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 MLX90615 
 Temperature sensors 

Compact non-contact infrared temperature sensor designed for embedded systems and space-constrained applications.

 Maximum precision
+/- 0,2°K

 Minimum temperature
-40°C

 Maximum temperature
+115°C

 Resolution
0,02°C

 Power supply voltage

3,0→3,6V

Response time

0,1s

 Typical current
1,5 mA

Price
Medium

What is a MLX90615 sensor ?Operating principleExample of digital conversion (I²C)Principle diagram (I²C connection)Application areas

What is an MLX90615 sensor?

The MLX90615 is a compact digital infrared sensor designed for non-contact temperature measurement, both of objects and living beings.

It follows the principle of the MLX90614 but comes in a package that is twice as small, with a limited range, making it ideal for:

  • portable medical thermometers,
  • embedded systems with limited space,
  • smart consumer products (watches, wearables, IoT).

Operating principle

The MLX90615 detects the infrared radiation emitted by an object via an integrated thermopile.

The signal is amplified, digitized, and compensated for by an internal DSP processor that corrects for ambient temperature effects.

Internal formula:

T_objet = (RawIR x 0,02) - 273,15

💡 The calculation includes automatic compensation for ambient temperature via the internal sensor.


Example of digital conversion (I²C)

Registre (hex) Description

Résolution

0x26

 Température ambiante

0,02 °C / LSB
0x27 Object temperature

0,02 °C / LSB
0x20 Emissivity (adjustable)

0xFFFF = 1,0

0x2E

I²C Address

Programmable (EEPROM)

T(°C) = (value x 0,02) - 273,15

Principle diagram (I²C connection)

+3.3V
 │
[MLX90615]
 │ SDA ───────┐
 │ SCL ───────┤── [I²C Microcontroller]
 │ GND

💡 Default I²C address: 0x5B.

Application areas

🏥 Medical thermometers (forehead, ear)

🧠 Connected devices and health watches

🏠 Home automation: thermal detection, HVAC

⚙️ Embedded electronics and autonomous robots

🧪 Contactless measurement on sensitive surfaces





Should I choose an MLX90615 sensor?

Strengths points

  • 🎯 High precision in the human range (0–60 °C)
         → Ideal for precise medical and environmental measurements.
  • 🧱 Format miniature (TO-46)
         → Integrates easily into compact and portable designs.
  • ⚡ Quick response (0.1 s)
         → Optimized sensor for dynamic body temperature detection.
  • 🔋 Low consumption
         → Only 1.5 mA in operation — perfect for battery-powered systems.

Weaknesses points

  • 🌡️ Limited measurement range
         → Inappropriate for high temperatures (>115 °C).
  • 📏 Fixed field of view (~35°)
         → Non-configurable, unlike some versions of the MLX90614.
  • 💨 Sensitive to dust and condensation
    → The IR lens must remain clean to maintain accuracy.

Useful information

Here is some useful information regarding the MLX90615 sensors.

Adress (hex) Name
 Description
0x20 Emissivity Adjust the emissivity constant
0x26 Tambient Internal temperature
0x27 Tobject Target object temperature
0x2E I²C Address Programmable address
0x2F Config Register Operating mode and frequency
0x10 PWM Output PWM output configuration
i2c_start();
i2c_write(0x5B << 1);
i2c_write(0x27);
i2c_start();
i2c_write((0x5B << 1) | 1);
LSB = i2c_read_ack();
MSB = i2c_read_nack();
i2c_stop();

raw = (MSB << 8) | LSB;
tempC = (raw * 0.02) - 273.15;

✅ Example:

Gross value = 16000 → Temperature = 46.85 °C

3.3V ───────────┐
                │
               [MLX90615]
                │ SDA ───────┐
                │ SCL ───────┤── MCU (Arduino, STM32, ESP32…)
                │ GND

💡 Ajouter un condensateur de découplage 100 nF entre VCC et GND pour la stabilité.

Matériau mesuré Émissivité typique
Métal poli 0,1
Aluminium brossé 0,3
Plastique noir 0,95
Peau humaine 0,98
Bois ou tissu 0,9
💡 Une mauvaise émissivité entraîne des écarts de mesure jusqu’à 2 °C.
Température (°C) Erreur (K)
−40 ±0,5
0 ±0,2
37 ±0,1
85 ±0,2
115 ±0,3
💡 Le MLX90615 est optimisé pour la plage physiologique : précis, stable et réactif.

 We integrate any sensor into any probe 

 Smooth tube 

 Waterproof

 Bayonet

 Slot

 Atmosphere

Termal block

Stick-in

Thread

Contact

Jacketed

PCBA design

Winding

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