National Instruments sbRIO-9601 User manual

National Instruments sbRIO-9602 Manual
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USER GUIDE
NI sbRIO-9601/9602 and
NI sbRIO-9602XT
Single-Board RIO OEM Devices
This document provides dimensions, pinouts, connectivity information,
and specifications for the National Instruments sbRIO-9601, sbRIO-9602,
and sbRIO-9602XT. The devices are referred to inclusively in this
document as the NI sbRIO-9601/9602/9602XT.
Caution The NI sbRIO-9601/9602/9602XT must be installed inside a suitable enclosure
prior to use. Hazardous voltages may be present.
Caution National Instruments makes no product safety, electromagnetic compatibility
(EMC), or CE marking compliance claims for NI sbRIO devices. The end-product supplier
is responsible for conformity to any and all compliance requirements.
Caution Exercise caution when placing the NI sbRIO device inside an enclosure.
Auxiliary cooling may be necessary to keep the device under the maximum ambient
temperature rating for the NI sbRIO device. Refer to Specifications section for more
information about the maximum ambient temperature rating.
Figure 1 shows the NI sbRIO-9601/9602/9602XT.
Figure 1. NI sbRIO-9601/9602/9602XT

NI sbRIO-9601/9602/9602XT User Guide 2 ni.com
What You Need to Get Started
This section lists the software and hardware you need to start programming
the NI sbRIO device.
Software Requirements
You need a development computer with the following software installed
on it. Go to ni.com/info and enter the Info Code rdsoftwareversion
for information about software version compatibility.
❑LabVIEW
❑LabVIEW Real-Time Module
❑LabVIEW FPGA Module
❑NI-RIO
Hardware Requirements
You need the following hardware to use the NI sbRIO device.
❑NI sbRIO-9601/9602/9602XT
❑19–30 VDC power supply
❑Ethernet cable
Dimensions
This section contains dimensional drawings of the NI sbRIO devices. For
three-dimensional models, refer to the Resources tab of the NI sbRIO
product page at ni.com.
Note The plated mounting holes are all connected to P1, the ground lug. Connect P1 or
one of the plated mounting holes securely to earth ground. Refer to the Understanding
Ground Connections section for cautions about current loops through the grounding lug.

©National Instruments Corporation 3 NI sbRIO-9601/9602/9602XT User Guide
Figure 2 shows the dimensions of the NI sbRIO-9601/9602/9602XT.
Figure 2. NI sbRIO-9601/9602/9602XT Dimensions in Inches (Millimeters)
0.651 (16.54)
8.200 (208.28)
3.650 (92.71)
0.000 (0)
0.000 (0)
0.775 (19.69)
4.100 (104.14) 7.295 (185.29)
2.237 (56.81) 5.147 (130.72) 8.076 (205.13) 3.691 (93.75)
0.550 (13.97)
0.275 (6.99)
2.440 (61.98)
3.520 (89.41)
3.520 (89.41)
0.450 (11.43)
7X Ø 0.134 (3.4)
0.140 (3.56)
0.080 (2.03)
0.000 (0)
0.327 (8.31)
0.469 (11.91)
8.200 (208.28)
0.000 (0)
0.286 (7.26)
0.940 (23.88) 1.107 (28.12) 2.091 (53.11)
4.017 (102.03) 5.001 (127.03) 6.927 (175.95) 7.911 (200.94)
8.200 (208.28)
0.000(0)
1.705 (43.31) 2.386 (60.61) 2.905 (73.79) 3.100 (78.74)
4.100 (104.14) 4.659 (118.33) 5.633 (143.07)
6.617 (168.06)
7.502 (190.55) 8.137 (206.68)
0.625 (15.88)
0.000 (0)
0.180 (4.57)
0.380 (9.65)
0.220 (5.59)
0.365 (9.28)
0.080 (2.03)
0.242 (6.16)
0.327 (8.31)
0.810 (20.57)
2X 4-40 THREADS
2 MM CLEARANCE REQUIRED
ABOVE THIS CAPACITOR
–0.110 (2.79)
MINIMUM CLEARANCE
NEEDED BELOW BOARD
2 MM CLEARANCE REQUIRED
ABOVE THIS CAPACITOR

