II. Model Interpretation

PXI: 3U single slot, PXI Hybrid bus, compatible with PXI/PXIe

7852: Fifth generation (Virtex-5) mixed RIO; 5 = Fifth generation FPGA; 2 = 8AI + 8AO + 96DIO configuration

R: Reconfigurable I/O (reconfigurable I/O), onboard user-programmable FPGA

III. Technical Parameters (25℃)

1) FPGA Core

Model: Xilinx Virtex-5 LX50 (LX50 = 50K logic units)

Logic Resources: 48,000 flip-flops, 2,880 kbit block RAM, 64 18×18 multipliers

Clock: Maximum 200 MHz; I/O clock 40 MHz

Configuration: LabVIEW FPGA, supports online reconfiguration, partial reconfiguration

2) Analog Input (AI)

Channels: 8 single-ended / differential selectable

Resolution: 16 bits

Sampling Rate: Each channel independently 750 kS/s (multi-channel synchronous)

Voltage Range: ±10 V

Bandwidth: 300 kHz

Trigger: Independent trigger (level / window / slope) for each channel

3) Analog Output (AO)

Channels: 8 single-ended

Resolution: 16 bits

Update Rate: Each channel independently 1 MS/s

Voltage Range: ±10 V

Drive Capacity: ±5 mA

Setup Time: 10 μs (to ±0.01%)

4) Digital I/O (DIO)

Channels: 96 bidirectional TTL/CMOS, groupable

Rate: Maximum 40 MHz, supports bilateral edge sampling

Level: 3.3 V/5 V compatible, each channel drives 24 mA

Functions: Input / Output / Counter / PWM / Encoder / Custom Protocol

5) Memory and Bus

Onboard RAM: 256 KB (FPGA block RAM)

FIFO: AI 64 KB, AO 64 KB, DIO 32 KB

DMA: 3 channels, maximum 132 MB/s on PXI bus

Trigger: PXI trigger bus, RTSI, star trigger, synchronous **<25 ns**

6) Physical and Environmental

Size: 3U single slot (160 mm × 100 mm)

Connectors: 2×68-pin VHDCI (1 AI/AO, 1 DIO)

Power Supply: +3.3 V (1.8 A), +5 V (20 mA); Power consumption approximately 5 W

Temperature: 0 ℃ ~ 55 ℃ (standard); optional **−40 ℃ ~ 85 ℃**

Weight: Approximately 180 g

IV. Interface and Communication Configuration

1) Hardware Interface

Analog I/O: 68-pin VHDCI (J1), 8AI/8AO, differential support

Digital I/O: 68-pin VHDCI (J2), 96DIO, divided into 3 groups × 32 channels

Backplane: PXI local bus, trigger bus, RTSI, PXI_CLK10 (10 MHz)

Clock: Internal 40 MHz; supports external 10–40 MHz input, PXIe reference clock

2) Software and Drivers

Driver: NI-RIO, compatible with LabVIEW FPGA, Real-Time, Windows

Development Process:

FPGA side: Graphical programming of acquisition / control / protocol logic

Real-time / Host side: DMA transmission, data processing, upper computer interaction Supporting protocols: SPI, I2C, UART, CAN, custom parallel bus

VII. Core Functions

Integrated mixed-signal (8AI + 8AO + 96DIO)

Single-card synchronous implementation of analog acquisition, signal generation, and high-speed digital control, eliminating the need for multiple module wiring, suitable for compact systems.

Virtex-5 FPGA hard real-time processing (25 ns accuracy)

Board-mounted FPGA operates independently for closed-loop control, sequential logic, protocol parsing, without operating system delay, supporting microsecond-level HIL closed-loop.

Multiple-rate independent channels (750 kS/s AI, 1 MS/s AO)

Each channel can independently sample / update rate, independently trigger, supporting multi-rate mixed acquisition, suitable for complex signal scenarios.

96-channel high-speed DIO (40 MHz)

Can be configured as encoder interface, PWM output, high-speed pulse string, custom protocol, suitable for motion control, digital communication.

Precise synchronization and high-bandwidth transmission

Supports PXI trigger / RTSI / star trigger, multi-card synchronization < 25 ns; DMA streaming transmission, meeting high-speed continuous acquisition / generation requirements.

VI. Application Scenarios

Hardware-in-the-Loop (HIL) real-time simulation

Motor / inverter HIL, power electronics simulation, power supply control testing, microsecond-level closed-loop.

Industrial control and motion control

Multi-axis synchronous motion (encoder + pulse instructions), high-speed sorting line, custom PLC substitution, analog + digital interlock.

High-speed mixed-signal testing

Sensor array acquisition, analog circuit function verification, high-speed pulse testing, 16-bit high-precision signal generation.

Custom protocols and interface conversion

Military / aviation dedicated protocols, old equipment interface adaptation, SPI/I2C/CAN etc. protocol hardware implementation.

Research and equipment development

Laser control, ultrasonic testing, precise motion control, real-time signal processing prototype verification.

VII. Usage and Maintenance Instructions

1) Installation and Power On

Disconnect power, insert a single slot of the PXI/PXIe chassis, tighten the fixing screws, and ensure the chassis is reliably grounded.

Before powering on, check that the VHDCI cables have no short circuit / false connection, and separate the analog / digital cables for wiring.

Preheat for 15 minutes before performing precise tests to ensure stable timing and accuracy.

2) Wiring and Configuration

Cables: Shielded VHDCI cables, analog signals use differential lines, digital lines length ≤ 3 m.

Configuration: NI MAX recognizes the hardware; LabVIEW FPGA compilation clock constraint ≤ 40 MHz.

Debugging: First test the basic functions of AI/AO/DIO without load, then connect the load; Use FPGA probe to monitor signals in real time.

3) Daily Maintenance

Regularly clean the VHDCI connector, check the shielding layer, add a dust cap for long-term inactivity.

Calibration: Once a year, use NI calibration tools to verify the accuracy of AI/AO and DIO timing.

Firmware: Update NI-RIO driver and FPGA firmware to optimize performance and compatibility.