Nuvoton Technology Corporation

Chih-Ping Lu

Cheng-Chih Wang

Yung-Chi Lan

Chun-Chi Chen

Tzu-Lan Shen

A comparator testing circuit and a testing method are provided. The comparator testing circuit includes a switching circuit, a comparator, and a determination circuit. The switching circuit receives a first signal, a second signal, and a switching signal, and outputs one of the first signal and the second signal as a first input signal and the other of the first signal and the second signal as a second input signal according to the switching signal. The comparator compares the first input signal with the second input signal to generate an output signal. The determination circuit determines whether the comparator is abnormal based on the switching signal and the output signal to generate an exception flag.

Comparator testing circuit and testing method thereof

A waveform generator is provided. The waveform generator includes a timer and a digital to analog converter (DAC). The timer periodically provides a trigger signal according to a fixed time period. In response to the trigger signal, the DAC is configured to convert first digital data into output voltage of an analog signal. A data hold register is configured to store second digital data that corresponds to the previous output voltage of the analog signal. A judgment circuit is configured to provide a first control signal according to the second digital data, and the first control signal indicates that the previous output voltage is within a first voltage range. A calculation circuit is configured to obtain the first digital data according to the second control signal, the second digital data, and a voltage variation that corresponds to the first voltage range and to update the second digital data.

Waveform generator and waveform generating method

A control device for adjusting the output voltage of a voltage generator, wherein the control device includes a master circuit, a slave circuit, and a power-scaling control circuit, is provided. The master circuit is coupled to a system bus. The slave circuit is coupled to the system bus. The power-scaling control circuit is coupled between the master circuit and the slave circuit. In response to the master circuit sending a voltage-scaling command, the power-scaling control circuit sets a control signal at a suspension level so that the slave circuit sets a specific signal transmitted by the system bus at a wait level. In response to the specific signal being at the wait level, the master circuit stops accessing the first specific device of the slave circuit. In response to the control signal being at the suspension level, the power-scaling control circuit adjusts the output voltage.

Control device and adjustment method

A control device is used to adjust an output voltage of a voltage generator, and includes a master circuit, a slave circuit, and a power-scaling control circuit. The master circuit is coupled to a first bus. The slave circuit is coupled to a second bus. In a normal mode, the first and second buses are connected to each other via the power-scaling control circuit, the master circuit accesses the slave circuit via the first and second buses. In an adjustment mode, the power-scaling control circuit controls the master circuit to stop accessing the slave circuit, and the power-scaling control circuit adjusts the output voltage. When the master circuit sends a trigger signal, the power-scaling control circuit enters the adjustment mode. When the master circuit does not send the trigger signal, the power-scaling control circuit enters the normal mode.

A driving protection circuit is coupled to a load via an input/output pin. A signal generator circuit is configured to generate a driving signal. An input/output circuit transmits the driving signal to the input/output pin according to an enable signal. A counter circuit adjusts the count value when the enable signal is at a predetermined level. A detection circuit detects the voltage level of the input/output pin to generate a detection signal. When the count value is equal to a predetermined value, a control circuit determines whether the level of the detection signal is the same as the level of the driving signal. When the level of the detection signal is not the same as the level of the driving signal, the control circuit sends an error signal to turn off power to the load.

Driving protection circuit, operating circuit and control method

An authentication system and method for an electronic governor of an unmanned aerial vehicle is disclosed. By employing reciprocative authentication and encryption mechanisms between a main control terminal and an electronic governor, the use of a modified electronic governor is prevented and thus the illegal use of UAVs is also prevented. Moreover, the provided electronic governor may be operated in dual-mode to extend its compatibility to conventional main control terminals.

Authentication system and method for electronic governor of unmanned aerial vehicle

A sensing device includes a comparator, a first and a second variable capacitor unit. A first comparator input of the comparator is electrically coupled to a touch pad. The first variable capacitor unit is configured to charge the first comparator input such that the first comparator input has a first potential. The second variable capacitor unit is configured to charge a second comparator input of the comparator such that the second comparator input has a second potential. The comparator is configured for comparing the first potential and the second potential to generate a comparator output signal. In a condition of the touch pad being operated, the first variable capacitor unit is adjusted according to the comparator output signal to perform potential compensation for the first comparator input, or the second variable capacitor unit is adjusted according to the comparator output signal to perform potential compensation for the second comparator input.

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Hsinchu, Taiwan

Chih-Ping Lu