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 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 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 state detection device in an audio interface includes: a first voltage detection circuit, a second voltage detection circuit and a state determination circuit. The first voltage detection circuit is coupled to a first contact and a second contact of an audio jack socket, for detecting a voltage across the first contact and the second contact to generate a first detection value. The second voltage detection circuit is coupled to a third contact of the audio jack socket, for detecting a voltage on the third contact to generate a second detection value. The state determination circuit is coupled to the first voltage detection circuit and the second voltage detection circuit, for determining a water ingress state of the audio jack socket according to the first detection value, and a connector type of an audio plug that is inserted into the audio jack socket according to the second detection value.

A device for self-adjusting an electrical threshold includes a framing unit that compares a setpoint signal representative of the supply signal to a plurality of successive intervals of reference signals that increase in value according to a geometric sequence. The framing unit generates an output based on the interval bounding the setpoint signal, wherein the output controls a switch that is configured to provide one of the plurality of reference signals as an output, wherein the output reference signal is representative of the electrical detection threshold.

A voltage monitoring device 2 includes: a comparator circuit 31; a state determination circuit 32; a pulse pattern setting circuit 33; an output circuit 36; a VDD port 21; a VSS port 22; an input port 24; and an output port 23. The comparator circuit 31 is connected to the state determination circuit 32. The state determination circuit 32 is connected to the pulse pattern setting circuit 33. The pulse pattern setting circuit is connected to the output port 23 via the output circuit 36.

A power management circuit is provided. The power management circuit includes a plurality of detectors, wherein each of the plurality of detectors are configured with a different reference threshold voltage level; and a controller coupled to the plurality of detectors and configured to activate a subset of the plurality of detectors at any given time, wherein a subset of the plurality of detectors, when activated, are configured to provide a multi-level voltage level indication on a state of a voltage supply.

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.

A system for measuring throughflow of current includes a plurality of monitoring units and an electronic device. Each of the plurality of monitoring units is positioned in a switchboard for monitoring the current flowing through the switchboard and outputting a current signal. The electronic device is electronically connected to the plurality of monitoring units. The electronic device receives the current signal transmitted by the plurality of monitoring units, performs analysis and filtering to isolate and display information as to three-phase current being consumed through the plurality of switchboards.

A system for measuring throughflow of current includes a plurality of monitoring units and an electronic device. Each of the plurality of monitoring units is positioned in a switchboard for monitoring the current flowing through the switchboard and outputting a current signal. The electronic device is electronically connected to the plurality of monitoring units. The electronic device receives the current signal transmitted by the plurality of monitoring units, performs analysis and filtering to isolate and display information as to three-phase current being consumed through the plurality of switchboards.