PIC18F1230 MICROCHIP [Microchip Technology], PIC18F1230 Datasheet - Page 177
PIC18F1230
Manufacturer Part Number
PIC18F1230
Description
18/20/28-Pin, Enhanced Flash Microcontrollers with nanoWatt Technology, High-Performance PWM and A/D
Manufacturer
MICROCHIP [Microchip Technology]
Datasheet
1.PIC18F1230.pdf
(312 pages)
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16.7
When a comparator is active and the device is placed
in Sleep mode, the comparator remains active and the
interrupt is functional if enabled. This interrupt will
wake-up the device from Sleep mode when enabled.
Each operational comparator will consume additional
current, as shown in the comparator specifications. To
minimize power consumption while in Sleep mode, turn
off the comparators (CMEN2:CMEN0 = 000) before
entering Sleep. If the device wakes up from Sleep, the
contents of the CMCON register are not affected.
16.8
A device Reset forces the CMCON register to its Reset
state, causing the comparator modules to be turned off
(CMEN2:CMEN0 = 000).
FIGURE 16-2:
© 2006 Microchip Technology Inc.
Comparator Operation
During Sleep
Effects of a Reset
VA
R
S
Legend:
< 10k
COMPARATOR ANALOG INPUT MODEL
A
IN
C
V
I
R
R
VA
LEAKAGE
C
5 pF
T
PIN
IC
S
PIN
= Input Capacitance
= Threshold Voltage
= Leakage Current at the pin due to various junctions
= Interconnect Resistance
= Source Impedance
= Analog Voltage
Advance Information
V
DD
V
V
T
T
= 0.6V
= 0.6V
16.9
A simplified circuit for an analog input is shown in
Figure 16-2. Since the analog pins are connected to a
digital output, they have reverse biased diodes to V
and V
V
range by more than 0.6V in either direction, one of the
diodes is forward biased and a latch-up condition may
occur. A maximum source impedance of 10 k
recommended for the analog sources. Any external
component connected to an analog input pin, such as
a capacitor or Zener diode, should have very little
leakage current.
SS
and V
SS
. The analog input, therefore, must be between
Analog Input Connection
Considerations
PIC18F1230/1330
I
±500 nA
V
LEAKAGE
DD
SS
. If the input voltage deviates from this
R
IC
Comparator
Input
DS39758B-page 175
DD
is
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