MAX31888 ±0.25°C Accurate, 1-Wire® Temperature Sensor

Analog Devices' MAX31888 is a 1-Wire high precision, low-power digital temperature sensor with ±0.25ºC accuracy from -20ºC to +105ºC for precision temperature monitoring. The MAX31888 runs at 68 μA operating current during measurement and has 16-bit resolution (0.005ºC). The sensor communicates with a microcontroller over a 1-Wire bus that requires only one data line (and a ground reference) for communication. In addition, the sensor can derive power directly from the data line through “parasite power,” eliminating the need for an external power supply.

Each MAX31888 has its own unique 64-bit registration number factory programmed into the chip. This unique 64-bit registration number acts as the node address in the case of a multi-drop 1-Wire network. In multi-drop networks, optional GPIO pins can be used as address bits to identify each device's physical location. The MAX31888 is available in a 6-pin µDFN package. The power supply voltage range is from 1.7 V to 3.6 V for external power supplies. The operating temperature range is from -40°C to +125°C.

The MAX31888EVSYS# evaluation system (EV system) demonstrates the MAX31888 1-Wire temperature sensor with alarm function. The MAX31888 EV system includes the MAX31888 evaluation kit (EV kit) and the USB2PMB2 module. Windows® 7/8/8.1/10-compatible software provides a user-friendly interface that demonstrates the features of the MAX31888.

The MAX31888 EV kit contains an on-board DS2484 I²C to 1-Wire converter and comes with the 6-pin μDFN MAX31888ALT+T installed.

Block Diagram

Features

• Precise measurement and control of temperature at ±0.25°C accuracy
• 68 µA current consumption during temperature measurement
• < 0.6 µA standby current