Abstract: Utilizing an asymmetric magnetic field caused by a mechanism design between a motor rotor and a stator to induce a BEMF, a method for starting a fixed rotation direction of single-phase sensorless DC brushless motor, includes: power-on starting a motor control circuit; if the motor is not in a rotating state before starting the excitation, executing a static starting procedure; then, if the motor rotation direction conforms to a predetermined direction, executing a normal driving procedure; otherwise, executing a static starting procedure. The static starting procedure, by discharging remnant energy of the motor, achieves the purpose of star-up by performing the steps of first phase excitation, stop excitation, and strong second phase excitation. In the normal driving procedure, the slope of BEMF signal of the first phase or the second phase is taken out periodically to detect the motor rotation direction.

Abstract: The invention discloses a driving method for single-phase DC brushless motor using sensor only in start-up, comprising: power-up to activate a motor control circuit of a motor; confirming whether the motor is in a rotating state before activation of an excitation? If not, executing a static start-up procedure of using a sensor to detect magnetic poles of the rotor; calculating slope of the BEMF signal to determine the rotation direction of the motor; determining whether the rotation direction of the motor conforming to a predetermined direction; if yes, executing a normal driving procedure; otherwise, executing the static start-up procedure of using a sensor to detect magnetic poles of the rotor. The invention utilizes the present invention utilizes an asymmetric magnetic field caused by a mechanism between a rotor and a stator of a motor to induce a back electromotive force signal and a sensor detection to control rotation direction.

Abstract: The invention disclosed fast start-up single-pin crystal oscillation apparatus and operation method thereof. The apparatus comprises a comparator, an envelope detector, a trigger, a crystal, a finite state machine, an amplifier gain module, a load capacitor module and a bias resistor. Compared to prior arts, the invention uses a single-pin oscillator structure to remove two external load capacitors, reduces start-up time, increase negative resistance, reduce load capacitor, and uses fast start-up algorithm to make the oscillation circuit operating at optimal power-consumption.

Abstract: An integratable capacitive touch sensing circuit through charge sharing is provided, including a charge sharing circuit, voltage-controlled oscillator, reference frequency generator, switch clock generator and frequency compare circuit; wherein charge sharing circuit further including a sensing capacitor, touch capacitor, share capacitor, charging switch, charge sharing switch and discharging switch, for sharing charge from charged sensing capacitor with discharged share capacitor through charge sharing to accumulate voltage on share capacitor. The capacitance of share capacitor is adjustable for applications generating different sensing capacitance. The charging switch, charge sharing switch and discharging switch are controlled by non-overlapping clocks. Prolonging close duration of charging switch and minimizing close duration of charge sharing switch and discharging switch can minimize interference from ambient noise.

Abstract: A differential interpolation pulse width modulation (iPWM) digital to analog converter is provided, including an iPWM module for generating differential pulses from an input digital audio data stream, a power driver for providing energy to a terminal load and a filter for removing unwanted harmonic signals to reconstruct an analog signal, wherein the iPWM module further includes a PWM pulse generator to convert the digital input numerical code to a series of time domain pulses; an interpolation unit to increase the time domain resolution of the pulses; a self-calibration unit to maintain the pulse-width accuracy of the interpolation unit; a differential pulse width generator to convert the series of time domain pulses into voltage and time domain differential form.

Abstract: An integratable capacitive touch sensing circuit through charge sharing is provided, including a charge sharing circuit, voltage-controlled oscillator, reference frequency generator, switch clock generator and frequency compare circuit; wherein charge sharing circuit further including a sensing capacitor, touch capacitor, share capacitor, charging switch, charge sharing switch and discharging switch, for sharing charge from charged sensing capacitor with discharged share capacitor through charge sharing to accumulate voltage on share capacitor. The capacitance of share capacitor is adjustable for applications generating different sensing capacitance. The charging switch, charge sharing switch and discharging switch are controlled by non-overlapping clocks. Prolonging close duration of charging switch and minimizing close duration of charge sharing switch and discharging switch can minimize interference from ambient noise.

Abstract: A differential interpolation pulse width modulation (iPWM) digital to analog converter is provided, including an iPWM for generating differential pulse from an input digital audio data stream, a power driver for providing energy to a terminal load and a filter for removing unwanted harmonic signal to reconstruct analog signal, wherein the iPWM further includes a PWM pulse generator to convert the digital input numerical code to a series of time domain pulse width; an interpolation unit to increase the time domain resolution of the pulse width; a self-calibration unit to maintain the pulse-width accuracy of the interpolation unit; a differential pulse width generator to convert series of PWM pulse into voltage and time domain differential form.

Abstract: A resume device is provided. The device detects voltage variation in standby mode. When a big voltage variation is detected, a resume process is run and a sound is played. Volume of the sound is adjustable and power is maintained within a proper range. Thus, power consumption is saved, efficiency is improved and resume process is enhanced.

Abstract: An apparatus is used to awake an electronic device to an active mode from a standby mode in case of change in the voltage of a power supply of the electronic device. The apparatus includes a power supply for supplying electricity, a switch connected to the power supply, a low-voltage reset unit connected to the switch, a micro-controller unit connected to the switch and a monitoring and awaking unit. The monitoring and awaking unit includes an actuator connected to the switch, a bias generator and the actuator through a comparator connected to the micro-processing unit. The control over the power supply by the switch causes change in the voltage of the actuator which cooperates with the bias generator and the comparator to generate an awaking signal to awake the micro-processing unit.

Abstract: A resume device is provided. The device detects voltage variation in standby mode. When a big voltage variation is detected, a resume process is run and a sound is played. Volume of the sound is adjustable and power is maintained within a proper range. Thus, power consumption is saved, efficiency is improved and resume process is enhanced.

Abstract: An apparatus is used to awake an electronic device to an active mode from a standby mode in case of change in the voltage of a power supply of the electronic device. The apparatus includes a power supply for supplying electricity, a switch connected to the power supply, a low-voltage reset unit connected to the switch, a micro-controller unit connected to the switch and a monitoring and awaking unit. The monitoring and awaking unit includes an actuator connected to the switch, a bias generator connected to the actuator and a comparator connected to the bias generator. The control over the power supply by the switch causes change in the voltage of the actuator which cooperates with the bias generator and the comparator to generate an awaking signal to awake the micro-processing unit.