TI Intros RS-485 Transceiver Targeted for E-Metering and Industrial Applications
Texas Instruments, Inc. (TI) today introduced a low-power, half-duplex RS-485 transceiver with the fastest automatic bus-polarity correction time. In many industrial applications, such as e-metering networks, DMX512 networks, industrial automation, HVAC systems and process control, it is easy to connect wires incorrectly, which can cause system failure. For large networks, miss-wiring without quick correction can cause production delays, resulting in significant revenue loss. When hot-plugged, the SN65HVD888 provides cross-wire immunity 80 percent faster than previously-announced devices, detecting and correcting the bus polarity within 76 milliseconds of bus idling.
The SN65HVD888 is available in a standard 8-pin SOIC package, which eliminates the need for board redesign while providing a robust, reliable upgrade to a standard RS-485 device. In addition, the SN65HVD888 supports up to 256 nodes on the bus, eliminating the need for repeaters.
Key features and benefits of the SN65HVD888 include: Better electrostatic discharge (ESD)/electrical fast transients (EFT) performance: At +/-12 kV IEC61000-4-2 contact discharge and +4 kV IEC61000-4-4 fast transient burst, it is more reliable than competing devices in noisy environments. Highest transient immunity: Large receiver hysteresis at 60 mV is 15-percent higher than the nearest competitor, providing better immunity to noise on the bus lines. Fastest correction time: Correcting polarity 80 percent faster than the closest competing device ensures the system is functioning properly in the shortest possible time. And lowest power consumption: An optimized combination of low quiescent and standby supply currents makes the device suitable for battery-powered applications.
The RS-485 half-duplex evaluation module is available to evaluate device performance, to support fast development and analysis of data transmission systems using the SN65HVD888. It can be ordered today for US$49. The SN65HVD888 is available in a standard 8-pin SOIC package. Suggested retail pricing in 1,000-unit quantities starts at US$1.10.
