Maxim Releases a New Temperature Sensor with 0.25 °C Accuracy

Maxim MAX31889

High-Precision I2C Temperature Sensor on a Battery Power Budget

Maxim Integrated has announced the new temperature sensor IC MAX31889. The MAX31889 operates from a 1.7 V to 3.6 V supply voltage, and is a low-power, high-accuracy digital temperature sensor with ±0.25 °C accuracy from –20 °C to +105 °C and ±0.65 °C accuracy from –40 °C to +125 °C. The MAX31889 has 16-bit resolution (0.005 °C).

Maxim - MAX31889

The device uses a standard I2C serial interface to communicate with a host controller. Two GPIO pins are available. GPIO1 can be configured to trigger a temperature converison, while GPIO0 can be configured to generate an interrupt for selectable status bits.

Accuracy vs. Temperature
Accuracy vs. Temperature (VDD = 3.3V 59 Units).

The MAX31889 includes a 32-word FIFO for the temperature data and also includes high and low threshold digital temperature alarms. The device is available in a 2 mm × 2 mm × 0.8 mm, 6-pin, µDFN package.

Key Features

  • High Accuracy
    • ±0.25 °C Accuracy from –20 °C to +105 °C
    • ±0.65 °C Accuracy from –40 °C to +125 °C
  • Long Battery Life
    • 1.7 V to 3.6 V Operating Voltage
    • 68 µA Operating Current During Measurement
    • 0.55 µA Shutdown Current
  • 2 mm × 2 mm × 0.8 mm, 6-Pin µDFN
  • High and Low Temperature Alarms
  • I2C Digital Interface
    • Configurable Convert Temperature Input Pin
    • Configurable Interrupt Output Pin
    • 32-Word FIFO for Temperature Data
    • 4 I2C Addresses Available – More Addresses Available by Request
    • Unique ROM IDs Allow Device to Be NIST Traceable


  • Internet of Things (IoT) Sensors
  • Precision Temperature Monitoring
  • RTD Replacement
The MAX31889 Evaluation System
The MAX31889 Evaluation System.

JLCPCP: 2USD 2Layer 5PCBs, 5USD 4Layer 5PCBs

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