MCP2140A Datasheet, PDF (52/60 Pages) Microchip Technology – IrDA® Standard Protocol Stack Controller With Fixed 9600 Baud Communication Rate

MCP2140A
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 C-2 shows the IrDA data protocol stack and
which components are implemented by the
MCP2140A.
FIGURE C-2: IRDA DATA - PROTOCOL
STACKS
IrTran-P IrObex IrLan IrComm ⁽¹⁾ IrMC
LM-IAS Tiny Transport Protocol (Tiny TP)
IR Link Management - Mux (IrLMP)
IR Link Access Protocol (IrLAP)
Asynchronous Synchronous Synchronous
Serial IR ^{(2, 3)}
Serial IR
4 PPM
(9600 -115200 b/s) ^{(1.152 Mb/s) (4 Mb/s)}
Supported by
the MCP2140A
Optional IrDA data
protocols not
supported by
the MCP2140A
Note 1:
2:
3:
The MCP2140A implements the 9-wire
“cooked” service class serial replicator.
The MCP2140A is fixed at 9600 Baud.
An optical transceiver is required.
C.1 IrDA STANDARD DATA
PROTOCOLS SUPPORTED BY
MCP2140A
The MCP2140A supports these required IrDA standard
protocols:
• Physical Signaling Layer (PHY)
• Link Access Protocol (IrLAP)
• Link Management Protocol/Information Access
Service (IrLMP/IAS)
The MCP2140A also supports some of the optional
protocols for IrDA data. The optional protocols that the
MCP2140A implements are:
• Tiny TP
• IrCOMM
C.1.1 PHYSICAL SIGNAL LAYER (PHY)
The MCP2140A 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
Note: MCP2140A supports 9600 Baud only.
• Data Communication Rate
- 9600 baud minimum data rate (with primary
speed/cost steps of 115.2 kbaud
Note: MCP2140A supports 9600 Baud only.
The following Physical Layer Specification is
dependant 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
objective for operation from contact to at
least 20 cm (low power and low power) or
30 cm (low power and standard power)
DS22050A-page 52
© 2007 Microchip Technology Inc.