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Transceiver acts as low-cost, low component count CAN repeater

Posted: 20 Jul 2005 ?? ?Print Version ?Bookmark and Share

Keywords:ami semiconductor? amis? amis-42700? can transceiver ic? transceiver?

Can be used for 12V and 24V systemsAMI Semiconductor (AMIS), a designer and manufacturer of integrated mixed-signal and structured digital products, announced that it has started sampling its ISO 11898-2 compatible AMIS-42700 CAN transceiver IC that provides the interface between two physical CAN lines, allowing the device to act as a low-cost and low component count CAN repeater. Can be used for both 12V and 24V systems, this dual high-speed transceiver provides a single chip repeater solution for interfacing between up to two physical bus lines and the protocol controller in high-speed controller areas networks (CANH).

The AMIS-42700 addresses the needs of CANH busses for in-vehicle networking (IVN). Automotive applications for CANH include control of engine management units and body electronics such as power windows, air conditioning and vehicle lighting.

The new transceiver can also be used to provide a diagnostic access point to a CANH bus without the need for a separate microcontroller. According to the company, this results in direct access for diagnostic tools at speeds of up to 1Mbps. Using the repeater, the impedance of the CAN line remains constant regardless of whether interfaces are connected or disconnected. The AMIS-42700 can also be used to provide a cost-effective way of extending the physical length of a CAN bus, which is useful in many industrial applications such as elevators.

AMIS added that it used its advanced I2T mixed-signal semiconductor technology to integrate a high level of functionality into a single compact IC. The devices comprise two differential line transceivers and a logic block that incorporates a repeater function and feedback suppression. Protection is provided by a thermal shutdown circuit and electrostatic discharge (ESD) protection up to 8KV.

Housed in a compact "green" SOIC 300 20-pin package, the AMIS-42700 operates with very low electromagnetic emission (EME) due to the very close matching of the output signals. This means a common-mode choke is not required, explained the company. In addition, the wide common-mode voltage range of the receiver inputs allows the transceiver to offer very low electromagnetic susceptibility (EMS).

The AMIS-42700 is priced at $1.61 each in quantities of 5,000 units.

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