Capacitive board design components must be used, its quality has become a very important aspect of the quality of our board. In recent years, with the popularity of smart touch screen, capacitive touch IC has been unprecedented rapid development, the following for everyone driving school capacitive touch IC principle and application.
Theory:
Capacitive touch IC USES very much, a miniature electronic devices or components mainly, adoption of a certain process, make a circuit of the transistor, the diode, resistance, capacitance and inductance and components and wiring interconnection together, make on a small piece or a few small piece of semiconductor wafer or medium substrate, and then encapsulated in a tube and shell inside, as has the required the micro structure of circuit function; All the components have been integrated into a whole in structure, which makes the electronic components step forward to miniaturization, low power consumption and high reliability. It is represented in circuits by the letter "IC".
Application of capacitive touch IC:
1. Dc isolation: the function is to let the resistance value of DC pass through and ac pass through
1. Dc isolation: the function is to let the resistance value of DC pass through and ac pass through2, bypass: also decoupling, that is, to provide a low impedance path for some of the parallel elements in the AC circuit.
3. Coupling: As a connection between two circuits, allowing ac signals to pass through and transmit to the next circuit.
4. Filtering: This is very important for DIY. The capacitor on the video card is basically used for this purpose.
5. Temperature compensation: Compensate for the impact of other components' insufficient adaptability to temperature to improve the stability of the circuit.
6. Timing: capacitor and resistor are used together to determine the time constant of the circuit.