National Instruments 187970E-01 Manual de usuario
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INSTALLATION GUIDE
8-Slot PXI Backplane
This guide describes installation requirements for the 8-slot PXI backplane,
shown in Figure 1.
Figure 1. 8-Slot PXI Backplane
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Description
The 8-slot PXI backplane contains one PXI controller slot and 7 PXI
peripheral slots. It does not include a power supply or cooling solution. You
must implement these features when installing the backplane into your
system.
Mechanical Requirements
Mounting
Figure 2 shows the backplane dimensions. There are 22 holes available for
mounting with M2.5 hardware.
The use of all mounting holes is recommended for proper backplane
support.
There are two mounting holes on top of the 8-slot PXI backplane that have
plated annular pads on the front and back of the backplane. These mounting
holes may be used to connect the backplane ground to the chassis in which
the backplane is mounted. If you do not desire to connect backplane ground
to the chassis, use insulated washers at these mounting holes. Refer to
Figure 4 for the position of the mounting holes.
Cooling
Note National Instruments is not responsible for damage to the backplane if inadequate
cooling is used.
You should mount a fan below the backplane. Airflow should be from the
bottom to the top of the PXI modules. You must determine the airflow
requirements for your system based on the PXI Hardware Specification.
Handling
Cautions Be careful to avoid bending or otherwise damaging the pins on the backplane
connectors. Bent pins may cause functional failures or damage when the backplane is
powered.
To protect both yourself and the backplane from electrical hazards, leave the chassis
powered off until you finish installing the PXI controller and modules.
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©National Instruments Corporation 3 8-Slot PXI Backplane Installation Guide
Caution Electrostatic discharge can damage your equipment. To avoid such damage,
discharge the static built up on your body by touching a grounded metal object before
handling the PXI equipment. Then touch the antistatic plastic package containing the
backplane to a metal part of your PXI chassis before removing the backplane from the
packaging.
Dimensions
Figure 2. Dimensions
4.945
[125.60]
1.132
[28.752]
.142
[3.607]
.122
[3.100] .703
[17.856]
.800
[20.320]
9.336
[237.13]
.122
[3.100]
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Electrical Requirements
PXI Connectors
The PXI connectors (J11-J18, J2-J9) have pin descriptions defined in the
PXI hardware Specification. The connectors are shown in Figure 3.
Figure 3. PXI Connectors
System Reference Clock
The 8-Slot Backplane supplies the PXI 10 MHz system clock signal
(PXI_CLK10) independently to each peripheral slot. An independent
buffer (having a source impedance matched to the backplane and a skew of
less than 250 ps between slots) drives the clock signal to each peripheral
slot. You can use this common reference clock signal to synchronize
multiple modules in a measurement or control system. You can drive
PXI_CLK10 from an external source through the PXI_CLK10_IN pin
on the P2 connector of the Star Trigger Slot or 10 MHz IN pin on the J1
connector. Refer to the PXI Specification for the Pinout for the Star Trigger
Slot. Sourcing an external clock on either of these pins automatically
replaces the backplane’s 10 MHz source.
1 Slot 1 (Controller Slot) 2 Slot 2 (Star Trigger Slot) 3 Slots 3-8 (Peripheral Slots)
1 2 3
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©National Instruments Corporation 5 8-Slot PXI Backplane Installation Guide
Figure 4. Backplane Power and CLK10 Connectors
Power
Please refer to the PXI Hardware Specification for power requirements and
to the specifications of the chosen power supply to determine the minimum
load required.
Connector J20
Connector J20 is the power supply connector for the 8-slot backplane. The
location of the J20 connector is shown in Figure 4. Refer to Table 1 for the
pin descriptions. The mating connector for J20 is manufactured by Tyco
Electronics, and can be ordered with the part number 1648115-1.
Note The system slot (slot 1) receives +12 V power from pin 17 of J20. If this pin is not
connected to +12 V the system controller will not function properly.
1 Plated Mounting Holes (2x)
2 J1 (CLK10 Connector)
3 J20 (Power Connector)
4 J21 Connector
2
3
1
4
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Connector J1
Connector J1 is for interfacing with the backplane’s PXI_CLK10 circuitry.
The location of the J1 connector is shown in Figure 4. The mating
connector for J1 is manufactured by Positronic and can be ordered with the
part number CBD7W2M2000Z-759.1.
