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WSAL17220 – MLX90640-D55 Thermal Camera/en

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Documentation notice: This technical documentation was independently rewritten from an archived supplier source. Check technical details and commands against the product version and manufacturer documentation before use.

Summary

The MLX90640-D55 is a 32×24-pixel infrared array thermal imaging camera with a 55° horizontal field of view and an I2C interface. It is accessed over I2C (default address 0x33) and supports 3.3 V or 5 V operating voltages.

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Technical overview

  • Resolution: 32 × 24 pixels, 768 IR sensors in total (thermopile).
  • Field of view: 55° horizontal, 35° vertical; designed for distance measurement.
  • I2C bus: default device address 0x33; the bus supports fast mode up to 1 MHz.
  • Operating voltage: 3.3 V or 5 V; onboard level shifter allows direct connection to a 5 V I2C bus.
  • Operating current: less than 23 mA.
  • Operating temperature range: −40 °C to +85 °C.
  • Target temperature range: −40 °C to +300 °C; resolution ±1 °C.
  • Refresh rate: programmable between 0.5 Hz and 64 Hz; controlled via control register 1 (0x800D), bits 7–9 select the rate, bit 12 selects chessboard or TV interleave mode.
  • Dimensions: 28 mm × 16 mm; mounting hole 2.0 mm diameter.
  • Applications: non-contact temperature measurement, industrial temperature control, motion detection.

Notes and version constraints

  • The manufacturer allows up to four defective pixels out of the factory; these are marked in the EEPROM. Defective pixels are not grounds for return or exchange; using the average value of adjacent pixels is recommended as a substitute.
  • The source does not provide exact measurement-distance values; the stated test figures (e.g., contour recognition up to about 5 m for D55) come from internal Waveshare tests under defined conditions (room temperature 22 °C, dim light, 178 cm tall person).
  • The IR wavelength range is given as 5.5–14 µm; specific calibration parameters and emissivity settings must be adjusted according to target material.
  • Examples for Raspberry Pi, ESP32 and STM32 are mentioned, but the concrete code snippets are missing from the provided source; integration therefore requires additional documentation.
  • The maximum frame rate is stated as 32 Hz in the FAQ, while the specification allows up to 64 Hz – please verify which figure applies to your project.

Source and revision record

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