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Dallas Semiconductor――温度传感器确定多个物理位置

2007年05月03日 15:42:00 中国传动网

5月2日新闻 Dallas Semiconductor 公司推出的DS28EA00数字温度传感器采用一个新型的链式协议信号快速自动确定应用中的单个传感器的物理位置,这些应用中的多个传感器连接到一个共同的线路中,该装置采用公司的1-Wire接口,这种接口通过一个简单的连接传输功率和通信,允许多个传感器独立安装在线路中操作,这种安装简化了要求精确多点数字温度测量的应用中的配线,降低了相关成本。 DS28EA00测量温度范围从−40°C到85°C。液体槽中的工厂温度确保了周围温度在−10°C到85°C间的最坏状况下转换误差为±0.5°C。周围温度在−40°C 到−10°C间最坏状况转换误差为±2.0°C,设备温度感应和数字化是由于匹配的晶体管不同的 VBE输出以及一阶sigma-delta模拟数字转换器。转换方案是用户采用9-bit到12-bit编程。 所有1-Wire设备都有一个唯一的64-bit内部串口序号,这些序号用于一个多支路环境选择特定的设备测试温度。但是DS28EA00是首个允许用户确定多个传感器物理位置的传感器,要求一个链式命令设置和两个信号针用于链式多支路设备。一个1-Wire主控制器采用链式命令协议获得链中每个部分的64-bit串口序号,从第一个现场设备开始同步进行。这项序列直接连接到每个传感器的物理位置。链式信号针还可以作为5-V 4-mA多用IO使用,控制LED指示器或其他I/O信号发送。DS28EA00使用8引脚封装。 original text: [COLOR=#708090]Temperature Sensor Signals Its Physical Location In A Crowd May 2, 2007 The DS28EA00 digital temperature sensor from Dallas Semiconductor uses a new chain-mode protocol signal to quickly and automatically ascertain the physical locations of individual sensors in applications where multiple sensors are connected to a common line. The device operates over the company‘s 1-Wire interface that delivers power and communication over a single connection, allowing multiple sensors to be placed on the line and operated independently. This arrangement minimizes wiring complexity and associated costs in applications that require accurate multipoint digital temperature measurements. The DS28EA00 measures temperature over the −40°C to 85°C range. Factory calibration in a liquid bath ensures a worst-case conversion error of ±0.5°C within an ambient-measurement range of −10°C to 85°C. Worst-case conversion error from −40°C to −10°C is ±2.0°C. Device temperature sensing and digitization is produced from the differential VBE output of a matched-npn transistor pair and a first-order sigma-delta analog-to-digital converter. Conversion resolution is user-programmable with 9-bit to 12-bit options. All 1-Wire devices have a unique 64-bit internal serial number that is used in a multi-drop environment to poll specific devices for temperature results. But the DS28EA00 is the first of its kind to allow users to determine the physical locations of the multiple sensors, employing a chain-mode command set and two signal pins for daisy-chaining multi-dropped devices. A 1-Wire host controller uses the chain-mode command protocol to learn the 64-bit serial number of each part in the chain, starting with the first device on the line and proceeding sequentially. This sequence knowledge is directly linked to the physical location of each device. The daisy-chain signal pins can also be used as 5-V, 4-mA general-purpose IO to control LED indicators or other I/O signaling. The DS28EA00 comes in an 8-pin microSOP package. [/COLOR]
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