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PIC32MX3XX/4XX
24.0
COMPARATOR VOLTAGE
REFERENCE (CV REF )
The CV REF is a 16-tap, resistor ladder network that pro-
vides a selectable reference voltage. Although its pri-
mary purpose is to provide a reference for the analog
Note 1: This data sheet summarizes the features
of the PIC32MX3XX/4XX family of
devices. It is not intended to be a compre-
hensive reference source. Refer to Sec-
tion 20. “Comparator Voltage
Reference (CV REF )” (DS61109) of the
“PIC32MX Family Reference Manual” ,
which is available from the Microchip web
site (www.microchip.com/PIC32).
2: Some registers and associated bits
described in this section may not be avail-
able on all devices. Refer to Section 4.0
“Memory Organization” in this data
sheet for device-specific register and bit
information.
comparators, it also may be used independently of
them.
A block diagram of the module is illustrated in
Figure 24-1. 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 V DD /V SS or an
external voltage reference. The CV REF 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 24-1:
V REF +
COMPARATOR VOLTAGE REFERENCE BLOCK DIAGRAM
CVRSS = 1
AV DD
CVREN
CVRSS = 0
8R
R
R
CVR3:CVR0
CV REF
R
R
16 Steps
R
R
R
CV REF OUT
CVRCON<CVROE>
CVRR
V REF -
AV SS
? 2010 Microchip Technology Inc.
CVRSS = 1
CVRSS = 0
8R
DS61143G-page 127
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