| 摘要 |
A keyboard switch matrix arrangement provides keyboard key discrimination utilizing simultaneous groupings of drive line combinations and sense line combinations (time division multiplexing) to discriminate between keyboard keys with substantially fewer total drive and sense lines than a conventional switch matrix, thereby substantially reducing the number of required IC pin connections. The invention permits given sense lines to sense more than one drive line for a valid key press duration (i.e., key actuation), and given drive lines to drive more than one sense line for a given valid key press duration. In this manner, and through utilization of time division multiplexing, the switch capacity of a matrix with a given number of drive lines and sense lines can be substantially increased.
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