2-22
56F805EVM Hardware User’s Manual
MOTOROLA
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
for a connection diagram.
Figure 2-17. CAN Interface
Table 2-13. CAN Header Description
J26 and J32
Pin #
Signal
Pin #
Signal
1
NC
2
NC
3
CANL
4
CANH
5
GND
6
NC
7
NC
8
NC
9
NC
10
NC
56F805
MSCAN_TX
MSCAN_RX
CAN CONNECTOR
TXD
RXD
SLOPE
VREF
VCC
GND
CANL
PCA82C250T
1
3
5
7
9
2
4
6
8
10
X
JG17
1
2
120
CAN TERMINATION
CANH
J26
U20
1
4
8
+5.0V
3
5
2
DAISY-CHAIN
CAN CONNECTOR
7
6
X
X
X
X
X
X
1
3
5
7
9
2
4
6
8
10
X
J32
X
X
X
X
X
X
F
re
e
sc
a
le
S
e
m
ic
o
n
d
u
c
to
r,
I
Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
n
c
.
..