資料來源:https://www.sparkfun.com/products/14049
The MAX31820 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 one-wire bus that, by definition, requires only one data line (and ground) for communication with a central microprocessor. In addition, the device can derive power directly from the data line, 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 MAX31820 has a unique 64-bit serial code, which allows multiple MAX31820 devices to function on the same one-wire bus. Therefore, it is simple to use one microprocessor to control many devices distributed over a large area.
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該MAX31820環境溫度傳感器提供了9位至12位攝氏溫度測量與±0.5°C精確度超過+ 10°C至+ 45°C溫度範圍。在整個-55°C至+ 125°C的工作範圍內,該器件具有±2.0°C的精度。
該裝置在1線總線,根據定義,需要與中央微處理器通信只有一個數據線(和接地)連通。另外,該裝置可以從數據線直接導出功率,消除了對外部電源的需要。需要這麼幾個引腳使器件能夠被放置在一個3引腳TO-92封裝。這個包的外形可使器件置於板上方,因此衡量一個系統的環境溫度,相對於電路板溫度,一個表面貼裝封裝將衡量。
每個MAX31820具有獨特的64位序列碼,它允許多個MAX31820器件的同一個線總線上運行。因此,它是簡單的使用一個微處理器來控制分佈在大面積上的許多設備。
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