1. Introduction
The ALINX AN5641 is a compact 5-megapixel (5MP) camera module designed for integration with FPGA development boards and other embedded systems. It utilizes the OmniVision OV5640 CMOS image sensor, providing high-quality image capture capabilities. The module supports both DVP (Digital Video Port) and MIPI (Mobile Industry Processor Interface) interfaces, with image transmission primarily achieved through the MIPI interface and an FPGA connection. Its small form factor and comprehensive features make it suitable for various imaging applications.
2. Specifications
| Feature | Description |
|---|---|
| Image Sensor | OmniVision OV5640 CMOS |
| Resolution | 5 Megapixels (5MP) |
| Optical Format | 1/4" |
| Image Formats | RAW RGB, RGB565/555/444, CCIR656, YUV422/420, YCbCr422 with compression |
| Capture Resolutions | QSXGA (2592x1944), 1080p, 1280x960, VGA (640x480), QVGA (320x240) |
| Interface | FPC interface (1.0mm spacing, 15 pins) for MIPI (2LANE) and DVP communication |
| Functions Supported | Manual focusing, Automatic Exposure Control (AEC), Automatic White Balance (AWB) |
| Working Temperature | -30°C to 70°C |
| Dimensions | 35 mm x 24 mm |
| Compatible With | FPGA Demo Boards |
| Accessory Type | Camera Module |
3. Setup and Pin Assignment
The AN5641 camera module connects to a compatible development board, typically an FPGA board, via its 15-pin FPC (Flexible Printed Circuit) connector. Ensure proper orientation and secure connection to avoid damage.
3.1 Pin Assignment
The following table details the pin assignments for the 15-pin FPC connector on the AN5641 module:
| Pin No. | Signal Name | Description |
|---|---|---|
| 1 | +3.3V | Power Supply (3.3V) |
| 2 | GND | Ground |
| 3 | MIPI_CLK_P | MIPI Clock Lane Positive |
| 4 | MIPI_CLK_N | MIPI Clock Lane Negative |
| 5 | MIPI_D0_P | MIPI Data Lane 0 Positive |
| 6 | MIPI_D0_N | MIPI Data Lane 0 Negative |
| 7 | MIPI_D1_P | MIPI Data Lane 1 Positive |
| 8 | MIPI_D1_N | MIPI Data Lane 1 Negative |
| 9 | SCL | I2C Serial Clock Line |
| 10 | SDA | I2C Serial Data Line |
| 11 | PWDN | Power Down Pin |
| 12 | RST | Reset Pin |
| 13 | VSYNC | Vertical Sync Output |
| 14 | HREF | Horizontal Reference Output |
| 15 | PCLK | Pixel Clock Output |
3.2 Connection to FPGA Board
Connect the 15-pin FPC cable from the AN5641 module to the corresponding MIPI or DVP interface on your FPGA development board. Ensure the cable is inserted correctly and latched securely. Refer to your FPGA board's documentation for specific camera interface port details and configuration.
4. Operating Instructions
Once the AN5641 module is physically connected to your development board and the necessary drivers/firmware are loaded onto the FPGA, you can begin capturing images. The OV5640 sensor supports various operational modes and features:
- Image Capture: The module can capture images at resolutions up to QSXGA (2592x1944) and various lower resolutions including 1080p, 1280x960, VGA, and QVGA.
- Focusing: The lens supports manual focusing. Adjust the lens ring to achieve the desired sharpness for your application.
- Exposure Control: The sensor features Automatic Exposure Control (AEC) to dynamically adjust exposure settings based on ambient light conditions, ensuring optimal image brightness.
- White Balance: Automatic White Balance (AWB) is implemented to correct color casts and ensure accurate color reproduction under different lighting environments.
- Interface: Image data is transmitted via the MIPI interface (2LANE). Ensure your FPGA design is configured to receive and process MIPI data streams correctly.
For detailed programming and configuration of the OV5640 sensor, refer to the sensor's datasheet and any provided example code or libraries from ALINX or your FPGA board manufacturer.
5. Maintenance
The ALINX AN5641 camera module is a delicate electronic component. Follow these guidelines for proper maintenance:
- Handling: Always handle the module by its edges to avoid touching the lens or the circuit board components. Static electricity can damage the module; use anti-static precautions when handling.
- Cleaning: Keep the lens clean. Use a soft, lint-free cloth specifically designed for optical lenses to gently wipe away dust or smudges. Avoid using harsh chemicals.
- Storage: When not in use, store the module in an anti-static bag in a dry, dust-free environment.
- Environmental Conditions: Operate the module within the specified working temperature range of -30°C to 70°C. Avoid exposure to extreme temperatures, humidity, or direct sunlight.
6. Troubleshooting
If you encounter issues with your AN5641 camera module, consider the following troubleshooting steps:
- No Image Output:
- Verify all cable connections are secure and correctly oriented, especially the FPC cable.
- Ensure the development board is powered on and receiving sufficient power.
- Check the FPGA configuration and ensure the MIPI/DVP interface is correctly initialized and configured to communicate with the OV5640 sensor.
- Confirm that the necessary drivers or IP cores for the OV5640 are loaded and functioning on your FPGA.
- Check the PWDN and RST pins for correct logic levels as per the OV5640 datasheet.
- Poor Image Quality:
- Adjust the manual focus of the lens.
- Ensure adequate lighting in the environment.
- Check for dust or smudges on the lens and clean if necessary.
- Review your FPGA's image processing pipeline for any errors or incorrect settings (e.g., color space conversion, scaling).
- Module Not Detected:
- Verify the I2C communication (SCL, SDA lines) between the FPGA and the OV5640 sensor. The sensor is typically configured via I2C.
- Ensure the module is receiving the correct 3.3V power supply.
For more advanced troubleshooting, consult the OV5640 datasheet and the documentation for your specific FPGA development board.
7. User Tips
(Note: No specific user reviews or Q&A data were provided to generate user tips. General advice for camera modules includes ensuring stable power supply, proper heat dissipation for prolonged use, and careful handling of the FPC connector.)
8. Warranty and Support
For warranty information and technical support, please refer to the official ALINX website or contact your vendor directly. Keep your purchase records for any warranty claims.
