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MAXREFDES1154: Configurable 4-Channel RTD/TC Measurement System Using the MAX11410

MAXREFDES1154

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

The MAXREFDES1154 is a configurable 4-channel RTD/ TC measurement system. Each channel can be configured as either RTD input or TC input using RTD for cold junction compensation. The RTD can either be PT100 or PT1000 connected in 2-wire or 3-wire configuration. The same configuration can also be used to measure resistance. MAXREFDES1154 also supports all types of thermocouples, using RTD for cold junction compensation, which can be PT100 or PT1000, but it needs to be configured as a 2-wire connection.

The MAXREFDES1154 provides a complete system solution for highly accurate temperature measurement in industrial applications. Analog front end includes two 8:1 multiplexer MAX4617 and one 4:1 multiplexer MAX4704 for RTD/TC input selection, and one 24-bit, 10-channel ADC MAX11410.

The microcontroller on board is used to communicate with the MAX11410 ADC, control the multiplexers, and process the ADC conversion results. The 24V field input power supply is isolated from both the analog front end and the microcontroller, which is powered using a USB. Isolation enhances system robustness, an important consideration in harsh industrial applications.

The MAXREFDES1154 design integrates two 8:1 multiplexer (MAX4617) and one 4:1 multiplexer (MAX4704), a 24-bit 10-channel ADC with internal PGA buffers (MAX11410), a high-precision 1.250V voltage reference (MAX6071), 2.75kVRMS digital isolator (MAX14930 and MAX14931), a STM32F1 microcontroller, a μP supervisor (MAX6730), a FTDI USB-UART bridge, a high-efficiency Iso-Buck DC-DC converter (MAX17681), and an isolated/regulated +3.3V power rail (MAX16910). The entire system typically consumes less than 300mW and fits onto a 5cm x 9cm board. It is targeted for industrial PLC applications.

特征

  • Highly accurate measurement
  • Four channels
  • Each channel can be configured as either RTD or TC input
  • Supports 2-wire and 3-wire RTD
  • Supports all types of thermocouple
  • Thermocouple with RTD for cold junction compensation
  • Sensor open detection
  • 24V input protection
  • Isolated power and data
  • Board-level calibration

Icon

设计, 制作, 测试

图中的电路板已经完成封装和测试。不可售。

 

示意图

物料清单(BOM)

试验结果

Maxim设备 (8)

器件号 名称 产品线 购买 设计套件和评估模块
MAX11410 24-Bit Multi-Channel Low-Power 1.9ksps Delta-Sigma ADC with PGA 模/数转换器(ADC) 立即购买 Design Kits
MAX4617 高速、低电压、CMOS模拟多路复用器/开关 模拟开关和多路复用器 立即购买 Not Available
MAX4704 低电压、60Ω、4:1模拟多路复用器,QFN封装 模拟开关和多路复用器 立即购买 Not Available
MAX14930 四通道、 1kVRMS、2.75kVRMS及3.75kVRMS数字隔离器 隔离IC 立即购买 Design Kits
MAX14931 四通道、 1kVRMS、2.75kVRMS及3.75kVRMS数字隔离器 隔离IC 立即购买 Design Kits
MAX6730 单/双/三电压微处理器监控电路,带有独立的看门狗输出 电路监控、电压监测器及排序器 立即购买 Not Available
MAX17681 4.5V至42V输入、高效、Iso-Buck DC-DC转换器 隔离电源 立即购买 Design Kits
MAX16910 200mA, Automotive, Ultra-Low Quiescent Current, Linear Regulator 线性稳压器 立即购买 Design Kits

Maxim设备 (8)

器件号 产品线
模/数转换器(ADC)
24-Bit Multi-Channel Low-Power 1.9ksps Delta-Sigma ADC with PGA
模拟开关和多路复用器
高速、低电压、CMOS模拟多路复用器/开关
Not Available
模拟开关和多路复用器
低电压、60Ω、4:1模拟多路复用器,QFN封装
Not Available
隔离IC
四通道、 1kVRMS、2.75kVRMS及3.75kVRMS数字隔离器
隔离IC
四通道、 1kVRMS、2.75kVRMS及3.75kVRMS数字隔离器
电路监控、电压监测器及排序器
单/双/三电压微处理器监控电路,带有独立的看门狗输出
Not Available
隔离电源
4.5V至42V输入、高效、Iso-Buck DC-DC转换器
线性稳压器
200mA, Automotive, Ultra-Low Quiescent Current, Linear Regulator

设计资料 (6)

标题 类型 尺寸 日期
maxrefdes1154_bom PDF 113KB 2019-07-09
maxrefdes1154_test_results PDF 355KB 2019-07-09
MAXREFDES1154 - Configurable 4-Channel RTD/TC Measurement System Using the MAX11410 PDF 799KB 2019-07-09
maxrefdes1154_pcb PDF 2MB 2019-07-09
maxrefdes1154_sch PDF 55KB 2019-07-09
maxrefdes1154-firmware ZIP 7MB 2019-08-13
日期 类型
2019-07-09

maxrefdes1154_bom

(PDF, 113KB)

2019-07-09

maxrefdes1154_test_results

(PDF, 355KB)

2019-07-09

MAXREFDES1154 - Configurable 4-Channel RTD/TC Measurement System Using the MAX11410

(PDF, 799KB)

2019-07-09

maxrefdes1154_pcb

(PDF, 2MB)

2019-07-09

maxrefdes1154_sch

(PDF, 55KB)

2019-08-13

maxrefdes1154-firmware

(ZIP, 7MB)

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