CMAXQUSB Просмотр технического описания (PDF) - Maxim Integrated

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CMAXQUSB

Evaluates: SPI and SMBus/I2C-Compatible Parts

Maxim Integrated 

CMAXQUSB User’s Guide

Component Suppliers

SUPPLIER

PHONE

WEBSITE

Murata Electronics North America, Inc.

770-436-1300

www.murata-northamerica.com

Panasonic Corp.

800-344-2112

www.panasonic.com

Suntsu Frequency Control

949-305-0220

www.suntsuinc.com

Taiyo Yuden

800-348-2496

www.t-yuden.com

TDK Corp.

847-803-6100

www.component.tdk.com

Note: Indicate that you are using the CMAXQUSB or MAXQ2000 when contacting these component suppliers.

Quick Start

Maxim EV systems whose ordering number ends in

EVCMAXQU are two-board sets, comprising a

CMAXQUSB interface board and an EV kit board specif-

ic to the device being evaluated. For example, the

MAX6870EVCMAXQU would be a two-board set consist-

ing of the MAX6870EVKIT and the CMAXQUSB. The fol-

lowing generic quick start procedure assumes that the

CMAXQUSB board will be used with a companion EV kit.

Required Equipment

• Any Maxim EV system with the EVCMAXQU suffix,

such as the MAX6870EVCMAXQU

Device-specific EV kit board

CMAXQUSB interface board

USB type A-to-B cable (included with the CMAXQUSB)

• Computer running Windows 98SE/2000/XP with a

spare USB port

Administrator privileges may be required when first

installing the device on Windows 2000/XP.

Procedure

Do not turn on the power until all connections are

complete.

1) Select 2.5V, 3.3V, or 5V logic by setting the

CMAXQUSB VDD SELECT jumper. See the Jumper

Tables section.

2) Ensure that the companion EV kit board’s jumper

settings are correct. Refer to your companion EV

kit’s documentation.

3) Connect the boards together.

4) Install the evaluation software on your computer by

running the INSTALL.EXE program on the installa-

tion disk. The program files are copied and icons

are created for them in the Windows Start menu.

5) Connect the USB cable between the CMAXQUSB

and the computer. When you plug in the CMAXQUSB

board for the first time, the Windows plug-and-play

system detects the new hardware and automatically

runs the Add New Hardware Wizard (if the Add New

Hardware Wizard does not appear after a minute,

unplug the board from the USB and plug it in again).

Make certain to specify the search location. Maxim

software designed for CMAXQUSB includes a copy

of the device driver in the installed software directo-

ry. Refer to Application Note 3601: Troubleshooting

Windows Plug-and-Play and USB for Maxim

Evaluation Kits for more details.

6) During device driver installation, Windows XP shows

a warning message indicating that the device driver

Maxim uses does not contain a digital signature.

This is not an error condition and it is safe to pro-

ceed with the installation.

7) Start the EV kit software by clicking its icon in the

Windows Start menu.

8) Refer to the companion EV kit’s documentation for fur-

ther instructions demonstrating its custom software.

Detailed Description of Hardware

The low-voltage RISC microcontroller, MAXQ2000-RAX

(U1), processes commands sent by a program running

on the PC. Each particular EV kit has its own custom

software specific to that kit.

The FTDI FT232BM (U2) provides the USB engine. The

USB 5V power is regulated down to 3.3V by U11 and

down to 2.5V by U3. LED1 indicates USB 5V power is pre-

sent. LED2, LED3, LED4 are general-purpose indicators.

Level translators U6–U10 convert the MAXQ2000’s

2.5V logic signals to the external VDD logic level, which

is jumper-selectable for 2.5V, 3.3V, or 5V logic. U9, the

MAX3372, is a bidirectional level translator specially

designed for the I2C bus. DIP switch SW1 optionally

disables the on-board 1.5kΩ termination resistors,

allowing the use of external, user-supplied I2C pullup

resistors. Level translator U10 is designed for SPI.

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