Sensor control circuit
View Patent ↗A sensor control circuit includes an acceleration sensor which detects acceleration and generates a detection signal. The sensor control circuit also includes a processing section which generates a calculation result by calculating the acceleration in accordance with the detection signal, and generates an interrupt notification. The sensor control circuit also includes an interrupt output circuit. The interrupt output circuit has a threshold value determination section which generates a detection result by determining a change condition. The change condition is determined by comparing the calculation result with the threshold value. The interrupt output circuit also has a plurality of INT terminals and a selection section. The selection section selects the detection result or the interruption notification in accordance with mode information which is set from a host CPU and sends the selected signal from the INT terminal through the associated INT terminal.
1. A sensor control circuit comprising:
a sensor which detects change in a physical quantity and generates a detection signal;
a processing section which calculates the change in the physical quantity based on the detection signal and generates a calculation result and an interrupt notification; and
an interrupt output circuit which includes a threshold value determination section and a plurality of interrupt terminals, wherein the threshold value determination section generates a detection result by comparing the calculation result with a threshold value and determining a change condition of the physical quantity, and the interrupt output circuit separately supplies the detection result and/or the interrupt notification from the plurality of interrupt terminals, respectively, to an external interrupt processing section, in accordance with mode information given from the external interrupt processing section.
2. The sensor control circuit according to claim 1 , wherein the plurality of interrupt terminals are first and second terminals, the external interrupt processing section gives first or second mode information, the interrupt output circuit which includes a selection section which selects the detection result or the interrupt notification, based on the first or second mode information given from the external interrupt processing section, the interrupt output circuit supplies the selected detection result or interrupt notification from the first or second interrupt terminal to the external interrupt processing section, the first interrupt terminal is used when the first mode information is given, and the second interrupt terminal is used when the second mode information is given.
3. The sensor control circuit according to claim 1 , wherein the sensor is an acceleration sensor which detects acceleration and the detection signal is an acceleration detection signal.
4. The sensor control circuit according to claim 1 , wherein the sensor control circuit is constituted by a single-chip integrated circuit.
5. The sensor control circuit according to claim 1 , wherein the external interrupt processing section is included in a portable equipment.
6. The sensor control circuit according to claim 1 , wherein the sensor is a temperature sensor and the detection signal is a temperature detection signal.
7. A sensor control circuit comprising:
a sensor which detects change in a physical quantity and generates a detection signal;
a processing section which calculates the change in the physical quantity based on the detection signal and generates a calculation result and an interrupt notification; and
an interrupt output circuit which includes a threshold value determination section and a plurality of interrupt terminals, wherein the threshold value determination section determines a change condition of the physical quantity by comparing the calculation result with a threshold value and generates a detection result, the interrupt output circuit supplies the detection result and/or the interrupt notification to an external interrupt processing section through a desired one of the plurality of interrupt terminals in accordance with mode information given from the external interrupt processing section.
8. The sensor control circuit according to claim 7 , wherein the interrupt output circuit further includes a selection section which selects the detection result or the interrupt notification based on the mode information given from the external interrupt processing section, and sends the selected detection result or interrupt notification from the desired one of the plurality of interrupt terminals to the external interrupt processing section.
9. The sensor control circuit according to claim 7 , wherein the sensor is an acceleration sensor which detects acceleration and the detection signal is an acceleration detection signal.
10. The sensor control circuit according to claim 7 , wherein the sensor control circuit is constituted by a single-chip integrated circuit.
11. The sensor control circuit according to claim 7 , wherein the external interrupt processing section is included in a portable equipment.
12. The sensor control circuit according to claim 7 , wherein the sensor is a temperature sensor and the detection signal is a temperature detection signal.