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2-18
DSP56F803EVM Hardware User’s Manual
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
for a connection diagram and to
for the CAN signals.
Figure 2-14. CAN Interface
Table 2-8. CAN Header Description
J3 and J13
Pin #
Signal
Pin #
Signal
1
NC
2
NC
3
CANL
4
CANH
5
GND
6
NC
7
NC
8
NC
9
NC
10
NC
DSP56F803
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
JG10
1
2
120
CAN TERMINATION
CANH
J3
U15
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
J13
X
X
X
X
X
X
Содержание DSP56F803
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