HOW DOES IT WORK?

IR Sense 4 Click is based on the STHS34PF80, a low-power, high-sensitivity infrared (IR) sensor from STMicroelectronics. The sensor has a high IR sensitivity and low RMS noise, and it is factory-calibrated and temperature-compensated. The sensor itself has an integrated IR filter, has an 80-degree field of view, and operates in a wavelength of 5μm to 20μm. It measures the object's radiation with unique TMOS technology to detect its presence or motion. When the object is inside the FoV, it is based on a matrix of floating vacuum thermal transistors connected together and acting as a single sensing element. The sensor is split into two parts, one exposed to IR radiation and the other shielded. Differential reading between the two parts is implemented to remove the effect of sensor self-heating.

IR Sense 4 Click can use a standard 2-wire I2C interface to communicate with the host MCU supporting clock frequency of up to 1MHz. It can also use a 3-wire SPI interface for the same purpose with a clock frequency of up to 10MHz. The selection can be made over the COMM SEL jumpers. The smart processing will detect or discriminate between stationary and moving objects and assert an interrupt INT pin.

This Click board™ can be operated only with a 3.3V logic voltage level. The board must perform appropriate logic voltage level conversion before using MCUs with different logic levels. Also, it comes equipped with a library containing functions and an example code that can be used as a reference for further development.

SPECIFICATIONS