Semiconductor integrated circuit
View Patent ↗Electronic apparatus that can suppress the operating voltage of an incorporated semiconductor integrated circuit to a low voltage is provided. Electronic apparatus 1 includes a power supply circuit 13 , a semiconductor integrated circuit 10 that operates by a supply voltage supplied from the power supply circuit 13 , and a temperature sensor 11 that measures the temperature of the semiconductor integrated circuit 10 . The power supply circuit 13 decreases the supply voltage according to a rise in the measured temperature.
1. Electronic apparatus comprising:
a power supply circuit;
a semiconductor integrated circuit that operates by a supply voltage supplied from the power supply circuit; and
a temperature sensor that measures temperature of the semiconductor integrated circuit,
wherein the power supply circuit decreases the supply voltage according to a rise in the measured temperature while maintaining the operating frequency unchanged in accordance with a timing profile whereby: (i) the power supply circuit decreases the supply voltage substantially immediately upon detecting that the measured temperature has become equal to or higher than a predetermined temperature threshold, when a processing burden on the semiconductor integrated circuit is equal to or higher than a predetermined processing threshold, and (ii) the power supply circuit decreases the supply voltage upon detecting that the measured temperature has become equal to or higher than the predetermined temperature threshold and after a timing delay has passed, when the processing burden on the semiconductor integrated circuit is below the predetermined processing threshold.
2. A control method of electronic apparatus including
a power supply circuit,
a semiconductor integrated circuit that operates by a supply voltage supplied from the power supply circuit, and
a temperature sensor that measures temperature of the semiconductor integrated circuit, the control method comprising:
a step of acquiring the measured temperature; and
a step of decreasing the supply voltage supplied to the semiconductor integrated circuit by the power supply circuit according to a rise in the acquired temperature while maintaining the operating frequency unchanged in accordance with a timing profile whereby: (i) the power supply circuit decreases the supply voltage substantially immediately upon detecting that the measured temperature has become equal to or higher than a predetermined temperature threshold, when a processing burden on the semiconductor integrated circuit is equal to or higher than a predetermined processing threshold, and (ii) the power supply circuit decreases the supply voltage upon detecting that the measured temperature has become equal to or higher than the predetermined temperature threshold and after a timing delay has passed, when the processing burden on the semiconductor integrated circuit is below the predetermined processing threshold.
3. A semiconductor integrated circuit that operates by a supply voltage supplied from a power supply circuit, the semiconductor integrated circuit, comprising:
a temperature sensor that measures temperature of the semiconductor integrated circuit; and
a request section that requests the power supply circuit to decrease the supply voltage according to a rise in the measured temperature while maintaining the operating frequency unchanged in accordance with a timing profile whereby: (i) the power supply circuit decreases the supply voltage substantially immediately upon detecting that the measured temperature has become equal to or higher than a predetermined temperature threshold, when a processing burden on the semiconductor integrated circuit is equal to or higher than a predetermined processing threshold, and (ii) the power supply circuit decreases the supply voltage upon detecting that the measured temperature has become equal to or higher than the predetermined temperature threshold and after a timing delay has passed, when the processing burden on the semiconductor integrated circuit is below the predetermined processing threshold.