MAX5498EVKIT [MAXIM]

2.7V to 5.25V Single-Supply Operation;


型号：	MAX5498EVKIT
厂家：	MAXIM INTEGRATED PRODUCTS
描述：	2.7V to 5.25V Single-Supply Operation
文件：	总13页 (文件大小：313K)
中文：	中文翻译
下载：	下载PDF数据表文档文件

19-4161; Rev 1; 12/08

MAX5498 Evaluation Kit

Evluates:–MAX549

General Description

Features

o 2.7V to 5.25V Single-Supply Operation

The MAX5498 evaluation kit (EV kit) is an assembled

and tested PCB that demonstrates the MAX5498 10-bit

(1024-tap), dual, nonvolatile, SPI™-interface, linear-

taper digital potentiometer. Windows^®2000/XP- and

Windows Vista^®-compatible software provides a handy

user interface to exercise the features of the MAX5498.

o Power-On Recall of Wiper Position from

Nonvolatile Memory

o On-Board USB Interface Circuit

o USB Powered

o USB-PC Connection (Cable Included)

o PCB Pads for User-Supplied Microcontroller

The EV kit can also be used to evaluate the MAX5494,

MAX5495, MAX5496, MAX5497, or MAX5499. The

MAX5494/MAX5495 provide two programmable volt-

age-dividers, the MAX5496/MAX5497 provide two vari-

able resistors, and the MAX5498/MAX5499 provide one

programmable voltage-divider and one variable resistor.

The MAX5494/MAX5496/MAX5498 devices have 10kΩ

end-to-end resistance and the MAX5495/MAX5497/

MAX5499 devices have 50kΩ end-to-end resistance.

To evaluate the MAX5494–MAX5497 or MAX5499,

request a free sample (ETE+ suffix) along with the

MAX5498 EV kit.

Interface Signals

o Labeled Test Points for Potentiometer Signals

(L, W, and H)

o Proven USB-Compatible PCB Layout

o Evaluates MAX5494–MAX5499

o Windows 2000/XP- and Windows Vista

(32-Bit)-Compatible Software

o Lead(Pb)-Free and RoHS Compliant

o Fully Assembled and Tested

Ordering Information

PART

TYPE

SPI is a trademark of Motorola, Inc.

MAX5498EVKIT+

EV Kit

Windows and Windows Vista are registered trademarks of

Microsoft Corp.

+Denotes lead(Pb)-free and RoHS compliant.

Component List

DESIGNATION QTY

DESCRIPTION

DESIGNATION QTY

DESCRIPTION

0.1µF 10ꢀ, 16V X7R ceramic

capacitors (0603)

TDK C1608X7R1C104K

Murata GRM188R71C104K

1µF 10ꢀ, 16V X5R ceramic

capacitor (0603)

TDK C1608X5R1C105K

Murata GRM188R61C105K

C1, C4–C8,

C14

C12, C17, C19

10µF 20ꢀ, 16V X5R ceramic

capacitors (1206)

Murata GRM31CR61C106M or

TDK C3216X5R1C106M

10pF 5ꢀ, 50V C0G ceramic

capacitors (0603)

Murata GRM1885C1H100J or

TDK C1608C0G1H100J

C2, C13, C15

C16, C18

Green LED (0805)

Not installed, ceramic capacitor

(0603)

70Ω, 4A ferrite bead (0603)

TDK MMZ1608R301A

Murata BLM18SG700 TN1

FB1

0.033µF 10ꢀ, 16V (min) X5R

ceramic capacitor (0603)

Murata GRM188R71E333K

TDK C1608X7R1E333K

J1, J2

4-pin headers, 0.1in centers

Not installed, dual-row (2 x 6) 12-pin

header, 0.1in centers

22pF 5ꢀ, 50V C0G ceramic

capacitors (0603)

Murata GRM1885C1H220J or

TDK C1608C0G1H220J

Not installed, dual-row (2 x 5) 10-pin

JTAG header, 0.1in centers

C10, C11

________________________________________________________________ Maxim Integrated Products

For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,

or visit Maxim’s website at www.maxim-ic.com.

