New Original IC MCP2122-E/SN

The MCP2122 is a stand-alone IrDA standard encoder/decoder device that is pinout-compatible with theAgilent® HSDL-7000 encoder/decoder.The MCP2122 has two interfaces: the host UARTinterface and the IR interface (see Figure 1-1). The hostUART interfaces to the UART of the Host Controller.The Host Controller is the device in the embeddedsystem that transmits and receives the data. The IRinterface connects to an infrared (IR) optical transceivercircuit that converts electrical pulses into IR light(encode) and converts IR light into electrical pulses(decode). This IR optical transceiver circuit could beeither a standard infrared optical transceiver (such as aVishay® TFDU 4300) or it could be implemented withdiscrete components. For additional information, pleaserefer to AN243, "Fundamentals of the Infrared PhysicalLayer" (DS00243).When the Host Controller transmits the UART formatdata, the MCP2122 receives this UART data andencodes (modulates) it bit by bit. This encoded data isthen output as electrical pulses to the IR transceiver.The IR transceiver will then convert these electricalpulses to IR light pulses.The IR transceiver also receives IR light pulses (data),which are outputted as electrical pulses. The MCP2122decodes (demodulates) these electrical pulses, withthe data then being transmitted by the MCP2122UART. This modulation/demodulation method isperformed in accordance with the IrDA standard.

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