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SN8F2250B 参数 Datasheet PDF下载

SN8F2250B图片预览
型号: SN8F2250B
PDF下载: 下载PDF文件 查看货源
内容描述: 8位微控制器 [8-Bit Micro-Controller]
分类和应用: 微控制器
文件页数/大小: 133 页 / 1554 K
品牌: SONIX [ SONIX TECHNOLOGY COMPANY ]
 浏览型号SN8F2250B的Datasheet PDF文件第40页浏览型号SN8F2250B的Datasheet PDF文件第41页浏览型号SN8F2250B的Datasheet PDF文件第42页浏览型号SN8F2250B的Datasheet PDF文件第43页浏览型号SN8F2250B的Datasheet PDF文件第45页浏览型号SN8F2250B的Datasheet PDF文件第46页浏览型号SN8F2250B的Datasheet PDF文件第47页浏览型号SN8F2250B的Datasheet PDF文件第48页  
SN8F2250B Series  
USB 2.0 Full-Speed 8-Bit Micro-Controller  
3.6.2 Diode & RC Reset Circuit  
VDD  
R1  
47K ohm  
DIODE  
R2  
RST  
VSS  
MCU  
100 ohm  
C1  
0.1uF  
VCC  
GND  
This is the better reset circuit. The R1 and C1 circuit operation is like the simply reset circuit to make a power on signal.  
The reset circuit has a simply protection against unusual power. The diode offers a power positive path to conduct  
higher power to VDD. It is can make reset pin voltage level to synchronize with VDD voltage. The structure can  
improve slight brown out reset condition.  
’
Note: The R2 100 ohm resistor of “Simply reset circuit” and “Diode & RC reset circuit” is necessary to  
limit any current flowing into reset pin from external capacitor C in the event of reset pin  
breakdown due to Electrostatic Discharge (ESD) or Electrical Over-stress (EOS).  
3.6.3 Zener Diode Reset Circuit  
VDD  
R1  
33K ohm  
E
C
R2  
10K ohm  
B
Q1  
RST  
MCU  
Vz  
R3  
40K ohm  
VSS  
VCC  
GND  
The zener diode reset circuit is a simple low voltage detector and can improve brown out reset condition  
completely. Use zener voltage to be the active level. When VDD voltage level is above “Vz + 0.7V”, the C terminal of  
the PNP transistor outputs high voltage and MCU operates normally. When VDD is below “Vz + 0.7V”, the C terminal of  
the PNP transistor outputs low voltage and MCU is in reset mode. Decide the reset detect voltage by zener  
specification. Select the right zener voltage to conform the application.  
SONiX TECHNOLOGY CO., LTD  
Page 44  
Version 1.1  
 
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