NI sbRIO-9601/9602/9602XT User Guide 4 ni.com
You can install up to three board-only C Series I/O modules on the
NI sbRIO device. The following figure shows the dimensions of the
NI sbRIO-9601/9602/9602XT with three board-only C Series I/O modules
installed.
Figure 3. NI sbRIO-9601/9602/9602XT with C Series Modules,
Dimensions in Inches (Millimeters)
Note To maintain isolation clearances on the C Series modules, do not use mounting
hardware larger than 0.240 in. (6.1 mm) in diameter and maintain an air gap of at least
0.200 in. (5.0 mm) from the modules to anything else.
1.212 (30.78)
0.000 (0)
0.285 (7.23)
6.565 (166.75)
2.885 (73.28)
2.514 (63.86)
3.965 (100.71)
3.650 (92.71)
0.000 (0)
8.200 (208.28)
2.889 (73.38) 2.910 (73.91)
5.799 (147.29)
5.820 (147.83) 8.709 (221.21)
6.442 (163.63)
3.340 (84.84)
Ø 0.512 (13)
8X Ø 0.125 (3.18)
4.265 (108.33)
5.515 (140.08)
2 MM CLEARANCE REQUIRED
ABOVE THIS CAPACITOR

©National Instruments Corporation 5 NI sbRIO-9601/9602/9602XT User Guide
I/O and Other Connectors on the NI sbRIO Device
Figure 4 shows the locations of parts on the NI sbRIO device.
Figure 4. NI sbRIO-9601/9602/9602XT Parts Locator Diagram
1 J11, Connector for C Series Module 3
2P5,3.3V Digital I/O
3Plated Mounting Holes
4 J10, Connector for C Series Module 2
5P4,3.3V Digital I/O
6 J9, Connector for C Series Module 1
7DIPSwitches
8Backup Battery
9P2,3.3V Digital I/O
10 J5, RJ-45 Ethernet Port
11 J1, RS-232 Serial Port
12 Reset Button
13P1, Ground Lug
14 LEDs
15 J3, Power Connector
16 P3, 3.3V Digital I/O
11 1012131415
8
9
16
1 2 4
3 3 3
33
3
3
5 6 7
3

NI sbRIO-9601/9602/9602XT User Guide 6 ni.com
Table 1 lists and describes the connectors on NI sbRIO devices and the part
number and manufacturer of each connector. Refer to the manufacturer for
information about using and matching these connectors.
Table 1. NI sbRIO Connector Descriptions
Connector Description
Manufacturer and
Part Number
Recommended
Mating Connector
J3, Power 2-position MINI-COMBICON
header and plug,
0.285 in. (7.24 mm) high
Phoenix Contact,
1727566
Sauro,
CTF02BV8-BN
(included)
J1,
RS-232 Serial
Port
9-pin DSUB plug,
0.318 in. (8.08 mm) high,
with 4-40 jacksockets
Tyco Electronics,
5747840-6
—
P2, P3, P4, P5 50-pin polarized header plug,
0.100 ×0.100 in.
(2.54 ×2.54 mm)
3M, N2550-6002RB 3M, 8550-4500PL

©National Instruments Corporation 7 NI sbRIO-9601/9602/9602XT User Guide
The following figures show the pinouts of the I/O connectors on the
NI sbRIO devices.
Figure 5. Pinout of I/O Connector P2, 3.3 V Digital I/O
Port5/DIOCTL
Port5/DIO9
5 V
D GND
5 V
D GND
D GND
D GND
D GND
D GND
Port6/DIOCTL
D GND
D GND
D GND
D GND
D GND
D GND
D GND
D GND
D GND
D GND
D GND
D GND
D GND
D GND
D GND
Port5/DIO1
Port5/DIO2
Port5/DIO4
Port5/DIO5
Port5/DIO6
Port5/DIO7
Port5/DIO0
Port5/DIO3
Port5/DIO8
Port6/DIO9
Port6/DIO0
Port6/DIO1
Port6/DIO2
Port6/DIO3
Port6/DIO4
Port6/DIO5
Port6/DIO6
Port6/DIO7
Port6/DIO8
Port2/DIO4
Port2/DIO5
Port2/DIO6
Port2/DIO7
Port2/DIO8
50 49
48 47
46 45
44 43
42 41
40 39
38 37
36 35
34 33
32 31
30 29
28 27
26 25
24 23
22 21
20 19
18 17
16 15
14 13
12 11
10 9
8 7
6 5
4 3
2 1
Pin 1
Pin 50

