CDC technology helps arm force capacitive touch to create multiple medical applications
The application of capacitive touch sensing in medical care will be more diverse. With capacitive digital conversion (CDC) technology, the capacitive touch sensor can not only measure the external capacitance change value smoothly, but also convert it into a digital signal and provide it to the main processor to ensure the reliability of the sensor and help expand the capacitance The application of touch sensors in the field of medical care.
In recent years, advances in electronic technology have enabled many innovative ideas in the medical care industry to be realized and improved. Challenges for medical care equipment include developing new diagnostic and treatment methods, implementing remote monitoring and home medical care devices, improving quality and reliability, and enhancing flexibility and ease of use. This article will discuss how Capacitive to Digital Converter (CDC) technology enables medical care applications to use high-performance capacitive touch sensing.
Provide novel use input mode capacitive touch sensor controller
The capacitive touch sensor can provide a user interface type with buttons, slider bars, scroll wheels, or other similar to those shown in FIG. 1.
Figure 1 Example of touch sensor layout
Each gray geometric area represents a sensor electrode on a printed circuit board (PCB), which is combined to form a board of virtual capacitors; the other board is formed by the user's finger and is basically a grounded sensor input , A capacitive touch sensor controller designed for starting and interfacing capacitive touch sensors, to measure changes in capacitance from single-electrode sensors. The device will first output a set of trigger signals to charge the capacitor plate. And when there is an object, such as the user's finger close to the sensor, a virtual capacitor will be formed, and the user will become the second group of capacitor plates (Figure 2). Capacitance measurement is performed using CDC.
Figure 2 Capacitive sensing demonstration and typical response
The CDC, which can sense changes in the capacitance of external sensors, uses this information to activate a set of sensors. Capacitive touch sensor controllers with 13 and 8 sets of capacitive sensor inputs, respectively, have built-in correction logic on the chip to compensate for measurement changes caused by changes in the surrounding environment, thereby ensuring that external sensors are Changes in temperature or humidity cause false triggers.
The capacitive touch sensor controller provides different operating modes, user-programmable conversion sequencing, and very flexible control features. These characteristics make them very suitable for high-resolution touch sensor functions, such as sliders or scroll wheels, etc., and have minimal software requirements. In addition, the application of the button sensor can also be fully realized using the digital logic built into the chip without any software.
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