MCP2120 datasheet(18/64 Pages) MICROCHIP

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MCP2120/MCP2150 USER’S GUIDE

DS51246A-page 14

 2001 Microchip Technology Inc.

2.3.2.1

Selecting UART Source and Optical Transceiver

Interface

Figure 2.8 shows two sets of jumpers used to route signals to and from the

MCP2150.

Jumpers J2, J3 and J4 are used to determine the source of the signals used

by the UART interface. When the header has the pins closest to the “DB9”

label jumpered to the center pin, the DB9 is the source of the UART signal.

When the header has the pins closest to the “Header” label jumpered to the

center pin, the four-pin header is the source of the UART signal.

Jumpers J7 and J8 are used to determine the source and destination of the

IrDA signals used by the interface between the MCP2150 and Optical

Transceiver. When the header has the pins closest to the “Integrated

Transceiver” label jumpered to the center pin, the integrated transceiver is

used. When the header has the pins closest to the “Component Transceiver”

label jumpered to the center pin, the component transceiver logic is used.

Figure 2.8: MCP2150 Selecting Sources

These three jumpers select the

source of the Host signals.

Header is source.

DB9 is source.

J2, J3 and J4

These two jumpers select the

optical transceiver logic. Both jumpers

Component Transceiver

Integrated Transceiver

J7 and J8

should connect the same pin positions

MCP2150 Dev Board

02-01609 Rev. 1

+5VGND

R11

C16

Integrated

Transceiver

R13

JP2 JP1 BAUD

9600

19200

57600

115200

Component

Transceiver

BT1

C17

C15

CR1

C16 C12

C4 C2

C10

R2 JP3

(MCP2150)

Open=Enabled

JP2 JP1

Power

C11

R8 D2D5

R6 C13

R14

R10

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