Can Second Function Pin Switch - ZLG MiniPCIeCAN-II Product User Manual

MiniPCIeCAN-II
MiniPCIe Interface CAN Card User Manual

2.4 CAN Second Function Pin Switch

When designing the CAN transceiver circuit or improving the protection level of the
CAN signal cable, consider connecting the second function pin of the CAN signal to the
backplane through the MiniPCIe reserved pin. Design the CAN transceiver circuit by
yourself to improve the system flexibility.
Figure 2.2 CAN signal secondary function selection resistor
The second function pin of the CAN signal is switched by using R24 (this resistor can
be found on the rear of the board, as shown in Figure 2.2). R24 is welded by default. The
system uses the default on-board CAN transceiver ADM3053. When R24 is removed, the
second function pin of the CAN signal is automatically enabled when the system is
powered on. The following table lists the pin sequence. 错误!未找到引用源。 At this time,
R29 and R30 need to weld 0 ohm resistors to enable CAN0, while R31 and R32
respectively weld 0 ohm resistors to enable CAN1.
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