MCP2140A-I/SO 查看數據表（PDF） - Microchip Technology

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MCP2140A-I/SO

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

Microchip Technology 

MCP2140A

2.14 Migrating from the MCP2140 to the

MCP2140A

This section shows you in the major differences

between the MCP2140 and the MCP2140A. Your appli-

cation may have other sensitivities and a complete sys-

tem validation should be done.

Table 2-3 shows the differences and enhancements of

the MCP2140A in comparison to the MCP2140.

TABLE 2-3: DIFFERENCE BETWEEN

MCP2140 AND MCP2140A

Feature

MCP2140 MCP2140A

Voltage Range

3.0V - 5.5V 2.0V - 5.5V

Frequency of Operation

(MHz)

7.3728

3.6864

UART operation

UART Receiver buffer

Size (bytes) (max.)

Half Duplex Full Duplex

29

60 (2)

UART Transmit buffer

Size (bytes) (max.)

IR Receiver Frame

Payload Size (bytes)

(max.)

IR Transmit Frame

Payload Size (bytes)

(max.)

29

64 (3)

64 (3)

60

64 (3)

64 (3)

Max IDD (uA) PHACT = H 2200

407

at min. VDD. PHACT = L

60

23

Integrated Optical

Transceivers RXD

wave shaping circuit

Required

Not

Required

(1)

Optical Transceiver RXPD High to Low High to Low

bit signal polarity

or

only

Low to High

Note 1: The External Wave Shaping Circuit is not

required. For applications replacing the

MCP2140, components of the circuit can

be replaced to effectively remove the

waveshaping circuit. See Section 2.13

“Optical Interface”.

2: The MCP2140A will drive the CTS signal

active after the UART Receive Buffer has

59 bytes. The Receive buffer supports the

reception of a 60th byte for systems that

have 0 delay between UART data bytes.

3: Includes 4 bytes overhead for 9-wire

“cooked” protocol. This means that there

are a maximum of 60 data bytes per

frame.

2.15 The PIC IrDA Standard Stack

Library and the MCP2140A

The MCP2140A is compatible with the PIC IrDA

Standard Stack Library routines for 16-bit PIC micro-

controllers. The application must use the Client Library

routines for the IrCOMM 9-wire Cooked protocol (for

Primary Device operation).

2.16 References

The IrDA Standards organization information can be

found at:

http://www.irda.org

Some common manufacturers of optical transceivers

are shown in Table 2-4.

TABLE 2-4:

COMMON OPTICAL

TRANSCEIVER

MANUFACTURERS

Company

Sharp®

Infineon®

Agilent®

Vishay®/Temic

Rohm

Company Web Site Address

www.sharpsma.com

www.infineon.com

www.agilent.com

www.vishay.com

www.rohm.com

DS22050A-page 24

© 2007 Microchip Technology Inc.

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