MAX5498 Evaluation Kit

Component List (continued)

DESIGNATION QTY

DESCRIPTION

DESIGNATION QTY

DESCRIPTION

JU1, JU2

3-pin headers, 0.1in centers

Microcontroller (68 QFN-EP*)

Maxim MAXQ2000-RAX+

USB series-B right-angle PC-mount

receptacle

LDO regulator (5 SC70)

Maxim MAX8511EXK25+

R1, R2

27Ω 5ꢀ resistors (0603)

1.5kΩ 5ꢀ resistor (0603)

470Ω 5ꢀ resistors (0603)

2.2kΩ 5ꢀ resistor (0603)

10kΩ 5ꢀ resistor (0603)

0Ω resistors (0603)

USB-to-UART converter (32 TQFP)

FTDI FT232BL

R4, R7

93C46 type 3-wire EEPROM (8 SO)

Atmel AT93C46A-10SU-2.7

—

16MHz crystal

R8, R17

R9, R10, R11

Not installed, 32.768kHz crystal

6MHz crystal

Not installed, resistors (0603)

Not installed, resistors—short (PC

trace) (0402)

R12–R16

Shunts

10-bit (1024-tap), dual linear-taper

digital potentiometer (16 TQFN-EP*)

Maxim MAX5498ETE+

PCB: MAX5498 Evaluation Kit+

*EP = Exposed pad.

Low-voltage level translator (14 TSSOP)

Maxim MAX3390EEUD+

Component Suppliers

SUPPLIER

PHONE

WEBSITE

Murata Electronics North America, Inc.

TDK Corp.

770-436-1300

847-803-6100

www.murata-northamerica.com

www.component.tdk.com

Note: Indicate that you are using the MAX5498, MAX5494–MAX5497, or MAX5499 when contacting these component suppliers.

Evluates:–MAX549

MAX5498 EV Kit Files

FILE

INSTALL.EXE

MAX5498.EXE

FTD2XX.INF

DESCRIPTION

Installs the EV kit files on your computer

Application program

USB device driver file

UNINST.INI

Uninstalls the EV kit software

USB driver installation help file

USB_Driver_Help.PDF

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

underlined refers to items from the Windows operating

system.

Quick Start

Recommended Equipment

Before beginning, the following equipment is needed:

•

MAX5498 EV kit (USB cable included)

A user-supplied Windows 2000/XP- or Windows

Vista-compatible PC with a spare USB port

•

Two ohmmeters

_______________________________________________________________________________________

MAX5498 Evaluation Kit

Evluates:–MAX549

Procedure

The MAX5498 EV kit is fully assembled and tested.

Follow the steps below to verify board operation.

Caution: Do not turn on the power (insert USB cable

into computer) until all connections are completed.

Table 1. Default Jumper Settings

SHUNT

POSITION

JUMPER

J1, J2

JU1

DESCRIPTION

Provides a ground reference for

resistor mode measurements

3-4

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

load the latest version of the EV kit software,

5498Rxx.ZIP. Save the EV kit software to a tempo-

rary folder and uncompress the ZIP file.

EV kit powered from USB bus voltage

(5V)

1-2

2-3

VSS tied to GND (single-supply

operation)

JU2

2) Install the EV kit software on your computer by run-

ning the INSTALL.EXE program inside the tempo-

rary folder. The program files are copied and icons

are created in the Windows Start | Programs

menu.

Detailed Description of Software

The MAX5498 EV kit software graphical user interface

(GUI) is a Windows program that provides a convenient

means to control the MAX5498 (Figure 1).

3) Ensure that the MAX5498 EV kit board’s jumper set-

tings are correct (see Table 1 for jumper settings).

4) Connect one of the ohmmeters across the W1 and

L1 pads.

Factory Reset

Pressing the Factory Reset button returns wipers 1

and 2 (and the nonvolatile memory) to the midscale tap

position.

5) Connect the other ohmmeter across the W2 and L2

pads.

6) Connect the USB cable from the PC to the EV kit. A

Building Driver Database window pops up in addi-

tion to a New Hardware Found message when

installing the USB driver for the first time. If a win-

dow that is similar to the one described above is not

seen after 30s, remove the USB cable from the

board and reconnect it. Administrator privileges are

required to install the USB device driver on

Windows 2000 and XP. Refer to Application Note

3601: Troubleshooting Windows Plug-and-Play and

USB for Maxim Evaluation Kits if any problems arise

during this step.

Wipers 1 and 2 Position

In the Channel 1 group box, set the tap value (either by

typing the decimal tap number into one of the edit

boxes or by moving the track bar), and then press the

Write button.

In the Channel 2 group box, set the tap value (either by

typing the decimal tap number into one of the edit

boxes or by moving the track bar), and then press the

Write button.

As confirmation, the Command History window shows

the executed SPI sequence. The first hex value is the

command byte sent to the device and the next two hex

values correspond to the W-L tap value (e.g., SPI: 0x01,

0x80, 0x00).

