Microchip Technology TDGL019 Data Sheet

© 2011-2014 Microchip Technology Inc.

DS60001168F-page 215

The CV

REF

 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.
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 reference can be pro-
vided from either device V

DD

/V

SS

 or an external

voltage reference. The CV

REF

 output is available 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
A block diagram of the module is shown in 

This data sheet summarizes the
features of the PIC32MX1XX/2XX
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
(CV

 (DS60001109) in the “PIC32

, which is

available from the Microchip web site
(

Some registers and associated bits
described in this section may not be
available on all devices. Refer to

 in

this data sheet for device-specific
register and bit information.

16-

to-1 MU

X

CVR<3:0>

8R

R

CVREN

CVRSS = 0

AV

DD

V

REF

+

CVRSS = 1 

8R

CVRSS = 0

V

REF

-

CVRSS = 1 

R

R

R

R

R

R

16 Steps

CVRR

CV

REFOUT

AV

SS

CVRCON<CVROE>

CV

REF

CV

RSRC