电子发烧友App

硬声App

0
  • 聊天消息
  • 系统消息
  • 评论与回复
登录后你可以
  • 下载海量资料
  • 学习在线课程
  • 观看技术视频
  • 写文章/发帖/加入社区
会员中心
创作中心

完善资料让更多小伙伴认识你,还能领取20积分哦,立即完善>

3天内不再提示
创作
电子发烧友网>电子资料下载>类型>参考设计>CN0289灵活的4 mA至20 mA环路供电电压或电流驱动压力传感器变送器

CN0289灵活的4 mA至20 mA环路供电电压或电流驱动压力传感器变送器

2021-03-23 | pdf | 490.83KB | 次下载 | 2积分

资料介绍

This version (03 Jan 2021 22:00) was approved by Robin Getz.The Previously approved version (28 Jul 2017 08:45) is available.Diff

CN0289 Flexible, 4 mA-to-20 mA, Loop-Powered Pressure Sensor Transmitter with Voltage or Current Drive

OVERVIEW

The circuit is a robust and flexible 2 wire loop-powered current transmitter that converts the differential voltage output from a pressure sensor to a 4 mA-to-20 mA current output. The design is optimized for a wide variety of bridge based voltage or current driven pressure sensors, utilizes only four active devices, and has a total unadjusted error of less than 1%. The loop supply voltage can range from 12 V to 36 V. The input of the circuit is protected for ESD and voltages beyond the supply rail, making it ideal for loop powered industrial applications.


DEMO REQUIREMENTS

  • EVAL-CN0289-EB1Z circuit evaluation board
  • +7V to +24V power supply or equivalent power supply
  • Agilent 3458A or equivalent Current meter
  • Differential Pressure sensor or Equivalent Dual channel DC Signal Source

HARDWARE SETUP

Power Supply

  • From +7V to +24V supply can be used to J2 for proper operation of the evaluation board
In order for the circuit to operate properly, the supply voltage, must be greater than 7 V in order to provide sufficient headroom.

Input Signal

Using Actual Sensor

  1. A differential output bridge type sensor should be attached to a 4 channel screw terminal block (J1) labeled with SUPPLYSNS on the PCB.
  2. A differential sensor gauge like from Honeywell or from NXP can be used for evaluation.
  • Vsense is where the analog voltage output of the sensor is being taken for measurement. Pin polarity should be take into account.
  • V/Iforce is the sensor excitation or is being supplied either from current or voltage source.
Pin polarity for Vsense and for V/Iforce should be take into consideration since it varies from manufacturer.

Using Simulated Input Sensor

The following configuration can be used to simulate the sensor characteristic for evaluation pusposes.

  1. A dual power supply can be used to generate a common-mode voltage of 2.5 V from Vout1 and a 0 mV to 100 mV differential input voltage from Vout2 shown in the block diagram for test setup.
  2. A 3 kΩ at R_bridge simulates the bridge type sensor impedance.

For lower than 5 kΩ bridge resistance, the drive voltage can be decreased down to 5 V using a buffer configuration by removing resistor R6.

Sensor Drive

  • The circuit can be switched to the current or voltage drive configuration by moving S1 to the position labeled on the PCB.

Voltage Drive Configuration

  • In the voltage drive mode with VDRIVE = 10 V, the supply voltage VLOOP or system supply must be greater than 10.2 V

Current Drive Configuration

  • In the current drive mode, the supply voltage VLOOP or system supply must be greater than 11.2 V in order to maintain sufficient headroom.
Current drive configuration can be used for four-wire ohm circuit configuration where in the main advantage of this configuration is that the voltage is measured directly across the load cell, neglecting the load effect of the lead wires for long distance measurements.
Both for voltage and current drive mode, the minimum loop supply voltage is dependent on the configuration of the drive circuit for the bridge.

Output Measurements

The output of the system can be measured in two ways, either through direct output current measurement or voltage output through the series resistor.

Voltage Measurement

  • Voltage output measurement is done across a series 250ohms resistor that is be placed in series with the negative terminal of the power supply and the system ground loop

Current Measurement

  • Current output measurement is done by connecting the positive terminal of the current meter at the system ground loop (negative terminal of J2) and the negative terminal of the meter connected to the negative terminal of the power supply.
The system has an onboard resistor load (R7) of 250ohms that can be de-soldered to replace with a desired resistor load value

SCHEMATICS, PCB LAYOUT, BILL OF MATERIALS

End of Document

下载该资料的人也在下载 下载该资料的人还在阅读
更多 >

评论

查看更多

下载排行

本周

  1. 1HFSS电磁仿真设计应用详解PDF电子教程免费下载
  2. 24.30 MB   |  128次下载  |  1 积分
  3. 2雷达的基本分类方法
  4. 1.25 MB   |  4次下载  |  4 积分
  5. 3电感技术讲解
  6. 827.73 KB  |  2次下载  |  免费
  7. 4从 MSP430™ MCU 到 MSPM0 MCU 的迁移指南
  8. 1.17MB   |  2次下载  |  免费
  9. 5有源低通滤波器设计应用说明
  10. 1.12MB   |  2次下载  |  免费
  11. 6RA-Eco-RA2E1-48PIN-V1.0开发板资料
  12. 35.59 MB  |  2次下载  |  免费
  13. 7面向热插拔应用的 I2C 解决方案
  14. 685.57KB   |  1次下载  |  免费
  15. 8爱普生有源晶体振荡器SG3225EEN应用于储能NPC、新能源
  16. 317.46 KB  |  1次下载  |  免费

本月

  1. 12024年工控与通信行业上游发展趋势和热点解读
  2. 2.61 MB   |  763次下载  |  免费
  3. 2HFSS电磁仿真设计应用详解PDF电子教程免费下载
  4. 24.30 MB   |  128次下载  |  1 积分
  5. 3继电保护原理
  6. 2.80 MB   |  36次下载  |  免费
  7. 4正激、反激、推挽、全桥、半桥区别和特点
  8. 0.91 MB   |  32次下载  |  1 积分
  9. 5labview实现DBC在界面加载配置
  10. 0.57 MB   |  21次下载  |  5 积分
  11. 6在设计中使用MOSFET瞬态热阻抗曲线
  12. 1.57MB   |  15次下载  |  免费
  13. 7GBT 4706.1-2024家用和类似用途电器的安全第1部分:通用要求
  14. 7.43 MB   |  14次下载  |  免费
  15. 8AD18学习笔记
  16. 14.47 MB   |  8次下载  |  2 积分

总榜

  1. 1matlab软件下载入口
  2. 未知  |  935113次下载  |  10 积分
  3. 2开源硬件-PMP21529.1-4 开关降压/升压双向直流/直流转换器 PCB layout 设计
  4. 1.48MB  |  420061次下载  |  10 积分
  5. 3Altium DXP2002下载入口
  6. 未知  |  233084次下载  |  10 积分
  7. 4电路仿真软件multisim 10.0免费下载
  8. 340992  |  191360次下载  |  10 积分
  9. 5十天学会AVR单片机与C语言视频教程 下载
  10. 158M  |  183329次下载  |  10 积分
  11. 6labview8.5下载
  12. 未知  |  81578次下载  |  10 积分
  13. 7Keil工具MDK-Arm免费下载
  14. 0.02 MB  |  73804次下载  |  10 积分
  15. 8LabVIEW 8.6下载
  16. 未知  |  65985次下载  |  10 积分