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MAX3223EEVKIT データシートの表示（PDF） - Maxim Integrated

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MAX3223EEVKIT

MAX3223E Evaluation Kit

Maxim Integrated

MAX3223EEVKIT Datasheet PDF : 7 Pages

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MAX3223E Evaluation Kit

Quick Start—Digital Loopback

Required Equipment

• MAX3223E EV kit (DB9 I/O extension cable included)

• A user-supplied Windows® 2000/XP- or Windows

Vista®-compatible PC with a spare RS-232 serial port

• 3.3V DC power supply

Note: In the following sections, software-related items

are identified by bolding. Text in bold refers to items

directly from the EV kit software. Text in bold and under-

lined refers to items from the Windows operating system.

Procedure

The MAX3223E EV kit is fully assembled and tested.

Follow the steps below to verify board operation. This

procedure is written for one particular terminal emulator

(RealTerm version 2.0.0.57), but any terminal emulation

software should work.

1) Visit www.maxim-ic.com/evkitsoftware to down-

load the latest version of the EV kit software,

3223Rxx.ZIP. Save the EV kit software to a tempo-

rary folder and uncompress the ZIP file. The EV kit

software consists of the free, open-source ter-

minal emulator, RealTerm (also available from

http://realterm.sourceforge.net).

2) Verify that all jumpers (JU1–JU11) are in their

default positions, as shown in Table 1.

3) Connect the 3.3V DC power supply between the

VCC and GND pads on EV kit.

4) Connect the DB9 I/O extension cable between the

EV kit and the computer’s serial port.

5) Start the RealTerm software by opening its icon in

the Start | Programs menu. The RealTerm software

main window appears, as shown in Figure 1. Note:

If the serial cable is connected to a serial port other

than COM1, then bring up the Port tab and open

the corresponding serial port.

6) Install a shunt across jumper JU1 pins 2-3 to

enable normal operation.

7) Install a shunt across jumper JU9 pins 1-2 to

enable digital loopback.

8) Enable the 3.3V DC power supply.

9) In the RealTerm window, click in the display area

and type on the keyboard. The digital loopback con-

nection immediately relays each character from the

receiver to the transmitter, so each character typed

on the keyboard appears in the display area.

10) Move the JU1 shunt to pins 1-2 to disable the

MAX3223E.

11) In the RealTerm window, click in the display area

and type on the keyboard. With the MAX3223E dis-

abled, characters typed on the keyboard do not

appear in the display area.

Quick Start—External

Microcontroller