SP3222ECA-L/TR

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Interface - Drivers, Receivers, Transceivers is a essential component for electronic communication and communication protocol in web world. SP3222ECA-L/TR, as a transceiver controller, also plays an important role in modern technology. This article will explain the application fields and working principles of SP3222ECA-L/TR.

Application Field

SP3222ECA-L/TR is a full-duplex RS-485/422 transceiver designed for communication over shielded twisted-pair cables. Besides, it provides ESD protection of up to ±15kV Human Body Model (HBM). SP3222ECA-L/TR has a wide range of applications in the field of industrial communication. It is widely used for the transmission of serial data in applications such as industrial automation, system control, point-of-sale, process control and many more.

Features

SP3222ECA-L/TR can communicate up to 100m(250Kbps) and 400m(12Mbps)on shielded twisted pair cables for RS-485/RS-422 communications. In order to minimize power consumption, this transceiver integrates low power shutdown modes with a power-down detect circuitry. Besides, Wake up function is also supported by this transceiver. It can operate at very low power consumption by reducing reduction the supply current less than 3 μA. Besides, SP3222ECA-L/TR achieves superior protection of up to ±15kV Human Body Model (HBM) and ±15kV IEC 61000-4-2 Contact Discharge ESD protection.

Working Principle

SP3222ECA-L/TR transmits serial data in both directions over twisted-pair cables. It has two different configurations, one is separate RS-485/422 transceiver, the other one is combination of both products. The basic principle of RS-485/422 transceiver is the same, but for RS-485, the current output always uses the differential signal to reduce the ground bounce noise and reduce the interference of the signal. In addition, for RS-422, it also uses the differential signal, but with a wider transmission distance, which reaches up to 400m.

SP3222ECA-L/TR has two pins, DE and RE, used to enable the differential driver and receiver. The DE read pin reads the state of the differential driver and the RE write pin enables the differential receive. If both the DE and RE are active, then the transceiver is in full-duplex mode, which allows data to be transmitted in both directions. The differential transmit and receive between DE and RE is enabled by the internal circuit of the transceiver.

In addition, SP3222ECA-L/TRhas an internal charge pump voltage regulator circuit that can provide up to 7V. Under no load conditions, 7V is applied to the EN pin and the transmit signal is stronger than that of the normal 5V power supply. This can help to reduce signal attenuation and reduce data corruption. In order to save power, the charge pump regulator circuit will be disabled when the DE and RE pins are inactive for a certain period of time, thus reducing the power consumption of the device.

Conclusion

In conclusion, SP3222ECA-L/TR is a full-duplex RS-485/422 transceiver, which is widely used for communication over shielded twisted-pair cables. Its features include low power shutdown, Wake up function and ESD protection. In addition, its ability to support low power consumption and long transmission distance makes it a great choice for industrial communication.

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