MCP2140-ISO datasheet(46/58 Pages) MICROCHIP

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MCP2140

DS21790A-page 46

Preliminary

 2003 Microchip Technology Inc.

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. They are:

•Tiny TP

• IrTran-P

• IrOBEX

•IrLAN

•IrCOMM

•IrMC

•IrDA Lite

Figure B-2 shows the IrDA data protocol stack and

which components are implemented by the MCP2140.

FIGURE B-2:

IRDA DATA - PROTOCOL

STACKS

B.1

IrDA STANDARD DATA

PROTOCOLS SUPPORTED BY

MCP2140

The MCP2140 supports these required IrDA standard

protocols:

• Physical Signaling Layer (PHY)

• Link Access Protocol (IrLAP)

• Link Management Protocol/Information Access

Service (IrLMP/IAS)

The MCP2140 also supports some of the optional pro-

tocols for IrDA data. The optional protocols that the

MCP2140 implements are:

•Tiny TP

•IrCOMM

B.1.1

PHYSICAL SIGNAL LAYER (PHY)

The MCP2140 provides the following Physical Signal

Layer specification support:

• Bidirectional 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

application. The specification states:

• Communication Range, which sets the end user

expectation for discovery, recognition and

performance.

- 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 MCP2140

supported by

the MCP2140

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, 3)

(9600 -115200 b/s)

Note 1: The MCP2140 implements the 9-wire

“cooked” service class serial replicator.

2: The MCP2140 is fixed at 9600 Baud.

3: An optical transceiver is required.

Note:

MCP2140 supports 9600 Baud only.

Note:

MCP2140 supports 9600 Baud only.

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