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| 型号： | SP691ACT-L |
| 厂商： | Exar Corporation |
| 文件页数： | 12/24页 |
| 文件大小： | 0K |
| 描述： | IC SUPERVISOR MPU LP 16WSOIC |
| 标准包装： | 41 |
| 类型： | 简单复位/加电复位 |
| 监视电压数目： | 1 |
| 输出： | 开路漏极，推挽式 |
| 复位： | 高有效/低有效 |
| 复位超时： | 最小为 140 ms |
| 电压 - 阀值： | 4.65V |
| 工作温度： | 0°C ~ 70°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 16-SOIC（0.295"，7.50mm 宽） |
| 供应商设备封装： | 16-SOIC W |
| 包装： | 管件 |
| 其它名称： | SP691ACT-L-ND |
WDI
WDO
t 2
RESET
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
Figure 20. Watchdog Timeout Period and Reset Active Time
Watchdog Function
7
OSC IN
X No Connect
The watchdog monitors μ P activity via the
Watchdog Input (WDI). If the μ P becomes
inactive, RESET and RESET are asserted .
8
OSC SEL
X No Connect
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
1.6sec Normal Watchdog Timeout
Internal Oscillator
conditions. Refer to RESET and RESET
Outputs and Watchdog Output sections.
7
OSC IN
Watchdog Input
8
OSC SEL
X No Connect
A change of logic state (minimum 100ns
duration) at WDI during the watchdog period
will reset the watchdog timer. The watchdog
100ms Normal Watchdog Timeout
Internal Oscillator
default timout is 1.6sec.
C IN
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.
7
8
OSC IN
OSC SEL
External Oscillator
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.
Normal Watchdog Timeout = 600 x C IN [ms]
47pF
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
7
8
OSC IN
OSC SEL
reset threshold or when WDI is an open circuit.
In watchdog mode, if no transition occurs at
WDI during the watchdog-timeout period,
Normal Watchdog Timeout = 1024 Clock Periods
External Clock
Figure 21. Selecting Timeout Periods
Date: 4/18/05
SP691A/693A/800L/800M Low Power Microprocessor Supervisor with Battery Switch-Over ? Copyright 2005 Sipex Corporation
12
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相关代理商/技术参数 |
参数描述 |
|---|---|
| SP691ACT-L/TR | 功能描述:监控电路 LW PWR MICRO 5.5V 25mA-250mA BAT SW/OV RoHS:否 制造商:STMicroelectronics 监测电压数: 监测电压: 欠电压阈值: 过电压阈值: 输出类型:Active Low, Open Drain 人工复位:Resettable 监视器:No Watchdog 电池备用开关:No Backup 上电复位延迟（典型值）:10 s 电源电压-最大:5.5 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:UDFN-6 封装:Reel |
| SP691AEN | 制造商:SIPEX 制造商全称:Sipex Corporation 功能描述:Low Power Microprocessor Supervisory with Battery Switch-Over |
| SP691AEN/TR | 制造商:SIPEX 制造商全称:Sipex Corporation 功能描述:Low Power Microprocessor Supervisory with Battery Switch-Over |
| SP691AEN-L | 功能描述:监控电路 LW PWR MICRO 5.5V 25mA-250mA BAT SW/OV RoHS:否 制造商:STMicroelectronics 监测电压数: 监测电压: 欠电压阈值: 过电压阈值: 输出类型:Active Low, Open Drain 人工复位:Resettable 监视器:No Watchdog 电池备用开关:No Backup 上电复位延迟（典型值）:10 s 电源电压-最大:5.5 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:UDFN-6 封装:Reel |
| SP691AEN-L/TR | 功能描述:监控电路 LW PWR MICRO 5.5V 25mA-250mA BAT SW/OV RoHS:否 制造商:STMicroelectronics 监测电压数: 监测电压: 欠电压阈值: 过电压阈值: 输出类型:Active Low, Open Drain 人工复位:Resettable 监视器:No Watchdog 电池备用开关:No Backup 上电复位延迟（典型值）:10 s 电源电压-最大:5.5 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:UDFN-6 封装:Reel |
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