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© National Instruments Corporation 17 USB-6008/6009 User Guide and Specifications
National Instruments has several signal conditioning solutions for
digital applications requiring high current drive.
• If you configure a DIO line as an input, do not drive the line with
voltages outside of its normal operating range. The DIO lines have a
smaller operating range than the AI signals.
• Treat the DAQ device as you would treat any static sensitive device.
Always properly ground yourself and the equipment when handling
the DAQ device or connecting to it.
Power-On States
At system startup and reset, the hardware sets all DIO lines to
high-impedance inputs. The DAQ device does not drive the signal high or
low. Each line has a weak pull-up resistor connected to it.
Static DIO
Each of the USB-6008/6009 DIO lines can be used as a static DI or DO
line. You can use static DIO lines to monitor or control digital signals. All
samples of static DI lines and updates of DO lines are software-timed.
Event Counter
You can configure PFI 0 as a source for a gated invertor counter input edge
count task. In this mode, falling-edge events are counted using a 32-bit
counter. For more information about event timing requirements, refer to the
Specifications section.
Reference and Power Sources
The USB-6008/6009 creates an external reference and supplies a power
source.
+2.5 External References
The USB-6008/6009 creates a high-purity reference voltage supply for
the ADC using a multi-state regulator, amplifier, and filter circuit. The
resulting +2.5 V reference voltage can be used as a signal for self test.
+5 V Power Source
The USB-6008/6009 supplies a 5 V, 200 mA output. This source can be
used to power external components.
Note While the device is in USB suspend, the output is disabled.