CIRCUIT DEVICE, PHYSICAL QUANTITY DETECTION DEVICE, ELECTRONIC APPARATUS, AND MOVING OBJECT

• US 20160245651A1
• Filed: 02/16/2016
• Published: 08/25/2016
• Est. Priority Date: 02/20/2015
• Status: Active Grant

• Current Assignee: Seiko Epson Corporation (Seiko Group)
• Original Assignee: Seiko Epson Corporation (Seiko Group)
• Inventors: HANEDA, Hideo, SUDO, Yasuhiro
• Granted Patent: US 10,175,044 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: G01C 19/5614 Signal processing

Abstract

A circuit device includes a detection circuit which outputs angular velocity information, based on a detection signal from an angular velocity sensor element; and an output unit which outputs rotation number information of fixed-point notation that is obtained based on the angular velocity information. The output unit can output an integer part of the rotation number information as an integer part of the fixed-point notation, and can output a decimal part of the rotation number information as a decimal part of the fixed-point notation.

Claims

1. A circuit device comprising:

a detection circuit which outputs angular velocity information, based on a detection signal from an angular velocity sensor element; and

an output unit which outputs rotation number information of fixed-point notation that is obtained based on the angular velocity information,

wherein the output unit can output an integer part of the rotation number information as an integer part of the fixed-point notation, and can output a decimal part of the rotation number information as a decimal part of the fixed-point notation.

2. The circuit device according to claim 1,

wherein the output unit includes multiple output modes, and

wherein the multiple output modes include a first output mode in which the output unit outputs the integer part of the rotation number information and the decimal part of the rotation number information.

3. The circuit device according to claim 2, wherein the multiple output modes include a second output mode in which the output unit outputs the integer part of the rotation number information, and the output unit does not output the decimal part of the rotation number information.

4. The circuit device according to claim 2, wherein the multiple output modes include a third output mode in which the output unit does not output the integer part of the rotation number information, and the output unit outputs the decimal part of the rotation number information.

5. The circuit device according to claim 2, wherein the multiple output modes include a fourth output mode in which the number of bits of the decimal part of the rotation number information is reduced and is output by the output unit.

6. The circuit device according to claim 1,

wherein the output unit includes multiple output modes, and

wherein the multiple output modes include at least two output modes, among a first output mode in which the output unit outputs the integer part of the rotation number information and the decimal part of the rotation number information;

a second output mode in which the output unit outputs the integer part of the rotation number information, and the output unit does not output the decimal part of the rotation number information;

a third output mode in which the output unit does not output the integer part of the rotation number information, and the output unit outputs the decimal part of the rotation number information; and

a fourth output mode in which the number of bits of the decimal part of the rotation number information is reduced and is output by the output unit.

7. The circuit device according to claim 2, further comprising:

a register unit,

wherein the register unit includes a mode switching register which switches the multiple output modes.

8. The circuit device according to claim 1, further comprising:

a register unit; and

a control unit,

wherein the register unit includes an information register which stores the rotation number information, and

wherein the control unit performs processing of reading the rotation number information from the information register in accordance with a read command, and performs processing of resetting an integration processing unit of the arithmetic processing unit to an initial state in accordance with a reset command.

9. The circuit device according to claim 8, wherein the control unit performs processing of resetting the integration processing unit of the arithmetic processing unit to an initial state, if the rotation number information is read in accordance with a read command.

10. The circuit device according to claim 1, wherein, if the number of bits of the decimal part of the rotation number information is set to n bits, a value which is obtained by multiplying an integer that is represented by the n bits and 360/2ⁿ is angle information which is obtained based on the angular velocity information.

11. The circuit device according to claim 1, wherein the output unit outputs the rotation number information as serial data.

12. The circuit device according to claim 1, further comprising:

an arithmetic processing unit which performs arithmetic processing based on the angular velocity information from the detection circuit and outputs the rotation number information.

13. The circuit device according to claim 12, wherein the arithmetic processing unit performs the arithmetic processing for the angular velocity information of floating point notation, and outputs the rotation number information of fixed-point notation.

14. The circuit device according to claim 12, wherein the arithmetic processing unit performs integration processing based on the angular velocity information as the arithmetic processing, and outputs the rotation number information.

15. The circuit device according to claim 12, further comprising:

a drive circuit which drives the angular velocity sensor element,

wherein the arithmetic processing unit performs the arithmetic processing, based on the angular velocity information from the detection circuit and time interval information which is defined by a drive frequency of the drive circuit.

16. The circuit device according to claim 12, further comprising:

a drive circuit which drives the angular velocity sensor element,

wherein the arithmetic processing unit performs the arithmetic processing, using an arithmetic coefficient in which a value based on a drive frequency of the drive circuit is set.

17. The circuit device according to claim 16, wherein the arithmetic processing unit performs the arithmetic processing, using the arithmetic coefficient in which a value based on the drive frequency and setting sensitivity of the angular velocity information is set.

18. A physical quantity detection device comprising:

the circuit device according to claim 1; and

the angular velocity sensor element.

19. An electronic apparatus comprising:

the circuit device according to claim 1.

20. A moving object comprising:

the circuit device according to claim 1.