Automotive applications looking for a controller-area network (CAN) transceiver can hitch a ride with AMI Semiconductor's AMIS-42700. This low cost, low-component-count device provides an interface between two physical CAN lines for in-vehicle networking (IVN) needs, but it has industrial uses as well.
CAN repeaters are used when standard buses in industrial applications have to cover longer physical distances. CAN also interconnects machines, process control units, and production subsystems in printing, textiles, and injection molding.
The CANH high-speed PHY-compatible (physical-layer) AMIS-42700 can provide a diagnostic access point to a bus without a separate microcontroller. This yields direct access for diagnostic tools at speeds of up to 1 Mbit/s. Using the repeater, the CAN line's impedance remains constant regardless of whether interfaces are connected or disconnected.
The AMIS-42700 can be used for 12- and 24-V systems. Each device comprises two differential line transceivers and a logic block that incorporates a repeater function and feedback suppression.
A thermal shutdown circuit provides electrostatic-discharge (ESD) protection up to ±8 kV. Electromagnetic emissions are low enough to eliminate the need for common-mode choke, thanks to very close matching of the output signals. A wide common-mode input voltage range results in low electromagnetic susceptibility.
The AMIS-42700 costs $1.61 each in quantities of 5000.