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There is a good chance that CAN - Controller Area Network (also
known as CANbus or CAN bus) will soon come to an embedded system near you. Although being
around for 15 years, CAN did not yet reach its peak in regards to market penetration and
still has an impressive growth rate. The CiA (CAN in Automation international users and
manufacturers association) collects and publishes yearly sales figures and forecasts from
the 20ish chip manufacturers producing microcontrollers with on-chip CAN interfaces and
CAN transceivers. The numbers for 2001 were especially impressive, as 2001 was not a great
year for growth in the overall semiconductor industry. Nevertheless, the sales of CAN
nodes increased by about 70% to a total of more than 200 million nodes (sold in 2001) and
the conservative estimate for the upcoming years is a continuous growth rate of at least
30%. For the US, this rate is actually estimated to be much higher, as in the US CAN
currently does not have such a high market penetration as it has in Europe. 
Figure
1 - CAN sales figures
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