One-Wire Ambient Temperature Sensor - MAX31820

The Sparkfun MAX31820 Ambient Temperature Sensor is a highly accurate and versatile device that provides Celsius temperature measurements, ranging from -55°C to +125°C. It is capable of giving 9-bit to 12-bit temperature readings with an impressive ±0.5°C accuracy within the +10°C to +45°C range. The sensor communicates via a one-wire bus, which only requires a single data line and ground for communication with a central microprocessor. This one-wire feature not only simplifies the setup but also allows the sensor to draw power directly from the data line, eliminating the need for an external power supply. The sensor comes in a compact 3-pin TO-92 package, making it easy to measure the ambient temperature of a system.

One of the unique properties of the MAX31820 temperature sensor is its multidrop capability. Each sensor has a unique 64-bit serial code stored in its onboard ROM. This feature allows multiple MAX31820 devices to function on the same one-wire bus, making it possible for a single microprocessor to control many devices distributed over a large area. This capability greatly simplifies distributed temperature-sensing applications.

Another major advantage of the MAX31820 sensor is its user-friendly design. It requires no external components and can be powered directly from the data line. The sensor also allows users to select the thermometer resolution from 9 bits to 12 bits, and it can convert temperature to a 12-bit digital word in a maximum of 750ms. Furthermore, it has user-definable nonvolatile alarm settings, and its alarm search command can identify and address devices whose temperature is outside the programmed limits.

The Sparkfun MAX31820 Ambient Temperature Sensor is not only efficient and accurate but also compatible with the DS1822 and DS18B20 software. Its convenient 3-pin TO-92 package allows it to measure ambient temperature, making it a versatile tool for a wide range of temperature monitoring applications.