

CVREF

Selection

bits

(CVR<3:0>), with one range offering finer resolution.

The comparator reference supply voltage can come

from either VDD and VSS, or the external VREF+ and

VREF-. The voltage source is selected by the CVRSS

bit (CVRCON<4>).

The settling time of the comparator voltage reference

must be considered when changing the CVREF

output.

FIGURE 26-1:

COMPARATOR VOLTAGE REFERENCE BLOCK DIAGRAM

Note:

This data sheet summarizes the features of

this group of PIC24F devices. It is not

intended to be a comprehensive reference

source. For more information, refer to the

“PIC24F

Family

Reference

Manual

”,

Section 19. “Dual Comparator Module”

(DS39710). The information in this data

sheet supersedes the information in the

FRM.

CVR<3:0>

CVREN

CVRSS = 0

AVDD

VREF+

CVRSS = 1

CVRSS = 0

VREF-

CVRSS = 1

16 Steps

CVRR

CVREF

AVSS

CVROE

CVREF

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