The phyCAM series of camera modules allow for the easy and efficient configuration of microcontroller designs with image processing technology. Camera modules with a phyCAM interface can be directly connected to the digital camera interface of selected PHYTEC microcontroller modules. This allows for easy integration of camera technology into compact, project-specific designed products. Many BSPs (Board Support Packages) of PHYTEC microcontroller modules already contain the corresponding software drivers for the phyCAM modules.
Due to the open interface definition, phyCAM modules can also be used together with other microcontrollers or hardware designs that have a corresponding camera interface. The interfaces of the phyCAM products are identical within the respective product series. This makes it possible to connect different camera modules with the same application circuit and allows scalability during the design phase and in future design variants.
Evaluation kits are available for the development phase.
We recommend considering the information in these two documents before integrating the camera module.
Function Overview VM-120 Camera Modules
On-board Clock Generation
The master clock (MCLK) for the camera sensor is generated with a 27 MHz oscillator on the camera module. The internal PLL of the camera sensor is used to generate the required operating frequency of the sensor. As a result, it is not necessary to generate the master clock externally and route it to the camera module.
For more information, please refer to the sensor's datasheet.
The camera modules are equipped with a 2 kB EEPROM (M24C02-R or compatible). It can be used, for example, to store individual configurations or an identification number. The addressing of the EEPROM can be done individually by solder jumpers. The addressing is described in more detail in the corresponding sections Special Functions of the individual interface variants.
Further information can be found in the datasheet of the EEPROM
Image Sensor AR0234
The camera module is equipped with an AR0234CS image sensor from ON Semiconductor. The sensor has a resolution of 1920 (H) x 1200 (V) = 2.3 MPixels with a sensor format of 1/2.6".
The image sensor is equipped with a global shutter and is available in a monochrome version or with a Bayer Pattern color mask. Due to the phyCAM concept, the special functions of the sensor are available on almost all interface variants. Further information on the individual functions of the sensor can be found in the manufacturer's datasheet.
For detailed technical data, please refer to the datasheet of the camera sensor. At the time of writing this document, the information is subject to confidentiality and can only be viewed using an NDA with ON Semiconductor.
The camera sensor of the VM-120 - like other phyCAM modules - allows for the reduction of the effective image resolution by different methods. This allows image details and the amount of data generated to be optimally adapted to the requirements of the application. The frame rate can also be increased by reducing the resolution.
Depending on the desired resolution and requirements of the application, various methods can be used to reduce the resolution:
Windowing/cropping/ROI: The image is only read from a part of the sensor Region of Interest (ROI). Pixels outside this field are skipped. This method reduces the effective size of the image window on the sensor, which must be taken into account when calculating the optics. The beginning of the image window can be shifted on the physical sensor, allowing electronic panning.
binning: In binning, neighboring pixels are combined. This increases the effective size of a pixel and the light sensitivity increases. With color sensors, it should be noted that directly adjacent pixels are not combined, but the next pixels of the same color (see sensor datasheet).
skipping: When reading, pixels are skipped. The effective sensor area is therefore not reduced or only slightly reduced when the resolution is reduced. This may be useful when calculating the optics or when switching between different modes (electronic zoom).
In addition to the image information, two further lines can be output with statistical data of the image.
Further information can be found in the datasheet of the sensor.
Lens Shading Correction
An algorithm for correcting lens shading is integrated into the sensor.
Further information can be found in the datasheet of the sensor.
The DPCM (differential pulse code modulation) method is available for compression from 10 to 8 bits.This procedure is intended to minimize processing power and memory size requirements.
See the sensor datasheet for more information.
Single Board Computer (SBC) kits are available for various microprocessor platforms and operating systems for testing camera modules and application development. PHYTEC is continuously expanding the platforms supported in these kits. Please refer to www.phytec.de for the latest information on available kits. Our sales and support team is ready to assist in the selection of the appropriate kits and image-processing hardware.
2,3 MPixel – Sensor (2.304.000 Pixel)
monochrome (VM-120-BW-M) oder color (VM-120-COL-M)
phyCAM-M – Schnittstelle
Framerate: 120 fps (volle Auflösung)
Framerate: 268 fps bei HD 720p (theoretischer Wert)
Depending on the operating status and heat dissipation measures, the ambient temperature may fluctuate.
Y8 (8 Bit Graustufenauflösung)
Y10 (10 Bit Graustufenauflösung)
RGGB8 (8 Bit Bayer-Pattern)
RGGB10 (10 Bit Bayer-Pattern)
VM-120 (phyCAM-M) I2C Addresses
Additional I2C addresses can be configured within the camera sensor by software.
VM-120 (phyCAM-M) EEPROM I2C Addresses
The I²C addresses are specified hexadecimal in 8-bit representation. In Linux, it is possible to work with a 7-bit representation. In this case, the address value is to be shifted one digit to the right. The specification refers to the write address (bit 0 = 0). The read address is increased by 1 according to bit 1 = 1.
Trigger Standby I2C_ADR
VM-120 (phyCAM-M) Feature Pins
Specify the internal configuration of the camera module to activate this function.
Functions can be mutually exclusive!
Furthermore, the camera sensor must be configured correctly to give the corresponding GPIO the correct functionality.
NOMT = not mounted = unassembled
Special configurations can be equipped by PHYTEC for series deliveries. Please contact our sales staff for further information.
The signals CTRL1 (Strobe Output) and CTRL3 (Shutter Output) are open-drain outputs. A pull-up resistor must be provided on the baseboard in each case.
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