The DCAN250 device is an additional physical layer for CAN-bus communication over DC power-line. The device can operate as a "transceiver" in the automotive vehicle environment.
Messages from the CAN-bus controller are stored in the transmit FIFO. The data is then coded by a strong error correction code especially designed to meet the power-line typical channel burst noises, and is modulated by a differential QPSK modulator that drives the noisy line (through a passive filter). In the receive side, the messages are converted back into the CAN-bus protocol.
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The DC-BUS system consists of up to 16 devices (nodes). It provides services required realizing the CAN-bus physical layer. The DC-BUS network operate as a CSMA channel dedicated for data, control and even voice communication over noisy DC power-line. Main characteristics are:
Center frequency: F0 - 2.5 MHz, F1 - 5MHz (Configurable)
Data transfer rate: 250 Kbps.
Cable length: Up to 12 m on a DC cable.
Number of Devices: Up to 16 nodes per channel
The DCAN250 device enables CAN-bus messages communication over vehicle's dedicated DC power-line. The device can operate on each of its two channels (F0 and F1). The device is an additional physical layer for the CAN protocol and can become a redundant communication channel for CAN-bus messages.
It is well understood that the integration of new car electronic systems in vehicles requires comprehensive communication within the car. The devices offers a unique communication solution between units installed in locations having only single DC power-line. The devices provide a reliable universal communication link that withstands the noises on battery lines.
Ease of use - The CAN-bus transceiver to the power-line enables a simple installation of plug and play units, reducing the need for transceiver and twisted pair cables with its associated costs.
Unit expansion - Adding a new unit into the car environment is complicated and has compatibility problems. As each new function or capability is added to the car electronics, new cable has to be added for operability. The DCAN250 devices are the answer to connectivity for car electronics architecture. It is a fast, multi node, low-cost solution, combining power and data on same cable.
