System for logic state detection
First Claim
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1. A logic state detection system for detecting the logic state of state changing devices, the logic state detection system comprising:
- at least one state changing device; and
a current detection circuit electrically coupled with the at least one state changing device, the current detection circuit operable to provide current and identify the logic state of the at least one state changing device as a function of a threshold current level wherein the current detection circuit comprises an automatic gain control circuit operable to perform voltage compensation to maintain the threshold current level as voltage supplying the current detection circuit varies.
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Abstract
A logic state detection system for detecting the state of at least one state changing device includes a scanning circuit and a current detection circuit. The scanning circuit selectively activates at least one output line electrically connected with the at least one state changing device. Current passes through the scanning circuit to the at least one output line that is activated. The current detection circuit determines whether the state changing device is in a conducting or a non-conducting state as a function of the current.
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Citations
39 Claims
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1. A logic state detection system for detecting the logic state of state changing devices, the logic state detection system comprising:
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at least one state changing device; and
a current detection circuit electrically coupled with the at least one state changing device, the current detection circuit operable to provide current and identify the logic state of the at least one state changing device as a function of a threshold current level wherein the current detection circuit comprises an automatic gain control circuit operable to perform voltage compensation to maintain the threshold current level as voltage supplying the current detection circuit varies. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A logic state detection system for detecting the logic state of state changing devices, the logic state detection system comprising:
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a scan block electrically coupled with at least one state changing device, the scan block operable to selectively pass current to the at least one state changing device; and
a current detection circuit electrically coupled with the scan block the current detection circuit operable to identify the logic state of the at least one state changing device as a function of the current wherein the current detection circuit comprises a current management circuit and an output driver circuit, the current management circuit operable to provide current to the scan block and monitor the magnitude of current provided. - View Dependent Claims (8, 9, 10, 11, 12)
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13. A logic state detection system for detecting the logic state of state changing devices, the logic state detection system comprising:
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a scanning circuit comprising a plurality of output ports each electrically coupled with a state changing device, the output ports selectively activated during one of a setup mode and a scan mode; and
a current detection circuit electrically coupled with the scanning circuit, the current detection circuit operable to supply current through the output ports during the setup mode and through selectively activated output ports during the scan mode, the current detection circuit operable to provide indication of the logic state of the state changing device as a function of the current during the scan mode. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24)
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25. A logic state detection system for detecting the logic state of a plurality of state changing devices, the logic state detection system comprising:
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a plurality of scan blocks electrically coupled with the state changing devices, wherein the scan blocks are operable to selectively pass current to at least one of the state changing devices;
a data processor electrically coupled with the scan blocks, the data processor operable to selectively direct the scan blocks with a serial data stream by selective enablement of each of the scan blocks;
a current detection circuit electrically coupled with the scan blocks and the first data processor, the current detection circuit operable to monitor the current passed by the scan blocks and indicate the logic state of the state changing devices as a function of a threshold current level; and
a high side interface circuit electrically connected with the scan blocks and the state changing devices, wherein the high side interface device is operable to provide an interface for state changing devices configured as high side state changing devices. - View Dependent Claims (26, 27, 28, 29, 30)
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31. A method of determining the logic state of a plurality of state changing devices, the method comprising:
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selectively activating one of a plurality of output lines, the output lines each electrically connected with at least one of the state changing devices;
passing current to the activated one of the output lines; and
indicating the logic state of the at least one of the state changing devices as a function of the current entering a setup mode;
activating all of the output lines;
passing current to the output lines to charge a plurality of capacitors; and
deactivating all the output lines. - View Dependent Claims (32, 33, 34, 35, 36, 37, 38)
transmitting a serial data stream to a plurality of scan blocks;
transmitting an enabling signal to one of the scan blocks; and
responding to the serial data stream with one of the scan blocks as a function of the enabling signal.
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34. The method of claim 31, wherein passing current to the activated one of the output lines comprises maintaining current flow that minimizes electromagnetic interference.
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35. The method of claim 31, wherein indicating the logic state of the one of the state changing devices comprises:
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monitoring the current magnitude; and
providing a signal indicative of the current magnitude with respect to a threshold current level.
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36. The method of claim 31, wherein indicating the logic state of the one of the state changing devices comprises temperature compensating to accurately monitor the current.
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37. The method of claim 31, wherein indicating the logic state of the one of the state changing devices comprises voltage compensating to accurately monitor the current.
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38. The method of claim 31, wherein indicating the logic state of the one of the state changing devices comprises selecting a threshold current level as a function of the anticipated current indicative of the logic state of the at least one state changing device.
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39. A method of determining the logic state of a plurality of state changing devices, the method comprising:
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selectively activating one of a plurality of output lines, the output lines each electrically connected with at least one of the state changing devices passing current to the activated one of the output lines;
indicating the logic state of the at least one of the state changing devices as a function of the current;
transmitting a serial data stream to a plurality of scan blocks;
transmitting an enabling signal to one of the scan blocks; and
responding to the serial data stream with one of the scan blocks as a function of the enabling signal.
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Specification