Abstract: An electrocardiogram measurement unit comprises: a pair of positive and negative electrode bodies and constituting capacitive coupling electrodes and arranged in a non-contact state with a human body; a signal amplification unit that amplifies an electric signal from both the electrode bodies and outputs the amplified electric signal as an electrocardiographic signal; and an inverting output unit that inverts an in-phase signal of the electric signal from both the electrode bodies and outputs an inverted signal. The electrocardiographic signal measurement device comprises simultaneously both channels and when the electrocardiogram measurement unit to which the inverted signal from the inverting output unit is input to the positive electrode body is defined as a first channel, and the electrocardiogram measurement unit to which the inverted signal from the inverting output unit is input to the negative electrode body is defined as a second channel.

Abstract: The present disclosure provides a voltage comparator circuit, a power management circuit and an electronic device. The voltage comparator circuit compares a voltage difference between a positive electrode input terminal and a negative electrode input terminal with a threshold voltage. An amplifier circuit includes a first input node and a second input node, and amplifies a voltage difference between the first input node and the second input node. The input switch circuit, in a first phase, applies a predetermined voltage of one of the positive electrode input terminal and the negative electrode input terminal to the first input node and the second input node of the amplifier circuit; and in a second phase, applies a voltage of the positive electrode input terminal to the first input node of the amplifier circuit, and applies a voltage of the negative electrode input terminal to the second input node.

Abstract: The present disclosure provides a voltage comparator circuit, a power management circuit and an electronic device. The voltage comparator circuit compares a voltage difference between a positive electrode input terminal and a negative electrode input terminal with a threshold voltage. An amplifier circuit includes a first input node and a second input node, and amplifies a voltage difference between the first input node and the second input node. The input switch circuit, in a first phase, applies a predetermined voltage of one of the positive electrode input terminal and the negative electrode input terminal to the first input node and the second input node of the amplifier circuit; and in a second phase, applies a voltage of the positive electrode input terminal to the first input node of the amplifier circuit, and applies a voltage of the negative electrode input terminal to the second input node.

Abstract: A battery fuel gauge circuit is coupled to a rechargeable battery. A first A/D converter samples a voltage VBAT of the battery. A logic circuit receives the output of the first A/D converter. The logic circuit acquires the output of the first A/D converter when an electronic device mounting the battery fuel gauge circuit is turned on for the first time.

Abstract: A battery fuel gauge circuit is coupled to a rechargeable battery. A first A/D converter samples a voltage VBAT of the battery. A logic circuit receives the output of the first A/D converter. The logic circuit acquires the output of the first A/D converter when an electronic device mounting the battery fuel gauge circuit is turned on for the first time.

Abstract: Charging circuit includes: DC input terminal; battery terminal; system terminal; first transistor; second transistor; gate controller for controlling turning on/off of first transistor; charging controller for controlling gate voltage of second transistor to control charging of secondary battery; overcurrent protection circuit for comparing an input current flowing in DC input terminal and first transistor with threshold current having multiple steps of values, and vary gate voltage such that on-resistance is increased when input current reaches threshold current; low-voltage detection circuit for comparing voltage at DC input terminal with predetermined threshold voltage, and decrease threshold current of overcurrent protection circuit by one step when voltage of DC input terminal is below predetermined threshold voltage; and DC power detecting unit for determining, when threshold current is at minimum value and voltage of DC input terminal is below threshold voltage, that DC power source is not connected to

Abstract: A power management circuit that controls a plurality of power circuits for generating supply voltages at least for a processor is disclosed. The circuit includes: a real time clock that generates clock signals with a predetermined frequency; a power-on terminal to which a power-on key is connected, wherein the power-on terminal receives a voltage whose level depends on whether the power-on key is pressed or not; a power-on detecting unit that monitors a voltage at the power-on terminal and asserts a start signal if it is determined using the clock signals that the power-on key is pressed and held for a predetermined time period; and a power management controller that receives a system voltage based on a battery voltage or a DC voltage from a DC power source and, upon the start signal is asserted, starts up the plurality of power circuits in a predetermined sequence using the clock signals.

Abstract: A power management circuit that controls a plurality of power circuits for generating supply voltages at least for a processor is disclosed. The circuit includes: a real time clock that generates clock signals with a predetermined frequency; a power-on terminal to which a power-on key is connected, wherein the power-on terminal receives a voltage whose level depends on whether the power-on key is pressed or not; a power-on detecting unit that monitors a voltage at the power-on terminal and asserts a start signal if it is determined using the clock signals that the power-on key is pressed and held for a predetermined time period; and a power management controller that receives a system voltage based on a battery voltage or a DC voltage from a DC power source and, upon the start signal is asserted, starts up the plurality of power circuits in a predetermined sequence using the clock signals.

Abstract: Charging circuit includes: DC input terminal; battery terminal; system terminal; first transistor; second transistor; gate controller for controlling turning on/off of first transistor; charging controller for controlling gate voltage of second transistor to control charging of secondary battery; overcurrent protection circuit for comparing an input current flowing in DC input terminal and first transistor with threshold current having multiple steps of values, and vary gate voltage such that on-resistance is increased when input current reaches threshold current; low-voltage detection circuit for comparing voltage at DC input terminal with predetermined threshold voltage, and decrease threshold current of overcurrent protection circuit by one step when voltage of DC input terminal is below predetermined threshold voltage; and DC power detecting unit for determining, when threshold current is at minimum value and voltage of DC input terminal is below threshold voltage, that DC power source is not connected to

Abstract: A water purifier apparatus for removing the bleaching agent, the smell of an adhesive used in joining water pipes, and other impurities from water supplied through a water supply system. The water purifier apparatus includes a body having a raw water outlet, a cartridge disposed in the body and housing a filter material, the cartridge having a raw water inlet and a purified water outlet with an enclosed water passage extending therebetween, the raw water outlet and the raw water inlet being coupled to each other in a watertight manner. The cartridge is subject to repeated stresses due to application of water pressure, which varies as the flow of water is turned on and off and since the cartridge that is replaced in a relatively short period of time, the cartridge may be of a relatively small mechanical strength. The cartridge is fixedly positioned in the body by a cover, which is prevented from becoming broken or damaged by varying stresses since these stresses are borne instead by the cartridge.