- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄372191 > 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)）) PDF資料下載
參數(shù)資料
| 型號： | SP691A |
| 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)： | 12/23頁 |
| 文件大?。?/td> | 223K |
| 代理商： | SP691A |
SP691A DS/04 SP691A/693A/800L/800M Low Power Microprocessor Supervisor with Battery Switch-Over Copyright 2000 Sipex Corporation
12
Watchdog Function
The watchdog monitors
μ
P activity via the
Watchdog Input (WDI). If the
μ
P becomes
inactive, RESET and RESET are asserted
.
To use the watchdog function, connect WDI to
a bus line or
μ
P I/O line. If WDI remains high
or low for longer than the watchdog timeout pe-
riod (1.6s nominal). WDO, RESET, and RESET
are asserted, indicating a software fault or idle
conditions. Refer to
RESET and RESET
Outputs
and
Watchdog Output
sections.
Watchdog Input
A change of logic state (minimum 100ns
duration) at WDI during the watchdog period
will reset the watchdog timer. The watchdog
default timout is 1.6sec.
To disable the watchdog function, leave WDI
floating. An internal resistor network (100k
equivalent impedance at WDI) biases WDI to
approximately 1.6V. Internal comparators
detect this level and disable the watchdog timer.
When Vcc is below the reset threshold, the
watchdog function is disabled and WDI is
disconnected from its internal resistor network,
thus becoming high impedance.
Watchdog Output
WDO remains high if there is activity (transition
or pulse) at WDI during the watchdog-timeout
period. The watchdog function is disabled and
WDO is a logic high when V
CC
is less than the
reset threshold or when WDI is an open circuit.
In watchdog mode, if no transition occurs at
WDI during the watchdog-timeout period,
Figure 20. Watchdog Timeout Period and Reset Active Time
Figure 21. Selecting Timeout Periods
OSC
SEL
No Connect
X
No Connect
X
OSC
IN
7
8
OSC
SEL
No Connect
X
OSC
IN
7
8
OSC
SEL
OSC
IN
7
8
OSC
SEL
OSC
IN
7
8
1.6sec Normal Watchdog Timeout
Internal Oscillator
100ms Normal Watchdog Timeout
Internal Oscillator
Normal Watchdog Timeout = 647pF
External Oscillator
Normal Watchdog Timeout = 1024 Clock Periods
External Clock
IN
C
IN
t
2
t
1
t
1
t
3
t
1
= RESET Timeout Period
t
2
= Normal Watchdog Timeout Period
t
3
= Watchdog Timeout Period Immediately After RESET
WDI
WDO
RESET
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| 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 |
| SP703EN | Low Power Microprocessor Supervisory with Battery Switch-Over |
| SP703EP | 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 |
|---|---|
| SP691A_05 | 制造商:SIPEX 制造商全稱:Sipex Corporation 功能描述:Low Power Microprocessor Supervisory with Battery Switch-Over |
| SP691ACN | 制造商:SIPEX 制造商全稱:Sipex Corporation 功能描述:Evaluation Board Manual |
| SP691ACN/TR | 制造商:SIPEX 制造商全稱:Sipex Corporation 功能描述:Low Power Microprocessor Supervisory with Battery Switch-Over |
| SP691ACN-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 |
| SP691ACN-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 |
發(fā)布緊急采購，3分鐘左右您將得到回復(fù)。