For both applications, the Hall sensor is used to detect if the refrigerator door is open or closed. Both refrigerator doors are different from each other and therefore have different mechanical design. This means the Hall sensor and the magnet are positioned differently from each other. In other terms, if the user wants to detect a specific distance for both refrigerator doors, they must use either a different magnet or a different sensor. For the purpose of this application, there is no flexibility in the choice of magnet. The electronic board will also be reused across platforms and therefore will use the same sensor.

The TMAG5328 is a resistor adjustable Hall effect switch that allows the user to set up whatever threshold is needed between 2 mT and 15 mT.

For this application, the refrigerator door manufacturer can use the same printed circuit board (PCB) with the same semiconductor content and only has to change the resistor value depending on which refrigerator version is manufactured.

For both refrigerator doors, the opening angle is the same. Now refrigerator door 1 is a thinner model than refrigerator door 2. This means the PCB is located further away for refrigerator door 2 and therefore the sensitivity required to detect the position of the door will be impacted.

Knowing the door dimensions, the door opening angle required, and the distance from the magnet to the PCB, it is possible to use a simulation tool that will calculate the magnet strength at the desired position. For refrigerator door 1, the sensitivity calculated is 7.87 mT at a distance of 7.025 mm. For Refrigerator 2, the sensitivity is 3.49 mT at a distance of 16.08 mm. Based on those values, a resistor value can be selected from the E48 series. A resistor of 7.87 kΩ can be used for refrigerator door 1 and resistor of 3.48 kΩ can be used for refrigerator door 2.