LCSC supplier HGSEMI has launched a series of RS-485 interface IC products. This article will introduce HGSEMI’s RS-485 interface IC product, the HG3085E.
Overview
The HG3085E, designed for RS-485/RS-422 communication, is a high-speed transceiver that operates in half-duplex mode, featuring one driver and one receiver. It incorporates a fail-safe circuit that ensures a high logic level at the receiver input, even when the input is open-circuited or short-circuited. If all transmitters connected to the terminal-matched bus are disabled (high impedance), the receiver will output a high logic level.
The HG3085E is equipped with a low slew rate driver that helps to reduce electromagnetic interference (EMI) and reflections caused by improper terminal matching cables. This feature enables the device to achieve error-free data transmission at rates up to 500Kbps. Additionally, the receiver of the HG3085E has an input impedance of 1/8 unit load, allowing for the connection of more than 256 transceivers on the bus. The HG3085E is a complete substitute for the MAX3085E.
Comparison of Parameters Between HG3085 and MAX3085
| Parameters | HG3085 | MAX3085 | XX485 | XXX485 |
| ESD | ±20KV | ±15KV | ±15KV | ±8KV |
| Receiver input impedance | 96KΩ | 96KΩ | 12KΩ | 20KΩ |
| Bus
load count |
256 | 256 | 32 | 32 |
| Common-mode
input range |
-7V-12V | -7V-12V | 0V-5V | 0V-12V |
| Circuit
shut-off function |
Yes | Yes | No | No |
| Receiver threshold | -200mV-50mV | -200mV-50mV | -200mV-200mV | -200mV-200mV |
| Fail-safe function | Yes | Yes | No | No |
| Hot-swapping capability | Yes | No | No | No |
| Manufacturing process | BCD 25V | BCD 25V | CMOS 5V | BCD 15V |
Key Features
- Comprehensive fault protection for the receiver, ensuring high logic levels under various fault conditions in RS-485 communication
- Powerful slew rate control that contributes to error-free data transmission, ideal for RS-485 applications
- An ultra-low 1nA current shutdown mode that conserves power in standby situations
- The ability to connect over 256 transceivers on the bus, enhancing scalability in RS-485 networks
- SOP-8 and DIP-8 packages, offering flexibility in design and integration
Technical Specifications
- Voltage input range: -8V to 13V, accommodating a wide range of power supply options
- ESD protection: ±15KV, safeguarding the device against electrostatic discharge, a common issue in RS-485 communication environments
- Operating temperature: -40°C to 85°C, ensuring reliable operation in diverse climates and conditions
Application Fields
- Industrial control systems, where RS-485 communication serves for reliable and long-distance data transmission
- Access control and security systems, benefit from the stable and error-free communication provided by the HG3085E over RS-485
- Instrumentation, where precision and reliability are paramount, and RS-485 is a preferred communication protocol
- Level conversion, where the HG3085E’s RS-485 capabilities can serve to interface with different voltage levels
- Applications sensitive to EMI, where the device’s low slew rate driver and fault protection features are particularly advantageous
Conclusion
The HG3085E is a versatile, high-performance transceiver that excels in RS-485 communication applications. Its combination of fault protection, low slew rate, scalability, and robust design make it an indispensable component for systems that demand reliable and high-speed data transmission. Whether in industrial control, security systems, or any application that requires the stability and reliability of RS-485, the HG3085E delivers high performance in the most demanding environments.
LCSC is a global electronic component distributor, aggregating more than 2600 brand suppliers and 560,000 ready-to-ship SKUs. With over 130,000 square meters of intelligent warehousing, LCSC boasts more than 4.6 million registered users worldwide and an average of over 16,000 orders per working day. Shop for RS-485 interface ICs from HGSEMI and other products on LCSC.
