Single wire serial interface
DCFirst Claim
1. A backlight driver, comprising:
- a first circuit for generating a count value by counting clock pulses, a second circuit for generating a control state for a light source in response to the count value, a third circuit for generating a drive voltage for the light source in response to the control state, and a fourth circuit for resetting the count value to zero in response to a received 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 clock pulses.
2 Assignments
Litigations
1 Petition
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.
101 Citations
29 Claims
-
1. A backlight driver, comprising:
a first circuit for generating a count value by counting clock pulses, a second circuit for generating a control state for a light source in response to the count value, a third circuit for generating a drive voltage for the light source in response to the control state, and a fourth circuit for resetting the count value to zero in response to a received 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 clock pulses. - View Dependent Claims (2, 3)
-
4. A backlight driver, comprising:
-
an input pin configured to be able to receive power from a power source; a light emitting diode (LED) driver circuit in communication with the input pin and configured to drive a plurality of LEDs, the LED driver circuit including a first circuit configured to generate a count value by counting clock pulses, a second circuit configured to generate a control state in response to the count value, and a boost converter configured to generate a boosted-output in response to the control state, the boosted-output configured to control brightness of the plurality of LEDs; and an output pin in communication with the LED driver circuit and configured to output the boosted-output for the plurality of LEDs. - View Dependent Claims (5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19)
-
-
20. A method for driving a backlight circuit, the method comprising:
-
receiving power from a power source; generating a count value by counting pulses; generating a control state in response to the count value; generating a boosted-output of the received power in response to the control state; and providing the boosted-output to a plurality of light emitting diodes (LEDs) of the backlight circuit to thereby control brightness of the plurality of LEDs. - View Dependent Claims (21, 22, 23, 24, 25, 26, 27, 28, 29)
-
Specification