SMK Develops Capacitive Sensing Hybrid IC
with No Software Development Required

   SMK has developed a capacitive sensing hybrid integrated circuit (IC) that can measure the capacitance value. By attaching electrodes to the outside of the container and connecting them to this IC, it enables non-contact sensing of objects inside the container. For example, it can detect whether the liquid level has reached a preset level without directly touching the liquid. This makes it ideal for applications such as checking the remaining amount or fullness of liquid food or medical equipment, where hygiene is a concern.
   This product features a microcontroller-less configuration and requires no software, whereas capacitance measurement typically requires a dedicated microcontroller and software. This reduces development time and cost and enables a low-cost capacitive sensing system.
   It is highly customizable according to container specifications and sensing objectives. Various settings are possible by adjusting external resistors and diodes and reconfiguring the wiring.
   In addition, unlike float-type* sensors, the capacitive liquid level sensor with SMK’s IC has no contact with the object or moving parts, which contributes to ease of maintenance in addition to the hygienic benefits.
   This product can also be used for various applications such as detecting objects other than liquids.

* Float liquid level sensor:
A float with a magnet inside rises and falls according to the liquid level in the container. The amount of liquid is detected by measuring the magnetism from outside the container.