Today the different electronic devices have an increasing role in our lives. They not only make life easier, simpler, but can also make our everyday lives more economical. Over the past decade the various building automation systems became wide spread, but (due to their prices) they did not appear in the household, but in big office buildings and industrial facilities.
The device developed by me is the prototype of a component of such a building automation system. The devices in this system are able to communicate in many different ways. The two most important communication interfaces are the Ethernet network and the CAN, which is the field-bus of the system. The purpose of my diploma is to design a prototype of a device which would be able to get connection between these two communication interfaces.
In such a complex design the proper conceptual planning and specification are very important. Determination of the requirements is a very important part of the design process. Since this device is a prototype, there will be some functions which would not be found later in the final version of the device.
The most important task is to choose the microcontroller. In this step we need to consider the software and the hardware requirements. After selecting the components we need to design the power supply. It is important to define the consumption of the power supplies and the stability of the voltage levels, and to ensure the proper power-up and power-down sequence.
Since the device contains high speed interfaces, different signal integrity problems can come up. It is necessary to recognize and solve these problems.
After choosing the components and solving the signal integrity problems we can draw the schematics, and route the PCB. After these steps we can vivify and test the device.