A semiconductor device is provided and includes: a voltage sensing circuit configured to output first and second sensing voltages based on a target voltage applied thereto; and a comparing circuit configured to generate a monitoring output signal based on levels of the first and second sensing voltages, wherein the voltage sensing circuit includes: a first transistor including a gate to receive a reference bias voltage, a source connected to an input node, and a drain connected to one end of a first resistive element; a second transistor provided in a current mirror structure with the first transistor, and including a drain connected to a third resistive element; and a second resistive element connected to another end of the first resistive element, the first sensing voltage being provided to both ends of the second resistive element, and the second sensing voltage being provided to both ends of the third resistive element.

A battery device includes a storage battery unit, a current sensing unit, a temperature sensing unit, a storage unit and a processing unit. The current sensing unit detects load current. The temperature sensing unit detects the battery temperature of the storage battery unit. The storage unit stores a cycle number, multiple threshold intervals, and multiple charging voltage values. According to the load current, the battery temperature and the cycle number, the depth of discharge of the storage battery is acquired. The storage unit stores the load current, the battery temperature and the cycle number. The processing unit operates a charging procedure. The charging voltage value corresponding to the working threshold interval is selected to be the main charging voltage value, and the DC voltage that is identical to the main charging voltage value is used to perform a constant voltage charge for the battery unit.

The circuitry is configured to determine whether an appurtenance device is an authorized or an unauthorized product, based on a comparison result between a measured current value pattern produced for a predetermined period and a reference current value pattern obtained in advance for the predetermined period.

A semiconductor apparatus includes a control circuit and a level shifter. The control circuit is configured to output a power control signal for activating a data input/output circuit operated by a first voltage when the first voltage is higher than a first set voltage and a second voltage is higher a second set voltage. The level shifter configured to receive the power control signal and lower operating voltages of devices including a plurality of transistors with a thin gate insulating layer based on the power control signal.

A voltage testing system. The voltage testing system includes a pair of probes, each having a housing with a first end and a second end, wherein the pair of probes are electrically connected by a wire affixed to the first end of each of the pair of probes. A prong extends from the second end of the pair of probes, wherein a pin extends therethrough. The pin is electrically conductive, such that the pin is in communication with a fuse and a plurality of lights within the housing. The pin can be spring-biased such that a connection is formed between the fuse and the pin when the force is applied to the pin. The fuse can sever the electrical connection when a set current is transmitted through the fuse, such that a user is protected from excessive currents. The plurality of lights illuminate in response to receiving a preset voltage.

A method includes selecting at least one first voltage that defines subsets of DC voltages from among an ordered set of DC voltages, comparing the first voltage with a DC reference voltage, selecting one of the subsets based on a result of the comparing, and comparing each voltage of the selected subset with the reference voltage.

A semiconductor apparatus includes a data input and output (input/output) circuit configured to operate by receiving a first voltage, a core circuit configured operate by receiving a second voltage, and a control circuit configured to output a power control signal for activating the data input/output circuit when the first voltage is higher than a first set voltage and the second voltage is higher a second set voltage.

A power indication circuit for indicating different power levels of a battery, can include: N LED indicators; N setting resistors; N multifunction ports; a drive circuit coupled to the N multifunction ports and the battery, and being configured to acquire N threshold voltage signals in accordance with voltages at the N multifunction ports during a first time period of an operation cycle, and to generate N comparison signals in accordance with the N threshold voltage signals and a voltage detection signal generated by detecting a voltage of the battery, in order to drive the N LED indicators in accordance with the N comparison signals during a second time period of the operation cycle; and where each of the N setting resistors coupled in parallel to a corresponding one of the N LED indicators is respectively coupled to a corresponding one of the N multifunction ports.

A method and apparatus is described in which a signal indicative of an operation of a energy source of a 3D printer during a second predetermined time period commencing with the end of a first predetermined time period is obtained, the first predetermined time period commencing with an activation of the energy source, wherein the energy source is active throughout the first and second time periods; the obtained signal is compared with a reference signal; and it is determined, based on the comparison, whether the energy source is operating according to predetermined characteristics.

A semiconductor device is provided which can detect a fluctuation of a power supply voltage. The semiconductor device includes a counter circuit that outputs a signal when a period during which a power supply voltage of a system to be monitored is lower than or equal to a first voltage value exceeds a predetermined time, a first flag circuit that sets a first flag based on the signal, a second flag circuit that sets a second flag when the power supply voltage becomes a second voltage value or lower, and a circuit that outputs a reset signal that resets the system when both the first and the second flags are set. The first voltage value and the second voltage value are higher than a minimum voltage that guarantees normal operation of the system. The first voltage value is higher than the second voltage value.