MCP2155_13 datasheet(22/52 Pages) MICROCHIP

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MCP2155

DS21690B-page 22

Preliminary

 2001-2013 Microchip Technology Inc.

2.14

Optical Transceiver

The MCP2155 requires an infrared transceiver. The

transceiver can be a integrated solution. Table 2-5

shows a list of common manufacturers of integrated

optical transceivers. A typical optical transceiver circuit

using a Vishay/Temic TFDS4500 is shown in Figure 2-

12.

FIGURE 2-12:

TYPICAL OPTICAL

TRANSCEIVER

CIRCUIT

The optical transceiver logic can be implemented with

discrete components, for component cost savings.

Care must be taken in the design and layout of the

photo detect circuit. This is due to the small signals that

are being detected and their sensitivity to noise. A dis-

crete implementation of the optical transceiver logic is

implemented on the MCP2120 and MCP2150 Devel-

oper’s Kit boards.

2.15

References

The IrDA Standards download page can be found at:

http://www.irda.org/standards/specifications

Some common manufacturers of Optical Transceivers

are shown in Table 2-5.

TABLE 2-5:

COMMON OPTICAL

TRANSCEIVER

MANUFACTURERS

Note:

The discrete optical transceiver implemen-

tation on the MCP2120 and MCP2150

Developer’s Kit boards may not meet the

IrDA specifications for the physical layer

(IrPHY). Any discrete solution will require

appropriate validation for the user’s appli-

cation.

+5V

R11



TFDS4500



R13

C18

F

RXIR

Pin 3)

(To MCP2155

Pin 2)

TXIR

(To MCP2155

Company

Company Web Site Address

Infineon

www.infineon.com

Agilent

www.agilent.com

Vishay/Temic

www.vishay.com

Rohm

www.rohm.com

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