LM75A就很好，11bit精度，iic的协议，不到一块钱的价格，采样时间比18b20低很多————————————LM75A:高速I2C总线接口，有A2-A0地址线，一条总线上最多可同时使用8个LM75A；低功耗设计，工作电流典型值为250uA，掉电模式为3.5uA；测量的温度最大范围为-55℃～+125℃；宽工作电压范围：2.8V～5.5V；提供了良好的温度精度（0.125℃）；可编程温度阈值和滞后设定点。————————————————再来一个13bit的DS1624也是IIC协议的，13bit，测量精度0.03125°C，大概三四块的价格FEATURES Temperature measurements require no external components Measures temperatures from -55°C to +125°C in 0.03125°C increments. Fahrenheit equivalent is -67°F to +257°F in 0.05625°F increments Temperature is read as a 13-bit value (two byte transfer) Converts temperature to digital word in 1 second (max) 256 bytes of E2 memory on board for storing information such as frequency compensation coefficients Data is read from/written via a 2-wire serial interface (open drain I/O lines)
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