MC34CM0902WEF

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MC34CM0902WEF is an integrated mixed-signal device containing one RS-485 transceiver and one line receiver, which provide full-duplex communication capability in data-comm applications. The device meets the requirements of the TIA/EIA-485 communication standard and is also compatible with RS-423 and RS-422 communication systems. The MC34CM0902WEF device is specially designed for industrial applications, such as industrial automation, lighting control, and smart meters.

Application Field

The MC34CM0902WEF device is specifically designed for industrial applications. It is suitable for high-speed data communication and data transmission, as well as data access control. Additionally, the device supports half-duplex and full-duplex operations and is capable of communicating over long distances, up to 3km.

The MC34CM0902WEF device is designed for applications where EMI/RFI performance is critical. The device offers better EMI and RFI performance than conventional devices, allowing it to be used in applications where EMI and RFI performance is vital. The device also features low noise transmission, which helps improve communication performance. The MC34CM0902WEF device is also ESD protected, allowing it to withstand ESD spikes up to 8kV.

The device is also designed for automotive applications and is compliant with Automotive Safety Integrity Level 3 (ASIL3) standards. This means that the device is designed for safety critical applications, such as electronic stability control, electronic brake systems, and engine control.

Working Principle

The MC34CM0902WEF device is based on an RS-485/RS-422 physical layer transceiver. The device contains four transistors: two receivers and two transceivers. The receivers are responsible for detecting the data signals and feeding them to the system. The transceivers handle the data transfer from the system to the bus. The device also includes a line driver, which is responsible for driving the transmitted data onto the data line.

The MC34CM0902WEF device has an integrated power-ON reset circuit, which monitors the power supply for brownouts, over-voltages and under-voltages. The circuit has an adjustable threshold and a maskable reset output, which can be asserted when the supply voltage falls below the user-defined threshold. This feature helps ensure that the device is in a known state during power-ON.

The device also contains several control functions. It supports Automatic Data Control (ADC) for half-duplex and full-duplex operations, as well as Break Detection and Clock Synchronization. The device also has an Integrated Data Pump, which is used for data transmission over the bus.

In addition to the physical layer transceiver and data pump, the MC34CM0902WEF device also includes a 7-bit address comparator, which is used for addressing/selecting slaves on the bus. The device also has a wake-up feature, which enables it to enter a low-power mode without having to reset the device.

Finally, the MC34CM0902WEF device has protection features which protect the device from ESD and surge events, and prevent the system from stress. The protection features include ESD protection up to 8kV, VCC transient protection, and short circuit protection.

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