Differentiating between input ranges in a passive keypad

H - Electricity – 03 – M

Patent

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Details

H03M 11/24 (2006.01) H03M 1/36 (2006.01)

Patent

CA 2333003

A method and circuit for processing switch closures in a passive network (100) having switches (S i ... S n). The passive network (100) generates an output voltage in response to a switch closure. The circuit comprises a comparison circuit (206), coupled to the passive network, for comparing the output voltage to a reference voltage. A decoder (212), coupled to the comparison circuit, decodes the switch closure if the output voltage is within a predetermined range, and does not decode said switch closure if the output voltage is not within the predetermined range. The circuit differentiates between input ranges in a passive network keypad which allows the proper processing of meaningful key presses, while ignoring inadvertent or superfluous key presses, thereby conserving power and processor time.

L'invention concerne un procédé et un circuit de traitement de fermetures de commutateur dans un réseau (100) passif comportant des commutateurs (S1 ... Sn). Le réseau (100) passif génère une tension de sortie en réponse à une fermeture de commutateur. Le circuit comprend un circuit de comparaison (206) couplé au réseau passif, permettant de comparer la tension de sortie à une tension de référence. Un décodeur (212) couplé au circuit de comparaison décode la fermeture du commutateur si la tension de sortie se trouve dans une gamme prédéterminée, et ne décode pas la fermeture du commutateur si la tension de sortie ne se trouve pas dans la gamme prédéterminée. Le circuit établit une différence entre les gammes d'entrée dans un clavier de réseau passif qui permet un traitement approprié de touches directes significatives tout en ignorant des touches directes accidentelles ou superflues, ce qui permet de gagner en puissance et en temps de traitement.

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