National Instruments 187970E-01 Manuale utente

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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

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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

10 12

13 15

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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

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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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©National Instruments Corporation 9 8-Slot PXI Backplane Installation Guide

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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