NI sbRIO-9601/9602/9602XT User Guide 8 ni.com
Figure 6. Pinout of I/O Connector P3, 3.3 V Digital I/O
Port7/DIO4
D GND
D GND
D GND
D GND
Port8/DIOCTL
D GND
D GND
D GND
D GND
D GND
D GND
D GND
D GND
D GND
Port9/DIOCTL
D GND
D GND
D GND
D GND
D GND
5 V
D GND
5 V
D GND
D GND
Port7/DIO6
Port7/DIO7
Port8/DIO9
Port8/DIO0
Port8/DIO1
Port8/DIO2
Port7/DIO5
Port7/DIO8
Port8/DIO3
Port8/DIO4
Port8/DIO5
Port8/DIO6
Port8/DIO7
Port8/DIO8
Port9/DIO9
Port9/DIO0
Port9/DIO1
Port9/DIO2
Port9/DIO3
Port9/DIO4
Port9/DIO5
Port9/DIO6
Port9/DIO7
Port9/DIO8
50 49
48 47
46 45
44 43
42 41
40 39
38 37
36 35
34 33
32 31
30 29
28 27
26 25
24 23
22 21
20 19
18 17
16 15
14 13
12 11
10 9
8 7
6 5
4 3
2 1
Pin 1
Pin 50

©National Instruments Corporation 9 NI sbRIO-9601/9602/9602XT User Guide
Figure 7. Pinout of I/O Connector P4, 3.3 V Digital I/O
Port0/DIOCTL
Port0/DIO9
5 V
D GND
5 V
D GND
D GND
D GND
D GND
D GND
Port1/DIOCTL
D GND
D GND
D GND
D GND
D GND
D GND
D GND
D GND
D GND
Port2/DIOCTL
D GND
D GND
D GND
D GND
D GND
Port0/DIO1
Port0/DIO2
Port0/DIO4
Port0/DIO5
Port0/DIO6
Port0/DIO7
Port0/DIO0
Port0/DIO3
Port0/DIO8
Port1/DIO9
Port1/DIO0
Port1/DIO1
Port1/DIO2
Port1/DIO3
Port1/DIO4
Port1/DIO5
Port1/DIO6
Port1/DIO7
Port1/DIO8
Port2/DIO9
Port2/DIO0
Port2/DIO1
Port2/DIO2
Port2/DIO3
50 49
48 47
46 45
44 43
42 41
40 39
38 37
36 35
34 33
32 31
30 29
28 27
26 25
24 23
22 21
20 19
18 17
16 15
14 13
12 11
10 9
8 7
6 5
4 3
2 1
Pin 1
Pin 50

NI sbRIO-9601/9602/9602XT User Guide 10 ni.com
Figure 8. Pinout of I/O Connector P5, 3.3 V Digital I/O
Figure 9 shows the signals on J1, the RS-232 serial port.
Figure 9. J1, RS-232 Serial Port Pin Assignments
Port7/DIOCTL
Port7/DIO9
D GND
D GND
D GND
Port3/DIOCTL
D GND
D GND
D GND
D GND
D GND
D GND
D GND
D GND
D GND
Port4/DIOCTL
D GND
D GND
D GND
D GND
D GND
5 V
D GND
5 V
D GND
D GND
Port7/DIO1
Port7/DIO2
Port3/DIO9
Port3/DIO0
Port3/DIO1
Port3/DIO2
Port7/DIO0
Port7/DIO3
Port3/DIO3
Port3/DIO4
Port3/DIO5
Port3/DIO6
Port3/DIO7
Port3/DIO8
Port4/DIO9
Port4/DIO0
Port4/DIO1
Port4/DIO2
Port4/DIO3
Port4/DIO4
Port4/DIO5
Port4/DIO6
Port4/DIO7
Port4/DIO8
50 49
48 47
46 45
44 43
42 41
40 39
38 37
36 35
34 33
32 31
30 29
28 27
26 25
24 23
22 21
20 19
18 17
16 15
14 13
12 11
10 9
8 7
6 5
4 3
2 1
Pin 1
Pin 50
DSR
RTS
CTS
RI
DCD
RXD
TXD
DTR
GND
1
2
3
4
5
6
7
8
9

