CAN Interface
MOTOROLA
Technical Summary
2-23
2.15 CAN Interface
The 56F8346EVM board contains a CAN physical-layer interface chip that is attached to
the FlexCAN port’s CAN_RX and CAN_TX pins on the 56F8346EVM. The EVM board
uses a Philips high-speed, 1.0Mbps, physical layer interface chip,PCA82C250. Due to the
+5.0V operating voltage of the CAN interface chip, a pull-up to +5.0V is required to level
shift the Transmit Data output line from the 56F8346. The CANH and CANL signals pass
through inductors before attaching to the CAN bus connectors. A primary, J5, and
daisy-chain, J6, CAN connector are provided to allow easy daisy-chaining of CAN
devices. CAN bus termination of 120 ohms can be provided by adding a jumper to JG11.
Refer to
for the CAN connector signals and
for a connection
diagram.
Figure 2-13. CAN Interface
Table 2-13. CAN Header Description
J5 and J6
Pin #
Signal
Pin #
Signal
1
NC
2
NC
3
CANL
4
CANH
5
GND
6
NC
7
NC
8
NC
9
NC
10
NC
56F8346
+5.0V
CAN Transceiver
J5
Daisy-Chain CAN
Connector
J6
CAN Bus
Connector
CAN Bus
Terminator
JG11
120
PCA82C250T
1K
CAN_TX
CAN_RX
1
2
3
4
5
4
3
5
CANH
CANL
TXD
RXD
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Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
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