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2.20 CAN Interface
The 56F805EVM board contains a CAN physical-layer interface chip that is attached to
the MSCAN_RX and MSCAN_TX pins on the 56F805. The EVM board uses a Philips
PCA82C250, high speed, 1Mbps, physical layer interface chip. Due to the +5.0V
operating voltage of the CAN chip, a pull-up to +5.0V is required to level shift the
Transmit Data output line from the 56F805. A primary, J26, and daisy-chain, J32, 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 JG17. Refer to
for the CAN connector signals and
56F805
MSCAN_TX
MSCAN_RX
Pin #
2-22
Freescale Semiconductor, Inc.
Figure 2-17
+5.0V
U20
1
3
TXD
VCC
5
VREF
4
7
RXD
CANH
6
CANL
8
2
SLOPE
GND
PCA82C250T
Figure 2-17. CAN Interface
Table 2-13. CAN Header Description
J26 and J32
Signal
1
NC
3
CANL
5
GND
7
NC
9
NC
56F805EVM Hardware User's Manual
For More Information On This Product,
Go to: www.freescale.com
for a connection diagram.
CAN CONNECTOR
X
X
X
120
CAN TERMINATION
X
X
X
DAISY-CHAIN
CAN CONNECTOR
Pin #
Signal
2
NC
4
CANH
6
NC
8
NC
10
NC
Table 2-13
J26
1
X
2
3
4
5
X
6
7
X
8
9
X
10
JG17
1
2
J32
1
X
2
3
4
5
X
6
7
X
8
9
X
10
MOTOROLA
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