The phyCAM series of camera modules allow for the easy and efficient configuration of microcontroller designs with image processing technology.
Camera modules with 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-117 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 AR0521
The camera module is equipped with an AR0521 image sensor from ON Semiconductor. The sensor has a resolution of 2592 (H) x 1944 (V) = 5.038848 MPixels with a sensor format of 1/2.5". The image sensor is equipped with a rolling shutter (global reset mode is also supported) and is available in a monochrome version or with a Bayer pattern color mask. 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 by means of an NDA with ON Semiconductor.
The camera sensor of the VM-117 - like other phyCAM modules - allows for the reduction of the effective image resolution by different methods. This allows image detail and the amount of data generated to be optimally adapted to the requirements of the application. By reducing the resolution, the frame rate can also be increased.
Depending on the desired resolution and the requirements of the application, various methods can be used to reduce the resolution:
windowing/cropping/ROI: The image is only read from a partial area of the sensor (Region of Interest - ROI). Pixels outside this field are skipped. This process reduces the effective size of the image window on the sensor, which must be taken into account when calculating the optics. The start of the image window can be shifted on the physical sensor, enabling electronic panning.
binning: Binning combines neighboring pixels. 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 nearest pixels of the same color (see sensor datasheet).
skipping: Pixels are skipped during readout. The effective sensor area is only reduced to a lesser extent, if at all when the resolution is reduced. This may be useful when calculating the optics or when switching between different modes (electronic zoom).
Lens and Color Shading Correction
An algorithm for lens shading correction is integrated into the sensor. For more information, please refer to the sensor's datasheet.
Single-board computers (SBC kits) for various controller platforms are available to support camera commissioning and development. The range of suitable kits is constantly being expanded. Please check our website for currently available kits. The PHYTEC sales department will be happy to advise you on the composition of kits and components.
The junction temperature can be read out. Depending on the operating state, the ambient temperature may fluctuate.
Y8 (8 Bit Graustufenauflösung)
Y10 (10 Bit Graustufenauflösung)
Y12 (12 Bit Graustufenauflösung)
RGGB8 (8 Bit Bayer-Pattern)
RGGB10 (10 Bit Bayer-Pattern)
RGGB12 (12 Bit Bayer-Pattern)
Configuration GPIO Camera Sensor
VM-117 (phyCAM-M) I2C Addresses
Additional I2C addresses can be configured within the camera sensor by software.
The address functionality must be enabled and assigned to a GPIO in the camera sensor before it can be used. For details, please refer to the sensor datasheet.
VM-117 (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.
GPIO Camera Sensor
Trigger Standby I2C_ADR
VM-117 (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.
Current DXF and STEP data for your design are available on our website.
The trigger input provides the following function:
As an example, if the GPIO2 of the camera sensor connected to the trigger is configured as standby, a trigger function can be generated. A low level at the trigger input stops image acquisition in this case.
Details about triggering can be found in the datasheet of the camera sensor.
The trigger input is available at CTRL2 (pin 12) of the phyCAM-M connector.
The strobe output provides the following function:
LED Flash: A high level is an output during the exposure time of the image sensor. Here GPIO0 must be configured to flash.
Xenon Flash: The strobe pulse is configurable. GPIO0 must be configured to flash.
Details about the strobe signal can be found in the datasheet of the camera sensor.
The strobe signal is available at CTRL1 (pin 11) of the phyCAM-M connector.
The strobe signal is an open-drain output and requires a pull-up resistor on the application board.
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