Abstract: LED drivers specially directed to LED matrix driver's ghost image prevention is disclosed. The LED driver receives an external input and decodes the input to produce a time multiplex timing on turning on an LED array. The LED driver inserts a dead time to the outputs and during this time the ghost image prevention circuit discharges the output stray capacitances to a predetermined level.

Abstract: An apparatus for synchronizing light signals to a music input signal includes an analog to digital converter to generate a digital signal equivalent of the analog music input signal, an digital signal decoder to generate an output pulse width modulated signal that is representative of the tempo and the volume of the music input signal, a light driver unit that receives the output pulse width modulated signal to correspondingly light up a lighting unit, and a lighting unit that emits light. Thus, light brightness synchronizes with the music volume amplitude, and the light blinks on and off with the music tempo and beating.

Abstract: An apparatus to detect faulty connection of LED (open/short conditions) which may affect the function of LED display panel is presented. The apparatus basically controls the switches through control algorithm circuit to get the information of LED driver output pins voltage and compare them with two reference voltages to determine the open/short condition of individual LED.

Abstract: An ON-OFF timer circuit for use in a DC-DC converter to minimize or eliminate the risk of developing sub-harmonic oscillations that may cause the dc-dc system to be unstable is presented. The apparatus controls and limits the ‘On’ time duration and ‘Off’ time duration within one pulse cycle.

Abstract: An apparatus for synchronizing light signals to a music input signal includes an analog to digital converter to generate a digital signal equivalent of the analog music input signal, an digital signal decoder to generate an output pulse width modulated signal that is representative of the tempo and the volume of the music input signal, a light driver unit that receives the output pulse width modulated signal to correspondingly light up a lighting unit, and a lighting unit that emits light. Thus, light brightness synchronizes with the music volume amplitude, and the light blinks on and off with the music tempo and beating.

Abstract: A protection circuit for protecting DCDC converter with a power MOS transistor from start-up in-rush current includes a coupling capacitor and a voltage clamping circuit. By using the coupling capacitor to turn-off the power MOS transistor, there is no current consumed during the normal operation of the circuit. Enable signal or leakage current circuit is used to discharge the capacitor so that the circuitry can work in another turning-on of power supply.

Abstract: LED drivers specially directed to LED matrix driver's ghost image prevention is disclosed. The LED driver receives an external input and decodes the input to produce a time multiplex timing on turning on an LED array. The LED driver inserts a dead time to the outputs and during this time the ghost image prevention circuit discharges the output stray capacitances to a predetermined level.

Abstract: An apparatus to detect faulty connection of LED (open/short conditions) which may affect the function of LED display panel is presented. The apparatus basically controls the switches through control algorithm circuit to get the information of LED driver output pins voltage and compare them with two reference voltages to determine the open/short condition of individual LED.

Abstract: A method and apparatus to enhance the direction navigation capabilities of GPS-enabled devices, through the use of light indicators is proposed. The light indicators are positioned on the top, bottom, and sides of the GPS screen. The light indicators blink at different rates relatively to a distance to a destination. The light indicators show various effects to indicate various instructions, such as to go forward direction, to go onto an overhead bridge, to enter into an underground tunnel.

Abstract: An apparatus for selecting either a High VIN path or a Low VIN path from a voltage source to a low voltage circuit is disclosed. The apparatus has a clamped step down circuit operable to select the High VIN path when a voltage level from the voltage source is above or equal to a pre-determined voltage level and, a power supply control circuit operable to select the Low VIN path when the voltage level from the voltage source is below the pre-determined voltage level.

Abstract: An ESD protection circuit for reducing the regulator output capacitance includes a ground isolation circuit or a VCC isolation circuit to isolate regulator output from ground terminal or VCC terminal whenever ESD occurs, causing dropping of the differential voltage between regulator output and ground. The isolation circuits function to minimize the leakage current.

Abstract: An output short to ground protection circuit protects an electronic device when it is short circuited to ground. The protection circuit has an NMOS transistor coupled to the output power transistor. A fixed voltage generator is connected to a gate terminal of the NMOS transistor. A first voltage clamping circuit and a second voltage clamping circuit are provided. The voltage clamping circuits are utilized so as to limit the current outputted by the output power transistor when the short circuit occurs.

Abstract: A swing display device includes a CPU which calculates and produces synchronizing signal relative to the length of the message to be displayed. Learning the speed of the synchronizing signal, the user swings the swing display device back-and-forth according to the synchronizing signal to produce the image in the air.

Abstract: A protection circuit for protecting DCDC converter with a power MOS transistor from start-up in-rush current includes a coupling capacitor and a voltage clamping circuit. By using the coupling capacitor to turn-off the power MOS transistor, there is no current consumed during the normal operation of the circuit. Enable signal or leakage current circuit is used to discharge the capacitor so that the circuitry can work in another turning-on of power supply.

Abstract: An ON-OFF timer circuit for use in a DC-DC converter to minimize or eliminate the risk of developing sub-harmonic oscillations that may cause the dc-dc system to be unstable is presented. The apparatus controls and limits the ‘On’ time duration and ‘Off’ time duration within one pulse cycle.

Abstract: A method and apparatus to prevent I2C device from hanging the I2C data bus and thus stopping other devices in the system from transmitting or receiving data is presented. A logic transition detector detects a logic transition at the output data line of an I2C device and triggers a timer. The timer starts counting after it is triggered. A reset module resets the I2C interface module in the I2C device after the timer counts to a specified period of time. The timer is reset when the logic transition detector detects another logic transition at the output data line of the I2C device.

Abstract: A method and exemplary apparatus that incorporate soft-start circuit together with adjustable output voltage control are introduced. By implementing a gradual increment of voltage steps/fast decrement, it can totally eliminate overshoot and limit in-rush current significantly at the initial startup and output voltage transition that happens after startup.

Abstract: A method of improving voltage detection accuracy and precision by employing a switchable resistor epi bias design, which consists of switches to control connection of resistor epi bias. By constantly maintaining the resistor epi bias to its own resistor terminal bias via switches, higher accuracy detection than conventional resistor bias method can be achieved.

Abstract: A large current flowing out from video signal line driver is prevented whenever the video signal line is being grounded. The system includes a video signal line driver circuit transmitting video signal at pre-determined DC level, a large current prevention circuit detecting video signal line being shorted to ground and cut-off excessive current source out from video signal line driver circuit into video signal line, a start-up time enhancement circuit improving start-up time of ground detection circuit so that system start-up time is not limited by large current prevention circuit, and a switching threshold control circuit setting the switching threshold of large current prevention circuit and start-up time enhancement circuit.

Abstract: A method of optimizing the usage of communication buses is disclosed. In this method, a slave may function, when necessary, as a ‘pseudo-master’. This allows direct communication between slaves, one of which functions as a ‘pseudo-master’. This hence relieves the Master device of the load required as an intermediary for the communication of said slaves.