Watchdog Timers

Watchdog timers (WDT) or sometimes referred to as computer operating properly or COP timer is a piece of hardware which can be found in embedded system applications but are an external component to the processor. Watchdog timers are commonly used in environments where human access is very limited or incapable of responding to faults in a timely mode, therefore, the system needs to be self-reliant if it hangs. An example would be a space probe, where human intervention is restricted when in operation if the device is unable to recover from malfunctions, it would become disabled.

What is the purpose of a Watchdog timer?

The purpose of the Watchdog timer (WDT) is to automatically detect pulse signals from a processor within a definite time period. The device will send a reset trigger if the system malfunctions or if the signal is not received and requires a reboot, this could occur because of software or hardware issues.

There are two ways in which a Watchdog Timer enable embedded system to be self-reliant:

By detecting system errors which can include programming errors, a surge of power, software loops or hanging and if code crashes.

By resetting operating systems and continuing normal program actions through the reset signal which is embedded in a Central Processor Unit (CPU) or Microcontroller.

What is a typical application of a Watchdog timer?

A watchdog timer (WDT) is used in everyday applications, such as digital TVs, washing machines, vacuum cleaner, microwaves, drones, grid metering to motor control systems such as cruise control, smartphones to name a few. Within all these devices, the functionality of a Watchdog Timer will provide the same or similar purposes.


