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PIC16F877T-20PQ 参数 Datasheet PDF下载

PIC16F877T-20PQ图片预览
型号: PIC16F877T-20PQ
PDF下载: 下载PDF文件 查看货源
内容描述: 8位微控制器\n [8-Bit Microcontroller ]
分类和应用: 微控制器
文件页数/大小: 200 页 / 3338 K
品牌: ETC [ ETC ]
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PIC16F87X  
2
example, with a supply voltage of VDD = 5V+10% and  
9.3  
Connection Considerations for I C  
Bus  
VOL max = 0.4V at 3 mA, R  
= (5.5-0.4)/0.003 =  
p min  
1.7 kΩ. VDD as a function of R is shown in Figure 9-27.  
p
2
For standard-mode I C bus devices, the values of  
The desired noise margin of 0.1VDD for the low level  
resistors R and R in Figure 9-27 depend on the fol-  
limits the maximum value of R . Series resistors are  
p
s
s
lowing parameters:  
optional and used to improve ESD susceptibility.  
• Supply voltage  
• Bus capacitance  
The bus capacitance is the total capacitance of wire,  
connections, and pins. This capacitance limits the max-  
• Number of connected devices  
(input current + leakage current).  
imum value of R due to the specified rise time  
(Figure 9-27).  
p
The supply voltage limits the minimum value of resistor  
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 C mode (master or slave).  
R
due to the specified minimum sink current of 3 mA  
p
2
at VOL max = 0.4V for the specified output stages. For  
2
FIGURE 9-27: SAMPLE DEVICE CONFIGURATION FOR I C BUS  
VDD + 10%  
DEVICE  
Rp  
Rp  
Rs  
Rs  
SDA  
SCL  
Cb=10 - 400 pF  
Note:  
I2C devices with input levels related to VDD must have one common supply  
line to which the pull-up resistor is also connected.  
1999 Microchip Technology Inc.  
DS30292B-page 93  
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