High-impedance design of matrix keyboard driver circuit

Matrix keyboard is an important device for human-computer interaction. In the actual application scenario, the user generates an excitation signal through a keyboard button, sends it to the scanning circuit through the driving circuit, and finally transmits it to the processor circuit, thereby completing human-computer interaction. In this process, the driver circuit is responsible for transmitting signals, and the design of the driver circuit determines whether the entire system can work normally. After introducing a high-resistance design in the driving circuit, it can avoid the short circuit of the internal circuit of the matrix keyboard when multiple buttons are pressed at the same time, which can make the whole driving circuit more reliable.

With the rapid development of electronic information technology, more and more industrial control devices and mobile terminal devices are widely used, and these devices are commonly referred to as embedded systems. The IEEE (International Institute of Electrical and Electronics Engineers) defines an embedded system as “a device for controlling, monitoring, or assisting in the operation of machines and equipment.” In these embedded systems, the keyboard is an important means of human-computer interaction and one of the most widely used input devices. When there are fewer buttons, a separate keyboard is used. When there are more buttons, a matrix keyboard is used. The matrix keyboard is an important device for human-computer interaction [1]. In the actual application scenario, the user generates an excitation through a keyboard button, sends it to the scanning circuit through the driving circuit, and finally transmits it to the processor circuit, thereby completing human-computer interaction. The drive circuit is responsible for the signal transmission in the whole process. The design of the drive circuit determines whether the entire matrix keyboard can work normally.The introduction of a high-resistance design in the drive circuit can avoid short-circuiting of the internal circuit of the matrix keyboard when multiple buttons are pressed at the same time, making the entire drive circuit more reliable.

Send your message to us:

INQUIRY NOW
  • * CAPTCHA: Please select the Cup


Post time: Jan-03-2019
WhatsApp Online Chat !