MCP2120 datasheet(12/64 Pages) MICROCHIP

12 / 64 page

MCP2120/MCP2150 USER’S GUIDE

DS51246A-page 8

 2001 Microchip Technology Inc.

2.3.1.1

Selecting UART Source and Optical Transceiver

Interface

Figure 2.2 shows two pairs of jumpers used to route signals to and from the

MCP2120.

Jumpers J1 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 J6 and J7 are used to determine the source and destination of the

infrared data signals used by the interface between the MCP2120 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 2.2: MCP2120 Selecting Sources

C15

C12

C13

C14

MCP2120 Developer’s Board

02-01608 Rev. 1

R14

CR1

JP5

+5V

GND

R13

C16

JP3:JP1

000

=FOSC/768

001

=FOSC/384

010

=FOSC/192

011

=FOSC/128

100

=FOSC/64

111

=S/W Baud

Open=0

Integrated

Transceiver

JP4

(MCP2120)

Open=Enabled

D6 D2

C10

R11

R10

Component

Transceiver

R12

C18

R15

C11

These two jumpers select the

source of the Host signals.

Header is source.

DB9 is source.

J1 and J4

These two jumpers select the

optical transceiver logic. Both jumpers

Component Transceiver

Integrated Transceiver

J6 and J7

should connect the same pin positions

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