7) Follow the directions of the Add New Hardware

Wizard to install the USB device driver. Choose the

Search for the best driver for your device option.

Specify the location of the device driver to be

C:\Program Files\MAX5498 (default installation direc-

tory) using the Browse button. 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 condi-

tion and it is safe to proceed with the installation.

Nonvolatile Programming

In the Channel 1 group box, set the tap value (either by

typing the decimal tap number into one of the edit

boxes or by moving the track bar), and then press the

Write NV button.

In the Channel 2 group box, set the tap value (either by

typing the decimal tap number into one of the edit

boxes or by moving the track bar), and then press the

Write NV button.

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

Windows Start menu.

9) The software automatically searches for the

MAX5498. After successful connection, MAX5498

EV Kit connected is displayed in the lower-left cor-

ner of the EV kit main window, as shown in Figure 1.

Move the Channel 1 or Channel 2 track bars and

press the Write button to set the wiper position.

As confirmation, the Command History group box

diaplays the executed SPI sequence. The first hex

value is the command byte sent to the device and the

next two hex values correspond to the W-L tap value

(e.g., SPI: 0x11, 0x80, 0x00).

_______________________________________________________________________________________

MAX5498 Evaluation Kit

In the Channel 1 group box, copy the active tap value

to nonvolatile memory by pressing the Load NV

active button. As confirmation, the Command History

group box displays SPI sequence 0x31.

Volatile/Nonvolatile Data Transfer

In the Channel 1 group box, copy the active tap value

to nonvolatile memory by pressing the Save active

NV button. As confirmation, the Command History

group box displays SPI sequence 0x21.

In the Channel 2 group box, copy the active tap value

to nonvolatile memory by pressing the Load NV

active button. As confirmation, the Command History

group box displays SPI sequence 0x32.

In the Channel 2 group box, copy the active tap value

to nonvolatile memory by pressing the Save active

NV button. As confirmation, the Command History

group box displays SPI sequence 0x22.

To copy both the active tap values to nonvolatile memo-

ry, press the Copy Both NV Registers to Wiper

Registers button. As confirmation, the Command

History group box displays SPI sequence 0x33.

To copy both of the active tap values to nonvolatile

memory, press the Copy Both Wiper Registers to NV

Registers button. As confirmation, the Command

History group box displays SPI sequence 0x23.

Evluates:–MAX549

Figure 1. MAX5498 EV Kit Main Window

_______________________________________________________________________________________

MAX5498 Evaluation Kit

Evluates:–MAX549

Command History

The Command History group box displays the

sequence of bytes sent to the device for each of the

GUI’s button controls. For the write controls (Write and

Write NV), the group box displays the command byte fol-

lowed by the 2 data bytes (wiper setting). The 2 data

bytes correspond to the W-L tap value. For the save,

load, and copy controls the group box displays the asso-

ciated command byte. All values are displayed in hex.

Table 2. J1 and J2 Shunt Configuration

SHUNT

POSITION

DESCRIPTION

L terminals connected to GND (use

when measuring digital pot resistance)

3-4*

L1, L2

Not

installed

L terminals unconnected

*Default position.

Evaluating Other Devices

The MAX5498 EV kit software can also be used to

evaluate any of the other devices in the MAX5494–

MAX5499 family. The software is reconfigured for each

device by choosing the device number from the

Options | Device menu bar. To ensure proper opera-

tion, install the alternate device on the EV kit before

reconfiguring the software.

Evaluating the

MAX5494–MAX5497 or MAX5499

To evaluate the MAX5494–MAX5497 or MAX5499, con-

tact the factory for a free sample of the MAX5494ETE+,

MAX5495ETE+, MAX5496ETE+, MAX5497ETE+, or

MAX5499ETE+. Refer to the MAX5494–MAX5499 IC

data sheet for additional device information.

External User-Supplied SPI Interface

The MAX5498 EV kit can be modified for use with an

external user-supplied SPI interface. First, with power

off and USB disconnected, turn the board over and cut

the four traces that are on the back of the board, under-

neath location J3. Install a standard dual-row header

and connect an external SPI interface. See Figure 2a

for the J3 schematic and Figure 4 for J3 trace locations

on the bottom side of the PCB.

Keyboard Navigation

When you type on the keyboard, the system must know

which control should receive the keys. Press the Tab

key to move the keyboard’s focus from one control to

the next. The focused control is indicated by a dotted

outline. Shift + Tab moves the focus to the previously

focused control. Buttons respond to the keyboard’s

space bar. Some controls respond to the keyboard’s up

and down arrow keys. Activate the program’s menu bar

by pressing the F10 key, and then press the letter of the

menu item you want. Most menu items have one letter

underlined, indicating their shortcut key.

