KEYBOARD CIRCUIT

摘要

A keyboard circuit includes a CPU, a plurality of keys aligned in n rows and m columns, n first resistors, m second resistors, a first voltage output terminal, a second voltage output terminal, and a detection resistor. A first contact of each of the plurality of keys in a column is electronically connected to the first voltage output terminal by a second resistor, and a second contact of each of the plurality of keys in the column is grounded by the detection resistor. The first contact of each of the plurality of keys in a row is electronically connected to the second voltage output terminal by a first resistor. The CPU is grounded by the detection resistor and the first voltage output terminal alternates with the second voltage output terminal to output a voltage under control of the CPU.

主权项

1. A keyboard circuit, comprising:
a central processing unit (CPU); a plurality of keys aligned in a matrix fashion of n rows and m columns, where n and m are natural numbers; n first resistors corresponding to the n rows keys; m second resistors corresponding to the m columns keys; a first voltage output terminal; a second voltage output terminal; and a detection resistor; wherein a first contact of each of the plurality of keys aligned in a same column is electronically connected to the first voltage output terminal by a corresponding second resistor, a second contact of each of the plurality of keys aligned in the same column is grounded by the detection resistor; the first contact of each of the plurality of keys aligned in a same row is electronically connected to the second voltage output terminal by a corresponding first resistor; the CPU is grounded by the detection resistor and the first voltage output terminal alternates with the second voltage output terminal to output a voltage under control of the CPU.