SN65HVD1794P

Series:	--
Packaging:	Tube
Part Status:	Active
Type:	Transceiver
Protocol:	RS422, RS485
Number of Drivers/Receivers:	1/1
Duplex:	Half
Receiver Hysteresis:	50mV
Data Rate:	115Kbps
Voltage - Supply:	4.5 V ~ 5.5 V
Operating Temperature:	-40°C ~ 105°C
Mounting Type:	Through Hole
Package / Case:	8-DIP (0.300", 7.62mm)
Supplier Device Package:	8-PDIP
Base Part Number:	SN65HVD1794

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Introduction

The SN65HVD1794P is a high-performance, dual-channel transmitter and receiver, designed to bridge data communications between isolated industrial RS-485 bus systems. It is one of a range of products within the Texas Instruments (TI) Optically Isolated RS-485 Communication Interface family. The device provides an interface Buffer, bidirectional data flow control, failsafe and Zener isolation, protection against ground potential differences, and optical and electromechanical isolation. Additionally, the surface mountable package and ESD immunity of this device make it suitable for harsh, rugged industrial environments.

Applications

The SN65HVD1794P is suitable for a wide range of industrial applications such as process control, factory automation, tunnel applications, wind power systems, lighting systems, and other areas requiring great reliability and long-distance communication. It can also be used in non-RS-485 compliant systems, such as industrial buses with low-speed, differential signaling.Its wide industrial applications make the SN65HVD1794P an ideal choice for a range of field-bus applications, including automation and factory applications. Its highly robust functional safety and insulation protection protects against transient interference, along with data isolation and EMI isolation between the host system and the field bus.

Working Principle

The SN65HVD1794P works by providing a complete, optically isolated, bidirectional RS-485 communication interface. At the heart of the device is an optically coupled air-gap communication interface, which provides an isolated signal path between the two channels it connects. The two channels are connected by a pair of optocouplers, which drive the sending and receiving functions, thus enabling the signal to transfer across the two channels without any interference. Additionally, the SN65HVD1794P features Zener isolation, protection against ground potential differences, low-power consumption, support for data-rates up to 1.5Mbit/s and robust EMI immunity. The device integrates two MOSFETs, which are used to control the data flow between two channels respectively. The two MOSFETs also work together to provide a failsafe state in case of a power failure. The failsafe state would prevent any data being sent or received due to the voltage drop of the MOSFETS, providing an extra layer of protection to the system. In addition, the SN65HVD1794P includes an internal ESD-clamp which provides an extra layer of protection to the system against transient interference. Moreover, the device is available in a BGA package and comes with an integrated EMI filter which further improves the system robustness and immunity. The SN65HVD1794P is easy to use, and its wide signal range, low power consumption and cost-effectiveness make it an ideal choice for designing for industrial communication interface solutions.

Conclusion

The SN65HVD1794P is an ideal choice for industrial communication interface solutions, thanks to its wide signal range, low power consumption and cost effectiveness. The device provides an optically isolated bidirectional RS-485 communication interface, featuring Zener isolation, protection against ground potential differences and robust EMI. Additionally, the device features two MOSFETS which provide a failsafe state in case of power failure and an integrated ESD protection to protect against transient interference. Moreover, the SN65HVD1794P can be integrated into a wide range of industrial and field-bus applications, including automation, factory applications and tunnel applications.

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