User manual
MCP250XX User’s Guide
DS51266C-page 10 2004 Microchip Technology Inc.
1.6 HARDWARE INSTALLATION
1.6.1 Connecting the DB25 Cable
The included DB25 cable is a male-to-male configuration and plugs into the parallel
port of the host PC. Figure 1-5 shows the pin configuration.
FIGURE 1-5: DB25 PIN CONFIGURATION
1.6.2 9V Power Supply Adapter
The power supply is rated at 9V, 750 mA DC.
1.6.3 DB9 External CAN Bus Connectors (optional)
The DB9 connector, as shown in Figure 1-6, is used to connect the MCP2515 to an
external CAN bus and is not necessary for basic board operation.
FIGURE 1-6: DB9 CAN CONNECTOR
Note: Only the DB9 at J4 is populated. J3 is available as needed.
13121110987654321
252423222120
19
1817
161514
N/C
N/C
N/C
N/C
N/
C
G
ND
G
ND
G
ND
G
ND
G
ND
GND
GND
GND
SP
I
_SO/P
gm
DataOut
SP
I
_SCK
/
Pgm
Cl
k
O
ut
S
P
I_CS
/
Pgm
Dat
aW
RE
N
2
515RES
E
T
/
Pgm
VP
P
_
ON
2
515RT
S
O
/
Pgm
V
DD_
ON
25
15RT
S
1
/Pgm
CL
K
E
N
2
515RT
S
2
BufferE
n
able
251
5I
NT
/
Pgm
DA
T
A
_IN
SP
I
_SI
2515RXBF0
2515RXBF1
54321
Reserv
e
d
CA
NL
CAN_GND
Reserved
N/C
9876
N/
C
CA
NH
N/C
CAN_V
+