National Instruments NI sbRIO-960x - Manual (Page 19)

© National Instruments Corporation 19 NI sbRIO-960x
The network settings are restored. You can reconfigure the settings in MAX
from a computer on the same subnet. Refer to the Measurement &
Automation Explorer Help for more information about configuring the
device.
Note If the device is restored to the factory network settings, the LabVIEW run-time
engine does not load. You must reconfigure the network settings and reboot the device for
the LabVIEW run-time engine to load.
Integrated 3.3 V Digital I/O
The four 40-pin IDC headers, P2–P5, provide connections for
110 low-voltage DIO channels, 82 DGND, and eight +5 V voltage outputs.
The following figure represents a single DIO channel.
Figure 12. Circuitry of One 3.3 V DIO Channel
I/O Protection
The 33
Ω current-limiting posistor, R1, and the protection diodes, D1 and
D2, protect each DIO channel against externally applied voltages of ±20 V
and ESD events. The combination of R1 and D1 protects against
overvoltage, and the combination of R1 and D2 protects against
undervoltage. The resistance of R1 increases rapidly with temperature.
1 U1: 5 V to 3.3 V Level Shifter, SN74CBTD3384CDGV from Texas Instruments
2 D1 and D2: ESD Rated Protection Diodes, NUP4302MR6T1G from On Semiconductor
3 R1: Current-Limiting Posistor, PRG18BB330MS1RB from Murata
User
Connection
Spartan III FPGA U1
+5 V
D2
D1
R1