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參數(shù)資料
| 型號： | IMP802MESA |
| 廠商： | IMP INC. |
| 英文描述： | レP POWER SUPPLY SUPERVISOR WITH BATTERY BACKUP SWITCH |
| 中文描述： | レp電源輸入電源監(jiān)控帶備用電池開關(guān) |
| 文件頁數(shù)： | 1/10頁 |
| 文件大?。?/td> | 225K |
| 代理商： | IMP802MESA |
Key Features
Applications
N
Embedded control systems
N
Battery–operated systems
N
Intelligent instruments
N
Wireless communication systems
N
PDAs and handheld equipment
N
μ
P/
μ
C power supply monitoring
N
Design improvement over Maxim
MAX690A/692A/802L/802M/805L
— 70% lower current than Maxim:
100
μ
A maximum
— RESET Operation to 1.1V
N
Two precision supply-voltage monitor options
— 4.65V (IMP690A/802L/805L)
— 4.40V (IMP692A/802M)
N
Battery-backup power switch on-chip
N
Watchdog timer: 1.6 second timeout
N
Power failure/low battery detection
N
Short-circuit protection and thermal limiting
N
Small 8-pin SO package
N
No external components
N
Specified over full temperature range
Block Diagrams
+
–
GND
Unregulated DC
Regulated +5V
V
OUT
V
CC
RESET
WDI
3.6V
Lithium
Battery
0.1
μ
F
PFO
V
BATT
PFI
R
1
R
2
RESET
V
CC
GND
GND
V
CC
CMOS
RAM
NMI
I/O LINE
B
690A_01.eps
IMP690A
IMP690A
, 692A
, 802L/M, 805L
P
OWER
M
ANAGEMENT
μ
μ
P P
o
o
w
w
er Suppl
wit
h Batt
er
er
y Bac
The IMP690A/IMP692A/IMP802L/IMP802M/IMP805L simplify power
supply monitoring and control in microprocessor systems. Each circuit
implements four functions: Reset control, watchdog monitoring, battery-
backup switching and power-failure monitoring. In addition to
microprocessor reset under powerup 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:
a)
1.6 second watchdog timer to keep microprocessor responsive
y Super
kup Switc
h
h
visor
b)
4.40V or 4.65V V
CC
threshold for microprocessor reset at power-up
and power-down
c)
SPDT (single-pole, double-throw) PMOS switch connects backup
power to RAM if V
CC
fails
d)
1.25V threshold detector for power loss or general purpose voltage
monitoring
While these features are pin–compatible with the industry standard
power–supply supervisors offered by Maxim, the IMP devices are supe-
rior replacements and can reduce power requirements by 70 percent
when compared to Maxim MAX690/MAX692A/MAX802L/MAX802M/
MAX805L devices. Short-circuit and thermal protection have also
been added.
The IMP690A/IMP802L/IMP805L generate a reset pulse when the
supply voltage drops below 4.65V, and the IMP692A/IMP802M
generate a reset below 4.40V. The IMP802L/IMP802M have power–fail
accuracy to ±2%. The IMP805L is the same as the IMP690A except that
RESET is provided instead of
IMP, Inc.
San Jose, CA
408-432-9100/www.impweb.com
+
+
+
+
+
+
+
+
V
CC
V
OUT
1
7
5
3
PFI
WDI
GND
V
BATT
8
2
6
4
PFO
IMP690A, IMP692A, IMP802L, IMP802M,
IMP805L
RESET
(RESET)
( ) IMP805L
Battery-Switchover
Circuit
Reset
Generator
Watchdog
Timer
3.5V
1.25V
1.25V
0.8V
690A_03.eps
Typical Application
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