Overview
The ST485BDR is a low power RS-485/RS-422 transceiver manufactured by STMicroelectronics. It is designed for balanced data transmission and is compliant with both RS-485 and RS-422 standards. This transceiver is equipped to handle differential data transmission, ensuring reliability and robustness in various communication environments. It operates from a single 5 V supply and features a low quiescent current, making it highly adaptable and energy-efficient. The ST485BDR is housed in an SOIC-8 package and has an operational temperature range of -40°C to +85°C, making it suitable for industrial-grade applications.
Key Specifications
| Parameter | Value |
|---|---|
| Data Rate | 2.5 Mbps |
| Operating Temperature Range | -40°C to +85°C |
| Supply Voltage | 4.75 V to 5.25 V |
| Duplex | Half-Duplex |
| Function | Transceiver |
| No. of Drivers | 1 |
| No. of Receivers | 1 |
| Supply Current | 400 µA (max), 300 µA (typ.) |
| No of Terminals | 8 |
| Package Style | SOIC-8 |
| Mounting Method | Surface Mount |
Key Features
- Low quiescent current: 300 µA (typ.)
- Designed for RS-485 interface application
- -7 V to 12 V common mode input voltage range
- Driver maintains high impedance in 3-state or with the power OFF
- 70 mV typical input hysteresis
- 30 ns propagation delay, 5 ns skew
- Operates from a single 5 V supply
- Current limiting and thermal shutdown for driver overload protection
- Allows up to 64 transceivers on the bus
Applications
- Industrial Automation: Suitable for industrial communication networks, such as control bus systems and sensor interfacing, where reliable data transmission is critical.
- Telecommunications: Can be used in telecommunication infrastructures to aid in the transmission and reception of signals over long distances with minimal signal degradation.
- Renewable Energy: Can facilitate robust communication between components in solar inverters and wind turbine controllers, optimizing energy conversion and distribution.
- Communication and Networking: Can be incorporated into networking equipment, including routers and switches, to ensure reliable data transfer between network nodes.
Q & A
- What is the operating temperature range of the ST485BDR?
The operating temperature range of the ST485BDR is -40°C to +85°C.
- What is the supply voltage range for the ST485BDR?
The supply voltage range for the ST485BDR is 4.75 V to 5.25 V.
- How many drivers and receivers does the ST485BDR have?
The ST485BDR has one driver and one receiver.
- What is the maximum supply current of the ST485BDR?
The maximum supply current of the ST485BDR is 400 µA, with a typical value of 300 µA.
- What is the package style of the ST485BDR?
The ST485BDR is housed in an SOIC-8 package.
- What are the key features of the ST485BDR?
The key features include low quiescent current, compliance with RS-485 and RS-422 standards, current limiting, thermal shutdown, and high impedance in 3-state or with power OFF.
- What are some common applications of the ST485BDR?
Common applications include industrial automation, telecommunications, renewable energy, and communication and networking.
- How many transceivers can be connected on the bus?
Up to 64 transceivers can be connected on the bus.
- What is the propagation delay and skew of the ST485BDR?
The propagation delay is 30 ns, and the skew is 5 ns.
- Does the ST485BDR have thermal shutdown protection?
Yes, the ST485BDR has thermal shutdown circuitry for driver overload protection.
