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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 ]
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SN8F2250B Series  
USB 2.0 Full-Speed 8-Bit Micro-Controller  
3.4 BROWN OUT RESET  
3.4.1 BROWN OUT DESCRIPTION  
The brown out reset is a power dropping condition. The power drops from normal voltage to low voltage by external  
factors (e.g. EFT interference or external loading changed). The brown out reset would make the system not work well  
or executing program error.  
VDD  
System Work  
Well Area  
V1  
System Work  
V2  
Error Area  
V3  
VSS  
Brown Out Reset Diagram  
The power dropping might through the voltage range that’s the system dead-band. The dead-band means the power  
range can’t offer the system minimum operation power requirement. The above diagram is a typical brown out reset  
diagram. There is a serious noise under the VDD, and VDD voltage drops very deep. There is a dotted line to separate  
the system working area. The above area is the system work well area. The below area is the system work error area  
called dead-band. V1 doesn’t touch the below area and not effect the system operation. But the V2 and V3 is under the  
below area and may induce the system error occurrence. Let system under dead-band includes some conditions.  
DC application:  
The power source of DC application is usually using battery. When low battery condition and MCU drive any loading,  
the power drops and keeps in dead-band. Under the situation, the power won’t drop deeper and not touch the system  
reset voltage. That makes the system under dead-band.  
AC application:  
In AC power application, the DC power is regulated from AC power source. This kind of power usually couples with AC  
noise that makes the DC power dirty. Or the external loading is very heavy, e.g. driving motor. The loading operating  
induces noise and overlaps with the DC power. VDD drops by the noise, and the system works under unstable power  
situation.  
The power on duration and power down duration are longer in AC application. The system power on sequence protects  
the power on successful, but the power down situation is like DC low battery condition. When turn off the AC power,  
the VDD drops slowly and through the dead-band for a while.  
SONiX TECHNOLOGY CO., LTD  
Page 40  
Version 1.1  
 
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