MCP2155_13 datasheet(3/52 Pages) MICROCHIP

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 2001-2013 Microchip Technology Inc.

Preliminary

DS21690B-page 3

MCP2155

1.0

DEVICE OVERVIEW

This document contains device specific information for

the following device:

• MCP2155

The MCP2155 is a cost effective, low pin count (18-

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

dard wireless connectivity. The MCP2155 handles for

the IrDA standard protocol “stack” plus bit encoding/

decoding. The MCP2155 operates in Data Communi-

cation Equipment (DCE) applications and sits between

a UART and an infrared optical transceiver.

The Serial interface baud rates are user selectable to

one of four IrDA standard baud rates between 9600

baud and 115.2 kbaud (9600, 19200, 57600, 115200).

The IR baud rates are user selectable to one of five

IrDA standard baud rates between 9600 baud and

115.2 kbaud (9600, 19200, 38400, 57600, 115200).

The serial interface baud rate will be specified by the

BAUD1:BAUD0 pins, while the IR baud rate is specified

by the Host Controller. This means that the baud rates

do not need to be the same.

The MCP2155 encodes an asynchronous serial data

stream, converting each data bit to the corresponding

infrared (IR) formatted pulse. IR pulses that are

received are decoded, and then handled by the proto-

col handler state machine. The protocol handler will

then send the appropriate data bytes to the host con-

troller in UART formatted serial data.

The MCP2155 supports “point-to-point” applications.

That is one Primary device and one Secondary device.

The MCP2155 is a secondary device and does not sup-

port “multi-point” applications.

Sending data using IR light requires some hardware

and the use of specialized communications protocols.

These protocols and hardware requirements are

described in detail by the IrDA standard specifications.

The encoding/decoding functionality of the MCP2155

is designed to be compatible with the physical layer

component of the IrDA standard. This part of the stan-

dard is often referred to as “IrPHY”.

The complete IrDA standard specifications are avail-

able

for

download

from

the

IrDA

website

(www.IrDA.org).

21690B.book Page 3 Thursday, January 10, 2013 1:06 PM

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