MAX5422EVKIT_技术文档

19-4171; Rev 0; 6/08

MAX5422 Evaluation Kit

Evluates:3/MAX524

General Description

Features

♦ Power-On Recall of Wiper Position from

The MAX5422 evaluation kit (EV kit) is an assembled

and tested PCB that evaluates the MAX5422 IC. The

MAX5422 is a 50kΩ 256-tap, nonvolatile, linear digital

potentiometer communicating over SPI™. The

MAX5422 features an internal nonvolatile EEPROM

used to store the potentiometer’s wiper position for ini-

tialization during power-up. The EEPROM is pro-

grammed through the SPI-compatible serial interface,

communicating at data rates up to 5MHz. The SPI sig-

nals can be transmitted through an on-board USB inter-

face circuit using a computer or a user-supplied SPI

bus along with PCB headers on the EV kit.

Nonvolatile Memory

♦ 2.7V to 5.25V Single-Supply Operation

♦ On-Board USB Interface Circuit for SPI-

Compatible Signals

♦ Proven USB-PC Connection for Power and

Control (USB Cable Included)

♦ Main Circuit Breakout Board

♦ PCB Headers for User-Supplied SPI-Compatible

Signals

The EV kit also features Windows 2000/XP/Vista^®-com-

patible software that provides a professional user inter-

face for exercising the MAX5422’s features. The program

is menu driven and offers a graphical user interface

(GUI) complete with buttons, track bars, and spin boxes.

♦ PCB Pads for Potentiometer Signals L, W, and H

♦ Evaluates the MAX5422ETA/MAX5423ETA/

MAX5424ETA in 3mm x 3mm x 0.8mm, 8-Pin

TDFN Package

The MAX5422 IC is powered from a 3.3V source gener-

ated from the EV kit’s USB interface circuit, or an exter-

nal user-supplied 2.7V to 5.25V DC power supply. The

MAX5422 section can be broken out from the EV kit,

allowing the MAX5422 to be attached to the user appli-

cations with minimal additional circuit area.

♦ Windows 2000/XP/Vista (32-Bit)-Compatible

Software

♦ Fully Assembled and Tested

Ordering Information

The EV kit can also evaluate the MAX5423 (100kΩ)

or MAX5424 (200kΩ) after IC replacement (U1). The

MAX5422 EV kit is shipped with a MAX5422ETA+

IC installed.

PART

TYPE

MAX5422EVKIT+

EV Kit

+Denotes lead-free and RoHS compliant.

SPI is a trademark of Motorola, Inc.

Windows Vista is a registered trademark of Microsoft Corp.

Component List

DESIGNATION QTY

DESCRIPTION

DESIGNATION QTY

DESCRIPTION

0.1µF 10ꢀ, 16V X7R ceramic

capacitors (0603)

Murata GRM188R71C104K or

TDK C1608X7R1C104K

22pF 5ꢀ, 50V C0G ceramic

capacitors (0603)

Murata GRM1885C1H220J or

TDK C1608C0G1H220J

C1, C3–C10,

15

C18, C19

C20

2

1

C17, C21–C25

10µF 20ꢀ, 6.3V X5R ceramic

capacitors (0805)

Murata GRM21BR60J106M or

TDK C2012X5R0J106M

3300pF 10ꢀ, 50V X7R ceramic

capacitor (0603)

Murata GRM188R71H332K or

TDK C1608X7R1H332K

C2, C13, C15

C11, C12

3

2

3

10pF 5ꢀ, 50V C0G ceramic

capacitors (0603)

Murata GRM1885C1H100J or

TDK C1608C0G1H100J

Green LED (0603)

Panasonic LNJ314G8TRA

D1

1

0

Not installed, ferrite bead inductor

(0603)

FB1

1µF 10ꢀ, 10V X5R ceramic

capacitors (0603)

Murata GRM188R61A105K or

TDK C1608X5R1A105K

J1, J2

JU1, JU2

JU3

2

1

2 x 6-pin headers

3-pin headers

2-pin header

C14, C16, C26

________________________________________________________________ Maxim Integrated Products

1

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.

