ST485BD

Series:	--
Packaging:	Tape & Reel (TR)
Part Status:	Obsolete
Type:	Transceiver
Protocol:	RS422, RS485
Number of Drivers/Receivers:	1/1
Duplex:	Half
Receiver Hysteresis:	70mV
Data Rate:	2.5Mbps
Voltage - Supply:	4.75 V ~ 5.25 V
Operating Temperature:	-40°C ~ 85°C
Mounting Type:	Surface Mount
Package / Case:	8-SOIC (0.154", 3.90mm Width)
Supplier Device Package:	8-SO
Base Part Number:	ST485

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ST485BD application field and working principle

ST485BD is an integrated circuit made by ST Company, which is an RS-485 transceiver class. This device has two drivers and two receivers with unipolar drivers, so it can provide better performance in different electrical environments. Moreover, it is designed to provide true bidirectional data transmission and it is used in most international protocols, like the IEEE-1394 and the Industrial Automation Protocol. Thus, ST485BD is widely used in fields such as industrial automation and data acquisition systems. The main purpose of ST485BD is to provide a low-cost, yet reliable way of data transmission utilizing the RS-485 standards. The integrated device provides a means of increasing data communication speed and range in a number of industrial applications, such as sensor monitoring, microprocessor communication, security systems, automotive, and medical equipment. It also provides the advantages of using an electrically balanced communication interface for the robust transmission of data over standard unshielded twisted pair (UTP) or shielded twisted pair (STP) cables. The device can also be used in a multi-device environment, such as when two or more units are connected together, each operating as its own node.The ST485BD is designed as a 2-port Transceiver with two transmit and two receive pairs. It provides a two-way data flow at a up to 20 Mb/s data rate. It provides high-speed data transmission with galvanic isolation between the driver and receiver blocks. Additionally, ST485BD’s UTP interface has low EMI/RFI emission and high reliability, making it an ideal solution for harsh industrial environment.As for the working principle of ST485BD, it is based on the H-bridge circuit module, which enables the bi-directional data transfer over the RS-485 bus. The device contains two complementary pairs of H-bridge type transistors, one pair for the receive block and one pair for the transmit block. The H-bridge circuit allows the device to have high noise immunity by providing bidirectional switching ability. The transmitting data can be transmitted independently from the received data between the transmitter and receiver.When the device is in receive mode, the ST485BD receives data from the RS-485 bus and converts it to a digital format. This data is then forwarded to the receiving device. In transmit mode, the device converts the digital data to an analog signal and transmits it on the RS-485 bus. The device also has thermal protection that allows the device to shut down in case of any over-temperature situation. This helps to maintain the integrity of the data and the system itself.The ST485BD is capable of providing quiet, reliable, and low cost data transmission over standard UTP cables. With its low EMI/RFI emission and high reliability, the device is suitable for use in harsh industrial environments. Furthermore, it is capable of handling standard unipolar single-ended interfaces up to 20 Mb/s data rate. Therefore, the device is a preferred choice for many industrial applications that require low-cost and easy-to-use data transmission solutions.

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