Semiconductor device including fault detector, and display device
AssigneeRohm Co., Ltd.
InventorYasuhito Sugimoto
Life of this patent
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Abstract
A semiconductor device equipped with: a power supply circuit that contains multiple power supply blocks mutually having input/output relationships; a power supply control unit that outputs control signals to each of the power supply blocks indicating On/Off; a fault detection unit; and a sequencer. When the fault detection unit detects that any of the control signals indicates Off during startup of the power supply circuit, the sequencer moves to a prescribed shutdown sequence mode, and the power supply control unit performs a shutdown sequence in which the control signals are output so as to turn off the power supply blocks in a prescribed order.
Claims7
A semiconductor device, comprising:
- a power circuit including a plurality of power blocks having an input-output interrelationship with each other;
- a power controller outputting control signals indicating on or off to the plurality of power blocks respectively;
- a fault detector that includes an AND circuit to which the control signals are input, the fault detector further including a digital filter provided in a stage succeeding the AND circuit;
- and
- a sequencer,
- wherein when, during startup of the power circuit, the fault detector detects at least one of the control signals indicating off, the sequencer shifts to a predetermined shutdown sequence state and the power controller outputs the control signals so as to turn off the power blocks in a predetermined order.
A semiconductor device, comprising:
- a power circuit including a plurality of power blocks having an input-output interrelationship with each other;
- a power controller outputting control signals indicating on or off to the plurality of power blocks respectively;
- a fault detector;
- a sequencer;
- and
- a driver driving a display panel, wherein output voltages of the power blocks are fed to the driver,
- wherein:
- when, during startup of the power circuit, the fault detector detects at least one of the control signals indicating off, the sequencer shifts to a predetermined shutdown sequence state and the power controller outputs the control signals so as to turn off the power blocks in a predetermined order,
- the sequencer, in a state where the display panel is in a display-off state, shifts to the shutdown sequence based on a sleep-in command, and
- when a fault is detected by the fault detector, regardless of the sleep-in command, the sequencer forcibly shifts to the shutdown sequence.
Dependencies are inferred from the claim text.