Abstract: A power management circuit includes an input, a switch circuit, a first control unit, a second control unit, and a voltage conversion circuit. The input is connected to a load and receives a first direct current (DC) voltage from an external power circuit. The switch circuit is connected between the load and a battery. The first control unit is configured to control whether the switch circuit is switched on or off, based on the first DC voltage and an output voltage of the battery. The voltage conversion circuit is configured to convert the first DC voltage into a second DC voltage and output the second DC voltage to charge the battery. The second control unit is configured to control whether the voltage conversion circuit converts the first DC voltage into the second DC voltage for charging the battery, based on the first DC voltage and the output voltage.

Abstract: An output controller and an method for outputting a signal flow to one or more earphone jacks according to a connection status of each earphone jack. The output controller includes an interface unit having more than one earphone jacks and an output control unit. The output control unit includes a signal input terminal for receiving a signal flow, a detector, and a determining module. The detector detects whether each earphone jack is connected with an earphone and outputs one or more detected signals representing the connection status of the earphone jacks. The determining module outputs the signal flow directly to the connected earphone jack if only one earphone jack is connected to the earphone or distributes the signal flow being amplified correspondingly into each connected earphone jack if more than one earphone jack is connected to the earphones.

Abstract: An over-current protection circuit for preventing a function module from over-current, the function module obtains power from a power source via an input port. The over-current protection circuit includes a path switch, a current detection circuit, a conductor switch, a first control module, and a second control module. The current detection circuit and the path switch form a loop with the input port and the function module. The current detection circuit detects a value of a current of the loop, and produces a first control signal when detecting the current of the loop is equal to or greater than a predetermined current value. The first control module turns off the conductor switch when receiving the first control signal. The second control module turns off the path switch when the conductor switch is turned off, thereby cutting off the loop.

Abstract: An embedded system includes an ARM processor and a number of b-bit peripheral processors connected to the ARM processor through a converting chip. The ARM processor includes pins P0˜Pa-1 divided into teams T1˜TN, each of which includes b pins, a and b are integral multiple of 8, wherein a=N×b. The number of the peripheral processors is N and each team corresponds to one peripheral processor. The converting chip reads an a-bit data from the ARM processor, converts the data into a plurality of b-bit data, and transfers each b-bit data to a peripheral processor, where the number of the b-bit data is N. The converting chip further reads one b-bit data from each peripheral processor in sequence, converts the read plurality of b-bit data into an a-bit data, and transfers the a-bit data to the ARM processor.

Abstract: An interface module includes an interface and a protection circuit. The interface includes a first input terminal for receiving a reference voltage representing ground (ground voltage), a second input terminal for receiving a power voltage, and a first output terminal for providing the ground voltage to a main circuit. The protection circuit includes a detection terminal for detecting the ground voltage of the first input terminal, a power input terminal for receiving the power voltage form the second input terminal, and a power output terminal for providing the power voltage to the main circuit.

Abstract: A scanning circuit includes n input ports K1˜Kn arranged in n rows L1˜Ln; and m?2 output ports W2˜(m?1) arranged in m columns P1˜Pm. The n rows and the m columns define a switch matrix including n*m switches. Ends of the switches in the same row are connected to one of the n input ports K1˜Kn, respectively. The ends of the switches in the column P1 are connected to ground. The ends of the switches in the same column of the columns P2˜P(m?1) are connected to a power supply VCC via resistors R2˜R(m?1) and the m?2 output ports W2˜W(m?1), respectively. The ends of the switches in the columns Pm are connected to ground via a resistor Rs and the power supply VCC via the resistors R2˜R(m?1) and diodes D2˜D(m?1), respectively.

Abstract: A game controller connected to a game console includes an input unit, a video access unit, a projection unit, an angle detection unit, and a processing unit. The input unit generates control signals according to user input for controlling games. The video access unit receives video signals from the game console. The projection unit includes a lens module to projects game images onto a projection surface and a driving module to adjust the projection direction of the lens module. The angle detection unit detects a tilt angle of the game controller. The processing unit controls game play according to the control signals and generates an adjusting signal including a change of the tilt angle. The adjusting signal is sent to the driving module to adjust the projection direction of the lens module.

Abstract: A scanning circuit includes n rows L1˜Ln, 2n columns P1-1˜P1-n and P2-1˜P2-n, and the n rows L1˜Ln and the n columns P1-1˜P1-n cooperatively form a switch matrix comprising n*n switches S1-1˜Sn-n, with ends of the switches in the same row electrically connected to one of n I/O ports K1˜Kn, respectively, the ends of the switches in the same column are electrically connected to ground via one resistor R1-1˜R1-n, respectively, each of resistors R2-1˜R2-n is electronically connected in one column of the columns P2-1˜P2-n, and connected between one of the I/O ports K1˜Kn and ground via one of the resistors R1-1˜R1-n, respectively. A keyboard and a scanning method are also provided.

Abstract: The present disclosure provides an audio signal amplifying circuit for an electronic device including a processing chip and a speaker. The audio signal amplifying circuit includes an amplifying circuit and an inverting circuit connected to the processing chip to get a first control signal and invert the first control signal to generate a second control signal. The first control signal and/or the second control signal are used to control the operation mode of the amplifying circuit to be in an amplifying mode or in a non-amplifying mode.

