MAX31820PAR

1-Wire Parasite-Power, Ambient Temperature Sensor

Parasite-Powered Digital Temperature Sensor in TO-92 Package Minimizes Wiring and is Ideal for Measuring Ambient Temperature


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说明

The MAX31820PAR ambient temperature sensor provides 9-bit to 12-bit Celsius temperature measurements with ±0.5°C accuracy over a +10°C to +45°C temperature range. Over its entire -55°C to +125°C operating range, the device has ±2.0°C accuracy.

The device communicates over a 1-Wire® bus that, by definition, requires only one data line (and ground) for communication with a central microprocessor. In addition, the device derives power directly from the data line (“parasite power”), eliminating the need for an external power supply. Requiring so few pins enables the device to be placed in a 3-pin TO-92 package. The form factor of this package allows the device to be placed above the board and thus measure the ambient temperature of a system, as opposed to the board temperature that a surface-mount package would measure.

Each MAX31820PAR has a unique 64-bit serial code, which allows multiple MAX31820PAR devices to function on the same 1-Wire bus. Therefore, it is simple to use one microprocessor to control many devices distributed over a large area.
MAX31820PAR: Block Diagram MAX31820PAR: Block Diagram 放大+

关键特性

  • Unique 1-Wire Interface Requires Only One Port Pin for Communication
  • Derives Power from Data Line (Parasite Power); No Local Power Supply Needed
  • Multidrop Capability Simplifies Distributed Temperature-Sensing Applications
  • Requires No External Components
  • Measures Temperatures from -55°C to +125°C (-67°F to +257°F)
  • ±0.5°C Accuracy from +10°C to +45°C
  • Thermometer Resolution is User-Selectable from 9 Bits to 12 Bits
  • Converts Temperature to 12-Bit Digital Word in 750ms (Max)
  • User-Definable Nonvolatile (NV) Alarm Settings
  • Alarm Search Command Identifies and Addresses Devices Whose Temperature is Outside Programmed Limits (Temperature Alarm Condition)
  • Available in 3-Pin TO-92 Package
  • Software Compatible with the DS1822-PAR and DS18B20-PAR

应用

  • 任何对温度敏感的系统
  • 消费类产品
  • HVAC环境控制
  • 工业系统
  • 过程监测和控制系统
  • 建筑、设备或机房内部温度监测系统
  • 温度计
  • 温度监控器控制

Pricing Notes:
This pricing is BUDGETARY, for comparing similar parts. Prices are in U.S. dollars and subject to change. Quantity pricing may vary substantially and international prices may differ due to local duties, taxes, fees, and exchange rates. For volume-specific and version-specific prices and delivery, please see the price and availability page or contact an authorized distributor.

技术资料

参考原理图 5508 Create a 1-Wire Master with Xilinx PicoBlaze
应用笔记 5507 Understanding the DS1WM Synthesizable 1-Wire Bus Master
设计指南 4700 Introduction to Medical Instruments and Growing Trend for Point-of-Care and Near-Patient Testing
设计指南 4699 传感器信号通道
设计指南 4679 热管理设计手册
应用笔记 4600 简单软件实现1-Wire®温度器件的硬件CRC校验和串行码流的误码检测
参考原理图 4477 1-Wire®双向电平转换器(1.8V至5V)参考设计
应用笔记 4377 Comparison of the DS18B20 and DS18S20 1-Wire® Digital Thermometers
应用笔记 4277 采用MAXQ2000 USB “拇指”评估套件进行设计
应用笔记 3930 Package Thermal Resistance Values (Theta JA, Theta JC) for Temperature Sensors and 1-Wire Devices
应用笔记 3754 Single-Wire Serial Bus Carries Isolated Power and Data
应用笔记 2965 1-Wire Master Device Configuration
应用笔记 2420 与Microchip PICmicro微控制器之间的1-Wire®通信
应用笔记 1100 White Paper 5: Using 1-Wire APIs for Data Sheet Commands
参考原理图 244 性能优异的1-Wire网络驱动器
应用笔记 208 Curve Fitting the Error of a Bandgap-Based Digital Temperature Sensor
应用笔记 203 DS18B20-PAR/DS18S20-PAR/DS1822-PAR Advantages for Remote Temperature Sensing
应用笔记 192 DS2480B串行接口1-Wire®线驱动器的使用
应用笔记 187 1-Wire搜索算法
应用笔记 162 Interfacing the DS18X20/DS1822 1-Wire® Temperature Sensor in a Microcontroller Environment
应用笔记 158 用XML实现1-Wire®标签
设计指南 148 长线1-Wire网络可靠设计指南
应用笔记 126 用软件实现1-Wire®通信
应用笔记 27 理解和运用Maxim iButton产品中的循环冗余校验(CRC)
申请可靠性报告: MAX31820PAR 
型号   生产流程   工艺   样本量   不合格   FIT @ 25°C   FIT @ 55°C   Material Composition  

备注: 通过技术手段对故障率进行汇总,并映射到相关的材料部件号。 故障率与被测件的数量密切相关。

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类型 编号 标题
参考原理图 5508 Create a 1-Wire Master with Xilinx PicoBlaze
应用笔记 5507 Understanding the DS1WM Synthesizable 1-Wire Bus Master
设计指南 4700 Introduction to Medical Instruments and Growing Trend for Point-of-Care and Near-Patient Testing
设计指南 4699 传感器信号通道
设计指南 4679 热管理设计手册
应用笔记 4600 简单软件实现1-Wire®温度器件的硬件CRC校验和串行码流的误码检测
参考原理图 4477 1-Wire®双向电平转换器(1.8V至5V)参考设计
应用笔记 4377 Comparison of the DS18B20 and DS18S20 1-Wire® Digital Thermometers
应用笔记 4277 采用MAXQ2000 USB “拇指”评估套件进行设计
应用笔记 3930 Package Thermal Resistance Values (Theta JA, Theta JC) for Temperature Sensors and 1-Wire Devices
应用笔记 3754 Single-Wire Serial Bus Carries Isolated Power and Data
应用笔记 2965 1-Wire Master Device Configuration
应用笔记 2420 与Microchip PICmicro微控制器之间的1-Wire®通信
应用笔记 1100 White Paper 5: Using 1-Wire APIs for Data Sheet Commands
参考原理图 244 性能优异的1-Wire网络驱动器
应用笔记 208 Curve Fitting the Error of a Bandgap-Based Digital Temperature Sensor
应用笔记 203 DS18B20-PAR/DS18S20-PAR/DS1822-PAR Advantages for Remote Temperature Sensing
应用笔记 192 DS2480B串行接口1-Wire®线驱动器的使用
应用笔记 187 1-Wire搜索算法
应用笔记 162 Interfacing the DS18X20/DS1822 1-Wire® Temperature Sensor in a Microcontroller Environment
应用笔记 158 用XML实现1-Wire®标签
设计指南 148 长线1-Wire网络可靠设计指南
应用笔记 126 用软件实现1-Wire®通信
应用笔记 27 理解和运用Maxim iButton产品中的循环冗余校验(CRC)