MAX5422 Evaluation Kit

Component List (continued)

DESIGNATION QTY

DESCRIPTION

DESIGNATION QTY

DESCRIPTION

6MHz crystal

Hong Kong X’tals

USB type-B right-angle male

receptacle

P1

1

Y2

1

SSL6000000E18FAF

R1

R2

1

2

0Ω 5ꢀ resistor (0603)

220Ω 5ꢀ resistor (0603)

10kΩ 5ꢀ resistor (0603)

2.2kΩ 5ꢀ resistor (0603)

1.5kΩ 5ꢀ resistor (0603)

27Ω 5ꢀ resistors (0603)

—

8

1

Shunts

—

PCB: MAX5422 Evaluation Kit+

R3

*EP = Exposed pad.

R4

R5

R6, R7

Component Suppliers

256-tap digital potentiometer

(8 TDFN-EP*)

Maxim MAX5422ETA+

(Top Mark: AIJ)

SUPPLIER

PHONE

WEBSITE

U1

1

Hong Kong

X'tals Ltd.

852-35112388 www.hongkongcrystal.com

770-436-1300 www.murata-northamerica.com

32-bit microcontroller (68 QFN-EP*)

Maxim MAXQ2000-RAX+

Murata Electronics

North America, Inc.

U2

1

U3

U4

1

93C46 type 3-wire EEPROM (8 SO)

UART-to-USB converter (32 TQFP)

Panasonic Corp. 800-344-2112 www.panasonic.com

TDK Corp. 847-803-6100 www.component.tdk.com

3.3V regulator (5 SC70)

Maxim MAX8511EXK33+

(Top Mark: AEI)

Note: Indicate that you are using the MAX5422, MAX5423, or

MAX5424 when contacting these component suppliers.

U5

U6

1

2.5V regulator (5 SC70)

Maxim MAX8511EXK25+

(Top Mark: ADV)

MAX5422 EV Kit Files

Dual 1.8V to 5V level translator

(8 SSOP)

FILE

INSTALL.EXE

MAX5422.EXE

FTD2XX.INF

DESCRIPTION

Installs the EV kit files on the computer

Application program

U7

U8

1

Single 1.8V to 5V level translator

(6 SOT23)

USB driver file

16MHz crystal

Hong Kong X’tals

SSM1600000E18FAF

UNINST.INI

Uninstalls the EV kit software

USB driver installation help file

Y1

1

USB_Driver_Help.PDF

Procedure

Quick Start

Required Equipment

Before beginning, the following equipment is needed:

Evluates:3/MAX524

The MAX5422 EV kit is fully assembled and tested.

Follow the steps below to verify board operation:

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

the latest version of the EV kit software,

5422Rxx.ZIP. Save the EV kit software to a tempo-

rary folder and uncompress the ZIP file.

•

MAX5422 EV kit (USB cable included)

A user-supplied Windows 2000/XP/Vista PC with a

USB spare port

2) Install the EV kit software on the computer by

running the INSTALL.EXE program inside the

temporary folder. The program files are copied

and icons are created in the Windows Start |

Programs menu.

•

One ohmmeter

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.

2

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MAX5422 Evaluation Kit

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3) Verify that shunts are correctly installed on the follow-

ing jumpers and headers listed in the table below:

5) Connect the included USB cable from the PC to the

MAX5422 EV kit. A Building Driver Database win-

dow pops up in addition to a New Hardware

Found message when installing the USB driver for

the first time. If a window similar to the one

described above does not appear after 30s,

remove the USB cable from the board and recon-

nect it. Administrator privileges are required to

install the USB device driver on Windows

2000/XP/Vista.

SHUNT

POSITION

JUMPER

EV KIT FUNCTION

EV kit powered by the 3.3V gener-

ated from the USB interface circuit

JU1

1-2

Install on

H PCB pad is not connected to

JU2

JU3

one pin only VDD or the W PCB pad

6) 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\MAX5422 (default installation

directory) using the Browse button. During device

driver installation, Windows may show 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 proceed with

installation. Refer to the USB_Driver_Help.PDF doc-

ument included with the software if there are prob-

lems during this step.

