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参数资料
| 型号： | CAT825STDI-G |
| 厂商： | ON SEMICONDUCTOR |
| 元件分类： | 电源管理 |
| 英文描述： | 1-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO5 |
| 封装： | ROHS COMPLIANT AND HALOGEN FREE, MO-193, TSOT-23, 5 PIN |
| 文件页数： | 13/14页 |
| 文件大小： | 153K |
| 代理商： | CAT825STDI-G |
CAT823, CAT824, CAT825
Doc. No. MD-3027 Rev. C
8
2008 SCILLC. All rights reserved.
Characteristics subject to change without notice
WATCHDOG TIMER
The CAT823 and CAT824 provide a Watchdog input
(WDI).
The watchdog timer function forces RESET
(and RESET in the CAT824) signals active when the
WDI input does not have a transition from low-to-high
or high-to-low within 1.12 seconds. Timeout of the
watchdog starts when RESET
(RESET on the
CAT824) becomes inactive. If a transition occurs on
the WDI input pin prior to the watchdog time-out, the
watchdog timer is reset and begins to time-out again.
If the watchdog timer is allowed to time-out, then the
reset output(s) will go active for tRP and once released
will repeat the watchdog timeout process.
Figure 3 below shows a typical implementation of a
watchdog function. Any processor signal that repeats
dependant on the normal operation of the processor
or directed by the software operating on the processor
can be used to strobe the watchdog input. The most
reliable is a dedicated I/O output transitioned by a
specific software instruction.
The watchdog can be disabled by floating (or tri-
stating) the WDI input (see Figure 4). If the watchdog
is disabled the WDI pin will be pulled low for the first
7/8
th’s of the watchdog period (t
WD) and pulled high for
the last 1/8
th of the watchdog period. This pulling low
of the WDI input and then high is used to detect an
open or tri-state condition and will continue to repeat
until the WDI input is driven high or low.
For most efficient operation of devices with the
watchdog function the WDI input should be held low
the majority of the time and only strobed high as
required to reset the watchdog timer.
Figure 3. Watchdog Timer
Figure 4. Watchdog Disable Circuit
RESET
CAT823
PIC
C
DECODER
ADDRESS
VCC
GND
WDI
MR
MCLR
Supply
Voltage
C
OUTPUT
VCC
Tristate
150k
110k
RESET
CAT823
VCC
GND
WDI
MR
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相关代理商/技术参数 |
参数描述 |
|---|---|
| CAT825STDI-GT3 | 功能描述:监控电路 act low act hi/MR 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 |
| CAT825TSDI-G | 制造商:CATALYST 制造商全称:Catalyst Semiconductor 功能描述:System Supervisory Voltage Reset with Watchdog and Manual Reset |
| CAT825TSDI-GT3 | 功能描述:监控电路 SUP ACT LOW ACT HI MR 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 |
| CAT825TTDI-G | 制造商:CATALYST 制造商全称:Catalyst Semiconductor 功能描述:System Supervisory Voltage Reset with Watchdog and Manual Reset |
| CAT825TTDI-GT3 | 功能描述:监控电路 act low act hi/MR 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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