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MAXREFDES60#:16位模拟输出微型PLC

MAXREFDES60

参考设计免责声明 参照  重要声明和免责声明  涵盖参考设计和其他Maxim资源

描述

工业4.01标志着第四次工业革命,其特点是分布式、智能化控制系统。工业4.0摆脱了过去体积笨重、集中式的可编程逻辑控制器,允许工厂高度可配置、高度模块化,为大量设备提供模拟信号控制,输出较之前更高。超小尺寸PLC,或称之为微型PLC,是工业4.0工厂的核心,以极小尺寸封装提供高性能,功耗极低。MAXREFDES60#是Maxim的微型PLC模拟输出卡。

MAXREFDES60#具有16位、高精度、0V–10V模拟输出,电源和数据隔离。MAXREFDES60#设计集成低噪声、快速稳定缓冲器(MAX9632);16位、低功耗DAC (MAX5216);超高精度4.096V电压基准(MAX6126);600VRMS数据隔离(MAX14850);STMicroelectronics® STM32F4微控制器;FTDI USB-UART桥;高效DC-DC转换器(MAX17552);隔离/稳压+15V、+5.5V和-3V电源(MAX17498C/MAX8719/MAX1659/MAX1735)。整个系统的功耗通常小于250mW,适合用于信用卡大小的空间。用于工业微型PLC领域时,MAXREFDES60#可用于任何要求高精度模拟输出的应用。


图1. MAXREFDES60#参考设计方框图。

特征

  • 高精度
  • 0至10V电压输出,±20%过压保护
  • 隔离电源和数据
  • 微型PLC规格
  • 器件驱动器
  • C语言源代码示例
  • 测试数据

  • maxrefdes60fig00

    maxrefdes60fig00

  • MAXREFDES60

    This single channel analog output reference design is in the micro PLC form factor. The on-board microcontroller controls a 16-bit DAC to produce a high accuracy 0-10V output. The design features isolated power and data. MAXREFDES60

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设计, 制作, 测试

图中的电路板已经完成封装和测试。

 

细节部分

细节部分

Detailed Description of Hardware

The power requirement is shown in Table 1.

Table 1. Power Requirement for the MAXREFDES60# Reference Design

Power Type Input Voltage (V) Input Current (mA, typ)
On-board isolated power 24 10

Note: STM32 and FTDI are powered by USB separately.

The analog output circuit consists of a 16-bit, rail-to-rail DAC MAX5216 (U401) and a low-noise fast-settling operational amplifier MAX9632 (U403). The DAC’s reference input is driven by an ultra-high precision 5V voltage reference, the MAX6126 (U402), with 0.02% initial accuracy and a 3ppm/°C maximum temperature coefficient (tempco). The output of the DAC is 0V to 5V, and the op amp amplifies the signal to 0V to 10V plus 20% margin.

The MAXREFDES60# uses the ultra-efficient MAX17498C (U501) to generate the isolated +17.5V, +7.5V, and -5V rails from a 24V supply. The MAX8719 (U102), MAX1659 (U103), and MAX1735 (U104) provide post-regulated +15V, +5.5V, and -3V rails. The MAX14850 (U301) digital data isolators provide data isolation. The combined power and data isolation achieved is 600VRMS.

The MAX17552 (U101) step-down DC-DC converter converts the +5V supply from the USB to +3.3V and powers the STM32 (U1) microcontroller and FTDI (U201) USB-UART bridge.

The equation to convert the DAC code to output voltage is:

VOUT = 12 × CODEDAC/65536

Detailed Description of Firmware

The MAXREFDES60# uses the on-board STM32F4 microcontroller to communicate with the DAC.The user sets the DAC output code through a terminal program.The user can also use the MAXREFDES60# to generate a customized sine wave. The simple process flow is shown in Figure 2. The firmware is written in C using the Keil® µVision® 5 tool.


Figure 2. The MAXREFDES60# firmware flowchart.

The firmware accepts commands, writes statuses, and is capable of generating a user-customized sine wave. The complete source code is provided to speed up customer development. Code documentation can be found in the corresponding firmware platform files.

Quick Start

Required equipment:

  • Windows® PC with a USB port
  • MAXREFDES60# board
  • 24V power supply
  • Voltmeter

Procedure

The reference design is fully assembled and tested. Follow the steps below to verify board operation:

  1. Turn or keep off the 24V power supply.
  2. The MAXREFDES60# utilizes the FTDI USB-UART bridge IC. If Windows cannot automatically install the driver for the FTDI USB-UART bridge IC, the driver is available for download from www.ftdichip.com/Drivers/VCP.htm.
  3. Connect the negative terminal of the 24V power supply to the PGND connector on the MAXREFDES60# board. Connect the positive terminal of the 24V power supply to the +24V connector on the MAXREFDES60# board.
  4. Turn on the 24V power supply.
  5. Connect the USB cable from the PC to the MAXREFDES60# board.
  6. Open the hyperterminal or similar terminal program on the PC. Find the appropriate COM port, usually a higher number port, such as COM4 or COM6, and configure the connection for 921600, n, 8, 1, none (flow control).
  7. The MAXREFDES60# software displays a menu (Figure 3).
  8. For immediate signal testing, connect the negative terminal of the voltmeter to the GND terminal of the P401 terminal block. Connect the positive terminal of the voltmeter to the OUT terminal of the P401 terminal block. The outputs are labeled on the bottom side of the board.
  9. Press 1 in the terminal program to select Set DAC output.
  10. Type in 7FFF and press the Enter key.
  11. Verify the output voltage is approximately 6V.

Terminal program main menu.
Figure 3. Terminal program main menu.

