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參數(shù)資料
| 型號： | SP805L |
| 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)： | 9/16頁 |
| 文件大?。?/td> | 631K |
| 代理商： | SP805L |
SP690A/692ADS/08 SP690A/692A Low Power Microprocessor Supervisory with Battery Switch-Over
Copyright 2000 Sipex Corporation
9
THEORY OF OPERATION
The
SP690A/692A/802L/802M/805L/805M
microprocessor (
μ
P) supervisory circuits
monitor the power supplied to digital circuits
such as microprocessors, microcontrollers, or
memory. The series is an ideal solution for
portable, battery-powered equipment that
requires power supply monitoring. Implementing
this series will reduce the number of
components and overall complexity. The
watchdog functions of this product family will
continuously oversee the operational status of a
system. The operational features and benefits of
the
SP690A/692A/802L/802M/805L/805M
are
described in more detail below.
Reset Output
The microprocessor's (
μ
P's) reset input starts
the
μ
P in a known state. When the
μ
P is in an
unknown state, it should be held in reset. The
SP690A/SP692A/SP802
assert reset during
power-up and prevent code execution errors
during power-down or brownout conditions.
On power-up, once V
reaches 1V, RESET is
guaranteed to be a logic low. As V
rises,
RESET remains low. When V
exceeds the
reset threshold, RESET will remain low for
200ms,
Figure 9
. If a brownout condition
occurs and V
dips below the reset threshold,
RESET is triggered. Each time RESET is
triggered, it stays low for the reset pulse width
interval. If a brownout condition interrupts a
previously initiated reset pulse, the reset pulse
continues for another 200ms. On power-down,
once V
goes below the threshold, RESET is
guaranteed to be logic low until V
CC
drops
below 1V.
RESET is also triggered by a watchdog timeout.
If WDI remains either high or low for a period
that exceeds the watchdog timeout period (1.6
sec), RESET pulses low for 200mS. As long as
RESET is asserted, the watchdog timer remains
clear. When RESET comes high, the watchdog
resumes timing and must be serviced within
1.6sec. If WDI is tied high or low, a RESET
pulse is triggered every 1.8sec (t
WD
plus t
RS
).
FEATURES
The
SP690A/692A/802L/802M/805L/805M
provide four key functions:
1. A battery backup switching for CMOS RAM,
CMOS microprocessors, or other logic.
2. A reset output during power-up, power-down
and brownout conditions.
3. A reset pulse if the optional watchdog timer
has not been toggled within a specified time.
4. A 1.25V threshold detector for power-fail
warning, low battery detection, or to monitor a
power supply other than +5V.
The parts differ in their reset-voltage threshold
levels and reset outputs. The
SP690A/802L/
805L
generate a reset when the supply voltage
drops below 4.65V. The
SP692A/802M/805M
generate a reset below 4.40V.
The
SP690A/692A/802L/802M/805L/805M
are ideally suited for applications in automotive
systems, intelligent instruments, and battery-
powered computers and controllers. All designs
into an environment where it is critical to
monitor the power supply to the
μ
P and it’s
related digital components will find the
SSP690A/692A/802L/802M/805L/805M
ideal.
Figure 12. Typical Operating Circuit
GND
GND
RESET
NMI
I/O LINE
V
CC
RESET
PFO
WDI
V
OUT
BUS
V
CC
GND
V
BATT
R
2
R
1
Unregulated
DC
Regulated +5V
V
CC
0.1
μ
F
PFI
L3.6V
Battery
μ
P
CMOS
RAM
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| SP690AEN | Low Power Microprocessor Supervisory with Battery Switch-Over |
| SP690AEP | Low Power Microprocessor Supervisory with Battery Switch-Over |
| SP805LCN | Low Power Microprocessor Supervisory with Battery Switch-Over |
| SP805LCP | Low Power Microprocessor Supervisory with Battery Switch-Over |
| SP805LEN | Low Power Microprocessor Supervisory with Battery Switch-Over |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| SP805LCN | 制造商:SIPEX 制造商全稱:Sipex Corporation 功能描述:Low Power Microprocessor Supervisory with Battery Switch-Over |
| SP805LCN/TR | 制造商:SIPEX 制造商全稱:Sipex Corporation 功能描述:Low Power Microprocessor Supervisory with Battery Switch-Over |
| SP805LCN-L | 功能描述:監(jiān)控電路 LW PWR MICRO 5.5V 25mA-250mA BAT SW/OV RoHS:否 制造商:STMicroelectronics 監(jiān)測電壓數(shù): 監(jiān)測電壓: 欠電壓閾值: 過電壓閾值: 輸出類型:Active Low, Open Drain 人工復(fù)位:Resettable 監(jiān)視器:No Watchdog 電池備用開關(guān):No Backup 上電復(fù)位延遲（典型值）:10 s 電源電壓-最大:5.5 V 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:UDFN-6 封裝:Reel |
| SP805LCN-L/TR | 功能描述:監(jiān)控電路 LW PWR MICRO 5.5V 25mA-250mA BAT SW/OV RoHS:否 制造商:STMicroelectronics 監(jiān)測電壓數(shù): 監(jiān)測電壓: 欠電壓閾值: 過電壓閾值: 輸出類型:Active Low, Open Drain 人工復(fù)位:Resettable 監(jiān)視器:No Watchdog 電池備用開關(guān):No Backup 上電復(fù)位延遲（典型值）:10 s 電源電壓-最大:5.5 V 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:UDFN-6 封裝:Reel |
| SP805LCP | 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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