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參數(shù)資料
| 型號(hào)： | 16F630 |
| 廠商： | Microchip Technology Inc. |
| 英文描述： | 14-Pin FLASH-Based 8-Bit CMOS Microcontrollers |
| 中文描述： | 14引腳基于閃存的8位CMOS微控制器 |
| 文件頁數(shù)： | 42/132頁 |
| 文件大?。?/td> | 2651K |
| 代理商： | 16F630 |
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PIC16F630/676
DS40039C-page 40
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 V
DD
. 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
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.
of
10 k
is
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 RA2 pin in
three of the eight possible modes, as shown in
Figure 6-2. When in one of these modes, the output on
RA2 is asynchronous to the internal clock. Figure 6-4
shows the comparator output block diagram.
The TRISA<2> bit functions as an output enable/
disable for the RA2 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
V
T
I
LEAKAGE
R
IC
R
S
VA
= Input Capacitance
= Threshold Voltage
= Leakage Current at the pin due to Various Junctions
= Interconnect Resistance
= Source Impedance
= Analog Voltage
Note 1:
When reading the PORTA 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 RA2/T0CKI pin
RD CMCON
Set CMIF bit
RESET
To Data Bus
CINV
CV
REF
D
EN
Q
D
EN
Q
RD CMCON
RA1/CIN-
RA0/CIN+
CM2:CM0
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