PIC32MX320F032H_11 Datasheet, PDF (127/214 Pages) Microchip Technology – High-Performance, General Purpose and USB, 32-bit Flash Microcontrollers

PIC32MX3XX/4XX
24.0 COMPARATOR VOLTAGE
REFERENCE (CVREF)
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 (CVREF)” (DS61109) of the
“PIC32 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
available on all devices. Refer to
Section 4.0 “Memory Organization” in
this data sheet for device-specific register
and bit information.
The CVREF 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
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 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 24-1:
COMPARATOR VOLTAGE REFERENCE BLOCK DIAGRAM
VREF+
CVRSS = 1
AVDD
CVRSS = 0
8R
CVREN
R
R
R
R
16 Steps
CVRR
VREF-
AVSS
R
R
R
CVRSS = 1
CVRSS = 0
CVR3:CVR0
CVREF
CVREF_OUT
CVRCON<CVROE>
8R
© 2011 Microchip Technology Inc.
DS61143H-page 127