Table 1. Connector J20 Pin Descriptions
Connector Pin Signal Description
Required
for Basic
Power-up
1+3.3 V Backplane +3.3 V power plane. Yes
2GND Backplane ground plane. Yes
3+3.3 V Backplane +3.3 V power plane. Yes
4LED2 Connects to pin 8 of J21. No
5INHIBIT Connects to pin 7 of J21. No
6LED1 Connects to pin 5 of J21. No
7SMB_SDA Connects to pin C19 on J2 (slot 1). No
8SMB_ALERT# Connects to pin E19 on J2 (slot 1). No
9SMB_SCL Connects to pin D19 on J2 (slot 1). No
10 THERM1 (optional) Connects to pin 2 of J21. No
11 THERM2 (optional) Connects to pin 1 of J21. No
12 GND Backplane ground plane. Yes
13 GND Backplane ground plane. Yes
14 –12 V Backplane –12 V power plane. Yes
15 I2C_CLK Connects through R34 to pin A2 of J9. No
16 I2C_DAT Connects through R33 to pin B2 of J9. No
17 +12 V_FAN Separate +12 V for slot 1. Yes
18 GND Backplane ground plane. Yes
19 +12 V Backplane +12 V power plane. Yes
20 GND Backplane ground plane. Yes
21 +5 V Backplane +5 V power plane. Yes
22 GND Backplane ground plane. Yes
3
1
5
8
11
14
17
19
21
2
4
6
79
10 12
13 15
18
20
22
16
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©National Instruments Corporation 7 8-Slot PXI Backplane Installation Guide
Figure 5. J1 Connector
Connector J21
Connector J21 may be used in conjunction with J20 for interfacing with an
inhibit switch, LED, and thermistor. It is not necessary to connect to J21 for
basic power-up of the backplane. Refer to Table 2 for the pin descriptions.
The mating connector for pins 1–6 of J21 is manufactured by Molex and
can be ordered with the part number 22-01-2067.
Table 2. Connector J21 Pin Descriptions
Connector Pin Signal Description
1THERM2 Connects to pin 11 of J20
2THERM1 Connects to pin 10 of J20
3(No Pin) —
4NC Not connected.
5LED1 Connects to pin 6 of J20.
6+5V Connects to backplane’s +5V
power plane.
7INH Connects to pin 5 of J20.
8LED2 Connects to pin 4 of J20.
9GND Connects to backplane’s ground
plane.
Ground
10 MHz
OUT
10 MHz
IN
2
1
3
4
5
6
7
8
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Backplane
Size .........................................................3U-sized; one system slot (with
three system expansion slots)
and seven peripheral slots.
Compliant with IEEE 1101.10
mechanical packaging.
PXI Specification Revision 2.0
compliant. Accepts both PXI and
CompactPCI (PICMG 2.0 R 3.0)
3U modules.
Backplane bare-board material...............UL 94 V-0 Recognized
Backplane connectors .............................Conforms to IEC 917 and
IEC 1076-4-101, and are
UL 94 V-0 rated
RoHS ......................................................8-slot PXI backplane is
RoHS-compliant
10 MHz System Reference Clock (PXI_CLK10)
Maximum clock skew
between slots...........................................250 ps
Built-in 10 MHz clock
Accuracy..........................................±25 ppm (guaranteed over the
operating temperature range)
Maximum jitter................................5 ps RMS in 10 Hz to 1 MHz
range
External clock sources
Connectors.......................................Connector J1 on rear of backplane
(ground referenced) or Slot 2 J2
(pin D17)
Input frequency................................10 MHz ±100 ppm or better
Input amplitude
Rear connector..........................200 mVpp to 5 Vpp, 10 MHz
squarewave or sinewave
Slot 2 ........................................5 V or 3.3 V, 10 MHz TTL signal
Input impedance ..............................50 Ω±5Ω(rear connector)
Maximum jitter introduced
by backplane circuitry .....................1 ps RMS in 10 Hz to 1 MHz
range
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External clock output
Connector........................................ Connector J1 on rear of backplane
(ground-referenced)
Output amplitude ............................ 1 Vpp ±20% squarewave into 50 Ω
2 Vpp into open circuit
Output impedance ........................... 50 Ω±5Ω
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