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.


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Omschrijving Prijs 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-stocknr. 686-7509
FabrikantnummerSTWD100NYWY3F
€ 0,742
Each (In a Pack of 5)
Aantal stuks
SOT-23 1 5 - - +125 °C - - 2.9 x 1.6 x 1.05mm 1.05mm 2.9mm - 1.6mm -40 °C
RS-stocknr. 168-6421
FabrikantnummerSTWD100NYWY3F
€ 0,323
Each (On a Reel of 3000)
Aantal stuks
SOT-23 1 5 - - +125 °C - - 2.9 x 1.6 x 1.05mm 1.05mm 2.9mm - 1.6mm -40 °C
RS-stocknr. 165-5639
FabrikantnummerSTWD100PYW83F
€ 0,436
Each (On a Reel of 3000)
Aantal stuks
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-stocknr. 165-5640
FabrikantnummerSTWD100YNPWY3F
€ 0,476
Each (On a Reel of 3000)
Aantal stuks
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-stocknr. 165-5301
FabrikantnummerSTWD100NWWY3F
€ 0,379
Each (On a Reel of 3000)
Aantal stuks
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-stocknr. 860-7479
FabrikantnummerSTWD100YNWWY3F
€ 0,695
Each (In a Pack of 10)
Aantal stuks
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-stocknr. 686-7506
FabrikantnummerSTWD100NPWY3F
€ 0,724
Each (In a Pack of 5)
Aantal stuks
SOT-23 - 5 - - +125 °C - - 2.9 x 1.6 x 1.05mm 1.05mm 2.9mm - 1.6mm -40 °C
RS-stocknr. 829-1513
FabrikantnummerSTWD100PYW83F
€ 0,613
Each (In a Pack of 10)
Aantal stuks
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-stocknr. 168-6420
FabrikantnummerSTWD100NPWY3F
€ 0,284
Each (On a Reel of 3000)
Aantal stuks
SOT-23 - 5 - - +125 °C - - 2.9 x 1.6 x 1.05mm 1.05mm 2.9mm - 1.6mm -40 °C
RS-stocknr. 165-5302
FabrikantnummerSTWD100YNWWY3F
€ 0,455
Each (On a Reel of 3000)
Aantal stuks
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-stocknr. 860-7435
FabrikantnummerSTWD100NWWY3F
€ 0,547
Each (In a Pack of 10)
Aantal stuks
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