PIC32MX795F512LT-80ISLASHPF datasheet(161/256 Pages) MICROCHIP

161 / 256 page

DS61156G-page 161

PIC32MX5XX/6XX/7XX

26.0 COMPARATOR VOLTAGE

REFERENCE (CVREF)

The CVREF module is a 16-tap, resistor ladder network

that provides a selectable reference voltage. Although

its primary purpose is to provide a reference for the

analog comparators, it also may be used independently

of them.

A block diagram of the module is illustrated in

Figure 26-1. The resistor ladder is segmented to

provide two ranges of voltage reference values and has

a power-down function to conserve power when the

reference is not being used. The module’s supply refer-

ence can be provided from either device VDD/VSS or an

external voltage reference. The CVREF output is avail-

able for the comparators and typically available for pin

output.

The comparator voltage reference has the following

features:

• High and low range selection

• Sixteen output levels available for each range

• Internally connected to comparators to conserve

device pins

• Output can be connected to a pin

FIGURE 26-1:

COMPARATOR VOLTAGE REFERENCE BLOCK DIAGRAM

Note 1:

This data sheet summarizes the features

of the PIC32MX5XX/6XX/7XX family of

devices. It is not intended to be a

comprehensive reference source. To

complement the information in this data

sheet, refer to Section 20. “Comparator

Voltage Reference (CVREF)”

(DS61109)

in the “PIC32 Family Reference Manual”,

which is available from the Microchip web

site (www.microchip.com/PIC32).

Some registers and associated bits

described in this section may not be

available on all devices. Refer to

Section 4.0 “Memory Organization”

this data sheet for device-specific register

and bit information.

CVR<3:0>

CVREN

CVRSS = 0

AVDD

VREF+

CVRSS = 1

CVRSS = 0

VREF-

CVRSS = 1

16 Steps

CVRR

CVREFOUT

AVSS

CVROE (CVRCON<6>)

CVREF

VREFSEL(1)

IVREF

1.2V

0.6V

BGSEL<1:0>(1)

Note 1: This bit is not available on PIC32MX575/675/695/775 devices. On these devices CVREF is generated by the Register

network and IVREF is connected to 0.6V.

CVRSRC

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