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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
Table 2-13
for the CAN connector signals and
diagram.
56F8346
CAN_TX
CAN_RX
MOTOROLA
Freescale Semiconductor, Inc.
+5.0V
1K
CAN Transceiver
TXD
CANH
CANL
RXD
PCA82C250T
Figure 2-13. CAN Interface
Table 2-13. CAN Header Description
J5 and J6
Pin #
Signal
1
NC
3
CANL
5
GND
7
NC
9
NC
Technical Summary
For More Information On This Product,
Go to: www.freescale.com
Figure 2-13
for a connection
J5
4
5
3
J6
4
5
3
JG11
1
2
120
Pin #
Signal
2
NC
4
CANH
6
NC
8
NC
10
NC
CAN Interface
CAN Bus
Connector
Daisy-Chain CAN
Connector
CAN Bus
Terminator
2-23
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