PIC18F25K80 MICROCHIP [Microchip Technology], PIC18F25K80 Datasheet - Page 386
PIC18F25K80
Manufacturer Part Number
PIC18F25K80
Description
Manufacturer
MICROCHIP [Microchip Technology]
Datasheet
1.PIC18F25K80.pdf
(628 pages)
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PIC18F66K80 FAMILY
FIGURE 25-1:
25.2
The full range of voltage reference cannot be realized
due to the construction of the module. The transistors
on the top and bottom of the resistor ladder network
(Figure
ence source rails. The voltage reference is derived
from the reference source; therefore, the CV
changes with fluctuations in that source. The tested
absolute accuracy of the voltage reference can be
found in
25.3
When the device wakes up from Sleep through an
interrupt or a Watchdog Timer time-out, the contents of
the CVRCON register are not affected. To minimize
current consumption in Sleep mode, the voltage
reference should be disabled.
DS39977C-page 386
25-1) keep CV
Section 31.0 “Electrical Characteristics”
Voltage Reference Accuracy/Error
Operation During Sleep
V
V
AV
CVREN
REF
REF
DD
REF
COMPARATOR VOLTAGE REFERENCE BLOCK DIAGRAM
-
+
from approaching the refer-
CVRSS =
CVRSS =
CVRSS =
CVRSS =
0
1
32 Steps
REF
1
0
output
Preliminary
8R
.
R
R
R
R
R
R
R
clearing bit, CVREN (CVRCON<7>). This Reset also
disconnects the reference from the RF5 pin by clearing
25.4
A device Reset disables the voltage reference by
bit, CVROE (CVRCON<6>).
25.5
The voltage reference module operates independently
of the comparator module. The output of the reference
generator may be connected to the RA0 pin if the
CVROE bit is set. Enabling the voltage reference out-
put onto RA0 when it is configured as a digital input will
increase current consumption. Connecting RA0 as a
digital output with CVRSS enabled will also increase
current consumption.
The RA0 pin can be used as a simple D/A output with
limited drive capability. Due to the limited current drive
capability, a buffer must be used on the voltage
reference output for external connections to V
Figure 25-2
Effects of a Reset
Connection Considerations
CVR<4:0>
shows an example buffering technique.
2011 Microchip Technology Inc.
CV
REF
REF
.
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