The SP487ET is a half-duplex RS-485 transceiver manufactured by Sipex Corporation, which is now part of Exar Corporation and later acquired by Rohm Semiconductor. It is designed for robust communication in noisy industrial environments. This transceiver integrates the transmit and receive functions into a single chip, simplifying the design of RS-485 networks.

Applications

• Industrial automation: Communication between PLCs, sensors, and actuators.
• Motor control: Data transmission in motor drive systems.
• Building automation: Control and monitoring of HVAC systems, lighting, and security systems.
• Point-of-sale (POS) systems: Data communication between terminals and peripherals.
• Remote monitoring: Data acquisition and control in remote locations.

Features

• Half-duplex RS-485 transceiver: Integrated transmit and receive functions.
• Single 5V supply: Operates from a single 5V power supply.
• Low power consumption: Minimizes energy usage in battery-powered applications.
• High noise immunity: Provides reliable communication in noisy environments.
• Thermal shutdown protection: Protects the device from overheating.
• Short-circuit protection: Protects the transceiver from damage due to short circuits.

Benefits

• Reliable communication: High noise immunity ensures data integrity in harsh environments.
• Simplified system design: Integrated transceiver reduces component count and board space.
• Reduced power consumption: Low power operation extends battery life in portable devices.
• Enhanced system protection: Thermal shutdown and short-circuit protection prevent device failure.
• Cost-effective solution: Provides a robust communication interface at a competitive price.

Additional Details

The SP487ET features a data rate of up to 10 Mbps and a common-mode voltage range of -7V to +12V. It typically includes slew-rate limiting to minimize EMI (Electromagnetic Interference). The device is available in various packages, including SOIC and DIP. Proper termination is crucial for reliable RS-485 communication, and the datasheet provides guidelines on selecting appropriate termination resistors. The SP487ET is designed to meet the TIA/EIA-485 standard.