Isolated CAN transceiver

25 January 2012 Telecoms, Datacoms, Wireless, IoT

Analog Devices has expanded its isolated interface product portfolio with the first signal-only isolated CAN (controller area network) transceiver to provide an isolation rating to 5 kVrms with 125°C operation. The fully certified ADM3054 offers isolated power-detect functionality in a highly integrated, single-surface-mount package capable of operating in harsh industrial applications.

The device leverages Analog Devices’ iCoupler digital isolator technology and combines a 3-channel digital isolator with a CAN transceiver in a 10 x 10 mm 16-lead, wide-body SOIC (small-outline IC) package. The ADM3054 is targeted at applications where an isolated power rail already exists or an additional overwind from an existing isolation transformer can be used. Its logic is powered with a single 3,3 V or 5 V supply while the bus side uses a single 5 V supply.

Loss of power on the bus side can be detected by the microcontroller using an integrated sense signal. The transceiver has integrated ±36 V fault protection on the bus pins to guard against shorts to power/ground in 12 V and 24 V systems. The device also has current limiting and thermal shutdown features that protect against output short circuits and situations where the bus might be shorted to ground or power terminals.

The ADM3054 creates an isolated interface between the CAN protocol controller and the physical layer bus. It is capable of running at data rates of up to 1 Mbps and is fully specified over the industrial temperature range of 40°C to +125°C.

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