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參數(shù)資料
| 型號： | SP791EP |
| 英文描述： | Low Power Microprocessor Supervisory with Battery Switch-Over |
| 中文描述： | 低功耗微處理器監(jiān)控與電池開關(guān)過 |
| 文件頁數(shù)： | 1/19頁 |
| 文件大?。?/td> | 202K |
| 代理商： | SP791EP |
1
SP791DS/08 SP791 Low Power Microprocessor Supervisory with Battery Switch-Over
Copyright 2000 Sipex Corporation
I
Precision 4.65V Voltage Monitoring
I
200ms Power-OK/Reset Time Delay
I
Independent Watchdog Time-Preset or Adjustable
I
75
μ
A Maximum Operating Supply Current
I
1.0
μ
A Maximum Battery Backup Current
I
0.1
μ
A Maximum Battery Standby Current
I
Power Switching
250mA Output in Vcc Mode (0.6
)
25mA Output in Battery Mode (5
)
I
On-Board Gating of Chip-Enable Signals
Memory Write-Cycle Completion
6ns CE Gate Propagation Delay
I
Voltage Monitor for Power-Fail or Low Battery
I
Backup-Battery Monitor
I
RESET Valid to Vcc=1V
I
Pin Compatible Upgrade to MAX791
DESCRIPTION
The
SP791
is a microprocessor (
μ
P) supervisory circuit that integrates a myriad of compo-
nents involved in discrete solutions to monitor power-supply and battery-control functions in
μ
P and digital systems. The
SP791
offers complete
μ
P monitoring and watchdog functions.
The
SP791
is ideal for a low-cost battery management solution and is well suited for portable,
battery-powered applications with its supply current of 40
μ
A. The 6ns chip-enable propaga-
tion delay, the 25mA current output in battery-backup mode, and the 250mA current output
in standard operation also makes the
SP791
suitable for larger scale, high-performance
equipment.
SP791
Figure 1. Block Diagram
150mV
4.65V
Vcc
V
BATT
CE
IN
13
1
3
LOWLINE
BATT ON
V
OUT
10
5
2
CE OUT
12
+
+
+
_
_
_
+
_
_
+
SP791
MR
SWT
WDI
PFI
1.25V
4
GND
7
11
8
9
RESET
WDPO
PFO
16
15
WDO
14
6
+
_
+
_
WATCHDOG
V
OUT
TIRESET AND
WATCHDOG
DETECTOR
GERESET
2V
COUTPUT
CONTROL
Low Power Microprocessor Supervisory
with Battery Switch-Over
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