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| 型號： | SP800MET |
| 英文描述： | Datamate J-Tek DIL Male Horizontal SMT Connector, selective gold + tin/lead, with jackscrews, 3+3-way |
| 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)： | 14/24頁 |
| 文件大?。?/td> | 196K |
| 代理商： | SP800MET |
Date: 5/25/04 SP691A/693A/800L/800M Low Power Microprocessor Supervisor with Battery Switch-Over Copyright 2004 Sipex Corporation
14
Chip-Enable Output
In the enabled mode, the impedance of CE
is equivalent to 65
in series with the source
driving CE
. In the disabled mode, the 65
transmission gate is off and CE
is actively
pulled to V
OUT
. This source turns off when the
transmission gate is enabled.
LOWLINE Output
LOWLINE is the buffered output pin of the
reset threshold comparator. Refer to
Figure 16
.
LOWLINE typically sinks 3.2mA at 0.1V. For
normal operation where V
is above the reset
threshold, LOWLINE is pulled to V
OUT
.
Power-Fail Comparator
The power-fail comparator is an uncommitted
comparator that has no effect on the other
functions of the
SP691A/693A/800L/800M
devices. Common uses include low battery
detection, as found in
Figure 23
, and early
power-fail detection when the unregulated power
is easily accessible as shown in
Figure 17
.
Power-Fail Input
The Power-Fail Input (PFI) has a guaranteed
input leakage of +25nA max over temperature.
The typical comparator delay is 25
μ
s from V
IL
to V
OL
(power failing), and 60
μ
s from V
IH
to
V
OH
(power being restored). Connect this
input to ground if PFI is not used.
Power-Fail Output
The Power-Fail Output (PFO) goes low when
PFI goes below 1.25V. It sinks 3.2mA with a
saturation voltage of 0.1V. With PFI above
1.25V, PFO is actively pulled to V
OUT
. PFO
can be used to generate an NMI for the
μ
P, as
shown in
Figure 17
.
Battery-Backup Mode
The
SP691A/693A/800L/800M
requires two
conditions to switch to battery-backup mode:
1) V
CC
must be below the reset threshold; 2)
V
CC
must be below V
BATT
.
Table 2
lists the
status of the inputs and outputs in battery-
backup mode.
Battery-On Output
The Battery On Output (BATT ON) indicates
the status of the internal V
CC
/battery-switchover
comparator, which controls the internal V
CC
and
V
BATT
switches. For V
CC
greater that V
BATT
(ignoring the small hysteresis effect), BATT ON
is a logic low. For V
less than V
, BATT
ON is a logic high. Use BATT ON to indicate
battery-switchover status or to supply base drive
to an external pass transistor for higher-current
applications. Refer to
Figure 17.
CE
OUT
CE
IN
12
V
BATT
2.8V
GND
1
13
4
C
LOAD
PFO
+2.0V
to
+5.5V
R
2
R
1
V
CC
+5V
GND
LOW BATT
PFI
V
BATT
Figure 22. Chip Enable Propagation Delay Test Circuit
Figure 23. Low-Battery Indicator Circuit
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相關(guān)代理商/技術(shù)參數(shù) |
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|---|---|
| SP800MET/TR | 制造商:SIPEX 制造商全稱:Sipex Corporation 功能描述:Low Power Microprocessor Supervisory with Battery Switch-Over |
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| SP800TAC-43 | 制造商:The Bergquist Company 功能描述:BG401756 |
| SP800TAC-54 | 制造商:The Bergquist Company 功能描述: |
| SP80186U WAF | 制造商:Intel 功能描述: |
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