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MCP2122

Infrared Encoder/Decoder

Microchip Technology 

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

Features

MCP2122

Serial Communications:

Baud Rate Selection:

Low-power Mode:

Packages:

UART, IR

16XCLK

Yes

8-pin PDIP

8-pin SOIC

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

Host Controller

PIC®

MCU

SO

Host UART

Interface

Protocol Handler

MCP2122

TX

Encode

TXIR

IR

Optical

Interface Transceiver

TFDU 4300

TXD

SI

Clock

(I/O)

RESET

16XCLK

RX

Decode

Reset

Logic

Clock

Logic

RXIR

RXD

© 2007 Microchip Technology Inc.

Preliminary

DS21894C-page 3

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