STMicroelectronics' RS-485 Transceivers Combine Robust Signaling With Superior Speed for Cutting-edge Applications in Industrial Automation, Smart Buildings, and Robotics
STMicroelectronics' RS-485 Transceivers Combine Robust Signaling With Superior Speed for Cutting-edge Applications in Industrial Automation, Smart Buildings, and Robotics
STMicroelectronics has introduced the ST4E1240 RS-485 transceiver with 40Mbit/s speed, PROFIBUS-compatible output, and transient and hot-swap protection.
意法半導體推出了 ST4E1240 RS-485 收發器具有 40Mbit/s 的速度、兼容 Profibus 的輸出以及瞬態和熱插拔保護。
The ST4E1240 is the first in a new family of transceivers from ST featured to deliver robust and reliable RS-485 signaling for modern, performance-hungry industrial applications. The new transceivers support data speeds far above the original RS-485 standards and allow multipoint connections over extended cable runs with more than 64 transceivers on the bus. Typical uses are in programmable logic controllers (PLCs), robots, telecom infrastructures, smart-building controls, servo drives, optical networking devices, grid infrastructure, data-acquisition systems including smart meters, and backplane buses.
ST4E1240 是意法半導體新收發器系列中的第一款，旨在爲性能要求高的現代工業應用提供堅固可靠的 RS-485 信號。新的收發器支持的數據速度遠高於最初的 RS-485 標準，並允許通過延長電纜進行多點連接，總線上有超過 64 個收發器。典型用途是可編程邏輯控制器 (PLC)、機器人、電信基礎設施、智能建築控制、伺服驅動器、光網絡設備、電網基礎設施、包括智能電錶在內的數據採集系統和背板總線。
The protection built into the ST4E1240 meets IEC 61000-4-2 up to +/-12kV contact discharge, allowing the devices to be used without external ESD protection. There is also class-A fast-transient protection up to +/- 4kV, meeting IEC 61000-4-4, ensuring data integrity and bus stability. Hot-swap circuitry prevents unwanted states on the bus during device switch-on or plug-in and is capable of discharging up to 100pF parasitic capacitance. Furthermore, the transceiver integrates failsafe protection that drives the output high to avoid an indeterminate state upon detecting an open, shorted, or idle bus. Other features include 250mA short-circuit protection and thermal shutdown.
ST4E1240 內置的保護符合 IEC 61000-4-2，最高可達 +/-12kV 的接觸放電，允許設備在沒有外部 ESD 保護的情況下使用。還有高達 +/-4kV 的 A 級快速瞬態保護，符合 IEC 61000-4-4 標準，確保數據完整性和總線穩定性。熱插拔電路可防止設備開啓或插入期間總線出現不想要的狀態，並且能夠放電高達 100pF 的寄生電容。此外，該收發器還集成了故障安全保護，可將輸出驅動到高電平，以避免在檢測到總線開路、短路或空閒時出現不確定狀態。其他功能包括 250mA 短路保護和過熱停機。
The ST4E1240 fulfils all TIA/EIA-485 (RS-485) standards and ensures the output differential voltage exceeds 2.1V, at 5V supply, for compatibility with the popular PROFIBUS field bus standard. There is also a shutdown mode, controlled with external enable pins, that reduces the quiescent current below 3.5μA for use in energy-conscious applications.
ST4E1240 符合所有 TIA/EIA-485 (RS-485) 標準，並確保在 5V 電源下輸出差分電壓超過 2.1V，以兼容流行的 PROFIBUS 現場總線標準。還有一種由外部使能引腳控制的停機模式，可將靜態電流降至3.5μA以下，適用於節能型應用。
The ST4E1240 RS-485 transceiver is part of ST's 10-year longevity program that ensures long-term product support. The devices are in production now and available in the SO-8 4.9mm x 3.91mm package, from $0.81 for orders of 1000 pieces. Free samples are available from the ST eStore.
For more information, please visit www.st.com/en/interfaces-and-transceivers/st4e1240.html.
欲了解更多信息，請訪問 www.st.com/en/接口和收發器/st4e1240.html。
譯文內容由第三人軟體翻譯。