PIC18F47J53 Datasheet, PDF (415/586 Pages) Microchip Technology – 28/44-Pin, High-Performance USB Microcontrollers with nanoWatt XLP Technology

PIC18F47J53 FAMILY
25.0 COMPARATOR VOLTAGE
REFERENCE MODULE
The comparator voltage reference 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 may also be
used independently of them.
Figure 25-1 provides a block diagram of the module.
The resistor ladder is segmented to provide two ranges
of CVREF values and has a power-down function to
conserve power when the reference is not being used.
The module’s supply reference can be provided from
either device VDD/VSS or an external voltage reference.
FIGURE 25-1:
COMPARATOR VOLTAGE REFERENCE BLOCK DIAGRAM
VREF+ ^{CVRSS = 1}
VDD
CVRSS = 0
8R
CVREN
R
R
R
R
16 Steps
CVR<3:0>
CVREF
R
R
R
CVRR
VREF-
8R
CVRSS = 1
CVRSS = 0
 2010 Microchip Technology Inc.
DS39964B-page 415