©National Instruments Corporation 11 NI sbRIO-9601/9602/9602XT User Guide
Understanding Ground Connections
All of the grounds (D GND, ground lug P1, and the plated mounting holes)
are connected together internally on the NI sbRIO device. The ESD
protection diodes are connected to the plated mounting holes with a lower
inductive path than the path to D GND, so the best ESD protection is
provided by connecting the plated mounting holes and ground lug P1 to a
low inductive earth ground.
Care must be taken to not connect the grounds in such a way that stray
power supply currents traverse through the board. A good rule of thumb is
current flowing out of the connector should match current flowing in.
To verify correct grounding of the NI sbRIO device, make sure current
flowing into the power connector J3 equals the current flowing out of power
connector J3. These currents should be measured with a current probe after
final assembly of the end product and any current differences investigated
and removed.
All external power supplies should have their connected to a system ground
external to the NI sbRIO device. Do not use the NI sbRIO device as the
common system grounding point. Significant currents traversing through
the NI sbRIO grounds can result in digital component failures. If more than
3 A flows through the common (–) pin on the J3 power connector,
components start to fuse open.
Connecting the NI sbRIO Device to a Network
Use a standard Category 5 (CAT-5) or better Ethernet cable to connect the
RJ-45 Ethernet port to an Ethernet network.
Caution To prevent data loss and to maintain the integrity of your Ethernet installation,
do not use a cable longer than 100 m.
If you need to build your own cable, refer to the Cabling section for more
information about Ethernet cable wiring connections.
The host computer communicates with the device over a standard Ethernet
connection. If the host computer is on a network, you must configure
the device on the same subnet as the host computer. If neither the host
computer nor the device is connected to a network, you can connect the
two directly using a crossover cable.
If you want to use the device on a subnet other than the one the host
computer is on, first connect the device on the same subnet as the host
computer. Use DHCP to assign an IP address or reassign a static IP address

NI sbRIO-9601/9602/9602XT User Guide 12 ni.com
for the subnet where you want it to be and physically move it to the other
subnet. Refer to the Measurement & Automation Explorer Help for more
information about configuring the device in Measurement & Automation
Explorer (MAX).
Powering the NI sbRIO Device
The NI sbRIO device requires a power supply connected to J3. The
supply voltage and current must meet the specifications in the Power
Requirements section of this document, but the actual power requirement
depends on how the device is physically configured, programmed, and
used. To determine the power requirement of your application, you must
measure the power consumption during execution, and add 20% to your
estimates to account for transient and startup conditions.
Note Select a high-quality power supply with less than 20 mV ripple. The NI sbRIO
device has some internal power-supply filtering on the positive side, but a low-quality
power supply can inject noise into the ground path, which is unfiltered.
Four elements of the NI sbRIO device can require power: sbRIO internal
operation; 3.3 V DIO; 5 V output; and board-only C Series modules
installed on the device. Refer to the Power Requirements section for
formulas and examples for calculating power requirements for different
configurations and application types.
Complete the following steps to connect a power supply to the device.
Refer to Figure 10 for an illustration of the power supply connections.
Figure 10. Connecting a Power Supply
V
C
Common
(–)
Voltage
(+)

©National Instruments Corporation 13 NI sbRIO-9601/9602/9602XT User Guide
1. Remove the MINI-COMBICON plug from connector J3 of the
NI sbRIO device. Refer to Figure 4 for the location of J3.
2. Connect the positive lead of the power supply to the V terminal of
the MINI-COMBICON plug.
3. Connect the negative lead of the power supply to the C terminal of
the MINI-COMBICON plug.
4. Re-install the MINI-COMBICON connector in connector J3.
Powering On the NI sbRIO Device
The NI sbRIO device runs a power-on self test (POST) when you apply
power to the device. During the POST, the Power and Status LEDs turn on.
When the Status LED turns off, the POST is complete. If the LEDs do not
behave in this way when the system powers on, refer to the Understanding
LED Indications section.
You can configure the device to launch an embedded stand-alone
LabVIEW RT application each time it is booted. Refer to the Running a
Stand-Alone Real-Time Application (RT Module) topic of the LabVIEW
Help for more information.
Boot Options
Table 2 lists the reset options available on NI sbRIO devices. These options
determine how the FPGA behaves when the device is reset in various
conditions. Use the RIO Device Setup utility to select reset options. Access
the RIO Device Setup utility by selecting Start»All Programs»National
Instruments»NI-RIO»RIO Device Setup.
Note If you want a VI to run when loaded to the FPGA, complete the following steps.
1. Right-click the FPGA Target item in the Project Explorer window in
LabVIEW.
2. Select Properties.
Table 2. NI sbRIO Reset Options
Reset Option Behavior
Do not autoload VI Does not load the FPGA bit stream from flash memory.
Autoload VI on device powerup Loads the FPGA bit stream from flash memory to the FPGA
when the device powers on.
Autoload VI on device reboot Loads the FPGA bit stream from flash to the FPGA when you
reboot the device either with or without cycling power.

