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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

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.

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

MAX31820PAR: Block Diagram 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

数据手册DataSheet

关键参数

技术资料

• Create a 1-Wire Master with Xilinx PicoBlaze
• Understanding the DS1WM Synthesizable 1-Wire Bus Master
• Introduction to Medical Instruments and Growing Trend for Point-of-Care and Near-Patient Testing
• Comparison of the DS18B20 and DS18S20 1-Wire® Digital Thermometers
• Package Thermal Resistance Values (Theta JA, Theta JC) for Temperature Sensors and 1-Wire Devices
• Single-Wire Serial Bus Carries Isolated Power and Data
• 1-Wire Master Device Configuration
• White Paper 5: Using 1-Wire APIs for Data Sheet Commands
• Curve Fitting the Error of a Bandgap-Based Digital Temperature Sensor
• DS18B20-PAR/DS18S20-PAR/DS1822-PAR Advantages for Remote Temperature Sensing
• Interfacing the DS18X20/DS1822 1-Wire® Temperature Sensor in a Microcontroller Environment

相关产品

• DS1822-PAR：经济型、寄生供电数字温度计
• DS18B20-PAR：1-Wire寄生供电数字温度计

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