Maxim DS18B20可编分辨率1线数字温度计解决方案
Maxim公司的DS18B20是可编分辨率1Wire(线)数字温度计,提供9位到12位摄氏温度测量,在非易失可编用户上限和下限时具有告警功能.DS18B20在1Wire(线)总线(由数据线和地)和中央处理器进行通信.此外,器件直接从数据线(寄生电源)驱动电源,而不需要外接电源.每个DS18B20有单独的64位串行代码(存储在板上ROM),使得多个DS18B20可作用在同一的1Wire(线)总线上.这样用一个微处理器就能控制分布在大面积的许多个DS18B20.测量温度范围从 -55℃到 +125℃ (-67°F到 +257°F), -10℃ 到 +85℃时的测量精度为±0.5℃,可编分辨率从9比特到12比特摄氏度.DS18B20不需要任何的外接元件.主要用在热电控制,工业系统,消费类电子产品,热敏感系统和温度计.本文介绍了DS18B20主要特性和优势,框图和评估板DS18B20 EVS主要特性,电路图,材料清单和PCB设计图.
The DS18B20 digital thermometer provides 9-bit to 12-bit Celsius temperature measurements and has an alarm function with nonvolatile user-programmable upper and lower trigger points. The DS18B20 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 DS18B20 can derive power directly from the data line (“parasite power”),eliminating the need for an external power supply.
Each DS18B20 has a unique 64-bit serial code, which allows multiple DS18B20s to function on the same 1-Wire bus. Thus, it is simple to use one microprocessor to control many DS18B20s distributed over a large area.
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