MCP2140A-I/SO View Datasheet(PDF) - Microchip Technology

Part Name

Description

Manufacturer

MCP2140A-I/SO

IrDA® Standard Protocol Stack Controller With Fixed 9600 Baud Communication Rate

Microchip Technology 

MCP2140A

FIGURE B-1: HIGH LEVEL MCP2140A CONNECTION SEQUENCE

Primary Device

Normal Disconnect Mode (NDM)

No IR Activity

(for 10 seconds)

Send XID Commands

(timeslots n, n+1, ...)

(approximately 70 ms

between XID commands)

MCP2140A

(Secondary Device)

PHACT pin driven Low

PHACT pin driven High

No Response

Finish sending XIDs

(max timeslots - y frames)

Broadcast ID

Discovery

Send SNRM Command

(w/ parameters and

connection address)

Open channel for IAS Queries

Send IAS Queries

XID Response in timeslot y,

claiming this timeslot, (MCP2140A

always claims timeslot 0)

No Response to these XIDs

No Response to Broadcast ID

UA response with parameters

using connect address

Confirm channel open for IAS

Provide IAS responses

Open channel for data

Normal Response Mode (NRM)

Send Data or Status

Confirm channel open for data

(MCP2140A DSR pin driven low)

Send Data or Status

Send Data or Status

Shutdown link

No IR Activity

(for 10 seconds)

Send Data or Status

Confirm shutdown

(back to NDM state)

PHACT pin driven Low

DS22050A-page 50

© 2007 Microchip Technology Inc.

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