Low power consumption matrix keyboard and power switch circuit using the matrix keyboard

Abstract

The embodiment of the invention provides a low power consumption matrix keyboard and a power switch circuit using the same. The matrix keyboard comprises a matrix unit, a trigger unit, a row switch unit, a column switch unit and a row and column switch control unit, wherein the matrix unit comprises M row lines and N column lines, the trigger unit comprises M row triggers and N column triggers, the setting end of each row trigger is connected with a row line, and the setting end of each column trigger is connected with a column line through an inverter. According to the technical scheme provided by the embodiment of the invention, whether a key is pressed and the location of the pressed key exists can be determined by collecting level values of the output ends of the row trigger and the column trigger, the process of real-timely and dynamically scanning the row lines and column lines of the matrix keyboard by using a clock oscillation circuit is no longer needed, so that the matrix keyboard provided by the embodiment of the invention only has relatively low static power consumption, does not have dynamic power consumption, and is relatively low in power consumption.

Description

Technical field [0001] The invention relates to the technical field of electronic circuits, in particular to a low-power matrix keyboard and a power switch circuit applying the matrix keyboard. Background technique [0002] Standby refers to a kind of hibernation state that the electronic device saves the currently running data in the memory when there is no user access. When in standby, electronic devices only supply power to some necessary hardware modules such as memory, but stop power to hardware modules such as screens and hard drives. Therefore, when there is no user access, setting the electronic device to standby mode can have an energy-saving effect. . On the contrary, when there is user access, it is necessary to wake up the electronic device, that is, adjust the electronic device from the standby mode to the working mode. [0003] In the related art, the keyboard is usually used to trigger the wake-up instruction of the electronic device. Among them, the matrix keyboar...

AI Technical Summary

Problems solved by technology

[0005] An embodiment of the present invention provides a low-power matrix keyboard and a power switch circuit using the matrix keyboard, so as to solve the problem that the dynamic power consumption of the power switch circuit is too high when the electronic equipment is in standby mode in the prior art

Images