Linear Technology’s new LTC2872 is a multiprotocol transceiver with switchable integrated termination for 3,3 V and 5 V systems.
RS485 systems require a termination resistor on the ends of the communication bus to minimise signal reflections. The LTC2872 integrates pin-controlled termination resistors for easy interface reconfiguration, eliminating external resistors and control relays. The termination resistors, when enabled, are automatically switched in or out to match the transceiver’s protocol selection of RS232 or RS485.
The device features high ESD protection: ±16 kV HBM on the transceiver bus pins, when powered off or operating. The IC can be configured as four RS232 single-ended transceivers or two RS485 differential transceivers, or combinations of both, on shared I/O lines, reducing component count for multiprotocol networks and offering on-the-fly configurability.
The LTC2872 is suitable for a wide range of applications, including software-selectable multiprotocol interface ports, point-of-sale terminals, security cameras, cable repeaters and protocol translators. An optional 1,7 V to 5,5 V logic supply enables convenient digital interfacing, and an integrated DC/DC boost converter eliminates the need for multiple supplies to drive RS232 levels.
Drivers and receivers are independently disabled, leaving them in a high impedance state, consuming only 9 μA in a low power shutdown mode. Aside from automatic termination selection, the IC provides half- and full-duplex RS485 switching and a logic loopback mode that steers the driver inputs to the receiver outputs for diagnostic self-test and debug.
Other protective measures include high ESD of ±4 kV or better on all pins, thermal shutdown protection and a full failsafe RS485 receiver for floating, shorted or terminated inputs that eliminates the need for external network biasing resistors and UART lockup.
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