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SN8P26042A 参数 Datasheet PDF下载

SN8P26042A图片预览
型号: SN8P26042A
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: 101 页 / 733 K
品牌: SONIX [ SONIX TECHNOLOGY COMPANY ]
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SN8P2604A  
8-Bit Micro-Controller  
3.6.4 Voltage Bias Reset Circuit  
VDD  
R1  
47K ohm  
E
C
B
Q1  
RST  
MCU  
R2  
10K ohm  
R3  
2K ohm  
VSS  
VCC  
GND  
The voltage bias reset circuit is a low cost voltage detector and can improve brown out reset condition completely.  
The operating voltage is not accurate as zener diode reset circuit. Use R1, R2 bias voltage to be the active level. When  
VDD voltage level is above or equal to “0.7V x (R1 + R2) / R1”, the C terminal of the PNP transistor outputs high  
voltage and MCU operates normally. When VDD is below “0.7V x (R1 + R2) / R1”, the C terminal of the PNP transistor  
outputs low voltage and MCU is in reset mode.  
Decide the reset detect voltage by R1, R2 resistances. Select the right R1, R2 value to conform the application. In the  
circuit diagram condition, the MCU’s reset pin level varies with VDD voltage variation, and the differential voltage is  
0.7V. If the VDD drops and the voltage lower than reset pin detect level, the system would be reset. If want to make the  
reset active earlier, set the R2 > R1 and the cap between VDD and C terminal voltage is larger than 0.7V. The external  
reset circuit is with a stable current through R1 and R2. For power consumption issue application, e.g. DC power  
system, the current must be considered to whole system power consumption.  
’
Note: Under unstable power condition as brown out reset, “Zener diode rest circuit” and “Voltage bias  
reset circuit” can protects system no any error occurrence as power dropping. When power drops  
below the reset detect voltage, the system reset would be triggered, and then system executes  
reset sequence. That makes sure the system work well under unstable power situation.  
SONiX TECHNOLOGY CO., LTD  
Page 46  
Version 0.3  
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