Abstract: The disclosure provides an electronic device and a detecting position method adapted for the electronic device. The device stores an infrared sensing mode and a capture mode. The method includes steps of: entering the infrared sensing mode in response to an input signal and capturing infrared signals from an external environment, amplifying the infrared signals and converting the infrared signals into digital signals, evaluating whether part of the infrared signals falls into a predetermined waveband, if yes, focusing on an infrared thermal source whose infrared signals fall into the predetermined waveband, switching from the infrared sensing mode to the capture mode, taking a photo of the infrared thermal source, and processing the photo to identify a position of the infrared thermal source in the photo and displaying the position of the infrared thermal source in the photo.

Abstract: The disclosure provides an emergency message transmission method and an electronic device implementing the method. The electronic device stores a reference voltage value and comprises a smoke assessing unit. The method includes steps: capturing air composition around the electronic device, assessing whether the air composition has changed, if the air composition has changed, detecting an electrical current of the smoke assessing unit, amplifying the electrical current and converting the amplified current to a voltage value, comparing the converted voltage value with the reference voltage value, judging whether the converted voltage value reaches the reference voltage value, and if the converted voltage value reaches the reference voltage value, outputting a signal including an emergency message.

Abstract: A light control signal generating circuit includes a photosensitive element, two transistors, and four resistances. A first resistance and the photosensitive element are connected in series between a power voltage terminal and a ground terminal. A base electrode of a first transistor is connected to a node between the first resistance and the photosensitive element, a collecting electrode is connected to the power voltage terminal through a second resistance, and an emitting electrode is connected to the ground terminal through a third resistance. A base electrode of a second transistor is connected to a node between the second resistance and the first transistor, a collecting electrode is connected to the power voltage terminal through a fourth resistance, and an emitting electrode is connected to the ground terminal through the third resistance. An output terminal is formed from a node between the fourth resistance and the second transistor.

Abstract: An electronic baby monitoring device includes a sensor monitor and a motion sensor. The motion sensor communicates with the sensor monitor and includes an accelerometer, a control module, an emitting module, a power source, and a switch. The accelerometer senses the acceleration value of the motion sensor. When the control module determines that at least two acceleration values sensed continuously by the accelerometer respectively reach or exceed a predetermined value, the control module turns on the switch to control the power source to provide power to the emitting module, generates control signals, and controls the emitting module to emit the control signals to the sensor monitor to direct the sensor monitor to take action.

Abstract: A display apparatus and a method for locking and unlocking a touch-sensitive screen are provided. A user interface is provided on the display apparatus for a user to set at least two types of passwords. At least two types of passwords displayed on the user interface are stored when input of the at least two types of passwords ends. The touch-sensitive screen is locked according to any one of the at least two stored types of passwords. The touch-sensitive screen is unlocked if an input password matches any one of the at least two types of passwords.

Abstract: A scanning circuit includes n input ports K1˜Kn arranged in n rows L1˜Ln; and m?2 output ports W2˜(m?1) arranged in m columns P1˜Pm. The n rows and the m columns define a switch matrix including n*m switches. Ends of the switches in the same row are connected to one of the n input ports K1˜Kn, respectively. The ends of the switches in the column P1 are connected to ground. The ends of the switches in the same column of the columns P2˜P(m?1) are connected to a power supply VCC via resistors R2˜R(m?1) and the m?2 output ports W2˜W(m?1), respectively. The ends of the switches in the columns Pm are connected to ground via a resistor Rs and the power supply VCC via the resistors R2˜R(m?1) and diodes D2˜D(m?1), respectively.

Abstract: A scanning circuit includes n rows L1˜Ln, 2n columns P1-1˜P1-n and P2-1˜P2-n, and the n rows L1˜Ln and the n columns P1-1˜P1-n cooperatively form a switch matrix comprising n*n switches S1-1˜Sn-n, with ends of the switches in the same row electrically connected to one of n I/O ports K1˜Kn, respectively, the ends of the switches in the same column are electrically connected to ground via one resistor R1-1˜R1-n, respectively, each of resistors R2-1˜R2-n is electronically connected in one column of the columns P2-1˜P2-n, and connected between one of the I/O ports K1˜Kn and ground via one of the resistors R1-1˜R1-n, respectively. A keyboard and a scanning method are also provided.

Abstract: An audio input unit, includes an audio capturing unit, a first coupling circuit, a signal filtering circuit, a second coupling circuit, a converting circuit and a codec which are connected in series in that order. The first coupling circuit is used for filtering the direct-current signal, the signal filtering circuit is used for filtering noise from the electrical signal, and the second coupling circuit is used for further filtering the direct-current signal. The converting circuit includes an input port, a first output port and a second output port, when the input port receives the filtered signal, the first output port outputs a signal with the same phase as the filtered signal, the second output port outputs a signal with the reverse phase as the filtered signal, the two output signals have the opposite phase and the same amplitude.

Abstract: An electrical soldering iron is provided. The soldering iron comprises a heating element, a constant temperature heating circuit, a motion sensor, and a processor. The constant temperature heating circuit is configured for heating the heating element. The motion sensor is configured for detecting motion of the electrical soldering iron. The processor is configured for determining motion state of the electrical soldering iron according to signals from the motion sensor and directing the constant temperature heating circuit to bring the heating element to a temperature of a predetermined value corresponding to the motion state.