Control circuit having multiple functions set by a single programmable terminal
First Claim
1. A control circuit having at least one programmable pin associated therewith, comprising:
- a programmable circuit operating in at least first and second program modes, each of said first and second program modes operable according to distinct timing parameters;
at least first and second program elements connected to said at least one programmable pin and at least one of said at least first and second program elements being associated with only one of said at least first and second program modes of said programmable circuit for defining said timing parameters for said only one of said at least first and second program modes; and
said programmable circuit and at least one of the remaining of said at least first and second program elements operable to define said timing parameters associated with at least one of the remaining of said at least first and second program modes.
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Accused Products
Abstract
A control circuit is provided which includes a single programmable terminal for controlling a plurality of modes, functions or parameters in a programmable circuit with a minimum of program elements connected to the single programmable terminal. The program elements may illustratively be resistors, capacitors, inductors or other circuit components. In a first mode, for example, two program elements control a signal generating function in the programmable circuit. In a second mode, a voltage provided internally forces a condition at the programmable terminal to control another signal generating function. In both first and second modes, the values of the program elements, selectable by the user, also determine the particular frequencies of the respective generated signals. In a third mode, the signals generated in the first and second modes are compared to provide a control function. There is further provided an absolute value comparator responsive to either polarity of an input sense signal applied to a single sense terminal. A switched output results when the input exceeds a temperature compensated systematic offset inherent to the comparator without requiring any external threshold signal.
111 Citations
64 Claims
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1. A control circuit having at least one programmable pin associated therewith, comprising:
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a programmable circuit operating in at least first and second program modes, each of said first and second program modes operable according to distinct timing parameters;
at least first and second program elements connected to said at least one programmable pin and at least one of said at least first and second program elements being associated with only one of said at least first and second program modes of said programmable circuit for defining said timing parameters for said only one of said at least first and second program modes; and
said programmable circuit and at least one of the remaining of said at least first and second program elements operable to define said timing parameters associated with at least one of the remaining of said at least first and second program modes. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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17. A signal generator operable in a plurality of programmable modes according to settable operating parameters, comprising:
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a relaxation oscillator having first and second inputs, an output, and first and second feedback loops coupled from said output to said first input;
a switch for selecting said first feedback loop or said second feedback loop; and
a programming terminal coupled to said first input for setting operating parameters in said programmable modes. - View Dependent Claims (18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34)
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35. A control system operable in a plurality of programmable modes, comprising:
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a signal generator having at least first and second selectable feedback networks;
a programmable terminal coupled to said selectable feedback networks and to an input of said signal generator for connecting at least first and second program elements for defining operating parameters associated with each of said programmable modes; and
a mode switch for selecting one of said feedback networks according to one of said plurality of programmable modes. - View Dependent Claims (36, 37, 38, 39, 40, 41)
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42. A method of programming a control circuit having at least one programmable pin associated therewith, comprising:
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providing a programmable circuit operating in at least first and second program modes, each of said at least first and second program modes operable according to distinct timing parameters;
connecting at least first and second program elements to said at least one programmable pin and associating at least one of said at least first and second program elements with only one of said at least first and second program modes of said programmable circuit for defining the timing parameters for said only one of said at least first and second program modes; and
operating said programmable circuit and least one of the remaining of said at least first and second program elements to define the timing parameters associated with least one of the remaining of said at least first and second program modes. - View Dependent Claims (43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57)
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58. In a programmable control system operable in a plurality of programmable modes, a method for defining program operating parameters, comprising:
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generating first and second programmable mode control signals in a signal generator having at least first and second selectable feedback networks;
connecting at least first and second program elements for defining parameters associated with each of said programmable modes to a programming terminal coupled to said selectable feedback networks and to an input of said signal generator; and
selecting one of said feedback networks according to one of said programmable modes. - View Dependent Claims (59, 60, 61, 62, 63, 64)
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Specification