CANDTU-400EWGR
CAN Bus Message Records and Wireless Data Transmission Equipment Series Products
©2021 Guangzhou ZLG Microelectronics Technology Corp.,Ltd.
11
User Manual
DI1_P
Digital 1 input channel positive
9
DI1_N
Digital 1 input channel negative
4
Table 4.8 CAN-Bus interface specifications
parameter
Minimu
m
Typical
value
Maximu
m
Unit
Communication baud rate
5k
1M
bps
Number of nodes
110
pcs
Dominant level (logic 0)
CANH
2.75
3.5
4.5
V
CANL
0.5
1.5
2
Recessive level (logic 1)
CANH
2
2.5
3
CANL
2
2.5
3
Differential level
Dominant (logic 0)
1.2
2
3.1
Recessive (logic 1)
-0.5
0
0.05
Maximum withstand
voltage of the bus pin
-18
18
Instantaneous voltage of
the bus
-100
+100
Isolation voltage (DC)
3500
V
Figure 4 Typical network connection of high-speed CAN
The CAN bus adopts balanced transmission. ISO11898-2 stipulates: In the
high-speed CAN, a 120 ohm terminal resistor needs to be connected to the network
terminal node to eliminate signal reflection on the bus and avoid signal distortion. Figure
3.2 shows the high-speed CAN network topology.
The device has a built-in 120 ohm terminal resistance, which can be configured to
turn on or off by using the configuration tool CANDTU. For operation details, see 4.3.1.
Note: The bus communication distance and communication rate are related to the
field application and can be designed according to the actual application and related
standards. The CAN-Bus cable can use ordinary twisted pair, shielded twisted pair or
standard bus communication cable. In long-distance communication, the terminal
resistance value needs to be selected according to the communication distance, cable
impedance and number of nodes.
The device provides two digital outputs. The physical form of the interface is a flange
terminal.
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and
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list the interface schematic
diagram, signal definition, and interface specifications.
Table 9 Flange terminal signal definition
Function
Signal
Signal description
