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DEVICE OVERVIEW

The MCP2140A is a cost-effective, low pin count (18-pin), easy-to-use device for implementing IrDA standard wireless connectivity. The MCP2140A provides support for the IrDA standard protocol “stack”, bit encoding/decoding and low cost, discrete IR receiver circuitry. The MCP2140A is footprint compatible with the MCP2140. For migration assistance, please refer to Section 2.14 “Migrating from the MCP2140 to the MCP2140A”.

The serial and IR interface baud rates are fixed at 9600 baud. The serial interface and IR interface baud rates are dependent on the device frequency, but IrDA standard operation requires a device frequency of 3.6864 MHz.

The MCP2140A will specify the IR baud rate to the Primary Device during the Discover phase.

The MCP2140A can operate in Data Communication Equipment (DCE) and Data Terminal Equipment (DTE) applications, and resides between a UART and an infrared optical transceiver.

Features

? Implements the IrDA? standard, including:

- IrLAP

- IrLMP

- IAS

- TinyTP

- IrCOMM (9-wire “cooked” service class)

? Provides IrDA standard physical signal layer support including:

- Bidirectional communication

- CRC implementation

- Fixed Data communication rate of 9600 baud

? Includes UART-to-IrDA standard encoder/decoder functionality:

- Easily interfaces with industry standard UARTs and infrared transceivers

? Easily communicates with 16-bit PIC Microcontroller IrDA Standard Stack Library

? UART interface for connecting to Data

Communications Equipment (DCE) or Data Terminal Equipment (DTE) systems

? Transmit/Receive formats (bit width) supported:

- 1.63 μs (Transmit & Receive)

- 3/16 bit time (Receive Only)

? Hardware UART Support:

- 9.6 kbaud baud rate

- 60 Byte Data Buffer Size (64 Byte Packet)

? Infrared Supported:

- 9.6 kbaud baud rate

- 64 Byte Packet Size (60 Data Bytes)

? Operates as Secondary Device

? Wide Operating Voltage: 2.0V to 5.5V

? Automatic Low Power mode:

- < 23 μA (maximum) @ 2.0V, when no IR activity present (PHACT = L)

? Footprint Compatibility with MCP2140

CMOS Technology

? Low power, high-speed CMOS technology

? Low voltage operation

? Industrial temperature range

? Low power consumption:

- < 407 μA (maximum) @ 2.0V, 3.6864 MHz

Applications

The MCP2140A Infrared Communications Controller, supporting the IrDA standard, provides embedded system designers the easiest way to implement IrDA standard wireless connectivity. Figure 1-1 shows a typical application block diagram, while Table 1-1 shows the pin definitions.