LM75A就很好，11bit精度，iic的協議，不到一塊錢的價格，采樣時間比18b20低很多————————————LM75A:高速I2C總線接口，有A2-A0地址線，一條總線上最多可同時使用8個LM75A；低功耗設計，工作電流典型值為250uA，掉電模式為3.5uA；測量的溫度最大范圍為-55℃～+125℃；寬工作電壓范圍：2.8V～5.5V；提供了良好的溫度精度（0.125℃）；可編程溫度閾值和滯后設定點。————————————————再來一個13bit的DS1624也是IIC協議的，13bit，測量精度0.03125°C，大概三四塊的價格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)