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參數(shù)資料
| 型號(hào)： | SP693A |
| 英文描述： | Low Power Microprocessor Supervisory with Battery Switch-Over(低功耗，微處理器監(jiān)控電路（帶電池開關(guān)）) |
| 中文描述： | 低功耗微處理器監(jiān)控與電池開關(guān)過（低功耗，微處理器監(jiān)控電路（帶電池開關(guān)）） |
| 文件頁數(shù)： | 16/23頁 |
| 文件大?。?/td> | 223K |
| 代理商： | SP693A |
SP691A DS/04 SP691A/693A/800L/800M Low Power Microprocessor Supervisor with Battery Switch-Over Copyright 2000 Sipex Corporation
16
Continuous current should be limited to 25mA
and peak currents (only during power-up)
limited to 250mA. The reverse leakage of this
input is less than 1
μ
A over temperature and
supply voltage.
Output Supply Voltage
The Output Supply Voltage (V
OUT
) supplies all
the current to the external system and internal
circuitry. All open-circuit outputs will assume
the V
OUT
voltage in their high states rather than
the V
CC
voltage. At the maximum source
current of 250mA, V
OUT
will typically be
150mV below V
CC
. V
OUT
should be decoupled
with 0.1
μ
F capacitor.
TYPICAL APPLICATIONS
The
SP691A/693A/800L/800M
devices are not
short-circuit protected. Shorting V
OUT
to
ground, other than power-up transients such as
charging a decoupling capacitor, may destroy
the device. All open-circuit outputs swing
between V
OUT
and GND rather than V
CC
and
GND. If long leads connect to the chip inputs,
ensure that these lines are free from ringing and
other conditions that would forward bias the
chip's protection diodes.
There are three distinct modes of operation:
1) Normal operating mode with all circuitry
powered from V
CC
. Typical supply current
from V
is 35
μ
A, while only leakage
currents flow from the battery.
2) Battery-backup mode where V
is typically
within 0.7V below V
BATT
. All circuitry is
powered from V
current from the battery is typically less
than 5
μ
A.
3) Battery-backup mode where V
CC
is less than
V
by at least 0.7V. V
BATT
supply
current is less than 1
μ
A max.
Using High Capacity Capacitor with the
SP691A/693A/800L/800M Series
V
BATT
has the same operating voltage range as
V
CC
, and the battery-switchover threshold
voltages are typically +30mV centered at V
BATT
,
allowing use of a capacitor and a simple
charging circuit as a backup source. Refer to
Figure 25
.
If V
CC
is above the reset threshold and V
BATT
is 0.5V above V
CC
, current flows to V
OUT
and
V
CC
from V
BATT
until the voltage at V
BATT
is
less than 0.5V above V
CC
.
Leakage current through the capacitor charging
diode and
SP691A/693A/800L/800M
internal
power diode eventually discharges the capacitor
to V
CC
. Also, if V
CC
and V
BATT
start from 0.5V
above the reset threshold and power is lost at
V
CC
, the capacitor on V
BATT
discharges through
V
CC
until V
BATT
reaches the reset threshold; the
SP691A/693A/800L/800M
devices then switch
to battery-backup mode.
Using Separate Power Supplies for V
BATT
and V
If using separate power supplies for V
CC
and
V
BATT
, V
BATT
must be less than 0.3V above
V
CC
when V
CC
is above the reset threshold.
As described in the previous section, if V
BATT
exceeds this limit and power is lost at V
CC
,
current flows continuously from V
BATT
to
V
CC
via the V
BATT
-to-V
OUT
diode and the
V
OUT
-to-V
CC
switch until the circuit is broken.
Refer to
Figure 24
.
Alternative Chip-Enable Gating
Using memory devices with CE and CE inputs
allows the CE loop of the
SP691A/693A/800L/
800M
series to be bypassed. To do this,
connect CE
IN
to ground, pull up CE
OUT
to V
OUT
,
Figure 25. High Capacity Capacitor on V
BATT
(
Corporation
+5V
1N4148
0.47F
1
3
2
4
Vcc
V
BATT
V
OUT
GND
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| SP691A | Low Power Microprocessor Supervisory with Battery Switch-Over(低功耗，微處理器監(jiān)控電路（帶電池開關(guān)）) |
| SP703 | Low Power Microprocessor Supervisory with Battery Switch-Over |
| SP703CN | Low Power Microprocessor Supervisory with Battery Switch-Over |
| SP703CP | Low Power Microprocessor Supervisory with Battery Switch-Over |
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| SP693ACN | 制造商:SIPEX 制造商全稱:Sipex Corporation 功能描述:Low Power Microprocessor Supervisory with Battery Switch-Over |
| SP693ACN/TR | 制造商:SIPEX 制造商全稱:Sipex Corporation 功能描述:Low Power Microprocessor Supervisory with Battery Switch-Over |
| SP693ACP | 制造商:SIPEX 制造商全稱:Sipex Corporation 功能描述:Low Power Microprocessor Supervisory with Battery Switch-Over |
| SP693ACP-L | 制造商:Rochester Electronics LLC 功能描述: 制造商:Exar Corporation 功能描述: |
| SP693ACT | 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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