PIC18F-LF1XK50 MICROCHIP [Microchip Technology], PIC18F-LF1XK50 Datasheet - Page 231

• Manufacturer Part Number: PIC18F-LF1XK50
• Description: 20-Pin USB Flash Microcontrollers
• Manufacturer: MICROCHIP [Microchip Technology]

18.7
A simplified circuit for an analog input is shown in
Figure
connection with a digital input, they have reverse
biased ESD protection diodes to V
analog input, therefore, must be between V
If the 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.
FIGURE 18-6:
 2010 Microchip Technology Inc.
18-6. Since the analog input pins share their
Analog Input Connection
Considerations
Legend: C
V
Note 1: See
A
Rs < 10K
I
R
R
V
V
LEAKAGE
A
T
PIN
IC
S
ANALOG INPUT MODEL
Section 27.0 “Electrical
A
IN
= Input Capacitance
= Leakage Current at the pin due to various junctions
= Interconnect Resistance
= Source Impedance
= Analog Voltage
= Threshold Voltage
C
5 pF
PIN
DD
and V
SS
V
and V
SS
DD
. The
V
V
T
T
Preliminary
DD
Specifications”.
 0.6V
 0.6V
.
A maximum source impedance of 10 k is recommended
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.
Note 1: When reading a PORT register, all pins
I
Vss
LEAKAGE
2: Analog levels on any pin defined as a
PIC18F/LF1XK50
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.
digital input, may cause the input buffer to
consume more current than is specified.
IC
(1)
DS41350E-page 231