B&B Electronics PC Watchdog Timer Card ATRWDT Manual do Utilizador descarregar pdf (Página 21)

P104-WDG-CSM User Manual

Chapter 6: Specification

Watchdog Timer

• Time-out: Software selectable from 2 sec. to 2060 sec

• Pulse Width: Output, 120 nsec. Minimum, 31 msec. Maximum

• Clock: 2.08333 MHz, derived from computer clock (33 MHz÷16)

• Address: 8-Bit I/O Mapped

Status Monitor Register

• Voltages IRQ and register indication if +5, +12, or -12 varies by more than +/-6%

• Temp. Alarm: IRQ and status register indication when above ~ 122°F (50°C)

• Temp. Digitizer: 8 bit ADC, LSB = 0.7 °F (0.39

• Isolated Outputs: Two, (customer supplied 5 - 24V) through a 330  resistor

• Isolated Inputs: Two, opto-isolated and current limited through 330 , one may be re-

assigned as External Reset

• Reset Outputs: Active low open collector, active high with 1k pull-up

• Fan Speed: IRQ and Status Register indication if speed is too high or too low

Environmental

• Operating Temp.: 0 to 70C (-40 °C to +85 °C option)

• Storage Temp.: -50 °C to +120 °C

• Humidity: 10% to 90% RH, non-condensing

• Power Required: +5 VDC at 125 mA typical

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B&B Electronics PC Watchdog Timer Card ATRWDT Manual do Utilizador Página 21