Intersil: compact and isolated RS-485 transceiver

Posted 3 March 2017

Intersil Corporation announced an isolated RS-485 differential bus transceiver in a 4mm x 5mm, 16-lead QSOP package designed to provide 4Mbps bidirectional data transmission for Industrial Internet of Things (IIoT) networks.

The ISL32704E is suited for the equipment-to-bus interface in IIoT networks that connect programmable logic controllers (PLCs) to instruments, robots, motor drives, data acquisition and digital I/O modules.

The transceiver leverages giant magnetoresistance (GMR) technology to provide galvanic isolation that keeps the communication bus free from common-mode noise generated in electrically noisy factory and building automation environments.

In addition, its GMR isolation does not require the elaborate encoding schemes found in capacitive and transformer-based isolators that use RF carriers or pulse-width modulation (PWM) to transfer DC and low frequency signals across the barrier.

On the non-isolated control-side, the ISL32704E supports direct connection to a 3V microcontroller while the isolated bus-side connects to a higher voltage 5V supply for communication of strong bus signals across 100 meters and longer distances.