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参数资料
| 型号： | CAT706TZI-GT3 |
| 元件分类： | 电源管理 |
| 英文描述： | 1-CHANNEL POWER SUPPLY MANAGEMENT CKT, PDSO8 |
| 封装： | 3 X 3 MM, ROHS COMPLIANT, MO-187, MSOP-8 |
| 文件页数： | 13/14页 |
| 文件大小： | 374K |
| 代理商： | CAT706TZI-GT3 |
CAT705, CAT706, CAT813
Doc. No. MD-3030 Rev. A
8
Catalyst Semiconductor, Inc.
Characteristics subject to change without notice
WATCHDOG TIMER
The CAT705, CAT706, & CAT813 provide a
Watchdog input (WDI). The watchdog timer function
forces RESET
(and RESET in the CAT813) 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 CAT813) 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.
PIC
C
DECODER
ADDRESS
MCLR
WDO
PFO
VCC
WDI
GND
PFI
MR
RESET/RESET
CAT705
CAT706
CAT813
Figure 3. Watchdog Timer
Figure 4. Watchdog Disable Circuit
C
OUTPUT
VCC
Tristate
150k
110k
WDO
PFO
VCC
WDI
GND
PFI
MR
RESET/RESET
CAT705
CAT706
CAT813
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相关代理商/技术参数 |
参数描述 |
|---|---|
| CAT706VGI | 制造商:Rochester Electronics LLC 功能描述: 制造商:Catalyst Semiconductor 功能描述: |
| CAT706VI-G | 制造商:CATALYST 制造商全称:Catalyst Semiconductor 功能描述:レP Supervisory Circuits |
| CAT706VI-GT3 | 功能描述:监控电路 MPU SUPR CIRCUIT 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 |
| CAT706ZGI | 制造商:Catalyst Semiconductor 功能描述: |
| CAT706ZI-G | 制造商:ONSEMI 制造商全称:ON Semiconductor 功能描述:μP Supervisory Circuits |
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