Lab Measurements

Equipment used:

  • Maxim custom FPGA test board
  • Agilent® 3458A digital multimeter
  • Agilent E3631A DC power supply
  • National Instruments® GPIB card and cable
  • Perl script for controlling the FPGA development kit and measurement equipment
  • Windows PC
  • MAXREFDES60# board

Measurements of DNL, INL, and TUE for the 0V to 10V voltage output with a 20% overrange are shown in Figure 4, Figure 5, and Figure 6, respectively.


Figure 4. DNL for 0V to 10V output with 20% overrange.


Figure 5. INL for 0V to 10V output with 20% overrange.


Figure 6. Output error for 0V to 10V output with 20% overrange.

Reference

  1. The new generation of manufacturing production is called Industry 4.0 in Germany and Smart Manufacturing System elsewhere. See, Securing the future of German manufacturing industry, Recommendations for implementing the strategic initiative INDUSTRIE 4.0, Final report of the Industrie 4.0 Working Group, Industry 4.0 Working Group, Acatech National Academy of Science and Engineering, April 2013, https://www.acatech.de/wp-content/uploads/2018/03/Final_report__Industrie_4.0_accessible.pdf. Henceforth cited as Industrie 4.0. Although the Industrie 4.0 report is focused on Germany, the implications of the German research and findings are recognized for industry in other countries. See also Ferber, Stefan, “Industry 4.0 – Germany takes the first steps toward the next industrial revolution,” Bosch Software Group, Blogging the Internet of Things, October 16, 2013, http://blog.bosch-si.com/industry-4-0-germany-takes-first-steps-toward-the-next-industrial-revolution/.

    There are many sources for Smart Manufacturing Leadership. An interesting summary report of issues and topics can be found at the Smart Manufacturing Leadership Coalition Committee Working Meeting, Minneapolis, MN, U.S., Thursday, October 20, 2011, https://smart-process-manufacturing.ucla.edu/workshops/2011-workshop/presentations/SMLC%2010-20-11v3.pdf. Also see, Implementing 21st Century Smart Manufacturing, Workshop Summary Report, Smart Manufacturing Leadership Coalition, June 24, 2011, https://smart-process-manufacturing.ucla.edu/about/news/Smart%20Manufacturing%206_24_11.pdf. A simple web search on the topic will reveal considerably more references.

µVision is a registered trademark of ARM, Inc.
Agilent is a registered trademark and registered service mark of Agilent Technologies, Inc.
Keil is a registered trademark and registered service mark of ARM Limited.
National Instruments is a registered trademark of National Instruments Corporation.
STMicroelectronics is a registered trademark of STMicroelectronics, Inc.
Windows is a registered trademark and registered service mark of Microsoft Corporation.

参数化

输入类型 Vin(Min) Vin(Max) Iout(Max) 单路/多路输出 Vout(V) Pout(W) 隔离/非隔离 拓扑
DC 24 - - - - - Isolated Flyback

参数化

输入类型 DC
Vin(Min) 24
Vin(Max) -
Iout(Max) -
单路/多路输出 -
Vout(V) -
Pout(W) -
隔离/非隔离 Isolated
拓扑 Flyback

Maxim设备 (8)

器件号 名称 产品线 购买 设计套件和评估模块
MAX5216 14/16位低功耗、带SPI接口的,缓冲输出的满摆幅DAC 数/模转换器(DAC) 立即购买 Design Kits
MAX9632 36V、高精度、低噪声宽带放大器 放大器 立即购买 Design Kits
MAX14850 六通道数字隔离器 隔离IC 立即购买 Design Kits
MAX17552 60V、100mA、超小尺寸、高效率、 同步降压型DC-DC转换器,空载耗流为22μA 开关稳压器 立即购买 Design Kits
MAX8719 高压、低功耗线性稳压器,用于笔记本电脑 线性稳压器 立即购买 Design Kits
MAX1659 350mA、16.5V输入、低压差线性稳压器 线性稳压器 立即购买 Design Kits
MAX1735 200mA、负输出、低压差线性稳压器,SOT23封装 线性稳压器 立即购买 Design Kits
MAX17498C AC-DC和DC-DC峰值电流模式转换器,支持反激/Boost应用 隔离电源 立即购买 Design Kits

Maxim设备 (8)

器件号 产品线
数/模转换器(DAC)
14/16位低功耗、带SPI接口的,缓冲输出的满摆幅DAC
放大器
36V、高精度、低噪声宽带放大器
隔离IC
六通道数字隔离器
开关稳压器
60V、100mA、超小尺寸、高效率、 同步降压型DC-DC转换器,空载耗流为22μA
线性稳压器
高压、低功耗线性稳压器,用于笔记本电脑
线性稳压器
350mA、16.5V输入、低压差线性稳压器
线性稳压器
200mA、负输出、低压差线性稳压器,SOT23封装
隔离电源
AC-DC和DC-DC峰值电流模式转换器,支持反激/Boost应用

设计资料 (6)

标题 类型 尺寸 日期
No Title PDF 240KB 2019-07-09
No Title PDF 1MB 2019-07-09
rd60_stm32f4_v01_00 ZIP 8MB 2019-07-09
MAXREFDES60BMA.xls PDF 15KB 2019-07-09
rd60v01_00 ZIP 10MB 2019-07-09
maxrefdes60_cad_ra ZIP 334KB 2019-07-09
日期 类型
2019-07-09

No Title

(PDF, 240KB)

2019-07-09

No Title

(PDF, 1MB)

2019-07-09

rd60_stm32f4_v01_00

(ZIP, 8MB)

2019-07-09

MAXREFDES60BMA.xls

(PDF, 15KB)

2019-07-09

rd60v01_00

(ZIP, 10MB)

2019-07-09

maxrefdes60_cad_ra

(ZIP, 334KB)

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