MCP2155_13 datasheet(11/52 Pages) MICROCHIP

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 2001-2013 Microchip Technology Inc.

Preliminary

DS21690B-page 11

MCP2155

The IrDA standard specifies the following protocols:

• Physical Signaling Layer (PHY)

• Link Access Protocol (IrLAP)

• Link Management Protocol/Information Access

Service (IrLMP/IAS)

The IrDA data lists optional protocols. These are:

•Tiny TP

• IrTran-P

• IrOBEX

•IrLAN

•IrCOMM

•IrMC

•IrDA Lite

Figure 2-6 shows the IrDA data protocol stack and

which components are implemented by the MCP2155.

FIGURE 2-6:

IRDA DATA - PROTOCOL

STACKS

2.9.1

IrDA DATA PROTOCOLS

SUPPORTED BY MCP2155

The MCP2155 supports these required IrDA standard

protocols:

• Physical Signaling Layer (PHY)

• Link Access Protocol (IrLAP)

• Link Management Protocol/Information Access

Service (IrLMP/IAS)

The MCP2155 also supports some of the optional pro-

tocols for IrDA data. The optional protocols that the

MCP2155 implements are:

•Tiny TP

•IrCOMM

2.9.1.1

Physical Signal Layer (PHY)

The MCP2155 provides the following Physical Signal

Layer specification support:

• Bi-directional communication

• Data Packets are protected by a CRC

- 16-bit CRC for speeds up to 115.2 kbaud

• Data Communication Rate

- 9600 baud minimum data rate (with primary

speed/cost steps of 115.2 kbaud)

The following Physical Layer Specification is depen-

dant on the optical transceiver logic used in the appli-

cation. The specification states:

• Communication Range, which sets the end user

expectation for discovery, recognition and perfor-

mance

- Continuous operation from contact to at least

1 meter (typically 2 meters can be reached)

- A low power specification reduces the objec-

tive for operation from contact to at least

20 cm (low power and low power) or 30 cm

(low power and standard power).

IrComm (1)

IR Link Management - Mux (IrLMP)

IR Link Access Protocol (IrLAP)

Optional IrDA data

protocols not

Supported by

the MCP2155

supported by

the MCP2155

IrTran-P

IrObex IrLan

IrMC

LM-IAS

Tiny Transport Protocol (Tiny TP)

Synchronous

4 PPM

(4 Mb/s)

Synchronous

Serial IR

(1.152 Mb/s)

Asynchronous

Serial IR (2)

(9600 -115200 b/s)

Note 1: The MCP2155 implements the 9-wire

“cooked" service class serial replicator

2: An optical transceiver is required

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