SP485ECN-L

Product Overview

• Category: Integrated Circuit
• Use: Communication and Networking
• Characteristics: High-speed, low-power, half-duplex RS-485/RS-422 transceiver
• Package: 8-pin SOIC (Small Outline Integrated Circuit)
• Essence: Enables reliable long-distance data communication in industrial applications
• Packaging/Quantity: Tape and Reel, 2500 units per reel

Specifications

• Supply Voltage: 3.0V to 5.5V
• Data Rate: Up to 10 Mbps
• Operating Temperature Range: -40°C to +85°C
• Number of Drivers/Receivers: 1 Driver, 1 Receiver
• Driver Output: ±60V
• Receiver Input: ±12V
• Driver Output Resistance: 13Ω
• Receiver Input Resistance: 12kΩ
• Shutdown Current: 1μA (max)

Pin Configuration

The SP485ECN-L has the following pin configuration:

1. DE (Driver Enable)
2. /RE (Receiver Enable)
3. A (Non-Inverting Data Line)
4. B (Inverting Data Line)
5. GND (Ground)
6. Y (Receiver Output)
7. Z (Driver Output)
8. VCC (Power Supply)

Functional Features

• Half-duplex communication using differential signaling
• Enhanced ESD protection for robust operation in harsh environments
• Low power consumption for energy-efficient designs
• Wide supply voltage range for compatibility with various systems
• Thermal shutdown protection to prevent damage due to overheating
• Receiver input hysteresis for improved noise immunity

Advantages

• High-speed data transmission up to 10 Mbps
• Reliable long-distance communication up to 1200 meters
• Suitable for industrial applications with noisy environments
• Low power consumption extends battery life in portable devices
• Easy integration into existing RS-485/RS-422 networks

Disadvantages

• Limited to half-duplex communication only
• Requires external components for complete system implementation
• Sensitive to improper termination and noise on the communication lines

Working Principles

The SP485ECN-L is a half-duplex transceiver that uses differential signaling to transmit and receive data. It converts the logic-level signals from the microcontroller into balanced voltage levels suitable for long-distance communication over twisted-pair cables. The driver amplifies the transmitted signal, while the receiver detects and amplifies the received signal. The DE and /RE pins control the direction of data flow.

Application Field Plans

The SP485ECN-L is widely used in various industrial applications, including:

1. Factory Automation: Enables reliable communication between PLCs, sensors, and actuators in automated manufacturing systems.
2. Building Automation: Facilitates data exchange between HVAC systems, lighting controls, and access control devices.
3. Process Control: Ensures seamless communication between control systems and field instruments in oil refineries, chemical plants, etc.
4. Renewable Energy Systems: Enables monitoring and control of solar inverters, wind turbines, and energy storage systems.
5. Transportation Systems: Facilitates communication in railway signaling, traffic management, and vehicle tracking systems.

Alternative Models

• MAX485: Similar functionality and pin configuration, manufactured by Maxim Integrated.
• SN75176: Compatible RS-485 transceiver, produced by Texas Instruments.
• LTC1480: Low-power RS-485 transceiver, available from Linear Technology.

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