NI sbRIO-9601/9602/9602XT User Guide 14 ni.com
3. In the General category of the FPGA Target Properties dialog box,
place a check in the Run when loaded to FPGA checkbox.
4. Compile the FPGA VI.
Connecting Serial Devices to the NI sbRIO Device
The NI sbRIO device has an RS-232 serial port to which you can connect
devices such as displays or input devices. Use the Serial VIs to read from
and write to the serial port from a LabVIEW RT application. For more
information about using the Serial VIs, refer to the Serial VIs and
Functions topic of the LabVIEW Help.
Using the Internal Real-Time Clock
The system clock of the NI sbRIO device gets the date and time from the
internal real-time clock at startup. This synchronization provides
timestamp data to the device.
Configuring DIP Switches
Figure 11. DIP Switches
All of the DIP switches are in the OFF (up) position when the NI sbRIO
device is shipped from National Instruments.
SAFE MODE Switch
The position of the SAFE MODE switch determines whether the embedded
LabVIEW Real-Time engine launches at startup. If the switch is in the OFF
position, the LabVIEW Real-Time engine launches. Keep this switch in the
OFF position during normal operation. If the switch is in the ON position
at startup, the sbRIO device launches only the essential services required
for updating its configuration and installing software. The LabVIEW
Real-Time engine does not launch.
1SAFE MODE
2CONSOLE OUT
3IP RESET
4 NO APP
5USER1
6 NO FPGA
AMP 0650
1-5435802-7
OFF

©National Instruments Corporation 15 NI sbRIO-9601/9602/9602XT User Guide
Push the SAFE MODE switch to the ON position if the software on the
sbRIO device is corrupted. Even if the switch is not in the ON position, if
there is no software installed on the device, the device automatically boots
into safe mode. The SAFE MODE switch must be in the ON position to
reformat the drive on the device. Refer to the Measurement & Automation
Explorer Help for more about installing software and reformatting the
drive.
CONSOLE OUT Switch
With a serial-port terminal program, you can use the serial port to read
the IP address and firmware version of the NI sbRIO device. Use a
null-modem cable to connect the serial port on the device to a computer.
Push the CONSOLE OUT switch to the ON position. Make sure that the
serial-port terminal program is configured to the following settings:
• 9,600 bits per second
• Eight data bits
• No parity
• One stop bit
• No flow control
Keep this switch in the OFF position during normal operation. If
CONSOLE OUT is enabled, LabVIEW RT cannot communicate with the
serial port.
IP RESET Switch
Push the IP RESET switch to the ON position and reboot the NI sbRIO
device to reset the IP address to 0.0.0.0. If the device is on your local
subnet and the IP RESET switch is in the ON position, the device appears
in MAX with IP address 0.0.0.0. You can configure a new IP address for
the device in MAX. Refer to the Resetting the Network Configuration of the
NI sbRIO Device section for more information about resetting the IP
address.
NO APP Switch
Push the NO APP switch to the ON position to prevent a LabVIEW RT
startup application from running at startup. If you want to permanently
disable a LabVIEW RT application from running at startup, you must
disable it in LabVIEW. To run an application at startup, push the NO APP
switch to the OFF position, create an application using the LabVIEW
Application Builder, and configure the application in LabVIEW to launch
at startup. For more information about automatically launching VIs at

NI sbRIO-9601/9602/9602XT User Guide 16 ni.com
startup and disabling VIs from launching at startup, refer to the Running a
Stand-Alone Real-Time Application (RT Module) topic of the LabVIEW
Help.
USER1 Switch
You can define the USER1 switch for your application. To define the
purpose of this switch in your embedded application, use the RT Read
Switch VI in your LabVIEW RT embedded VI. For more information
about the RT Read Switch VI, refer to the LabVIEW Help.
NO FPGA Switch
Push the NO FPGA switch to the ON position to prevent a LabVIEW
FPGA application from loading at startup. The NO FPGA switch overrides
the options described in the Boot Options section. After startup you can
download bit files to flash memory from a LabVIEW project regardless of
switch position. If you already have an application configured to launch at
startup and you push the NO FPGA switch from ON to OFF, the startup
application is automatically enabled.
Using the Reset Button
Pressing the Reset button reboots the processor. The FPGA continues to
run unless you select the Autoload VI on device reboot boot option. Refer
to the Boot Options section for more information.
Understanding LED Indications
Figure 12. NI sbRIO Device LEDs
1FPGA 2USER 3POWER 4STATUS
3
1
4
2

