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RAK12052 WisBlock Thermal IR Array Module Datasheet

Overview​

Figure 1: RAK12052 WisBlock Thermal IR Array Module

Description​

RAK12052 is a 32 x 24 thermal IR array module based on MLX90640 from Melexis. MLX90640 is a fully-calibrated 32 x 24 pixels thermal IR array in an industry-standard 4-lead TO39 package with a digital interface. The MLX90640 contains 768 FIR pixels. An ambient sensor is integrated to measure the ambient temperature of the chip, and a supply sensor to measure the VDD. The outputs of all sensors IR, Ta, and VDD are stored in internal RAM and accessible through I2C. It is comparable in having a thermal camera (or Predator's vision) but in compact but useable low resolution.

Applications​

  • High precision non-contact temperature measurements
  • Intrusion or Movement Detection
  • Presence Detection or Person Localization
  • Temperature sensing element for intelligent building air conditioning
  • Thermal Comfort Sensor in automotive air conditioning control system
  • Microwave oven
  • Industrial temperature control of moving parts
  • Visual IR thermometers

Features​

Module Specifications

  • Easy to integrate
  • Factory calibrated
  • Noise Equivalent Temperature Difference (NETD) 0.1K RMS @ 1 Hz refresh rate
  • I2C compatible digital interface
  • FOV options – 55° x 35°
  • Current consumption less than 23 mA
  • Power Supply：3.3 V
  • Operating Temperature: -40° C ~ 80° C

Specifications​

Mounting​

Mounting to WisBlock Base​

The RAK12052 32 x 24 IR module can be mounted to the IO slot of the WisBlock base board. Figure 2 shows the mounting mechanism of the RAK12052 on a WisBlock Base Board module.

Figure 2: RAK12052 WisBlock Thermal IR Array Module Mounting

Hardware​

The hardware specification is categorized into five (5) parts. It shows the chipset of the module and discusses the pinouts, and their corresponding functions and diagrams. It also covers the electrical and mechanical parameters that include the tabular data of the functionalities and standard values of RAK12052 WisBlock Thermal IR Array Module.

Chipset​

VendorPart Number
MelexisMLX90640

Pin Definition​

The RAK12052 WisBlock 32 x 24 IR module comprises a standard WisBlock IO slot connector. The WisBlock IO slot connector allows the RAK12052 module to be mounted to a WisBlock Base Board module. The pin order of the connector and the pinout definition is shown in Figure 3.

NOTE

I2C related pins, 3V3_S, and GND are connected to WisBlock IO slot connector.

Figure 3: RAK12052 WisBlock Thermal IR Array Module Pinout

Electrical Characteristics​

This table shows the RAK12052 module electrical characteristics.

SymbolDescriptionMin.Nom.Max.Unit
3V3_SPower Supply Voltage-3.3V

Mechanical Characteristic​

Board Dimensions​

Figure 4 shows the dimensions and the mechanical drawing of the RAK12052 module.

Figure 4: RAK12052 WisBlock Thermal IR Array Module Mechanical Drawing
WisConnector PCB Layout​
Figure 5: WisConnector PCB footprint and recommendations

Schematic Diagram​

Figure 6 shows schematic diagram of RAK12052 module.

The I2C address of RAK12052 is 0110011. R10 and R11 are not populated on the RAK12052 due to the pull-up resistors already on the WisBlock Base Board.

Figure 6: RAK12052 WisBlock Thermal IR Array Module Schematic
Pixel Position​

The array consists of 768 IR sensors (also called pixels). Each pixel is identified with its row and column position as Pix (i, j), where i is the row number (from 1 to 24) and j is the column number (from 1 to 32).

Figure 7: Pixel in the whole FOV
Figure 8: RAK12052 WisBlock 32x24 IR Module View