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OV7670 Dual Camera Module Application Notes(3人评价)

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OV7670 Dual Camera Module Application Notes

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OV7670 Dual Camera Module Application Notes

OV7670 Dual Camera Module Application Notes

Last Modified: April 2nd, 2007

Document Revision: 1.00

OmniVision Technologies, Inc. reserves the right to make changes without further notice to any product herein to improve reliability, function or design. OmniVision does not assume any liability arising out of the application or use of any project, circuit described herein; neither does it convey any license under its patent nor the right of others.

This document contains information of a proprietary nature. None of this information shall be divulged to persons other than OmniVision Technologies, Inc. employee authorized by the nature of their duties to receive such information, or individuals or organizations authorized by OmniVision Technologies, Inc.

1 Company Confidential

OV7670 Dual Camera Module Application Notes

Table of Contents1. OV7670 Dual Camera Solution........................................................................................................3

1.1 OV7670 Dual Camera Design with 2 Connectors.....................................................................3

1.1.1 Camera Module Reference design..................................................................................... 3

1.1.2 Camera phone Reference Design.......................................................................................41.2 OV7670 Dual Camera Design with Single Connector.............................................................. 5

1.2.1 Camera Module Reference design..................................................................................... 51.2.2 Camera Phone Reference Design.......................................................................................6

2 OV7670 Dual Camera Operation...................................................................................................... 7

2.1 Power Saving Modes................................................................................................................. 7

2.2 Dual Camera Operation in Power Down Mode.........................................................................7

2.2.1 Battery On.......................................................................................................................... 72.2.2 Enter Camera 1...................................................................................................................82.2.3 Exit Camera 1.....................................................................................................................82.2.4 Enter Camera 2...................................................................................................................92.2.5 Exit Camera 2.....................................................................................................................9

2.3 Dual Camera Operation in Power Off Mode............................................................................. 9

2.3.1 Battery On.......................................................................................................................... 9

2.3.2 Enter Camera 1.................................................................................................................102.3.3 Exit Camera 1...................................................................................................................112.3.4 Enter Camera 2.................................................................................................................112.3.5 Exit Camera 2...................................................................................................................12

3. SCCB Bus sharing..........................................................................................................................134. Timing Considerations for Phone PCB Design..............................................................................13

4.1 Sample with PCLK.................................................................................................................. 14

4.2 Sample with XCLK................................................................................................................. 144.3 Using EMI/ESD Device...........................................................................................................15

5. Camera Module Testing................................................................................................................. 155.1 Test Board Modification..........................................................................................................15

5.2 Test Procedure......................................................................................................................... 165.2.1 Test Camera 1.................................................................................................................. 165.2.2 Test Camera 2.................................................................................................................. 16

2 Company Confidential

OV7670 Dual Camera Module Application Notes

1. OV7670 Dual Camera Solution

Dual OV7670 cameras could be used to share single camera port. The PWDN pins of the 2 cameras should be controlled separately by GPIO. The PWDN1 and PWDN2 selects which camera is working and which camera is power down. The outputs (data bus, clock and sync signals) of power down camera could be set to tri-state. So that the outputs of 2 cameras could share same bus.

If dual OV7670 cameras are used in camera phone design, please pay attention to following items.

a. DVDD should be supplied by external power supply. If DVDD is not supplied by external, OV7670 may not be able to initialize correctly by SCCB initialization.

b. PWDN of the two cameras should be controlled separately. PWDN signals are used to select

which camera is working and which camera is standby.c. If power off mode is used, the powers of dual cameras should be turned on/turn off simultaneously. If one camera is power on, the other camera is power off, there would be a big current leakage and the power on camera can not work correctly.

1.1 OV7670 Dual Camera Design with 2 Connectors

Each camera has separate connector. In this case, the camera module design is same as single camera solution.

1.1.1 Camera Module Reference design

Note:AVDD is 2.45V to 2.8V sensor analog power.DVDD is 1.8V sensor digital power.

DOVDD is 2.5V to 3.3V sensor digital IO power.Sensor AGND and DGND should be separated and connect to a single point at outside PCB (Don't connect inside module).C1 should close to sensor VREF and AGND.C2 should close to sensor AVDD and AGND.D7:D0 is module YUV and RGB 8bits output.

3 Company Confidential

OV7670 Dual Camera Module Application Notes

1.1.2 Camera phone Reference DesignIf DOVDD uses different power supply than AVDD, then 3 regulators should be used.

If DOVDD uses the same voltage as AVDD, then only 2 regulators are required. R/C filter is used to separate AVDD from DOVDD.

Please note that

a. The AGND and DGND should be separate inside module and connected together on phone PCB very close to camera module connector.

4 Company Confidential

OV7670 Dual Camera Module Application Notes

b. Strobe (LED) of the 2 cameras should be separated. The strobe LED should face same direction as the driven camera.

c. RESET# pin of camera modules should be controlled by GPIO. It should not be connected to DOVDD as single camera application.

1.2 OV7670 Dual Camera Design with Single Connector

Dual cameras share the same FPC and connector. In this case, the camera module design is different than singe camera application.

1.2.1 Camera Module Reference design

The PWDN and STRB of the 2 sensors are separated. Other pins such as XCLK, RESET#,

SIO_C, SIO_D, D[7:0], PCLK, HREF, VSYNC are connected together to share the same bus.

5 Company Confidential

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