XR31233 / XR31234 / XR31235 Evaluation Board User’s Manual
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Configuring Pin 5 (LBK / EN / AB) Mode Selection - E2
See the E2 connection in Table 6 to configure the input of
pin 5:
Transceiver
Pin
Name
Input
Logic
Level
E2
Connection
XR31233
LBK
Loopback
mode input
1
3-5
0
4-5
(factory setting)
XR31234
EN
Enable
input
1
3-5
(factory setting)
0
4-5
XR31235
AB
Autobaud
loopback
mode input
1
3-5
0
4-5
(factory setting)
Table 6: Pin 5 Configuration
CAN Bus Split Termination - E2, J14, J15, C3, C5, C6, R6
and R9
For CAN Bus split termination, instead of using Table 6,
connect E2 1-5 and 2-5. Populate C3, C5, C6, R6 and R9.
Connect VRxD to J15. J14 can be used for probing.
CAN Bus Transceiver Socket - U2
Provisions are made on the EVB to install a socket (U2) if
desired.
High Transcient Protection - D2
Provisions are made to add high transcient protection (D2)
if desired.
Pin Configurations
1
2
3
4
D
GND
VCC
R
RS
CANH
CANL
LBK
8
7
6
5
1
2
3
4
D
GND
VCC
R
RS
CANH
CANL
EN
8
7
6
5
1
2
3
4
D
GND
VCC
R
RS
CAHN
CANL
AB
8
7
6
5
Figure 3: Pin Configurations for the XR31233, XR31234 and XR31235 CAN Bus Transceivers
Top View, XR31233
Top View, XR31235
Top View, XR31234