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ZEUS Technical Manual Detailed hardware description
© 2007 Eurotech Ltd Issue D 57
CAN bus
A Microchip MCP2515 CAN 2.0B protocol compatible controller and MCP2551
transceiver are used on the ZEUS to provide Controller Area Network (CAN) bus
connectivity. CAN is a high-integrity serial data communications bus for real-time
applications. It operates at data rates of up to 1 Mbit/s and has excellent error
detection capabilities. A 16MHz clock is supplied to the CAN controller.
The MCP2515 controller connects to the SPI serial interface of the PXA270 processor.
A MCP2551 transceiver is opto-isolated from the rest of the circuit (3.75kV isolation
voltage), but an external isolated 5V supply needs to be provided to supply the
transceiver and the opto-isolators. Alternatively, non-isolated operation is available
through a factory fit option. Contact Eurotech Technical Support
(see page 97) for
details.
The CAN bus interface is broken out to the header J17. For connector details see the
section J17 – CAN bus
, page 87.
Jumpers JP5, JP6 can be used to connect 62Ω termination resistors when the ZEUS is
at the end of the network. Split termination concept is used on ZEUS (see figure
below). For details see the section JP5 & JP6 – CAN bus termination
, page 95.
JP5
JP6
62 Ohm
62 Ohm
C
CAN_H
CAN_L
CAN Transceiver
Split
Termination