MCP2120 datasheet(42/64 Pages) MICROCHIP

42 / 64 page

MCP2120/MCP2150 USER’S GUIDE

DS51246A-page 38

 2001 Microchip Technology Inc.

Figure 3.20: Debug Flowchart - MCP2120 Developer’s Board #2 Side

Debug Board #2

Data

appear on

Yes

MCP2120

RXIR

Data

appear on

Yes

MCP2120

RX pin?

pin?

Verify that the connection for

Board #1 TXIR to Optical

Transceiver and Board #2

Optical Transceiver to RXIR

(3 pin headers J6 and J7).

Ensure that the Optical

Transceivers are aligned.

Ensure that distance between

Board #1 and Board #2 is

approximately 6” (15 cm).

Try component transceiver

option on each board

(Board #1, then Board #2,

and lastly both boards)

Data

appear on

Yes

MAX232

T1IN

pin?

Data

appear on

Yes

MAX232

T1OUT

pin?

Verify 3 pin header J4

is jumpered correctly

Disconnect serial cable

that the MAX232 device

Verify that the connection from

PC #1 to Board #1 is good.

Try communication with

another serial device

(such as PICSTART Plus).

Problem with MCP2120

Verify device has power/ground

Try replacing with new MCP2120

Ensure jumper JP4 is open

Ensure crystal oscillator is correct

frequency and operating

Ensure Baud Rate is correct

(jumpers JP1, JP2, and JP3)

still no data, it appears

to ensure T1OUT is

not loaded down. If

is damaged

MCP2120 Datasheet(PDF) 42 Page - Microchip Technology

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