Semiconductor device and control system
A semiconductor device includes a sensor circuit including a sensor element, and a processing unit comprising a power management unit and an arithmetic processing circuit. The power management unit has a function of controlling power supply to the arithmetic processing circuit. The sensor circuit has a function of judging a sensed signal of the sensor element and supplying an interrupt signal to the processing unit in accordance with the judgment result. The power management unit has a function of restarting or stopping power supply to the arithmetic processing circuit in accordance with the interrupt signal.
1. A semiconductor device comprising:
a sensor circuit; and
a processing unit comprising a power management unit and an arithmetic processing circuit,
wherein the sensor circuit comprises a sensor element, a judgement circuit, and a memory,
wherein the power management unit is configured to control power supply to the arithmetic processing circuit,
wherein the arithmetic processing circuit comprises a first circuit comprising a first storage circuit and a second circuit comprising a second storage circuit,
wherein the first circuit is configured to retain first data in the first storage circuit during a period where power is supplied to the arithmetic processing circuit,
wherein the second circuit is configured to read out the first data retained in the first storage circuit and write the first data to the second storage circuit during the period where power is supplied to the arithmetic processing circuit,
wherein the second circuit is configured to retain the first data in the second storage circuit during a period where power supply to the arithmetic processing circuit is stopped,
wherein the sensor element is configured to sense a signal indicating a state of an object,
wherein the judgement circuit is configured to judge a sensed signal of the sensor element by comparing the sensed signal with reference data stored in the memory and supply an interrupt signal to the processing unit in accordance with a judgment result, and
wherein the power management unit is configured to restart power supply to the arithmetic processing circuit in accordance with the interrupt signal.
2. The semiconductor device according to claim 1 ,
wherein the second circuit is configured to read out the first data from the second storage circuit and supply the first data to the first storage circuit after power supply to the arithmetic processing circuit restarts.
3. The semiconductor device according to claim 1 , further comprising:
an antenna; and
a secondary battery,
wherein the power management unit is configured to supply power to the arithmetic processing circuit from the secondary battery, and
wherein the processing unit further comprises a communication circuit electrically connected to the antenna.
4. The semiconductor device according to claim 1 ,
wherein the sensor element is configured to measure one or more selected from force, displacement, position, speed, acceleration, angular velocity, rotational frequency, distance, light, liquid, magnetism, temperature, chemical substance, sound, time, hardness, electric field, current, voltage, electric power, radiation, flow rate, humidity, gradient, vibration, odor, and infrared rays.
5. The semiconductor device according to claim 1 ,
wherein the object is configured to be controlled in accordance with a control signal supplied from the processing unit when the judgement circuit judges that the sensor element senses an abnormal signal regarding the object.
6. A semiconductor device comprising:
a sensor circuit; and
a processing unit comprising a power management unit and an arithmetic processing circuit,
wherein the sensor circuit comprises an acceleration sensor, a judgement circuit, and a memory,
wherein the power management unit is configured to control power supply to the arithmetic processing circuit,
wherein the arithmetic processing circuit comprises a first circuit comprising a first storage circuit and a second circuit comprising a second storage circuit,
wherein the first circuit is configured to retain first data in the first storage circuit during a period where electric power is supplied to the arithmetic processing circuit,
wherein the second circuit is configured to read out the first data retained in the first storage circuit and write the first data to the second storage circuit during the period where electric power is supplied to the arithmetic processing circuit,
wherein the second circuit is configured to retain the first data in the second storage circuit during a period where power supply to the arithmetic processing circuit is stopped,
wherein the acceleration sensor is configured to sense vibration of an object,
wherein the judgement circuit is configured to judge a sensed signal of the acceleration sensor by comparing the sensed signal with reference data stored in the memory and supply an interrupt signal to the processing unit in accordance with a judgment result, and
wherein the power management unit is configured to restart power supply to the arithmetic processing circuit in accordance with the interrupt signal.
7. A control system comprising:
the semiconductor device according to claim 6 ; and
a control device,
wherein the control device is configured to control the object in accordance with a control signal supplied from the processing unit when the judgement circuit judges that the acceleration sensor senses abnormal vibration of the object.
8. The control system according to claim 7 ,
wherein the semiconductor device further comprises an antenna electrically connected to the processing unit, and
wherein the control signal is supplied from the antenna of the semiconductor device to the control device via wireless communication.
9. The control system according to claim 6 ,
wherein the semiconductor device further comprises a secondary battery, and
wherein the power management unit is configured to supply power from the secondary battery to the arithmetic processing circuit.
10. The semiconductor device according to claim 6 ,
wherein the object is configured to be controlled in accordance with a control signal supplied from the processing unit when the judgement circuit judges that the acceleration sensor senses abnormal vibration of the object.