IC FOR SENSOR, SENSOR DEVICE, AND ELECTRONIC APPARATUS

• US 20150128699A1
• Filed: 11/11/2014
• Published: 05/14/2015
• Est. Priority Date: 11/12/2013
• Status: Active Grant

• Current Assignee: Seiko Epson Corporation (Seiko Group)
• Original Assignee: Seiko Epson Corporation (Seiko Group)
• Inventors: MAKI, Katsuhiko, NAKAJIMA, Katsuhito
• Granted Patent: US 9,644,964 B2
• Time in Patent Office: Days
• US Class Current: 73/504.02
• CPC Class Codes: G01C 19/00 Gyroscopes; Turn-sensitive devices using vibrating masses; Turn-sensitive devices without moving masses; Measuring angular rate using gyroscopic effects
• CPC Class Codes: G01C 19/5776 Signal processing not specific to any of the devices covered by groups G01C19/5607 - G01C19/5719

Abstract

A IC for sensor includes a detector which detects an angular velocity signal based on a signal from a sensor element, an AD converter which converts an analog signal from the detector into a digital signal, and a DC component detector which detects a DC component from the digital signal output from the AD converter within a predetermined period of time.

Claims

1. A IC for sensor comprising:

a detector which detects an angular velocity signal based on a signal from a sensor element;

an AD converter which converts an analog signal from the detector into a digital signal; and

a DC component detector which detects a DC component from the digital signal output from the AD converter within a predetermined period of time.

2. The IC for sensor according to claim 1, further comprising:

a corrector which corrects the digital signal based on the DC component.

3. The IC for sensor according to claim 2,

wherein the DC component detector includes a low pass filter circuit which switches a low pass cutoff frequency from a first frequency to a second frequency lower than the first frequency.

4. The IC for sensor according to claim 3,

wherein the DC component detector includes a gain corrector which corrects a gain for each switch of the cutoff frequency.

5. The IC for sensor according to claim 1, further comprising:

a pre-digital corrector which corrects an offset of the digital signal based on a set value between the AD converter and the DC component detector.

6. The IC for sensor according to claim 1,

wherein the detection operation in the DC component detector is started based on a signal input from outside.

7. The IC for sensor according to claim 2,

wherein a flag indicating the completion of the operation of detecting the DC component in the DC component detector is set, and the correction in the corrector can be performed after the setting of the flag.

8. A sensor device comprising:

a sensor element; and

the IC for sensor according to claim 1.

9. A sensor device comprising:

a sensor element; and

the IC for sensor according to claim 2.

10. A sensor device comprising:

a sensor element; and

the IC for sensor according to claim 3.

11. A sensor device comprising:

a sensor element; and

the IC for sensor according to claim 4.

12. A sensor device comprising:

a sensor element; and

the IC for sensor according to claim 5.

13. A sensor device comprising:

a sensor element; and

the IC for sensor according to claim 6.

14. A sensor device comprising:

a sensor element; and

the IC for sensor according to claim 7.

15. An electronic apparatus comprising:

a sensor element; and

the IC for sensor according to claim 1.

16. An electronic apparatus comprising:

a sensor element; and

the IC for sensor according to claim 2.

17. An electronic apparatus comprising:

a sensor element; and

the IC for sensor according to claim 3.

18. An electronic apparatus comprising:

a sensor element; and

the IC for sensor according to claim 4.

19. An electronic apparatus comprising:

a sensor element; and

the IC for sensor according to claim 5.

20. An electronic apparatus comprising:

a sensor element; and

the IC for sensor according to claim 6.