Scanning circuit for pressure responsive array

G - Physics – 01 – L

Patent

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G01L 1/20 (2006.01) G01L 5/22 (2006.01)

Patent

CA 2205201

A scanning circuit for an array of pressure responsive sensor points which permits the sensitivity of the circuit to be controlled. In particular, the sensitivity of the circuit may be controlled by controlling a test and/or reference voltage used with the circuit and different sensitivity or resolutions may be provided for different areas of the array. The circuit also provides enhanced interelectrode isolation, permitting a single test voltage to be utilized to scan all sensor points on a given input electrode and further reduces the time required to scan the array by reducing trace capacitance discharge time and by inhibiting processing for sensor ports which are not of interest. The accuracy of pressures being sensed is also enhanced by adjusting the rest voltage to compensate for load variations.

La présente invention concerne un circuit de balayage pour un ensemble de points de captage sensibles à la pression, et qui autorise l'ajustement de sa sensibilité. En particulier, on réalise un tel ajustement en contrôlant une tension d'essai et/ou de référence utilisée avec ce circuit, différentes sensibilités ou résolutions pouvant être obtenues pour différentes zones de l'ensemble. Ce circuit permet aussi une amélioration de l'isolement entre électrodes, ce qui permet d'utiliser une seule tension de contrôle pour balayer tous les points de captage sur une électrode d'entrée donnée. Ce circuit réduit davantage le temps nécessaire pour balayer l'ensemble en réduisant le temps de décharge de la capacité trace et en empêchant le traitement de points de captage qui ne sont pas concernés. La précision des pressions détectées est également améliorée grâce au réglage de la tension de contrôle visant à compenser les variations de charge.

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