参数资料
型号: RFPIC12F675K-E/SS
元件分类: 微控制器/微处理器
英文描述: 8-BIT, FLASH, 20 MHz, RISC MICROCONTROLLER, PDSO20
封装: 0.209 INCH, PLASTIC, MO-150, SSOP-20
文件页数: 56/123页
文件大小: 5438K
代理商: RFPIC12F675K-E/SS
rfPIC12F675
DS70091A-page 36
Preliminary
2003 Microchip Technology Inc.
6.3
Analog Input Connection
Considerations
A simplified circuit for an analog input is shown in
Figure 6-3. Since the analog pins are connected to a
digital output, they have reverse biased diodes to V
DD
and V
SS. The analog input, therefore, must be between
V
SS and VDD. 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 latchup may occur. A
maximum
source
impedance
of
10 k
is
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.
FIGURE 6-3:
ANALOG INPUT MODE
6.4
Comparator Output
The comparator output, COUT, is read through the
CMCON register. This bit is read-only. The comparator
output may also be directly output to the GP2 pin in
three of the eight possible modes, as shown in
Figure 6-2. When in one of these modes, the output on
GP2 is asynchronous to the internal clock. Figure 6-4
shows the comparator output block diagram.
The TRISIO<2> bit functions as an output enable/
disable for the GP2 pin while the comparator is in an
Output mode.
FIGURE 6-4:
MODIFIED COMPARATOR OUTPUT BLOCK DIAGRAM
VA
Rs < 10K
A
IN
C
PIN
5 pF
V
DD
V
T = 0.6V
V
T = 0.6V
R
IC
Leakage
±500 nA
Vss
Legend:
C
PIN
= Input Capacitance
V
T
= Threshold Voltage
I
LEAKAGE
= Leakage Current at the pin due to Various Junctions
R
IC
= Interconnect Resistance
R
S
= Source Impedance
VA
= Analog Voltage
Note 1: When reading the GPIO register, all pins
configured as analog inputs will read as a
‘0’. Pins configured as digital inputs will
convert an analog input according to the
TTL input specification.
2: Analog levels on any pin that is defined as
a digital input, may cause the input buffer
to
consume
more
current
than
is
specified.
To GP2/T0CKI pin
RD CMCON
Set CMIF bit
RESET
To Data Bus
CINV
CV
REF
D
EN
Q
D
EN
Q
RD CMCON
GP1/CIN-
GP0/CIN+
CM2:CM0
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