©National Instruments Corporation 17 NI sbRIO-9601/9602/9602XT User Guide
FPGA LED
You can use the FPGA LED to help debug your application or easily
retrieve application status. Use the LabVIEW FPGA Module and NI-RIO
software to define the FPGA LED to meet the needs of your application.
Refer to LabVIEW Help for information about programming this LED.
USER LED
You can define the USER LED to meet the needs of your application. To
define the LED, use the RT LEDs VI in LabVIEW. For more information
about the RT LEDs VI, refer to the LabVIEW Help.
POWER LED
The POWER LED is lit while the NI sbRIO device is powered on. This
LED indicates that the 5 V and 3.3 V rails are stable.
STATUS LED
The STATUS LED is off during normal operation. The NI sbRIO device
indicates specific error conditions by flashing the STATUS LED a certain
number of times as shown in Table 3.
Table 3. Status LED Indications
Number of
Flashes Indication
1
(one flash every
couple seconds)
The device is unconfigured. Use MAX to configure
the device. Refer to the Measurement & Automation
Explorer Help for information about configuring the
controller.
2The device has detected an error in its software. This
usually occurs when an attempt to upgrade the
software is interrupted. Reinstall software on the
device. Refer to the Measurement & Automation
Explorer Help for information about installing
software on the device.
3The device is in safe mode because the SAFE
MODE DIP switch is in the ON position. Refer
to the Configuring DIP Switches section for
information about the SAFE MODE DIP switch.

NI sbRIO-9601/9602/9602XT User Guide 18 ni.com
Resetting the Network Configuration
of the NI sbRIO Device
If the NI sbRIO device is not able to communicate with the network, you
can use the IP RESET switch to manually restore the device to the factory
network settings. When you restore the device to the factory network
settings, the IP address, subnet mask, DNS address, gateway, and Time
Server IP are set to 0.0.0.0. Power-on defaults, watchdog settings, and
VIs are unaffected.
Complete the following steps to restore the device to the factory network
settings.
1. Move the IP RESET DIP switch to the ON position.
2. Press the Reset button.
3. Move the IP RESET switch to the OFF position.
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.
4The device software has crashed twice without
rebooting or cycling power between crashes. This
usually occurs when the device runs out of memory.
Review your RT VI and check the device memory
usage. Modify the VI as necessary to solve the
memory usage issue.
Continuous
flashing or solid
The device has detected an unrecoverable error.
Format the hard drive on the device. If the problem
persists, contact National Instruments.
Table 3. Status LED Indications (Continued)
Number of
Flashes Indication

©National Instruments Corporation 19 NI sbRIO-9601/9602/9602XT User Guide
Integrated 3.3 V Digital I/O
The four 40-pin IDC headers, P2–P5, provide connections for
110 low-voltage DIO channels, 82 D GND, and eight +5 V voltage outputs.
The following figure represents a single DIO channel.
Figure 13. Circuitry of One 3.3 V DIO Channel
I/O Protection
The 33 Ωcurrent-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.
During overvoltage conditions, high current flows through R1 and into the
protection diodes. High current causes internal heating in the posistor,
which increases the resistance and limits the current. Refer to the
Specifications section for current-limiting and resistance values.
Drive Strength
The NI sbRIO devices are tested with all 110 DIO channels driving 3 mA
DC loads, for a total of 330 mA sourcing from the FPGA. The FPGA uses
minimum 8 mA drivers, but the devices are not characterized for loads
higher than 3 mA.
U1: 5 V to 3.3V Level Shifter, SN74CBTD3384CDGV from Texas Instruments
D1 and D2: ESD-Rated Protection Diodes, NUP4302MR6T1G from ON Semiconductor
R1: Current-Limiting Posistor, PRG18BB330MS1RB from Murata
User
Connection
Xilinx Spartan-3 FPGA U1
+5 V
D2
D1
R1