...
อ่านเพิ่มเติม อ่านน้อยกว่า

คัดกรอง / Filters

กำลังดูสินค้า 1 - 15 รายการจาก 15 รายการ / Viewing 1 - 15 of 15 products
ผลการค้นหาต่อหน้า / Results Per Page
รายละเอียดสินค้า / Description ราคา / Price Package Type Number of Internal Timers Pin Count Minimum Operating Supply Voltage Maximum Operating Supply Voltage Maximum Operating Temperature Maximum Low Level Output Current Maximum High Level Output Current Dimensions Height Length Propagation Delay Test Condition Width Minimum Operating Temperature
RS Stock No. 686-7506
หมายเลขชิ้นส่วนของผู้ผลิต / Mfr. Part No.STWD100NPWY3F
THB23.656
Each: (In a Pack of 5)
Units
SOT-23 - 5 - - +125 °C - - 2.9 x 1.6 x 1.05mm 1.05mm 2.9mm - 1.6mm -40 °C
RS Stock No. 900-9863
หมายเลขชิ้นส่วนของผู้ผลิต / Mfr. Part No.TPL5010DDCT
THB26.646
Each: (In a Pack of 5)
Units
SOT-23 1 6 1.8 V 5.5 V +105 °C -1mA 1mA 3.05 x 1.75 x 1mm 1mm 3.05mm 50pF 1.75mm -40 °C
RS Stock No. 165-5639
หมายเลขชิ้นส่วนของผู้ผลิต / Mfr. Part No.STWD100PYW83F
THB10.588
Each (On a Reel of 3000)
Units
SOT-323 1 5 2.7 V 5.5 V +125 °C - - 2.2 x 1.35 x 1mm 1mm 2.2mm - 1.35mm -40 °C
RS Stock No. 686-7509
หมายเลขชิ้นส่วนของผู้ผลิต / Mfr. Part No.STWD100NYWY3F
THB24.244
Each: (In a Pack of 5)
Units
SOT-23 1 5 - - +125 °C - - 2.9 x 1.6 x 1.05mm 1.05mm 2.9mm - 1.6mm -40 °C
RS Stock No. 900-9867
หมายเลขชิ้นส่วนของผู้ผลิต / Mfr. Part No.TPL5110DDCT
THB28.54
Each: (In a Pack of 5)
Units
SOT-23 1 6 1.8 V 5.5 V +105 °C -1mA 1mA 3.05 x 1.75 x 1mm 1mm 3.05mm 50pF 1.75mm -40 °C
RS Stock No. 162-9881
หมายเลขชิ้นส่วนของผู้ผลิต / Mfr. Part No.TPL5110DDCT
THB17.204
Each (On a Reel of 250)
Units
SOT-23 1 6 1.8 V 5.5 V +105 °C -1mA 1mA 3.05 x 1.75 x 1mm 1mm 3.05mm 50pF 1.75mm -40 °C
RS Stock No. 168-6420
หมายเลขชิ้นส่วนของผู้ผลิต / Mfr. Part No.STWD100NPWY3F
THB8.94
Each (On a Reel of 3000)
Units
SOT-23 - 5 - - +125 °C - - 2.9 x 1.6 x 1.05mm 1.05mm 2.9mm - 1.6mm -40 °C
RS Stock No. 860-7435
หมายเลขชิ้นส่วนของผู้ผลิต / Mfr. Part No.STWD100NWWY3F
THB21.726
Each: (In a Pack of 10)
Units
SOT-23 1 5 2.7 V 5.5 V +125 °C - - 3 x 1.75 x 1.3mm 1.3mm 3mm - 1.75mm -40 °C
RS Stock No. 829-1513
หมายเลขชิ้นส่วนของผู้ผลิต / Mfr. Part No.STWD100PYW83F
THB19.712
Each: (In a Pack of 10)
Units
SOT-323 1 5 2.7 V 5.5 V +125 °C - - 2.2 x 1.35 x 1mm 1mm 2.2mm - 1.35mm -40 °C
RS Stock No. 860-7479
หมายเลขชิ้นส่วนของผู้ผลิต / Mfr. Part No.STWD100YNWWY3F
THB21.413
Each: (In a Pack of 10)
Units
SOT-23 1 5 2.7 V 5.5 V +125 °C - - 3 x 1.75 x 1.3mm 1.3mm 3mm - 1.75mm -40 °C
RS Stock No. 165-5640
หมายเลขชิ้นส่วนของผู้ผลิต / Mfr. Part No.STWD100YNPWY3F
THB11.828
Each (On a Reel of 3000)
Units
SOT-23 1 5 2.7 V 5.5 V +125 °C - - 3 x 1.75 x 1.3mm 1.3mm 3mm - 1.75mm -40 °C
RS Stock No. 168-6421
หมายเลขชิ้นส่วนของผู้ผลิต / Mfr. Part No.STWD100NYWY3F
THB10.419
Each (On a Reel of 3000)
Units
SOT-23 1 5 - - +125 °C - - 2.9 x 1.6 x 1.05mm 1.05mm 2.9mm - 1.6mm -40 °C
RS Stock No. 165-5302
หมายเลขชิ้นส่วนของผู้ผลิต / Mfr. Part No.STWD100YNWWY3F
THB12.148
Each (On a Reel of 3000)
Units
SOT-23 1 5 2.7 V 5.5 V +125 °C - - 3 x 1.75 x 1.3mm 1.3mm 3mm - 1.75mm -40 °C
RS Stock No. 162-9880
หมายเลขชิ้นส่วนของผู้ผลิต / Mfr. Part No.TPL5010DDCT
THB17.204
Each (On a Reel of 250)
Units
SOT-23 1 6 1.8 V 5.5 V +105 °C -1mA 1mA 3.05 x 1.75 x 1mm 1mm 3.05mm 50pF 1.75mm -40 °C
RS Stock No. 165-5301
หมายเลขชิ้นส่วนของผู้ผลิต / Mfr. Part No.STWD100NWWY3F
THB9.082
Each (On a Reel of 3000)
Units
SOT-23 1 5 2.7 V 5.5 V +125 °C - - 3 x 1.75 x 1.3mm 1.3mm 3mm - 1.75mm -40 °C
Related Products
The SCH3114 Super I/O Controller chip integrates many ...
Description:
The SCH3114 Super I/O Controller chip integrates many standard PC motherboard hardware functions into a single device. • Watchdog Timer • Resume and Main Power-Good Generator • Programmable Clock Output to 16Hz • 2.88MB Floppy Disk Controller for 2 x ...
The RX231 devices are 32-bit microcontrollers that can ...
Description:
The RX231 devices are 32-bit microcontrollers that can deliver up to 88.56DMIPS, support Floating Point maths operations and offer an extensive suite of on-board peripherals to suit general purpose applications. • 54MHz 32-bit RXv2 core microcontroller with FPU• Up to ...
The RX210 family of 32-bit low power microcontrollers ...
Description:
The RX210 family of 32-bit low power microcontrollers supports large capacity memory and up to 78DMIPS calculation speed. • 50MHz 32-bit RX core microcontroller• Up to 1MB Flash memory• 32-bit multiplier/divider with multiply-accumulate• 4-channel DMA controller (DMACA)• Data transfer ...
The PIC16(L)F184xx 8-bit product family features high resolution ...
Description:
The PIC16(L)F184xx 8-bit product family features high resolution Analog, Core Independent Peripherals (CIPs) and communication along with eXtreme Low-Power (XLP) technology for a wide range of general purpose and low-power applications. The family offers a 12-bit ADC with computation (ADC2), ...