SYSTEM AND METHOD FOR SENSING MULTIPLE USER INPUT SWITCH DEVICES
First Claim
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1. A system comprising:
- a plurality of user input switch devices that are each configured to be switched between two states, each of the user input switch devices being connected to a node and connected in parallel to each other; and
a sense circuit electrically connected to the user input switch devices through the node, the sense circuit being configured to generate a sense current that corresponds to an electrical current through the node when at least one of the user input switch device is switched to one of the two states, the sense circuit being configured to produce multiple output signals based on the sense current, wherein the multiple output signals indicate current states of the user input switch devices.
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Abstract
A system and method for sensing multiple user input switch devices uses a generated sense current that corresponds to an electrical current through a node to which the user input switch devices are connected to sense current states of the user input switch devices. The sense current is used to produce multiple output signals that indicate the current states of the user input switch devices.
27 Citations
20 Claims
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1. A system comprising:
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a plurality of user input switch devices that are each configured to be switched between two states, each of the user input switch devices being connected to a node and connected in parallel to each other; and a sense circuit electrically connected to the user input switch devices through the node, the sense circuit being configured to generate a sense current that corresponds to an electrical current through the node when at least one of the user input switch device is switched to one of the two states, the sense circuit being configured to produce multiple output signals based on the sense current, wherein the multiple output signals indicate current states of the user input switch devices. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A system comprising:
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a plurality of user input switch devices that are each configured to be switched between two states, each of the user input switch devices being connected in parallel to each other, each of the user input switch devices being connected in series with one of a plurality of resistors between a node and a low voltage rail; and a sense circuit electrically connected to the user input switch devices through the node, the sense circuit being configured to generate a sense current that corresponds to an electrical current through the node when at least one of the user input switch device is switched to one of the two states, the sense circuit being configured to produce multiple output signals based on the sense current, wherein the multiple output signals indicate current states of the user input switch devices. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17)
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18. A method for sensing multiple user input switch devices, the method comprising:
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providing a supply power to the user input switch devices through a node to which each of the user input switch devices is connected, each of the user input switch devices being configured to be switched between two states; generating a sense current that corresponds to an electrical current through the node when at least one of the user input switch device is switched to one of the two states at a sense circuit connected to the user input switch devices through the node; and producing multiple output signals based on the sense current at the sense circuit, wherein the multiple output signals indicate current states of the user input switch devices. - View Dependent Claims (19, 20)
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Specification