Single-Supply Operation (VDD)

The MAX5498 EV kit’s default configuration is for single-

supply operation. The USB interface and microcontroller

are powered from the USB bus voltage (5V). The device

under test can be powered from an external power sup-

ply (2.7V to 5.25V) connected between VDD and GND

(see Table 3). When operating with a single supply, the

VSS input should be connected to GND (Table 4).

Detailed Description of Hardware

As configured, the MAX5498 EV kit evaluates the

MAX5498 dual, linear-taper potentiometer with one

programmable voltage-divider and one variable resis-

tor. The potentiometer terminals are accessible from

headers H1 and H2. The MAX5498 EV kit hardware and

software can also be used to evaluate the MAX5494–

MAX5497 or MAX5499. The installed device is con-

trolled using a graphical user interface (GUI) that can

be downloaded by visiting www.maxim-ic.com/evkitsoft-

ware and clicking on the MAX5498 EVKIT software link.

Table 3. JU1 Jumper Functions

SHUNT

POSITION

SIGNAL

EV KIT FUNCTION

1-2*

Power device from USB 5V supply.

Do not use—device will not be powered.

Open

Ground Referencing Test Equipment

The L terminals of each digital pot are linked to ground

by placing a shunt on pins 3-4 of headers J1 and J2

(see Table 2). This provides a ground reference when

using nonground referenced test equipment (e.g.,

handheld digital multimeter).

VDD

Power device from external power

supply (2.7V to 5.25V) connected

between VDD and GND pads.

2-3

*Default position.

_______________________________________________________________________________________

MAX5498 Evaluation Kit

Dual-Supply Operation (VDD, VSS)

To evaluate the MAX5498 EV kit with dual supplies, dis-

connect the USB cable from the EV kit and configure

JU1 for external power-supply operation (Table 3) and

JU2 for dual-supply operation (Table 4). Connect the

positive supply between the VDD and GND pads and

the negative supply between the VSS and GND pads.

When evaluating the EV kit with dual supplies, ensure

that (VDD - VSS) ≤ 5.25V.

Table 4. JU2 Jumper Functions

SHUNT

POSITION

SIGNAL

EV KIT FUNCTION

Dual-supply operation. Connect

external supply (-2.5V to -0.2V)

between VSS and GND pads. Ensure

(VDD - VSS) ≤ 5.25V.

1-2

VSS

Open

2-3*

Do not use—device will not be powered.

Single-supply operation. VSS = GND.

*Default position.

Evluates:–MAX549

_______________________________________________________________________________________

MAX5498 Evaluation Kit

Evluates:–MAX549

Figure 2a. MAX5498 EV Kit Schematic (Sheet 1 of 3)

_______________________________________________________________________________________

MAX5498 Evaluation Kit

Evluates:–MAX549

Figure 2b. MAX5498 EV Kit Schematic (Sheet 2 of 3)

_______________________________________________________________________________________

MAX5498 Evaluation Kit

Evluates:–MAX549

Figure 2c. MAX5498 EV Kit Schematic (Sheet 3 of 3)

_______________________________________________________________________________________

MAX5498 Evaluation Kit

Evluates:–MAX549

Figure 3. MAX5498 EV Kit Component Placement Guide—Component Side

10 ______________________________________________________________________________________

MAX5498 Evaluation Kit

Evluates:–MAX549

Figure 4. MAX5498 EV Kit PCB Layout—Component Side

______________________________________________________________________________________ 11

MAX5498 Evaluation Kit

Evluates:–MAX549

Figure 5. MAX5498 EV Kit PCB Layout—Solder Side

12 ______________________________________________________________________________________

MAX5498 Evaluation Kit

Evluates:–MAX549

Revision History

REVISION REVISION

PAGES

CHANGED

DESCRIPTION

NUMBER

DATE

5/08

Initial release

—

Updated External User-Supplied SPI Interface section, deleted Figure 2, and

renumbered remaining figures.

12/08

5, 6–12

Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are

implied. Maxim reserves the right to change the circuitry and specifications without notice at any time.

Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 ____________________ 13

is a registered trademark of Maxim Integrated Products, Inc.

MAX5498EVKIT [MAXIM]

相关型号：

MAX5498EVKIT+

MAX5499

MAX5499ETE

MAX549A

MAX549AC/D

MAX549ACPA

MAX549ACUA

MAX549ACUA+

MAX549ACUA+T

MAX549ACUA-T

MAX549AEPA

MAX549AEUA