Single wire serial interface
First Claim
1. A power integrated circuit for controlling a light source, the power integrated circuit comprising:
- a counter that generates a count value based on pulses encoded in a signal received at a single input of the power integrated circuit;
output circuitry that outputs, via at least one output of the power integrated circuit, at least one lighting control state utilized to control the light source based at least in part on the count value; and
sensing circuitry that determines whether the signal is high or low so that (i) at least one lighting control state is maintained while the signal is high, and (ii) the count value is reset in response to the signal being low for a period that exceeds a predetermined timeout value, the predetermined timeout value being longer than a width of one of the pulses.
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Accused Products
Abstract
A single wire serial interface for power ICs and other devices is provided. To use the interface, a device is configured to include an EN/SET input pin. A counter within the device counts clock pulses sent to the EN/SET input pin. The output of the counter is passed to a ROM or other decoder circuit. The ROM selects an operational state for the device that corresponds to the value of the counter. In this way, control states may be selected for the device by sending corresponding clock pulses to the EN/SET pin. Holding the EN/SET pin high causes the device to maintain its operational state. Holding the EN/SET pin low for a predetermined timeout period resets the counter and causes the device to adopt a predetermined configuration (such as off) until new clock pulses are received at the EN/SET pin.
113 Citations
30 Claims
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1. A power integrated circuit for controlling a light source, the power integrated circuit comprising:
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a counter that generates a count value based on pulses encoded in a signal received at a single input of the power integrated circuit; output circuitry that outputs, via at least one output of the power integrated circuit, at least one lighting control state utilized to control the light source based at least in part on the count value; and sensing circuitry that determines whether the signal is high or low so that (i) at least one lighting control state is maintained while the signal is high, and (ii) the count value is reset in response to the signal being low for a period that exceeds a predetermined timeout value, the predetermined timeout value being longer than a width of one of the pulses. - View Dependent Claims (2, 3)
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4. A power integrated circuit for controlling a Light Emitting Diode (LED) light source, the power integrated circuit comprising:
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a first input pin that receives a signal, the signal having pulses, each of the pulses including a transition from a first level to a second level and a transition from the second level to the first level; at least one output pin; and an LED driver circuit in communication with the first input pin and the at least one output pin, the LED driver circuit including (i) a counter that generates a count value based on the pulses encoded in the signal received on the first input pin, (ii) at least one output that outputs via the at least one output pin at least one lighting control state utilized to control the LED light source based at least in part on the count value, and (iii) sensing circuitry that determines whether the signal is at the first level or the second level so that the lighting control state is maintained while the signal is at the second level on the first input pin, and the count value is reset in response to the signal on the first input pin being at the first level for a period that exceeds a predetermined timeout value, the predetermined timeout value being longer than a width of one of the pulses. - View Dependent Claims (5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
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21. A method for controlling a Light Emitting Diode (LED) light source using a power integrated circuit, the method comprising:
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receiving at a single input of the power integrated circuit a signal having pulses, each of the pulses including a transition from a first level to a second level and a transition from the second level to the first level, the pulses encoding a desired lighting control state; generating a count value based on the pulses in the signal received via the single input of the power integrated circuit; outputting via at least one output pin, at least one lighting control state utilized to control the LED light source based at least in part on the count value; maintaining the at least one lighting control state while the signal is at the second level; and resetting the count value when the signal is at the first level for a period that exceeds a predetermined timeout value, the predetermined timeout value being longer than a width of one of the pulses. - View Dependent Claims (22, 23, 24, 25, 26, 27, 28, 29, 30)
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Specification