CN105677434B - OTP (one time programmable) burning method of image sensor - Google Patents
OTP (one time programmable) burning method of image sensor Download PDFInfo
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- CN105677434B CN105677434B CN201610155114.2A CN201610155114A CN105677434B CN 105677434 B CN105677434 B CN 105677434B CN 201610155114 A CN201610155114 A CN 201610155114A CN 105677434 B CN105677434 B CN 105677434B
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Abstract
The invention provides an OTP burning method of an image sensor, which comprises the steps of burning parameter information corresponding to the image sensor in the OTP of the image sensor; reading the parameter information when the baseband chip drives the image sensor; the first method is as follows: the baseband chip updates the driving parameters of the image sensor carried by the baseband chip according to the parameter information in the OTP, and then initializes the image sensor to enable the image sensor to work in an optimized state; alternatively, the second mode: the baseband chip initializes the image sensor by adopting the drive parameters of the baseband chip, writes the parameter information in the OTP into the image sensor, and partially or completely covers the original drive parameters, so that the image sensor works in an optimized state.
Description
Technical Field
The invention relates to the field of image sensors, in particular to a burning method of a one-time programmable (OTP) memory of an image sensor.
Background
With the rapid development of the image sensor application industry, high pixels and large pixels become the main market demand and development direction, the cost of a single chip also becomes high, and the yield becomes a problem to be considered in large-scale mass production.
Wafer differences, process influences, process changes and the like cause differences in performance of image sensor chips, so that yield of the image sensor is reduced, and card control versions and batches are required, and cost is increased.
An existing image sensor chip is often provided with a one-time programmable (OTP) memory, the OTP memory is generally 8-64 Kbit in capacity and is used for burning parameter information such as White Balance, Lens sharing, VCM (voice Coil motor) and the like, but due to the fact that an image sensor has differentiation, the requirement for specific parameters is difficult to control, and the uncontrollable property of the parameter information of the image sensor chip on a wafer is often generated, so that the wafer batch and version need to be manually controlled. In addition, after the image sensor is connected to a Baseband chip (Baseband), the OTP is read through the Baseband chip, and in the conventional method, the driving parameters are set in the Baseband chip, which causes poor flexibility of the version of the image sensor and requires manual control.
Disclosure of Invention
The invention provides an OTP burning method of an image sensor,
burning parameter information corresponding to an image sensor in an OTP (one time programmable) of the image sensor; reading the parameter information when the baseband chip drives the image sensor;
the first method is as follows: the baseband chip updates the driving parameters of the image sensor carried by the baseband chip according to the parameter information in the OTP, and then initializes the image sensor to enable the image sensor to work in an optimized state;
alternatively, the second mode: the baseband chip initializes the image sensor by adopting the drive parameters of the baseband chip, writes the parameter information in the OTP into the image sensor, and partially or completely covers the original drive parameters, so that the image sensor works in an optimized state.
Preferably, the parameter information of the OTP is pre-compressed to save the storage space of the OTP; and reading and decompressing the parameter information of the OTP through the baseband chip.
Preferably, the parameter information of the OTP is added with check and error correction information, and the check and error correction is performed on the parameter information of the OTP.
Preferably, the OTP parameter information includes register address information, data information, and property information.
The invention records the parameter information in the OTP, wherein the parameter information comprises the drive information of different versions, thereby increasing the flexibility of changing the drive of the image sensor and the compatibility of the drive of the image sensor and reducing the cost.
Drawings
FIG. 1 is a block diagram of an image sensor and a baseband chip according to an embodiment of the invention;
FIG. 2 is a flowchart illustrating an OTP recording method for an image sensor according to an embodiment of the invention;
FIG. 3 is a diagram illustrating an OTP recording method for an image sensor according to another embodiment of the invention.
Detailed Description
In the following detailed description of the preferred embodiments, reference is made to the accompanying drawings which form a part hereof. The accompanying drawings illustrate, by way of example, specific embodiments in which the invention may be practiced. The illustrated embodiments are not intended to be exhaustive of all embodiments according to the invention. It is to be understood that other embodiments may be utilized and structural or logical changes may be made without departing from the scope of the present invention. The following detailed description, therefore, is not to be taken in a limiting sense, and the scope of the present invention is defined by the appended claims.
Referring to fig. 1, fig. 1 is a block diagram of an image sensor and a baseband chip according to an embodiment of the invention;
referring to fig. 1, an image sensor chip 10 in fig. 1 includes an image sensor 11 and a one-time programmable memory (OTP) 12, wherein the OTP12 is burned with parameter information of the image sensor, and the parameter information includes: white balance, lens correction value, drive information, and may further include: register address information, data information, characteristic information, which is a distinguishing parameter of a certain characteristic or performance, and different processing is performed according to the characteristic information in subsequent initialization or other operations. The image sensor is connected to a Baseband chip (Baseband) 20 via several bus protocols, the Baseband chip 20(Baseband) including: a Static Random Access Memory SRAM21 (Static Random Access Memory), in which information such as driving parameters of the image sensor is stored in the SRAM21, and the driving parameters stored in the SRAM are drives of corresponding versions, for example, version a; the baseband chip 20 further includes: and the Register22 and the like read and write information and the like of the OTP through different modules of the baseband chip.
