SN65HVD485ED

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Interface - Drivers, Receivers, Transceivers

The SN65HVD485ED is an enhanced version of the popular SN75175 quad transceiver chip. It is designed primarily for applications where power consumption and EMI/RFI emission need to be kept to a minimum. The SN65HVD485ED is a low-power differential line transceiver, commonly used for RS-485 communications over long distances. It is capable of up to thirty-four thousandbps data rates, a twenty-four volt supply voltage, an operating temperature range of -40° to +70°C, and it is capable of transmitting data over distances of up to one kilometer.

Application Field

The SN65HVD485ED is commonly used in applications where long distance communication between two serial ports is required. This includes industrial and commercial data systems, such as point of sale systems, computer networking and automation systems. The SN65HVD485ED is specially designed for industrial environment, where the distance between devices is longer than the capability of the standard serial port, and the environment is likely to be particularly noisy. It is designed to combine a high speed data communications up to 34 thousand bps, low EMI/RFI emissions and low power consumption, which makes it well-suited for applications in an industrial environment.

Working Principle

The SN65HVD485ED contains two drivers and two receivers in a single package. The driver and receiver sections can be independently enabled or disabled, allowing for two-way communication. The two drivers are capable of driving two separate lines, one for sending data (TXD) and one for receiving data (RXD). The device also contains a transceiver enable (EN) pin, which can be toggled to prevent simultaneous transmission on the transmit and receive lines.

When the EN pin is enable, the drivers are enabled and the receivers are disabled. This allows the device to transmit data at the desired data rate. When the EN pin is disabled, the drivers are disabled and the receivers are enabled, allowing data to be received at the desired data rate. In this way, the SN65HVD485ED is able to provide simultaneous two-way communications over a long distance.

The SN65HVD485ED is designed to operate in both noisy and non-noisy environments. This is achieved by using differential line sensing, whereby any interference is cancelled out as the SN65HVD485ED uses a differential signal. If a signal is sent on one side of the wire, it is then sent back on the other side of the wire, to cancel out any interference. This means that the SN65HVD485ED can operate at long distances and still provide accurate data transmission.

The SN65HVD485ED is also designed to minimize power consumption. Data transmission is powered by a low power supply voltage, which reduces the overall power consumption of the device. The device is also designed to use automatic sleep mode and standby mode capabilities, which enable the device to enter a low power state when not in use, reducing power consumption even further.

In summary, the SN65HVD485ED is a low power differential line transceiver, designed for applications where long distance communication is needed. It is capable of high speed data transmission up to thirty-four thousandbps, a twenty-four volt supply voltage, an operating temperature range of -40° to +70°C and can transmit data up to one kilometer. It is designed for situations where interference and power consumption need to be kept to a minimum, making it an ideal choice for most industrial and commercial applications.

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