PIC12F609-I/PQTP MICROCHIP [Microchip Technology], PIC12F609-I/PQTP Datasheet - Page 56

• Manufacturer Part Number: PIC12F609-I/PQTP
• Description: 8-Pin Flash-Based, 8-Bit CMOS Microcontrollers
• Manufacturer: MICROCHIP [Microchip Technology]

PIC12F609/615/12HV609/615
8.2
A simplified circuit for an analog input is shown in
Figure 8-3. Since the analog input pins share their con-
nection with a digital input, they have reverse biased
ESD protection diodes to V
input, therefore, must be between V
input voltage deviates from this range by more than
0.6V in either direction, one of the diodes is forward
biased and a latch-up may occur.
A maximum source impedance of 10 k
mended for the analog sources. Also, any external
component connected to an analog input pin, such as
a capacitor or a Zener diode, should have very little
leakage current to minimize inaccuracies introduced.
FIGURE 8-3:
DS41302A-page 54
Analog Input Connection
Considerations
Legend: C
V
A
R
S
< 10K
I
R
R
V
V
LEAKAGE
A
T
PIN
IC
S
ANALOG INPUT MODEL
A
DD
IN
= Input Capacitance
= Leakage Current at the pin due to various junctions
= Interconnect Resistance
= Source Impedance
= Analog Voltage
= Threshold Voltage
and V
C
5 pF
PIN
SS
SS
and V
. The analog
is recom-
V
DD
DD
. If the
V
V
T
T
Preliminary
0.6V
0.6V
Note 1: When reading a GPIO register, all pins
I
±500 nA
V
LEAKAGE
SS
2: Analog levels on any pin defined as a dig-
R
configured as analog inputs will read as a
‘0’. Pins configured as digital inputs will
convert as an analog input, according to
the input specification.
ital input, may cause the input buffer to
consume more current than is specified.
IC
© 2006 Microchip Technology Inc.
To Comparator