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2.18 CAN Interface
The DSP56F803EVM board contains a CAN physical-layer interface chip that is attached
to the MSCAN_RX and MSCAN_TX pins on the DSP56F803. 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 DSP56F803. A primary, J3, and a daisy-chain, J13,
CAN connector are provided to allow easy daisy-chaining of CAN devices. Refer to
Figure 2-14
for a connection diagram and to
DSP56F803
MSCAN_TX
MSCAN_RX
2-18
U15
1
3
TXD
VCC
5
VREF
4
7
RXD
CANH
6
CANL
2
8
SLOPE
GND
PCA82C250T
Figure 2-14. CAN Interface
Table 2-8. CAN Header Description
J3 and J13
Pin #
Signal
1
NC
3
CANL
5
GND
7
NC
9
NC
DSP56F803EVM Hardware User's Manual
Table 2-8
for the CAN signals.
+5.0V
120
Pin #
Signal
2
NC
4
CANH
6
NC
8
NC
10
NC
CAN CONNECTOR
J3
X
1
X
2
3
4
5
X
6
X
X
7
8
X
9
X
10
JG10
1
2
CAN TERMINATION
J13
X
1
X
2
3
4
5
X
6
X
7
X
8
X
9
X
10
DAISY-CHAIN
CAN CONNECTOR
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