AW00136902000
Hardware Design Recommendations
Basler dart BCON
47
Design Recommendations for the I²C Interface
The voltage level for the I²C bus is 3.3 V. Make sure that the pull-up resistor is connected to
3.3 V.
If you have only one or two cameras, tie the I2C_ID pin to GND on the first camera and to
3.3 V on the second camera. This helps you to identify which camera is connected to a given
data interface.
The capacitive bus load for a single I²C bus segment is limited to 400 pF. Take into account
that long flexible flat cables can significantly contribute to the total bus load. If necessary, use
more than one I²C bus or use an I²C bus repeater.
Choose a suitable pull-up resistor. The optimal value depends on the capacitive load of the I²C
bus lines. For determining appropriate resistor values, refer to the
I²C-bus Specification and
User Manual
.
6.4
Power Supply (GND, VCC)
The camera needs a single 5 V power supply. Bad power quality can deteriorate the camera's
image quality. However, a properly designed switched-mode power supply, as used to supply a
USB port, will yield a good result.
Design Recommendations for the Power Supply
The power supply should be able to supply 1.5 W per camera. Note that long cables can cause
a significant voltage drop, leading to a higher power consumption than the camera alone.
Ground noise can cause bad image quality. Make sure that the power supply input (VCC and
GND) is close to the camera connectors. The processor and the memory should not be placed
between the power supply input and the camera connector.
Provide an extra capacitor directly on the camera connector where the supply voltage is
delivered to the camera (e.g. 10 µF MLCC - multi-layer ceramic capacitor). If the supply is
noisy, a low-pass-filter consisting of a capacitor and an inductor can help to smoothen the
supply voltage.
