Digital infrared thermometer IC with narrow wavelength filter

The MLX90617 is a high-precision infrared thermometer designed for non-contact temperature measurements. It features a specific wavelength filter that enables it to detect infrared radiation from hot objects behind ceramic glass, making it suitable for applications like induction cooktops.

This sensor comes factory calibrated for a wide temperature range, measuring ambient temperatures from -0°C to +125°C and object temperatures from 70°C to 250°C. The MLX90617 achieves high accuracy and resolution thanks to its low-noise amplifier, 17-bit ADC, and powerful DSP.

The sensor outputs data via PWM or SMBus interfaces, with the default power-on-reset setting configured for SMBus. It measures the average temperature of all objects in its field of view and includes an optical band pass filter for detecting radiation transmitted through ceramic glass.

The MLX90617 is calibrated for an emissivity of 1.0 but can be adjusted for emissivity values between 0.1 and 1.0 without requiring recalibration with a blackbody. However, the accuracy may be influenced by thermal conditions such as nearby heat sources or objects that alter the sensor package temperature. This makes understanding the application environment critical for optimal performance.

An application note, a reference design and an evaluation kit are available on request.

Application examples:

• Cooking pots temperature monitoring through ceramic glass
  • Safety temperature monitoring
  • Automated recipe cooking