參數(shù)資料
型號: 16F872
廠商: Microchip Technology Inc.
英文描述: CAT 5E CROSSOVER PATCH CORD CABLE GREEN 10 FT
中文描述: 28引腳,8位閃存微控制器的CMOS
文件頁數(shù): 83/160頁
文件大?。?/td> 2600K
代理商: 16F872
1999 Microchip Technology Inc.
Preliminary
DS30221A-page 83
PIC16F872
9.3
Connection Considerations for I
2
C
Bus
For standard-mode I
2
C bus devices, the values of
resistors
R
p
and
R
s
in
Figure 9-27
depend on the fol-
lowing parameters:
Supply voltage
Bus capacitance
Number of connected devices
(input current + leakage current).
The supply voltage limits the minimum value of resistor
R
p
due to the specified minimum sink current of 3 mA
at V
OL
max = 0.4V for the specified output stages.
For
example, with a supply voltage of V
DD
= 5V+10% and
V
OL
max = 0.4V at 3 mA, R
p min
= (5.5-0.4)/0.003 =
1.7 k
.
V
DD
as a function of
R
p
is shown in Figure 9-27.
The desired noise margin of 0.1V
DD
for the low level
limits the maximum value of
R
s
. Series resistors are
optional and used to improve ESD susceptibility.
The bus capacitance is the total capacitance of wire,
connections, and pins. This capacitance limits the max-
imum value of
R
p
due to the specified rise time
(
Figure 9-27
).
The SMP bit is the slew rate control enabled bit. This bit
is in the SSPSTAT register, and controls the slew rate
of the I/O pins when in I
2
C mode (master or slave).
FIGURE 9-27: SAMPLE DEVICE CONFIGURATION FOR I
2
C BUS
Rp
Rp
V
DD
+ 10%
SDA
SCL
DEVICE
C
b
=10 - 400 pF
Rs
Rs
Note:
I
2
C devices with input levels related to V
DD
must have one common supply line to which the pull-up resistor is also
connected.
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