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US 2009/0021176 A1Published application
Semiconductor device
AssigneeRohm Co., Ltd.
InventorYoshinori IMANAKA
Life of this patent
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Abstract
A control terminal is connected to an external resistor, and is connected to a time constant capacitor. A control unit compares a control voltage with a threshold voltage, and switches the function of a semiconductor device according to the comparison results. A charge/discharge circuit charges or discharges the time constant capacitor connected to the control terminal. The semiconductor device uses the voltage at the control terminal, which changes according to the charging operation or the discharging operation performed by the charge/discharge circuit, as a time constant voltage.
Claims6
A semiconductor device comprising:
- a control terminal which is connected to one terminal of an external resistor, the other terminal of which is connected to a fixed voltage terminal, and which is connected to a time constant capacitor;
- a control unit which compares the voltage at the control terminal with a predetermined threshold voltage, and which switches the function of the semiconductor device according to the comparison results;
- and
- a charge/discharge circuit which charges or discharges the time constant capacitor connected to the control terminal,
- wherein the voltage at the control terminal, which changes according to the charging operation or discharging operation performed by the charge/discharge circuit, is used as a time constant voltage.
2 more elements
Dependencies are inferred from the claim text.