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Isolated CAN Bus Repeater with Optical Isolation

CRep Opto

The CRep Opto two-channel isolated CAN Bus repeater transmits and amplifies CAN signals using optical isolation, transparently to the CAN protocol. CRep N allows the design of flexible wiring topologies, with star and tree structures and stub lines easily realized.

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CRep Opto User Manual (pdf)

Key Product Features

  • Protocol transparent 2-channel CAN repeater
  • Galvanic separation of CAN segments (CAN1 & CAN2)
  • Single or Dual Power Supply configuration
    • Single: delivers power from one network side (CAN1)

    • Dual: delivers power from both galvanically isolated network sides (CAN1 & CAN2)
  • Low Propagation Delay
  • Extended Error Suppression
  • Choice of Baud Rate: 10/20/50/125/250/500kBaud (selected at order time via factory set inhibit time)
  • Rail Mountable
  • FCC Class A Verified (use restricted to commercial, business, and industrial environments)

CPC-USB/ARM7 USB to CAN Bus Interface


Baud Rate Settings & Overall Cable Length Restrictions

CRep Opto repeaters are available in a number of baud rate configurations. The maximum CAN cable length, which is the distance between the furthest two nodes in the network, is related to the operating baud rate as follows:

Baud Rate Maximum Cable Length (m)
1Mbit/s 25
800kbit/s 50
500kbit/s 100
250kbit/s 250
125kbit/s 500
50kbit/s 1000

When a CRep Opto repeater is used, the effect of the propagation delay through the repeater must be included in the cable length calculation.

For a CRep Opto repeater, the typical and maximum propagation delays is 125ns and 200ns, respectively. Assuming a 5.5ns/m propagation delay for cable, the maximum propagation delay through the CRep N repeater is equivalent to a cable length of roughly 36m.

Technical Data

Layout and Connection

CRep Opto devices include 2 CAN segments fed to a male and a female plug of type D-Sub 9. The plugs carry the CAN signals and the supply voltage. The following table shows the function of the internally connected CAN interface.

Pin Name Function
2 CAN_L CAN bus line (dominant low)
3 GND Ground line
7 CAN_H CAN bus line (dominant high)
9 Vcc Power supply +24V

Limiting Values

Parameter Minimal Maximal Unit
Storage temperature -20 +80 °C
Operating temperature 0 +60 °C
Supply voltage -100 +35 V
Voltage on bus connections -30 +30 V
Maximum power consumption (at 60°C) - 2000 mW

Any (also temporary) stress in excess of the limiting values may cause permanent damage on CRep N and other connected devices. Exposure to limiting conditions for extended periods may affect the reliability and shorten the life cycle of the device.

Nominal Values

Parameter Minimal Typical Maximal Unit
Current consumption (running idle) - 30 - mA
Current consumption (250kBaud, 100% busload) - 40 - mA
Supply voltage 10 24 30 V
Propagation delay - 125 200 ns

All values, unless otherwise specified, refer to a supply voltage of 24V and an environmental temperature of 20°C.