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MCP2122 Datasheet(PDF) 3 Page - Microchip Technology |
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MCP2122 Datasheet(HTML) 3 Page - Microchip Technology |
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3 / 38 page  © 2007 Microchip Technology Inc. Preliminary DS21894C-page 3 MCP2122 1.0 DEVICE OVERVIEW The MCP2122 is a stand-alone IrDA standard encoder/ decoder device that is pinout-compatible with the Agilent® HSDL-7000 encoder/decoder. The MCP2122 has two interfaces: the host UART interface and the IR interface (see Figure 1-1). The host UART interfaces to the UART of the Host Controller. The Host Controller is the device in the embedded system that transmits and receives the data. The IR interface connects to an infrared (IR) optical transceiver circuit that converts electrical pulses into IR light (encode) and converts IR light into electrical pulses (decode). This IR optical transceiver circuit could be either a standard infrared optical transceiver (such as a Vishay® TFDU 4300) or it could be implemented with discrete components. For additional information, please refer to AN243, “Fundamentals of the Infrared Physical Layer” (DS00243). When the Host Controller transmits the UART format data, the MCP2122 receives this UART data and encodes (modulates) it bit by bit. This encoded data is then output as electrical pulses to the IR transceiver. The IR transceiver will then convert these electrical pulses to IR light pulses. The IR transceiver also receives IR light pulses (data), which are outputted as electrical pulses. The MCP2122 decodes (demodulates) these electrical pulses, with the data then being transmitted by the MCP2122 UART. This modulation/demodulation method is performed in accordance with the IrDA standard. Table 1-1 shows an overview of some of the device features. Figure 1-1 shows a typical application block diagram. Table 1-2 shows the pin definitions of the MCP2122 during normal operation. TABLE 1-1: MCP2122 FEATURES OVERVIEW Infrared Technology Features: • Universal standard for connecting portable computing devices • Effortless implementation • Economical alternative to other connectivity solutions • Reliable, high-speed connection • Safe to use in any environment; can even be used during air travel • Eliminates the hassle of cables • Allows PCs and non-PCs to communicate with each other • Enhances mobility by allowing users to easily connect 1.1 Applications Some applications where an IR interface (MCP2122) could be used include: • Data-Logging/Data Exchange • System Setup • System Diagnostic Read Out • Manufacturing Configuration • Host Controller Firmware Updates • System Control FIGURE 1-1: SYSTEM BLOCK DIAGRAM Features MCP2122 Serial Communications: UART, IR Baud Rate Selection: 16XCLK Low-power Mode: Yes Packages: 8-pin PDIP 8-pin SOIC Encode Decode TX TXIR RX RXIR RESET MCP2122 PIC® SO SI TFDU 4300 TXD RXD Reset Logic Clock Logic 16XCLK Clock Host UART Interface IR Interface Host Controller Protocol Handler Optical Transceiver (I/O) MCU |
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