MCP2155_13 Datasheet, PDF (3/52 Pages) Microchip Technology – IrDA® Standard Protocol Stack Controller

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.
MCP2155
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).
 2001-2013 Microchip Technology Inc.
Preliminary
DS21690B-page 3