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Adn006
1.
Wireless Communication Using
the IrDAÂź Standard Protocol By Bonnie C. Baker, Microchip Technology Inc. ANALOG DESIGN NOTE ADN006 The two most popular mediums in the wireless arena are Infrared The host controller controls the MCP2150 by sending (IR) and Radio Frequency (RF). When asked to develop a and receiving data through its UART interface port. The wireless system, you may be concerned about cost, ease-of- MCP2150, which is positioned between the host controller design, and distance requirements. IR technologies are better UART device and infrared optical transceiver, decodes and suited for short distance, low-to-medium data throughput, encodes the signal. wireless communication channels. Two common types of IR The MCP2150 has two independent baud rates. One of the technologies are currently in use. These are the TV Remote baud rates is for communication with the Primary device (TVR) and the IrDA (Infrared Data Association) standard protocol. (PDA). The Primary device negotiates this baud rate with the The lowest cost wireless connection technology is TVR. The MCP2150, as defined in the IrDA standard. The second baud trade-off with this technology is between distance and bit-rate. rate is set with the two hardware pins, BAUD1 and BAUD0. Usually this interface is also unidirectional. If a bidirectional, This second baud rate is for communication with the host higher data bandwidth is required in your application, you may controller. opt to design an IrDA system. This infrared communication The IrDA standard is a network protocol and follows a standard has been defined by the IrDA industry-based group(1). layered approach in its definition. A model of the IrDA This group has developed communication standards that are protocol stack is shown in Figure 2. These protocols deal well suited for low-cost, short-range, point-to-point infrared with a manageable set of responsibilities and also supply channels. These types of channels operate over a wide range needed capabilities to the layers above and below. of speeds under a cross-platform environment. IrDA standards have been used to install over 300 million low-cost, short-range The MCP2150 is an IrDA standard Protocol Stack Controller, communication systems in laptops, printers, handheld PCs, and which provides support for the IrDA standard protocol âstackâ PDAs, to name a few. plus bit encoding/decoding. An example of an IrDA standard embedded system is shown One of the functions of the MCP2150 is to encode and in Figure 1. In this system, the Primary device (PDA) searches decode the asynchronous serial data stream. for other IrDA standard devices. The Secondary device (Host Controller and MCP2150) will respond to queries from the Primary device. Host UART Palmâą Handheld Device Optical Controller Interface MCP2150 with IrDAÂź Standard Transceiver Infrared Port Embedded Application TX TXIR TX Encode TXD UART EN Power Down Logic RX RXIR RX Decode RXD BAUD1 Baud Rate BAUD0 Generator RTS CTS DSR UART DTR Control CD RI Primary Device Secondary Device Figure 1. The Primary Device (PDA) sends data through the infrared interface to the MCP2150. The MCP2150 then decodes this data into the UART standard. After translation, the data is sent to the Host Controller through the UART interface. The Host Controller can also send data to the MCP2150 where the data is encoded and made ready for transmission to the Primary device. © 2003 Microchip Technology, Inc. DS21843A - Page 1
2.
IrTRAN-P
IrObex IrLAN IrCOMM (1) IrMC allows easy connections to PC serial ports. Another product available is the MCP2155, which is best suited for serial port LM-IAS Tiny Transport Protocol (Tiny TP) interfaces (ie., modems). In all cases, these point-to-point IR Link Management - Mux (IrLMP) systems connect to devices of âhigher intelligenceâ, such as IR Link Access - Mux (IrLAP) PCs, PDAs, etc.. This minimizes the cost of MCP215X-type Asynchronous Serial IR Synchronous Serial Synchronous Fast devices. The MCP215X can also serve as a primary device in (2, 3) (SIR) IR (1.15 MBaud) IR (FIR) these point-to-point applications. Both devices provide support (9600 - 115200 Baud) (4 MBaud) for the IrDA standard protocol âstackâ plus bit encoding and decoding capability. Figure 2. This IrDA protocol stack has been defined by the IrDA industry-based group. Within the protocol stack Another product in this family from Microchip is the MCP2140, data communications, details, as well as the data which is an IrDA standard protocol stack controller with a fixed structures, are defined. baud communication rate of 9600. Adding IR connectivity to The encode/decode translation format is shown in Figures 3 cost-sensitive, high volume, embedded applications was not and 4. Figure 3 shows how the received IR data from the PDA really feasible prior to the introduction of the MCP215X and is decoded to UART-formatted data. Figure 4 demonstrates MCP2140 parts. These parts remove the requirement of the how data is taken from the Host Controller, into the MCP2150, system designer needing to implement the complex IrDA stack. and encoded in preparation of transmission to the PDA. The Finally, the MCP2120 is an infrared encoder/decoder chip. IrDA bit format is the NAND of the UART signal. The bits are Sending data using IR light requires some hardware and inverted and high pulses are shortened in order to reduce the specialized communication protocols. These protocol and optics power consumption. The MCP2150 decodes the IR data, hardware requirements are described, in detail, in the IrDA which is then handled by the protocol handler state machine. standard specifications. The encoding/decoding functionality The protocol handler sends the appropriate data bytes to the of the MCP2150 is designed to be compatible with the physical Host Controller in UART-formatted serial data. layer component of the IrDA standard. This part of the standard The MCP2150 replaces a wired serial connection with a is often referred to as âIrPHYâ. Additionally, the MCP2150 wireless solution. The MCP2150 allows designers to add IrDA handles the speciallized communication protocol, IrCOMM wireless connectivity to their embedded system designs easily (9-wire âcookedâ service class). A complete list of IrDA standard and cost effectively. With this device, the host UART interface specifications is available on the IrDA website (www.irda.org). Start Bit Data bit 0 Data bit 1 Data bit 2 Data bit ... 16 CLK BITCLK (CLK) â„ 13 CLK) RXIR Bit Value â„ 1.6 ”s up to 3 CLK) 16 CLK 16 CLK 16 CLK 16 CLK 16 CLK 16 CLK RX 0 1 0 0 1 0 Figure 3. Bit Encoding Start Bit Data bit 0 Data bit 1 Data bit 2 Data bit ... 16 CLK BITCLK TX Bit Value 7 CLK TXIR 24 TOSC 0 1 0 0 1 0 Figure 4. Bit Encoding Recommend References: (1)www.irda.org - Trade Association for Defining Infrared Standards, IrDA System Protocol consortium web site. AN858 - âInterfacing the MCP215X to a Host Controllerâ, Palmer, Mark, Microchip Technology Inc. For more information, please visit www.microchip.com The Microchip name and logo and the Microchip logo are registered trademarks of Microchip Technology Inc. in the U.S.A. and other countries. IrDA is a registered trademark of the Infrared Data Association. All other trademarks mentioned herein are the property of their respective owners. Information subject to change. © 2004 Microchip Technology Inc. 1/2004 DS21843A - Page 2 © 2003 Microchip Technology, Inc.
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