National Instruments 700 User Manual
Also see for DAQCard-700: User manual
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Contents
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© National Instruments Corporation D-1 DAQCard-700 User ManualAppendix DPower-Management ModesThis appendix describes the power-management modes of the DAQCard-700.• Normal Mode—This is the normal operating mode of the DAQCard-700 in which all thecircuits are fully functional. This mode draws about 100 mA from the 5 V supply (about500 mW).• Power-Down Mode—In this mode, the digital circuitry is powered on and is functional. Theanalog input circuits are powered down by setting the PWRDOWN bit in the PC CardConfiguration and Status Register. You can set the PWRDOWN bit by using the DAQPOWERutility that is shipped with NI-DAQ. Use DAQPOWER-D to power down and DAQPOWER-Uto power up the DAQCard-700. This utility is also available in Windows and is installedwhenever you install NI-DAQ. Typically, the analog supplies are not reduced to zero;negligible power is supplied to the analog circuits. This mode draws about 70 mA from the 5V supply (about 350 mW).Table D-1 shows the effects of different power-management modes on the DAQCard-700circuits.Table D-1. DAQCard-700 Power-Management ModesNormal Mode Power-Down ModeAnalogInputFunctional. Defaults to bipolar(±10 V) RSE. Protected to±30 V. Impedance > 1 GΩ.Nonfunctional. Drawsnegligible power. Protectedto ±30 V. Impedance = 4.7 kΩ,which is the input protectionresistance.CalibrationCircuitryFunctional. Offset and Gainvalues can be read from the cardinformation structure.Functional. Offset and Gainvalues can be read from the cardinformation structure.Digital I/O Functional. Digital Outputdefaults to 0. Protected from-0.5 to 5.5 V.Functional. Digital Outputdefaults to 0. Protected from-0.5 to 5.5 V.Counters Functional. Initialize toundefined states. Individualcounters of the 82C54 must befully programmed before use.Protected from -0.5 to 5.5 V.Functional. Initialize toundefined states. Individualcounters of the 82C54 must befully programmed before use.Protected from -0.5 to 5.5 V. |
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