鈥?/div>
Embedded control systems
Portable/Battery operated systems
Intelligent instruments
Wireless instruments
Wireless communication systems
PDAs and hand-held equipments
碌P / 碌C power supply monitoring
Safety system
General Description
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:
Typical Operating Circuit
Unregulated DC
Regulated +5V
V
CC
RESET
PFI
R
2
V
BATT
PFO
WDI
V
OUT
RESET
NMI
V
CC
R
1
0.1 碌F
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
1.6 second watchdog timer to keep microprocessor
responsive
4.40V or 4.65V V
CC
threshold for microprocessor reset at
power-up and power-down
SPDT (Single-pole, Double-throw) PMOS switch connects
backup power to RAM if V
CC
fails
1.25V threshold detector for power loss or general purpose
voltage monitoring
I/O LINE
GND
+
_
ASM690A
V
CC
CMOS
RAM
GND
These features are pin-compatible with the industry standard
power-supply supervisors. Short-circuit and thermal protection
have also been added. The AS690A / AS802L /
4.65V and the AS692A / AS802M
AS805L
generate a reset pulse when the supply voltage drops below
generate a reset below
V
BATT
V
CC
Block Diagram
8
2
Reset
Generator
+
|+
-
1
Battery-Switchover Circuit
V
OUT
7
RESET
(RESET)
4.40V. The ASM802L / ASM802M have power-fail accuracy to
鹵 2%. The ASM805L is the same as the ASM690A except that
RESET is provided instead of RESET.
Features
鈥?/div>
Two precision supply-voltage monitor options
鈥?.65V (AS690A / AS802L / AS805L)
鈥?.40V (AS692A / AS802M )
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
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
No external components
Specified over full temperature range
WDI
6
1.25V
3.5V
|+
+
-
-
|+
+
Watchdog
Timer
0.8V
PFI
4
1.25V
|+
-
+
5
PFO
ASM690A, ASM692A, ASM802L, ASM802M, (ASM805L)
3
GND
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
BUS
3.6 V
Lithium
Battery
GND
ASM802LESA相關(guān)型號(hào)PDF文件下載
-
型號(hào)
版本
描述
廠商
下載
-
英文版
3 Pin Microcontroller Power Supply Supervisor
ALSC
-
英文版
3-Pin Microcontroller Power Supply Supervisor
ALLIANCE
-
英文版
3 Pin Microcontroller Power Supply Supervisor
ALSC
-
英文版
3-Pin Microcontroller Power Supply Supervisor
ALLIANCE
-
英文版
4 Pin P Voltage Supervisor with Manual Reset
ALSC
-
英文版
4-Pin μP Voltage Supervisor with Manual Reset
ALLIANCE
-
英文版
4 Pin P Voltage Supervisor with Manual Reset
ALSC
-
英文版
4-Pin μP Voltage Supervisor with Manual Reset
ALLIANCE
-
英文版
UP Power Supply Supervisor With Battery Backup Switch
ALSC
-
英文版
μP Power Supply Supervisor With Battery Backup Switch
ALLIANCE
-
英文版
UP Power Supply Supervisor With Battery Backup Switch
ALSC
-
英文版
μP Power Supply Supervisor With Battery Backup Switch
ALLIANCE
-
英文版
UP Power Supply Supervisor With Battery Backup Switch
ALSC
-
英文版
μP Power Supply Supervisor With Battery Backup Switch
ALLIANCE
-
英文版
3-Pin Microcontroller Power Supply Supervisor
ALLIANCE
-
英文版
Low Power UP Supervisor Circuits
ALSC
-
英文版
Low Power μP Supervisor Circuits
ALLIANCE
-
英文版
Low Power 5V / 3.3V uP Reset Active LOW, Open - Drain Output
ALSC
-
英文版
Low Power 5V / 3.3V μP Reset Active LOW, Open - Drain Outpu...
ALLIANCE
-
英文版
VERY LOW-COST VOICE SYNTHESIZER WITH 4-BIT MICROPROCESSOR
APLUS
1
2
3
4
5
6
7
8
9
10
11
12
13
