MCP2140A データシートの表示（PDF） - Microchip Technology

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MCP2140A

IrDA® Standard Protocol Stack Controller With Fixed 9600 Baud Communication Rate

Microchip Technology 

1.0 DEVICE OVERVIEW

The MCP2140A is a cost-effective, low pin count (18-

pin), easy-to-use device for implementing IrDA

standard wireless connectivity. The MCP2140A

provides support for the IrDA standard protocol “stack”,

bit encoding/decoding and low cost, discrete IR

receiver circuitry. The MCP2140A is footprint

compatible with the MCP2140. For migration

assistance, please refer to Section 2.14 “Migrating

from the MCP2140 to the MCP2140A”.

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

3.6864 MHz.

The MCP2140A will specify the IR baud rate to the

Primary Device during the Discover phase.

The MCP2140A can operate in Data Communication

Equipment (DCE) and Data Terminal Equipment (DTE)

applications, and resides between a UART and an

infrared optical transceiver.

The MCP2140A 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

appropriate data bytes to the Host Controller in UART-

formatted serial data.

The MCP2140A supports “point-to-point” applications,

that is, one Primary device and one Secondary device.

The MCP2140A 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 specifica-

tions. The encoding/decoding functionality of the

MCP2140A is designed to be compatible with the

physical layer component of the IrDA standard. This

part of the standard is often referred to as “IrPHY”.

Some of the devices that the MCP2140A is compatible

with include:

• PCs with IR ports

• PDAs

• 16-bit PIC Microcontroller IrDA Standard Stack

Library

The complete IrDA standard specification is available

for download from the IrDA web site at www.IrDA.org.

MCP2140A

1.1 Applications

The MCP2140A Infrared Communications Controller,

supporting the IrDA standard, provides embedded

system designers the easiest way to implement IrDA

standard wireless connectivity. Figure 1-1 shows a

typical application block diagram, while Table 1-1

shows the pin definitions.

TABLE 1-1: OVERVIEW OF FEATURES

Features

MCP2140A

Serial Communications

Baud Rate Selection

Low Power Mode

Resets (and Delays)

Packages

UART, IR

Fixed

Yes - Automatic

RESET, POR

(PWRT and OST)

18-pin DIP, SOIC,

20-pin SSOP

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)

• No emissions testing needed (FCC, Part 15)

• 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 MCP2140A allows the easy addition of IrDA

standard wireless connectivity to any embedded

application that uses serial data. Figure 1-1 shows

typical implementation of the MCP2140A in an

embedded system.

The IrDA protocol for printer support is not included in

the IrCOMM 9-wire “cooked” service class.

© 2007 Microchip Technology Inc.

DS22050A-page 3

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