SEMICONDUCTOR DEVICE, CORRECTION METHOD IN SEMICONDUCTOR DEVICE, AND CORRECTION METHOD OF CAMERA MODULE

• US 20160248977A1
• Filed: 12/11/2015
• Published: 08/25/2016
• Est. Priority Date: 02/19/2015
• Status: Active Grant

• Current Assignee: Renesas Electronics Corporation
• Original Assignee: Renesas Electronics Corporation
• Inventors: KITANO, Toru
• Granted Patent: US 9,794,484 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: H04N 23/6812 based on additional sensors, e.g. acceleration sensors

Abstract

An object of the present invention is to provide a semiconductor device that can suppress the cost of a camera module from increasing.

Provided is a semiconductor device which is coupled to a device that outputs positional information representing a position and includes a first external terminal to which the positional information is supplied, and a second external terminal. Sensitivity deviation information representing the deviation of the sensitivity of the device is received through the second external terminal, and a gain to amplify the positional information from the first external terminal is set on the basis of the sensitivity deviation information. Further, the first external terminal and the second external terminal are the same external terminals, and the positional information and the sensitivity deviation information are supplied in a time-division manner.

Claims

1. A semiconductor device coupled to a device that outputs positional information representing a position, the semiconductor device comprising:

a first external terminal to which the positional information is supplied; and

a second external terminal,

wherein sensitivity deviation information representing the deviation of the sensitivity of the device is received through the second external terminal, and a gain to amplify the positional information from the first external terminal is set on the basis of the sensitivity deviation information.

2. The semiconductor device according to claim 1,

wherein the first external terminal and the second external terminal are the same external terminals, and the positional information and the sensitivity deviation information are supplied in a time-division manner.

3. The semiconductor device according to claim 2,

wherein the device outputs a deviation between the sensitivity of the device and a predetermined sensitivity as the sensitivity deviation information, and

wherein the semiconductor device includes a gain control amplifier that amplifies the positional information, and the gain of the gain control amplifier is set on the basis of a value obtained by an operation between a parameter associated with the predetermined sensitivity and the sensitivity deviation information.

4. The semiconductor device according to claim 3,

wherein the semiconductor device includes a total parameter holding circuit that holds the value obtained by the operation between the parameter associated with the predetermined sensitivity and the sensitivity deviation information.

5. The semiconductor device according to claim 2,

wherein the device outputs a deviation between the sensitivity of the device and a predetermined sensitivity as the sensitivity deviation information, and

wherein the semiconductor device includes a first gain control amplifier and a second gain control amplifier that amplify the positional information, the gain of the second gain control amplifier is set on the basis of the sensitivity deviation information, and the first gain control amplifier is coupled to the second gain control amplifier so that a gain to amplify the positional information is set on the basis of a value obtained by an operation between the gain parameter of the first gain control amplifier and the sensitivity deviation information.

6. The semiconductor device according to claim 5,

wherein the semiconductor device includes a second holding circuit that holds the sensitivity deviation information.

7. The semiconductor device according to claim 2,

wherein the semiconductor device includes a processing unit that forms a driving signal driving a motor on the basis of the amplified positional information.

8. The semiconductor device according to claim 7,

wherein the device is a gyro sensor, and

wherein the processing unit forms the driving signal on the basis of a signal from a hole sensor that detects a position changed by the motor and the amplified positional information.

9. A correction method in a semiconductor device used together with a device that outputs positional information representing a position, the correction method comprising:

a sensitivity deviation information reading step of serially reading sensitivity deviation information representing the sensitivity of the device from the device;

a positional information reading step of serially reading the positional information from the device; and

a correction step of setting a gain to amplify the positional information read in the positional information reading step on the basis of the sensitivity deviation information read in the sensitivity deviation information reading step.

10. The correction method in the semiconductor device according to claim 9,

wherein the sensitivity deviation information represents a deviation between a predetermined sensitivity and the sensitivity of the device, and

wherein the correction step includes a step of operating a gain parameter associated with a reference gain and the sensitivity deviation information.

11. A correction method of a camera module comprising:

a first correction step of vibrating a gyro sensor, measuring the sensitivity of positional information output from the gyro sensor, and correcting the gyro sensor so that the sensitivity obtained by the measurement falls within a predetermined range;

a first storing step of storing the sensitivity of the corrected gyro sensor, as correction information, into a first holding circuit included in the gyro sensor;

a preparation step of preparing a camera module having the gyro sensor, a lens changed in synchronization with the gyro sensor, and a semiconductor device to which the positional information is supplied from the gyro sensor;

an outputting step of outputting the correction information from the first holding circuit in the gyro sensor by the semiconductor device;

a reading step of reading into the semiconductor device the correction information output in the outputting step; and

a second correction step of setting a gain to amplify the positional information output from the gyro sensor in the semiconductor device on the basis of the correction information read in the reading step.

12. The correction method of the camera module according to claim 11,

wherein the correction information is a deviation between a predetermined sensitivity in a predetermined range and the sensitivity of the positional information output from the gyro sensor,

wherein the semiconductor device includes a gain control amplifier that amplifies the positional information, and

wherein the second correction step includes an operation step of operating a gain parameter associated with a reference gain and the correction information, and the gain of the gain control amplifier is set on the basis of a value obtained in the operation step.

13. The correction method of the camera module according to claim 12, comprising a second storing step of storing the value obtained in the operation step into a total parameter holding circuit.

14. The correction method of the camera module according to claim 11,

wherein the correction information is a deviation between a predetermined sensitivity in a predetermined range and the sensitivity of the positional information output from the gyro sensor,

wherein the semiconductor device includes a first gain control amplifier and a second gain control amplifier that amplify the positional information,

wherein the gain of the first gain control amplifier is set on the basis of a gain parameter associated with a reference gain, and

wherein the gain of the second gain control amplifier is set on the basis of the correction information in the second correction step.

15. The correction method of the camera module according to claim 14, comprising a step of storing into a second holding circuit the correction information read in the reading step.