M.2CANFD
M.2 Interface CAN (FD) Card
©2022 Guangzhou ZLG Electronics Co., Ltd.
7
User Manual
Set the DIP switch of the corresponding channel to "ON", or connect a 120 ohm terminal
resistance between CAN_H and CAN_L of the corresponding CAN channel.
Figure 2.1 Terminal resistance selection switch
2.4
CAN Second Function Pin Switch
When you need to design the CAN transceiver circuit or improve the protection level
of the CAN signal line, you can consider connecting the second function pin of the CAN
signal to the backplane through the M.2 reserved pin. Designing the CAN transceiver circuit
yourself improves the system flexibility.
The CAN signal secondary function pin is switched through the pad jumper JP2 (as
shown in Figure 2.2). JP2 is disconnected by default, and the system uses the default on-
board CAN transceiver. When JP2 is short-circuited with solder, the second function pin of
CAN signal is automatically enabled when the system is powered on. Table 2.3 lists the pin
definitions.
Figure 2.2 CAN-TTL switch jumper
