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ASM802MEPA PDF预览

ASM802MEPA

更新时间： 2024-11-23 22:30:15
品牌 Logo 应用领域
ALSC 电源电路电池开关电源管理电路光电二极管监控
页数 文件大小 规格书
13页 323K
描述
UP Power Supply Supervisor With Battery Backup Switch

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中文翻译

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ASM802MEPA 数据手册

 浏览型号ASM802MEPA的Datasheet PDF文件第2页浏览型号ASM802MEPA的Datasheet PDF文件第3页浏览型号ASM802MEPA的Datasheet PDF文件第4页浏览型号ASM802MEPA的Datasheet PDF文件第5页浏览型号ASM802MEPA的Datasheet PDF文件第6页浏览型号ASM802MEPA的Datasheet PDF文件第7页 
ASM690A / 692A  
ASM802L / 802M  
ASM805L  
October 2003  
rev 1.0  
µP Power Supply Supervisor With Battery Backup Switch  
General Description  
Applications  
The AS690A / AS692A / AS802L / AS802M / AS805L offers  
complete single chip solutions for power supply monitoring and  
control battery functions in microprocessor systems. Each  
device implements four functions: Reset control, watchdog  
monitoring, battery-backup switching and power-failure  
monitoring. In addition to microprocessor reset under power-up  
and power-down conditions, these devices provide battery-  
backup switching to maintain control in power loss and brown-  
out situations. Additional monitoring capabilities can provide an  
early warning of unregulated power supply loss before the  
voltage regulator drops out. The important features of these  
four functions are:  
•
•
•
•
•
•
•
•
Embedded control systems  
Portable/Battery operated systems  
Intelligent instruments  
Wireless instruments  
Wireless communication systems  
PDAs and hand-held equipments  
µP / µC power supply monitoring  
Safety system  
Typical Operating Circuit  
Unregulated DC  
Regulated +5V  
V
V
CC  
CC  
0.1 µF  
R
1
RESET  
PFO  
RESET  
NMI  
•
•
1.6 second watchdog timer to keep microprocessor  
responsive  
PFI  
V
BATT  
WDI  
I/O LINE  
GND  
R
2
4.40V or 4.65V VCC threshold for microprocessor reset at  
power-up and power-down  
+
V
3.6 V  
GND  
OUT  
_
Lithium  
Battery  
•
•
SPDT (Single-pole, Double-throw) PMOS switch connects  
backup power to RAM if VCC fails  
ASM690A  
1.25V threshold detector for power loss or general purpose  
voltage monitoring  
CMOS  
V
RAM  
CC  
These features are pin-compatible with the industry standard  
power-supply supervisors. Short-circuit and thermal protection  
have also been added. The AS690A / AS802L / AS805L  
generate a reset pulse when the supply voltage drops below  
4.65V and the AS692A / AS802M generate a reset below  
4.40V. The ASM802L / ASM802M have power-fail accuracy to  
± 2%. The ASM805L is the same as the ASM690A except that  
RESET is provided instead of RESET.  
GND  
Block Diagram  
1
8
Battery-Switchover Circuit  
V
V
OUT  
BATT  
2
V
CC  
7
Reset  
RESET  
(RESET)  
Generator  
+
-
|+  
Features  
1.25V  
Watchdog  
Timer  
•
Two precision supply-voltage monitor options  
•4.65V (AS690A / AS802L / AS805L)  
•4.40V (AS692A / AS802M )  
3.5V  
+
-
|+  
6
4
-
WDI  
PFI  
•
•
•
•
•
•
•
Battery-backup power switch on-chip  
Watchdog timer: 1.6 second timeout  
Power failure / low battery detection  
Short circuit protection and thermal limiting  
Small 8-pin SO package  
|+  
+
1.25V  
|+  
0.8V  
5
-
PFO  
+
ASM690A, ASM692A, ASM802L, ASM802M, (ASM805L)  
GND  
3
No external components  
Specified over full temperature range  
Alliance Semiconductor  
2575 Augustine Drive . Santa Clara, CA 95054 . Tel: 408.855.4900 . Fax: 408.855.4999 . www.alsc.com  
Notice: The information in this document is subject to change without notice  
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