PDF《方框图》

概述 MAX31820环境温度传感器提供9位至12位摄氏温度测量, 在+10°C至+45°C温度范围下的精度为±0.

5°C;

在-55°C至+125°C整个工作温度范围内,器件的精度为±2.0°C. 器件利用1-Wire?总线进行通信,顾名思义,只需要一根 数据线(及地)即可与中央控制器通信.此外,器件可直接 由数据线供电( 寄生供电 ),省去外部电源.器件引脚非 常少,能够采用3引脚TO-92封装.该封装尺寸允许器件 置于电路板上方,采用与表贴封装器件不同的方式测量系 统的环境温度. 每片MAX31820具有唯一的64位序列号,多个MAX31820 可以工作在同一1-Wire总线.因此,通过一个微控制器可 以方便地控制多个分布在较大区域的器件. 应用 HVAC环境控制 建筑、设备或机房内部温度监测系统 过程监测和控制系统 温度监控器 工业系统 消费类产品 温度计 任何温度敏感系统 优势和特性 独特的1-Wire接口仅占用一个端口引脚通信 每个器件具有唯一的64位序列号,储存在片上ROM 多点处理功能简化了分布式温度检测设计 无需外部元件 可通过数据线供电;

3.0V至3.7V电源范围 温度测量范围:-55°C至+125°C (-67°F至+257°F) +10°C至+45°C范围内精度保持在±0.5°C 用户可选择温度分辨率:9位至12位 在750ms?(最大值)内将温度转换成12位数字 用户可定义非易失(NV)报警设置 报警搜索命令识别并定位温度超出设定门限的器件(温 度报警条件) 采用3引脚TO-92封装 TO-92封装便于测量环境温度 软件兼容于DS1822和DS18B20 定购信息在数据资料的最后给出. 相关型号以及配合该器件使用的推荐产品,请参见:china.maximintegrated. com/MAX31820.related. 1-Wire是Maxim Integrated Products, Inc.的注册商标. MAX31820 64-BIT ROM AND 1-Wire PORT PARASITE- POWER CIRCUIT CPP VPU 4.7k? DQ GND VDD MEMORY CONTROL LOGIC SCRATCHPAD 8-BIT CRC GENERATOR CONFIGURATION REGISTER (EEPROM) TEMPERATURE REGISTER ALARM HIGH TRIGGER (TH) REGISTER (EEPROM) ALARM LOW TRIGGER (TL) REGISTER (EEPROM) POWER- SUPPLY SENSE 本文是英文数据资料的译文,文中可能存在翻译上的不准确或错误.如需进一步确认,请在您的设计中参考英文资料. 有关价格、供货及订购信息,请联络Maxim亚洲销售中心:10800

852 1249 (北中国区),10800

152 1249 (南中国区), 或访问Maxim的中文网站:china.maximintegrated.com. 19-6731;

Rev 0;

6/13 方框图 Voltage Range on Any Pin Relative to Ground.....-0.5V to +6.0V Operating Temperature Range.55°C to +125°C Storage Temperature Range.55°C to +125°C Soldering Temperature (reflow)260°C (VDD = 3.0V to 3.7V, TA = -55°C to +125°C, unless otherwise noted.) (Note 1) PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS Supply Voltage VDD Local power (Note 2) +3.0 +3.7 V Pullup Supply Voltage (Notes 2, 3) VPU Parasite power +3.0 +3.7 V Local power +3.0 VDD Thermometer Error (Note 4) TERR +10°C to +45°C ±0.5 °C -55°C to +125°C ±2 Input Logic-Low VIL (Notes 2, 5, 6) -0.3 +0.8 V Input Logic-High (Notes 2, 7) VIH Local power +2.2 lower of 3.7 or (VDD + 0.3) V Parasite power +3.0 lower of 3.7 or (VDD + 0.3) Sink Current IL VI/O = 0.4V (Note 2) 4.0 mA Standby Current IDDS (Notes 8, 9)

750 1000 nA Active Current IDD VDD = 5V (Note 10)

1 1.5 mA DQ Input Current IDQ (Note 11)

5 ?A Drift (Note 12) ±0.2 °C ??2 Absolute Maximum Ratings Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability. DC Electrical Characteristics (VDD = 3.0V to 3.7V, TA = -55°C to +125°C, unless otherwise noted.) (Note 1) Note 1: Limits are 100% tested at TA = +25°C and TA = +85°C. Limits over the operating temperature range and relevant supply voltage are guaranteed by design and characterization. Note 2: All voltages are referenced to ground. Note 3: The pullup supply voltage specification assumes that the pullup device is ideal, and therefore the high level of the pullup is equal to VPU. In order to meet the device'