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電子發燒友網>電子資料下載>類型>參考設計>CN0204軟件用戶指南

CN0204軟件用戶指南

2021-04-09 | pdf | 692.8KB | 次下載 | 2積分

資料介紹

This version (03 Jan 2021 21:59) was approved by Robin Getz.The Previously approved version (21 Sep 2017 18:51) is available.Diff

CN0204 Evaluation Board Guide

Overview

CN0204 is a full function, high voltage (up to 44 V), flexible, programmable analog output solution that meets most requirements for programmable logic controller (PLC) and distributed control system (DCS) applications. It provides all the typical voltage and current output ranges with 16-bit resolution and no missing codes, 0.05% linearity, and less than 0.2% total output error. Furthermore, it also contains key features for industrial applications, such as on-chip output fault detection, CRC checking to prevent packet error (PEC), and flexible power-up options, making it an ideal choice for robust industrial control systems. No external precision resistors or calibration routines are needed to maintain consistent performance in mass production, thereby making it ideal for PLC or DCS modules.

The AD5751 is a single channel, low cost, precision voltage/ current output driver developed to meet the requirements of industrial process control applications. The AD5751 is specified to operate with a power supply range from 10.8 V to 55 V, and the voltage output can be up to 44 V. The voltage output range can be programmed for the standard output ranges and 20% overrange settings for PLC and DCS applications: 0 V to 5 V, 0 V to 10 V, 0 V to 6 V, 0 V to 12 V. In addition, two high voltage output ranges are also provided: 0 V to 40 V and 0 V to 44 V. The current output, which is provided on a separate pin, can be programmed for the standard ranges of 4 mA to 20 mA, 0 mA to 20 mA, 0 mA to 24 mA. There is also a 2% overrange setting which provides 3.92 mA to 20.4 mA, 0 mA to 20.4 mA, and 0 mA to 24.5 mA. The voltage and current output pins can be tied together to configure the end system as a single-channel output if desired.

The AD5662 is a low power (0.75 mW typical @ 5 V), rail-to-rail output, 16-bit nanoDAC? device. The AD5662 guarantees ±1 LSB DNL under a wide range of reference voltages that can vary from 0.75 V to the VDD supply. In the circuit of Figure 1, the AD5751 and AD5662 operate from a common reference source of 4.096 V, provided by the ADR444.

The ADuM1301 and ADuM5401 provide all the necessary signal isolation between the microcontroller and the analog signal chain. They are both based on the iCoupler? technology. Additionally, the ADuM5401 provides an isolated 5 V power supply for all the circuit in the secondary side.

Devices for PLC and DCS applications generally need ESD protection and overvoltage protection much higher than the formal recommended specifications. Thus, external 64 V, 1500 W transient voltage suppressors (TVS); a 50 mA, 30 V PolySwitch; and power Schottky diodes are built into the EVAL-CN0204-SDPZ circuit board to provide higher voltage ESD protection, 50 mA overcurrent, and 64 V overvoltage protection.


Required Equipment


General Setup

Block Assignments

  • The EVAL-CN0204-SDPZ (CN0204 Board) connects to the EVAL-SDP-CB1Z (SDP-B Board) via the 120-Pin Connector (SDP CONN)
  • The EVAL-SDP-CB1Z (SDP-B Board) connects to the PC via the USB cable
  • Terminal block CN1 is the current output
  • Terminal block CN2 is the +6 V power supply input
  • Terminal block CN3 is the +/- 50 V power supply input
    • Connect the +25 V power supply to the 12-50 VIN terminal
    • Connect the -25 V power supply to the GND_ISO terminal
  • Terminal block CN4 is the voltage output
    • Optionally if JP3 is open, the output voltage feedback can be configured by connecting VSENSE+ to a selected node in the load circuit

Power on the (EVAL-CN0204-SDPZ) through the triple output power supply and the (SDP-B Board) through the PC SEPARATELY before connecting the two boards together.

Jumper Settings

See the table in the image below for the jumper settings. Values in red are the default settings for the EVAL-CN0204-SDPZ.


Installing the Evaluation Software

  1. Extract the file CN0204 Evaluation Software and open setup.exe

    NOTE: It is recommended that you install the CN0204 Evaluation Software to the default directory path C:/Program Files (x86)/Analog Devices/CN0204/ and all National Instruments products to C:/Program Files/National Instruments/


  2. Press Next to view the installation review page
  3. Press Next to start the installation
  4. Upon completion of the installation of the CN0204 Evaluation Software, the installer for the ADI SDP Drivers will execute.

    NOTE: It is recommended that you close all other applications before clicking “Next”. This will make it possible to update relevant system files without having to reboot your computer.


  5. Press Next to set the installation location for the SDP Drivers

    It is recommended that you install the drivers to the default directory path
    C:/Program Files/Analog Devices/SDP/Drivers


  6. Press Next to install the SDP Drivers. When prompted by Windows Security, just press Install
  7. Press Finish to complete the installation

Using the Evaluation Software

Main Window

  • Title Bar (Highlighted Violet)
  • System Configuration (Highlighted Orange)
    • Connector
      • Selects which 120-pin connection of the SDP-B Board to use
    • SCLK (Hz)
      • Sets the SPI clock frequency used by the evaluation board
  • AD5751 Configuration (Highlighted Blue)
    • JP1 Configuration
      • Sets the SPI address of the AD5750-1 based on the position of JP1
    • Range Select
      • Sets the voltage/current output range
    • Toggle CLEAR
      • Sets the outputs to the zero/midscale voltage value or the minimum value of the selected current range
  • AD5751 Error Indicator (Highlighted Yellow)
    • Vout Fault
      • There is a short circuit on the VOUT pin
    • Iout Fault
      • There is an open circuit on the IOUT pin
    • Over Temp
      • The AD5751 core temperature exceeds 150 °C
    • PEC Error
      • CRC-8 error checking detected an interface error
  • Output Setting Highlighted Red
    • Write AD5662
      • Writes the hexadecimal value in the left field to the AD5662 output voltage
    • Reset AD5751
      • Resets the AD5751 to its power-on state
  • Quit
    • Exits the software application

Running the System

  1. Open the CN0204.exe application from the default installation location.
  2. Set the correct connector and SCLK settings for the board in the System Configuration section.
  3. Click the Connect Button
  4. Upon successful connection, select the desired range of output on the Range Select drop-down menu.
  5. Input a hex value equivalent of the desired output level in the Output Setting section.
  6. Click Write AD5662
  7. Click Disconnect Button if finished.

Schematic, PCB Layout, Bill of Materials

EVAL-CN0204-SDPZ Design & Integration Files

  • Schematics
  • PCB Layout
  • Bill of Materials
  • PADS project

End of Document

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