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3 / 58 page 2003 Microchip Technology Inc. Preliminary DS21790A-page 3 MCP2140 1.0 DEVICE OVERVIEW The MCP2140 is a cost-effective, low pin count (18-pin), easy-to-use device for implementing IrDA standard wireless connectivity. The MCP2140 provides support for the IrDA standard protocol “stack”, bit encoding/ decoding and low cost, discrete IR receiver circuitry. The serial and IR interface baud rates are fixed at 9600 baud. The serial interface and IR interface baud rates are dependent on the device frequency, but IrDA standard operation requires a device frequency of 7.3728 MHz. The MCP2140 will specify to the Primary Device the IR baud rate during the Discover phase. The MCP2140 can operate in Data Communication Equipment (DCE) and Data Terminal Equipment (DTE) applications, and sits between a UART and an infrared optical transceiver. The MCP2140 encodes an asynchronous serial data stream, converting each data bit to the corresponding infrared (IR) formatted pulse. IR pulses received are decoded and then handled by the protocol handler state machine. The protocol handler sends the appro- priate data bytes to the Host Controller in UART- formatted serial data. The MCP2140 supports “point-to-point” applications, that is, one Primary device and one Secondary device. The MCP2140 operates as a Secondary device and does not support “multi-point” applications. Sending data using IR light requires some hardware and the use of specialized communication protocols. These protocol and hardware requirements are described, in detail, by the IrDA standard specifications. The encoding/decoding functionality of the MCP2140 is designed to be compatible with the physical layer com- ponent of the IrDA standard. This part of the standard is often referred to as “IrPHY”. The complete IrDA standard specification is available for download from the IrDA website at www.IrDA.org. 1.1 Applications The MCP2140 Infrared Communications Controller, supporting the IrDA standard, provides embedded sys- tem designers the easiest way to implement IrDA stan- dard wireless connectivity. Figure 1-1 shows a typical application block diagram, while Table 1-2 shows the pin definitions. TABLE 1-1: OVERVIEW OF FEATURES Infrared communication is a wireless, two-way data connection using infrared light generated by low-cost transceiver signaling technology. This provides reliable communication between two devices. Infrared technology offers: • Universal standard for connecting portable computing devices • Easy, effortless implementation • Economical alternative to other connectivity solutions • Reliable, high-speed connections • Safe to use in any environment (can even be used during air travel) • Eliminates the hassle of cables • Allows PCs and other electronic devices (such as PDAs, cell phones, etc.) to communicate with each other • Enhances mobility by allowing users to easily connect The MCP2140 allows the easy addition of IrDA stan- dard wireless connectivity to any embedded applica- tion that uses serial data. Figure 1-1 shows typical implementation of the MCP2140 in an embedded system. The IrDA protocol for printer support is not included in the IrCOMM 9-wire “cooked” service class. Features MCP2140 Serial Communications UART, IR Baud Rate Selection Fixed Low Power Mode Yes Resets (and Delays) RESET, POR (PWRT and OST) Packages 18-pin DIP, SOIC, 20-pin SSOP |
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