CAN Interfaces
Technical Summary, Rev. 2
Freescale Semiconductor
2-23
Preliminary
2.13 CAN Interfaces
The 56F8367EVM board contains two FlexCAN interfaces. The primary CAN interface uses the
CAN1_RX and CAN1_TX pins on the 56F8367. The secondary CAN interface uses the
CAN2_RX and CAN2_TX pins on the 56F8367.
2.13.1 FlexCAN #1 Interface
The 56F8367EVM board contains a CAN physical-layer interface chip that is attached to the
FlexCAN port’s CAN1_RX and CAN1_TX pins on the 56F8367. The EVM board uses a Phillips
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 56F8367. The CANH and CANL signals pass through inductors before
attaching to the CAN bus connectors. A primary, J20, and daisy-chain, J21, 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 JG13. Refer to
for the CAN connector signals and
for a connection diagram.
MC56F8367
+5.0V
CAN Transceiver
J20
Daisy-Chain CAN #1
Connector
J21
CAN #1 Bus
Connector
CAN Bus #1
Terminator
JG13
120
PCA82C250
1K
CAN1_TX
CAN1_RX
1
2
3
4
5
4
3
5
CANH
CANL
TXD
RXD
Figure 2-11. CAN #1 Interface