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MCP2120

Infrared Encoder/Decoder

Microchip Technology 

MCP2120

1.0 DEVICE OVERVIEW

This document contains device specific information for

the following device:

• MCP2120

This device is a low-cost, high-performance, fully-static

infrared encoder/decoder. This device sits between a

UART and an infrared (IR) optical transceiver.

The data received from a standard UART is encoded

(modulated), and output as electrical pulses to the IR

Transceiver. The IR Transceiver also receives data

which it outputs as electrical pulses. The MCP2120

decodes (demodulates) these electrical pulses and

then the data is transmitted by the MCP2120 UART.

This modulation and demodulation method is

performed in accordance with the IrDA standard.

Typically a microcontroller interfaces to the IR encoder/

decoder.

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 connection

• Safe to use in any environment; can even be used

during air travel

• Eliminates the hassle of cables

• Allows PC’s and non-PC’s to communicate to

each other

• Enhances mobility by allowing users to easily

connect

1.1 Applications

The MCP2120 is a stand–alone IrDA Encoder/Decoder

product. Figure 1-1 shows a typical application block

diagram. Table 1-2 shows the pin definitions in the user

(normal) mode of operation.

TABLE 1-1: MCP2120 FEATURES

OVERVIEW

Features

Serial Communications:

Baud Rate Selection:

Low Power Mode:

Resets: (and Delays)

Packages:

MCP2120

UART, IR

Hardware/Software

Yes

Wake-up (DRT)

14-pin DIP

14-pin SOIC

FIGURE 1-1:

System Block Diagram

Micro–

Controller

TX

MCP2120

TX

Encode TXIR

Power

EN

Down

Logic

RX

RX

RXIR

Decode

Optical

Transceiver

TXD

RXD

BAUD2

BAUD1

BAUD0

I/O

MODE

(S/W Mode)

Baud Rate

Generator

© 2007 Microchip Technology Inc.

DS21618B-page 3

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