SN65HVD485EDGKR (transceiver)

 

A transceiver is a transmitter/receiver that exists in a single box. Whereas the phrase is most commonly associated with wireless communications equipment, it can also refer to transmitter/receiver devices in cable or optical fiber networks. This electrical device's primary function is to broadcast and receive various signals. The transceiver in radio communications can operate in half-duplex or full-duplex mode: half-duplex transceivers It can transmit or receive data, but not at the same instant. This is because the sender and receiver are linked to the same antenna through an electrical switch. This method is commonly used in ham radios, walkie-talkies, as well as other single-frequency Full-duplex transceivers. The radio transmitter and receiver can operate in tandem. Various radio frequencies are used for transmission and receiving. This mode may be found in both portable and cellular two-way radios. Full duplex is more efficient but the significance of both networks is dependent upon the Signal to noise ratio requirement and cost.SN65HVD485EDGKR is a half-duplex transceiver that ensures the efficient communication

The SN65HVD485E is a half-duplex transceiver for RS-485 data bus networks. Digital communications networks that meet the standard can be utilized efficiently over long distances and in electrically loud conditions. RS-485 is an industry specification that provides the electronics power supplies and physical layer for electrical device point-to-point communication.It is completely compatible with the TIA/EIA-485A standard and is powered by a 5-V supply. This device is designed to operate with a very low supply current, often less than 2 mm, but excluding the load, and is appropriate for data transfer up to 10 Mbps over long twisted-pair cables. The supply current falls below 1 mA while the device is in the inactive shutdown state.

The two parameters, EFT and surge transients, have a significant impact on quality assurance. EFT is an electrical fast transient referred to as a sudden burst of narrow high-frequency transients that can degrade the performance. While Surge transients are sudden overvoltage spikes that can affect circuit performance.To protect against EFT and surge transients that may occur in industrial applications, robust and dependable bus-node architecture frequently demands the inclusion of external transient-protection devices. Because these transients have such a broad frequency bandwidth (from about 3 MHz to 3 GHz), high-frequency layout approaches must be used during PCB design. Different precautions should be taken to avoid the aforementioned problems. The placement of the protective circuitry should be near the bus connector to keep noise transients out of the board.  VCC and ground planes should be used to distribute low-inductance power. High-frequency currents prefer to take the path with the least inductance rather than the path with the least resistance.Design should implement protective components in the signal path's direction. Transient currents should not be forced to deviate from the signal channel to reach the protective device.To reduce effectiveness via inductance, use at least two vias for the VCC and ground connections of bypass Mlcc capacitor and protective devices.

Limit noise currents in enable lines with 1-k to 10-k pull-up or pull-down resistors during transient occurrences.If the TVS clamping voltage is greater than the transceiver bus terminals' indicated maximum voltage, connect series pulse-proof resistors to the A and B bus lines. These resistors reduce the residual clamping current into the transceiver and prevent it from latching up.

This device's broad common-mode range and excellent ESD protection levels make it ideal for demanding applications such as electrical inverters,cabled chassis interconnects, status/command signals across telecom racks,and automated production systems where noise sensitivity is critical.