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P104-WDG-CSMA - PC/104+ Watchdog Timer, STBatus Monitor, Advanced

Acces I/O


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This product is RoHS-compliant

Please contact us if you require a non-RoHS version.

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PC/104-Plus Watchdog Timer card with computer status monitor and all available features populated. 40-pin right-angle shrouded 2x20 header, JP2, reset isolated input, 2-pin right-angle header with 0.1" spacing.

This multifunction card contains a watchdog timer used to monitor the operation of your application program and operating system to initiate a system reset in case of a lockup. It can also monitor and control a variety of system hardware parameters.


This advanced version builds on the P104-WDG-CSM but has all available features populated. Two undedicated 8-bit A/D (Analog Inputs) with a 0-5V range can be used to measure critical system parameters such as battery voltage or humidity. The fan speed control can be used in conjunction with the temperature monitor to maintain internal temperatures in the enclosure by the control of fan speed. The duty cycle of fan power (+12V) is pulse-width modulated to speed up the fan when temperature increases. If no current is detected or the duty cycle reaches 100%, an interrupt occurs. Another advanced feature is a Security Light Sensor used to detect if a darkened interior of the enclosure is opened letting in light. An external remote reset through a dedicated opto-isolated digital input is provided that can allow any transition between 3-18V to reset the computer. This reset could be triggered remotely from an RS-232 signal transition if available. Finally, additional fused 5V and 12V pins are provided on I/O connector for powering external circuitry or devices.