Controller arrangement
First Claim
Patent Images
1. A control circuit, comprising:
- a single input terminal for receiving digital control signals and analog control signals;
said digital signals being in a first digital state when below a first level, and being in a second digital state when above a second level;
said analog signals being within a range that is greater than said first level and less than said second level;
a comparator circuit coupled to said single input terminal for providing a first output when the level at said single input terminal is below said first level or when the level at said single input terminal is above said second level;
said comparator circuit providing a second output when the level at said single input terminal is between said first level and said second level;
whereby said first output indicates that a signal at said single input terminal is a digital signal and said second output indicates that a signal at said single input terminal is an analog signal.
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Abstract
A control circuit is described in which a single input terminal receives digital control signals and analog control signals. A circuit coupled to the single input provides a first output to indicate that a signal at said single input terminal is a digital signal and a second output indicates that a signal at said single input terminal is an analog signal.
11 Citations
6 Claims
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1. A control circuit, comprising:
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a single input terminal for receiving digital control signals and analog control signals;
said digital signals being in a first digital state when below a first level, and being in a second digital state when above a second level;
said analog signals being within a range that is greater than said first level and less than said second level;
a comparator circuit coupled to said single input terminal for providing a first output when the level at said single input terminal is below said first level or when the level at said single input terminal is above said second level;
said comparator circuit providing a second output when the level at said single input terminal is between said first level and said second level;
whereby said first output indicates that a signal at said single input terminal is a digital signal and said second output indicates that a signal at said single input terminal is an analog signal. - View Dependent Claims (2, 3)
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4. A method of operating a control circuit, comprising:
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receiving, at a single input terminal, signals that may be digital signals and analog control signals;
determining whether the level of a signal at said single input terminal is below a first level;
determining whether said level of said signal at said single input terminal is above said second level;
providing a first output if said level is below said first level or if said level is above said second level; and
providing a second output if said level is between said first level and said second level;
whereby said first output indicates that a signal at said single input terminal is a digital signal and said second output indicates that a signal at said single input terminal is an analog signal. - View Dependent Claims (5, 6)
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Specification