PIC16F88

Manufacturer Part NumberPIC16F88
ManufacturerMicrochip Technology Inc.
PIC16F88 datasheet
 
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Page 127/228:

Effects of a Reset

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13.7
Comparator Operation During
Sleep
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.
While the comparator is powered up, higher Sleep
currents than shown in the power-down current
specification will occur. Each operational comparator
will consume additional current, as shown in the com-
parator specifications. To minimize power consumption
while in Sleep mode, turn off the comparators,
CM<2:0> = 111, before entering Sleep. If the device
wakes up from Sleep, the contents of the CMCON
register are not affected.
13.8

Effects of a Reset

A device Reset forces the CMCON register to its Reset
state, causing the comparator module to be in the
Comparator Off mode, CM<2:0> = 111.
FIGURE 13-4:
ANALOG INPUT MODEL
R
< 10K
S
A
IN
C
PIN
VA
5 pF
Legend:
C
= Input Capacitance
PIN
V
= Threshold Voltage
T
I
= Leakage Current at the pin due to various junctions
LEAKAGE
R
= Interconnect Resistance
IC
R
= Source Impedance
S
VA
= Analog Voltage
 2005 Microchip Technology Inc.
PIC16F87/88
13.9
Analog Input Connection
Considerations
A simplified circuit for an analog input is shown in
Figure 13-4. Since the analog pins are connected to a
digital output, they have reverse biased diodes to V
and V
. The analog input, therefore, must be between
SS
V
and V
. If the input voltage deviates from this
SS
DD
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 a Zener diode, should have very little
leakage current.
V
DD
V
= 0.6V
T
R
IC
I
LEAKAGE
V
= 0.6V
T
±500 nA
V
SS
DD
is
DS30487C-page 125