Referring to fig. 2, fig. 2 is a flowchart illustrating a method for recording an OTP of an image sensor according to an embodiment of the invention, referring to fig. 2 and fig. 1,
s200: burning parameter information corresponding to the image sensor in the OTP12 of the image sensor 10; reading the parameter information when the baseband chip 20 drives the image sensor;
s210, the baseband chip 20 updates the image sensor driving parameters of the baseband chip 20 according to the parameter information in the OTP12, and then initializes the image sensor to enable the image sensor to work in an optimized state;
in this embodiment, the priority of the driving information included in the parameter information of the OTP12 is higher than the driving parameters of the image sensor on the baseband chip 20, and the updating mode is an overlay or partial overlay; after the updating step is completed, when the baseband chip 20 drives the image sensor chip, the parameter information is read, and the parameter information includes: white balance, lens correction value, drive information, and may further include: register address information, data information, and characteristic information, which is a distinguishing parameter for a certain type of characteristic or performance, and according to which different processing is performed in subsequent initialization or other operations, it is noted that the OTP12 drives multiple versions of information, such as version B and version C. The characteristic information is, for example: when the charge overflow amount under the strong light source of the image sensor is identified, the overall image sensor may have a deviation of consistency, and the reference voltage value is graded for the reference voltage value that the pixel unit may overflow to the surrounding area to affect the pixel, for example: the image sensor is divided into a first grade to a fourth grade, different image sensors correspond to different grades, and then the different grades are processed according to characteristic information. The optimization state is as follows: the calibrated state.
In the present embodiment, the parameter information of OTP12 may be pre-compressed to save the storage space of OTP 12; parameter information of the OTP12 is decompressed by the baseband chip 20.
In this embodiment, check and error correction information may be added to the parameter information of the OTP12, and the baseband chip 20 is used to check and correct the parameter information of the OTP 12.
In the embodiment, the OTP parameter information includes register address information and data information, and the controllability of the register address information and the data information can increase the flexibility of changing the driving. Thus, image sensors of the same batch or a specific batch are arranged on the wafer in a controllable mode.
Referring to fig. 3, fig. 3 is a flowchart illustrating a method for recording an OTP of an image sensor according to another embodiment of the invention, referring to fig. 3 and fig. 1,
s300: burning parameter information corresponding to the image sensor in the OTP12 of the image sensor 10; reading the parameter information when the baseband chip 20 drives the image sensor chip;
s310, the baseband chip 20 initializes the image sensor by adopting the drive parameters of the baseband chip, and then writes the parameter information in the OTP12 into the image sensor 10, or selects different drive parameters according to preset values; and the original driving parameters are partially or completely covered, so that the image sensor works in an optimized state.
The parameter information includes: white balance, lens correction value, drive information, and may further include: the register address information, the data information, the characteristic information is a distinguishing parameter for a certain characteristic or performance, different processing is performed according to the characteristic information in subsequent initialization or other operations, and the characteristic information in the present embodiment is the same as the characteristic information in the previous embodiment in nature. The original driving parameters are driving parameters of the baseband chip 20. The optimization state is as follows: the calibrated state.
In the embodiment, the parameter information of the OTP12 can be pre-compressed to save the storage space of the OTP; parameter information of the OTP12 is decompressed by the baseband chip 20.
In this embodiment, check and error correction information may be further added to the parameter information of the OTP, and the baseband chip is used to perform check and error correction on the parameter information of the OTP.
In the embodiment, the OTP parameter information includes register address information and data information, and the controllability of the register address information and the data information can increase the flexibility of changing the driving. Thus, image sensors of the same batch or a specific batch are arranged on the wafer in a controllable mode.
Referring to fig. 1 to 3, when reading the parameter information of the OTP, the white balance is written into the sram21, and the lens correction value is written into the register 22.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are, therefore, to be considered in all respects as illustrative and not restrictive.
Claims (3)
1. An OTP burning method of an image sensor is characterized in that,
burning parameter information corresponding to an image sensor in an OTP (one time programmable) of the image sensor; reading the parameter information when the baseband chip drives the image sensor;
the first method is as follows: the baseband chip updates the driving parameters of the image sensor carried by the baseband chip according to the parameter information in the OTP, and then initializes the image sensor to enable the image sensor to work in an optimized state;
alternatively, the second mode: the baseband chip initializes the image sensor by adopting the drive parameters of the baseband chip, writes the parameter information in the OTP into the image sensor, and partially or completely covers the original drive parameters to ensure that the image sensor works in an optimized state;
the parameter information in the OTP comprises register address information, data information and characteristic information.
2. The OTP burning method of an image sensor as claimed in claim 1, wherein the parameter information of the OTP is pre-compressed to save the storage space of the OTP; and reading and decompressing the parameter information of the OTP through the baseband chip.
3. The OTP burning method of claim 1, wherein the parameter information of the OTP is verified and corrected by adding verification and correction information to the parameter information of the OTP.
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| CN107025740B (en) * | 2017-05-17 | 2019-12-10 | 深圳怡化电脑股份有限公司 | Device driving method and device |
| CN109947160B (en) * | 2019-04-10 | 2021-07-06 | 苏州浪潮智能科技有限公司 | Output adjusting method and device of voltage regulator |
| CN110942486B (en) * | 2019-12-12 | 2023-02-28 | 展讯通信（上海）有限公司 | Method and device for storing camera calibration parameters and storage medium |
| CN112689095A (en) * | 2020-12-29 | 2021-04-20 | 上海摩勤智能技术有限公司 | Camera sensor focusing data calibration method and camera sensor |
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