Keyboard scanning circuit
AssigneeChi Mei Communication Systems, Inc.
InventorCHIN-YUNG PENG
Life of this patent
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Abstract
A keyboard scanning circuit, comprising N wires, and [(2N−1)+(2N−1−1)N] switches divided into two switch groups, therein N is a natural number. Each switch includes a first contact and a second contact. the first contacts of the (2N−1) switches in the first switch group are connected to ground, the second contacts of the (2N−1) switches in the first switch group are connected to the wires in (2N−1) connectors. The first contacts of the (2N−1−1)N switches in the second switch group are connected to one of the wires, the second contacts of the (2N−1−1)N switches in the second switch group are connected to the nodes between the switch in the first switch group and the wires.
Claims6
A keyboard scanning circuit, comprising:
- N wires;
- and
- [(2N−1)+(2N−1−1)N] switches divided into two switch groups;
- wherein N is a natural number, each switch includes a first contact and a second contact, the first contacts of the (2N−1) switches in the first switch group are connected to ground, the second contacts of the (2N−1) switches in the first switch group are connected to the wires in (2N−1) connectors, the first contacts of the (2N−1−1)N switches in the second switch group are connected to one of the wires, the second contacts of the (2N−1−1)N switches in the second switch group are connected to the nodes between the switch in the first switch group and the wires.
Dependencies are inferred from the claim text.