MCP2140AT-ISLASHSS datasheet(24/60 Pages) MICROCHIP

24 / 60 page

MCP2140A

DS22050A-page 24

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

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

Feature

MCP2140

MCP2140A

Voltage Range

3.0V - 5.5V

2.0V - 5.5V

Frequency of Operation

(MHz)

7.3728

3.6864

UART operation

Half Duplex Full Duplex

UART Receiver buffer

Size (bytes) (max.)

60 (2)

UART Transmit buffer

Size (bytes) (max.)

IR Receiver Frame

Payload Size (bytes)

(max.)

64 (3)

IR Transmit Frame

Payload Size (bytes)

(max.)

64 (3)

Max IDD (uA)

at min. VDD.

PHACT = H

2200

407

PHACT = L

Integrated Optical

Transceivers RXD

wave shaping circuit

Required

Not

Required

(1)

Optical Transceiver RXPD

bit signal polarity

High to Low

Low to High

High to Low

only

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.

Company

Company Web Site Address

Sharp®

www.sharpsma.com

Infineon®

www.infineon.com

Agilent®

www.agilent.com

Vishay®/Temic

www.vishay.com

Rohm

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