Isolated RS485 transceiver breaks ground loops
Mitchell Lee
Abstract
The LTC1535 isolated RS485 transceiver, which provides a one-chip solution for breaking ground loops and achieving a wide input range, is described.
Keywords
Isolated RS485 transceiver
ground loop
LTC1535
The RS485 interface standard is designed to handle a −7V to 12V input signal range; however, in practical systems, ground potentials vary widely from node to node, often exceeding the specified range. This can result in an interruption of communications, high current flow through ground loops or worse, destruction of a transceiver. Guarding against large ground-to-ground differentials calls for an isolated interface. A new surface mount device, the LTC1535 ...
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