The CRep N 2-channel CAN Bus repeater transmits and amplifies CAN signals transparent 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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CRepN 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)|
When a CRep N repeater is used, the effect of the propagation delay through the repeater must be included in the cable length calculation.
For a CRep N repeater, the typical and maximum propagation delays is 100ns and 175ns, 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 32m.
CRep N devices include 2 CAN segments, wired by a terminal block with 8 clamps. Besides the CAN signals the terminal block also carries the power supply for CRep N. The following table shows the terminal assignment.
|1||CAN1_H||CAN bus line circuit 1 (dominant high)|
|2||CAN1_L||CAN bus line circuit 1 (dominant low)|
|5||CAN2_H||CAN bus line circuit 2 (dominant high)|
|6||CAN2_L||CAN bus line circuit 2 (dominant low)|
|8||+24V||Power supply +24V|
|Voltage on bus connections||-30||+30||V|
|Maximum power consumption (at 60°C)||-||1000||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.
|Current consumption (running idle)||-||25||-||mA|
|Current consumption (250kBaud, 100% busload)||-||35||-||mA|
All values, unless otherwise specified, refer to a supply voltage of 24V and an environmental temperature of 20°C.