1. Overview
Figure 1:
Block circuit diagram of CAN-Repeater-Y-Opto
The CAN-Repeater-I can be used to increase the number of connected devices of the CAN net, or
to add an electrical isolation (only with ‘-Opto’ design). The CAN-Repeater-Y branches from one to
two CAN lines.
All CAN interfaces of the repeaters are in accordance with ISO 11898. Each repeater is available
without electrical isolation or with an electrically isolated CAN 1 interface.
The maximum transmission rate is 1 Mbit/s. The bit timing has to be the same for all connections.
Each CAN interface has a terminating impedance of 120 Ω in the repeater.
The total extension and therefore the maximum bit rate of the complex CAN network is determined
by the sum of the maximum lengths of subnetworks and the reduction of the total line length by
inserting the repeater. Only one CAN-Repeater should be used per network.
The CAN-Repeater is supplied by an external voltage in the range of 8 V...30 V.
The integrated quick logic guarantees a total transparency and the perfect arbitration of CAN
objects in all networks connected.
Page 8 of 28
Hardware Manual • Doc. No.: C.1330.21 / Rev. 1.4
CAN-Repeater
I
CAN 1_H
Physical
CAN
Layer
VCC (24V/DC)
GND 1
DC
DC
GND
(= GND2,
GND3)
120Ohm
CAN 1_L
CAN 2_H
GND 2
CAN 2_L
P1B
P3
P4A,
P4B
Physical
CAN
Layer
CAN 3_H
Physical
CAN
Layer
GND 3
CAN 3_L
P2
Arbiter
CAN 2
CAN 3
CAN 1
120Ohm
120Ohm
Y
Electrical Isolation
Voltage
controller
U
E
G
M
-
S
cr
ew
C
on
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ct
or
D
S
U
B
9
fro
nt
D
S
U
B
9
up
pe
r
D
S
U
B
9
up
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r
