Holtek Semiconductor Corp.

Min-Kun Wang

Chi-Ho Hsu

Fang-Diahn Guo

Wen-Ping Cheng

Chuen-An Lin

Chih-Heng Chen

Min-Hsiung Hu

A two-wire serial handshaking communication interface and a method thereof is provided for a transmission of a data bit representative between a first transmitting component and a second transmitting component, wherein the first transmitting component includes a first input/output unit and a second input/output unit and the second transmitting component has a third input/output unit and a fourth input/output unit, wherein the first input/output unit and the second input/output unit transmit a first signal through a first transmitting line electrically connected therebetween and the third input/output unit and the fourth input/output unit transmit a second signal transmitted through a second transmitting line electrically connected therebetween without strict constraint on communication timing.

Two-wire serial handshaking communication interface and method thereof

A universal series bus (USB) frequency synchronous apparatus using a start of frame (SOF) signal generated by a master device to mark a reference interval is disclosed. The frequency synchronizing apparatus includes a frequency divider, a counter unit with a default pulse number, an arithmetic unit, and an adjusting unit. The frequency divider divides a high frequency signal by a variable frequency factor to generate a lock frequency signal. The counter is used to detect a pulse number of the lock frequency signal at a reference interval and obtain a pulse difference between the default pulse number and the detected pulse number of the lock frequency signal.

USB frequency synchronizing apparatus and method of synchronizing frequencies

An environment monitoring integrated circuit is provided that allows the boundaries of operating parameters to be conveniently modified. The present invention allows the hardware designer to easily change the temperature boundary of the computer operation, or the boundaries of the operating voltage, the operating temperature and the rotation speed of the fan. The present invention uses limit registers which provide a simple implementation for changing the boundaries of the operating parameters of the computer.

Computer environment monitor device

A photocoupling signal detection circuit for a computer mouse to simplify the design of circuit by tracking the slope change of input voltage waveform and produce a digital output which can detect the movement of computer mouse is disclosed. This signal detection circuit includes a comparator, a state decision circuit, an up/down counter, and a D/A converter. The comparator produces an up/down signal connected to the state decision circuit, then the up/down signal connected to the up/down counter to transfer the up/down signal into a digital signal output. The digital signal connected to a D/A converter for transferring into an analog signal, and the analog signal can be compared with the output signal of an phototransistor. According to the state of up/down signal, the state decision circuit determines if the phototransistor is turned on or turned off and outputs different state signals, based on its determination. The output state signal is further utilized for the detection of a computer mouse.

Growing community of inventors

Hsinchu, Taiwan

Min-Kun Wang