PIC16F688

Manufacturer Part NumberPIC16F688
ManufacturerMicrochip Technology Inc.
PIC16F688 datasheet
 
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Page 57/202:

ANALOG INPUT CONNECTION CONSIDERATIONS

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7.1.1
ANALOG INPUT CONNECTION
CONSIDERATIONS
A simplified circuit for an analog input is shown in
Figure 7-4. Since the analog input pins share their con-
nection with a digital input, they have reverse biased
ESD protection diodes to V
and V
DD
input, therefore, must be between V
SS
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 kΩ 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.
FIGURE 7-4:
ANALOG INPUT MODEL
Rs < 10K
A
IN
C
PIN
V
A
5 pF
Legend: C
= Input Capacitance
PIN
I
= Leakage Current at the pin due to various junctions
LEAKAGE
R
= Interconnect Resistance
IC
R
= Source Impedance
S
V
= Analog Voltage
A
V
= Threshold Voltage
T
© 2007 Microchip Technology Inc.
Note 1: When reading a PORT register, all pins
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.
. The analog
SS
and V
. If the
DD
2: Analog levels on any pin defined as a
digital input, may cause the input buffer to
consume more current than is specified.
V
DD
≈ 0.6V
V
T
R
I
LEAKAGE
≈ 0.6V
V
T
±500 nA
Vss
PIC16F688
IC
To ADC Input
DS41203D-page 55