ISL31472EIBZ-T7A

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The ISL31472EIBZ-T7A device is a highly integrated, single-channel transceiver solution for RS-485 systems. Designed for applications in industrial environments including industrial automation, factory automation, machine control, and building automation, it combines a high RF Immunity low-power transceiver chip, large regulator, small signal buffering, and a wide operating temperature range in an industry standard footprint. This article will discuss the application field and working principle of the ISL31472EIBZ-T7A.

Application Fields

The ISL31472EIBZ-T7A is ideal for implementing robust, low power, and error-free communications in industrial control systems and other applications that require accurate timing and reliable communication over long distances. It is particularly suitable for applications where cable lengths exceed 1,200m and multiple nodes of RS-485 communication systems are involved. It is also effective for applications requiring side-by-side communication networks with limited propagation delays, such as Profibus and other network faster communication protocols, or for two-wire half-duplex communication such as Ethernet/IP. In addition, it is suitable for distributed control systems in harsh environments that require high EMI protection and long distance transmission due to the built-in EMI protection circuitry.

Features

The ISL31472EIBZ-T7A features +10 dBm output power, +15 dBm output power when using voltage regulation, built-in EMI protection, simplified fault detection and recovery, low propagation delay, better Common mode noise tolerance, and protection on transmit/receive pins. It has open-circuit protection, output disable, and receiver enable with Schmitt trigger circuitry. It also provides a low power sleep mode, power up time of only 250 ns, and a fast recovery time of 25.6us.

Working Principle

The working principle of ISL31472EIBZ-T7A is based on RS-485 protocol. RS-485 is a two-wire, half-duplex, differential-signaling protocol used for data communication. It enables up to 32 devices to be interconnected on a single signal line, with the signal data being transmitted as a differential voltage. The transmit signal is encoded by a voltage inversion of the differential data sent over two-wire cables. The signal then travels along two wires: one for the positive logic signals and one for the negative logic signals. The receiver decodes the transmit signal by comparing the voltages on the two wires. The main advantage of differential signaling is the ability to cancel any noise picked up by the cables. Since the noise affects both lines equally, the receiver can distinguish between the actual signals and the noise. It also provides a reliable way to transmit data over long distances and harsh environments.

The ISL31472EIBZ-T7A transceiver uses the MAX307L low-power RS-485 transceiver chip. This chip is capable of providing +10 dBm of transmit power and is suitable for long-range communication applications. Moreover, its built-in EMI protection provides further protection against noise and electromagnetic interference. The chip also features an on-chip voltage regulator, which allows it to operate with a wide range of input voltages without the need for an external regulator. Additionally, it incorporates a Schmitt trigger circuitry, which provides improved fault detection and recovery.

Conclusion

The ISL31472EIBZ-T7A is a highly integrated transceiver solution for RS-485 systems. It is ideal for a wide range of industrial applications and offers robust, low power and error-free communications. Its key features include +10 dBm output power, EMI protection, simplified fault detection and recovery, low propagation delay, better Common mode noise tolerance, and protection on transmit/receive pins. Its working principle is based on the RS-485 protocol, which provides reliable data transmission over long distances and harsh environments.

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