phyCORE-LPC2292/94
56
©
PHYTEC Messtechnik GmbH 2006 L-658e_5
6.2
CAN Interface
The phyCORE-LPC2292/94 is designed to house two CAN
transceivers at U605 and U606 (either PCA82C251 or TLE6250V33).
The CAN bus transceiver devices support signal conversion of the
CAN transmit (CANTx) and receive (CANRx)lines. The CAN
transceiver supports up to 110 nodes on a single CAN bus. Data
transmission occurs with differential signals between CANH and
CANL. A Ground connection between nodes on a CAN bus is not
required, yet is recommended to better protect the network from
electromagnetic interference (EMI). In order to ensure proper message
transmission via the CAN bus, a 120 Ohm termination resistor must be
connected to each end of the CAN bus.
For larger CAN bus systems, an external opto-coupler should be
implemented to galvanically separate the CAN transceiver and the
phyCORE-LPC2292/94. This requires removal of the on-board CAN
transceivers and routing the CANTx and CANRx lines to the
phyCORE connector X700 by closing Jumpers J602, J603, J604 and
J605. For connection of the CANTx and CANRx lines to an external
transceiver we recommend using a Hewlett Packard HCPL06xx or a
Toshiba TLP113 fast opto-coupler. Parameters for configuring a
proper CAN bus system can be found in the DS102 norms from the
CiA
1
(CAN in Automation) User and Manufacturer's Interest Group.
____________________________
1
:
CiA: CAN in Automation. Founded in March 1992, CiA provides technical, product and
marketing information with the aim of fostering Controller Area Network’s image and
providing a path for future developments of the CAN protocol.
Содержание phyCORE-LPC2292/94
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