Key coding circuit
First Claim
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1. A key coding circuit, comprising:
- a ground wire;
N keys, each key comprising an input end and a ground end electrically connected to the ground wire;
a signal processing unit comprising M signal lines, M being the smallest positive whole number not less than Log(N+1,
2), and at least one signal line electrically connected to the corresponding input end; and
a bus electrically connected to the signal lines, wherein each key is coded for M-bit binary, the floating signal lines correspond to the binary code 1, and the signal lines corresponding to binary code 0 are electrically connected to the input end of the corresponding keys.
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Abstract
A key coding circuit includes N keys, a signal processing unit, a bus, and a ground wire, and each key includes an input end and a ground end electrically connected to the ground wire. The signal processing unit includes M signal lines, where M is the smallest positive whole number not less than Log(N+1, 2), and at least one signal line is electrically connected to the corresponding input end. Each key is coded for M-bit binary, the floating signal lines correspond to the binary code 1, and the signal lines corresponding to binary code 0 are electrically connected to the input end of the corresponding keys.
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Citations
7 Claims
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1. A key coding circuit, comprising:
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a ground wire; N keys, each key comprising an input end and a ground end electrically connected to the ground wire; a signal processing unit comprising M signal lines, M being the smallest positive whole number not less than Log(N+1,
2), and at least one signal line electrically connected to the corresponding input end; anda bus electrically connected to the signal lines, wherein each key is coded for M-bit binary, the floating signal lines correspond to the binary code 1, and the signal lines corresponding to binary code 0 are electrically connected to the input end of the corresponding keys. - View Dependent Claims (2, 3, 4)
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5. A key coding circuit, comprising:
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a ground wire; N keys, each key comprising an input end and a ground end, the ground end electrically connected to the ground wire; an electrostatic protection unit for discharging static electricity comprising M signal lines, M being the smallest positive whole number not less than Log(N+1,
2), and at least one signal line electrically connected to the corresponding input end;a bus electrically connected to the signal line for transmitting level signals; and a signal processing unit electrically connected to the electrostatic protection unit, wherein each key is coded for M-bit binary, the floating signal lines correspond to the binary code 1, the signal lines corresponding to binary code 0 are electrically connected to the input end of the corresponding keys, and the signal processing unit scans signal lines to obtain corresponding codes. - View Dependent Claims (6, 7)
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Specification