Installed

L PCB pad is connected to GND

Connects 3.3V from USB interface

to MAX5422

J1 (1-2)

Installed

Connects VDD from MAX5422 to

USB interface

J1 (3-4)

J1 (5-6)

J1 (7-8)

J1 (9-10)

Installed

Connects SCLK from USB

interface to MAX5422

Connects DIN from USB interface

to MAX5422

Connects CS from USB interface

to MAX5422

J1 (11-12) Not installed Shunt not required

7) Start the MAX5422 EV kit software by opening its

icon in the Start | Programs menu.

J2 (1-2)

J2 (3-4)

8) Observe as the program automatically detects the

USB connection and starts the main program. After

successful connection, the EV kit software main

window appears in the upper-left corner of the win-

dow (Figure 1).

Do not install shunts on these

pins; shunts will short the power

and signal lines to ground

J2 (5-6)

J2 (7-8)

J2 (9-10)

Not installed

J2 (11-12) Not installed Shunt not required

9) The MAX5422 EV kit is ready for additional testing.

See the Detailed Description of Software section for

more information on the software features.

4) Connect the ohmmeter across the W and L PCB

pads.

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3

MAX5422 Evaluation Kit

The software divides EV kit functions into logical blocks.

The Interface group box indicates the EV kit Status

and the last write operation Command Sent and Data

Sent indicators. This data is used to confirm proper

device operation. The Potentiometer Control group

box changes the wiper position, stores the wiper posi-

tion from the volatile memory to the nonvolatile memory,

and recalls the wiper position from the nonvolatile mem-

ory to the volatile memory. The bottom status bar of

the main window provides the USB interface circuit

communication status. The Factory Default button pro-

grams the volatile and nonvolatile memory of the poten-

tiometer to midscale position.

Detailed Description of Software

Graphic User Interface (GUI) Panel

The MAX5422 EV kit software GUI shown in Figure 1 is

a Windows program that provides a convenient means

to control the MAX5422. Use the mouse or press the

tab key to navigate through the GUI controls. The cor-

rect SPI write operation is generated to update the

MAX5422 internal memory registers when any of these

controls are executed.

Software Startup

Upon startup, the MAX5422 EV kit software automati-

cally searches for the USB interface circuit connection.

The MAX5422 EV kit enters the normal operating mode

when the USB connection is detected. The nonvolatile

memory wiper position is then transferred to the volatile

memory. Since the MAX5422 does not have read capa-

bility, all the spin boxes are set to question marks “??”

and the track bar is set to midscale. If the USB connec-

tion is not detected, the software prompts the user to

retry, exit the program, or enter the demo mode.

Demo Mode

The MAX5422 EV kit software enters the demo mode,

when the USB connection is not detected, by selecting

Cancel on the MAX5422 Evaluation Kit Interface

Circuit popup window (Figure 2). The software can also

enter demo mode at any time by selecting Options |

Demo Mode from the menu bar in the main window.

When in demo mode, all software communication to the

EV kit circuit is disabled; however, most of the software

GUI is functional. Demo mode allows the user to evaluate

the software without hardware connectivity. To exit demo

mode, select Options | Demo Mode from the menu bar.

Figure 1. MAX5422 Evaluation Kit Software Main Window

Evluates:3/MAX524

Figure 2. MAX5422 Evaluation Kit Interface Circuit Popup Window

4

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MAX5422 Evaluation Kit

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end point. When writing to the nonvolatile memory, the

volatile memory and wiper position remain unchanged.

Wiper Position

The Wiper Position track bar in the Potentiometer

Control group box is used to change the wiper position

between the H and L end points. Use the computer

mouse or arrow keys to move the Wiper Position

between the 256 position points. The wiper position can

also be changed by entering a numerical value

between 0 and 255 into the H-W Volatile or L-W

Volatile spin boxes, or by pressing the up or down

arrows of these spin boxes. A change in the Wiper

Position track bar, or H-W Volatile/L-W Volatile spin

boxes write to the volatile memory and the wiper posi-

tion is updated with the data sent. The data in the non-

volatile memory remains unchanged. The wiper position

is shown in the H-W Volatile and L-W Volatile spin

boxes. The H-W Volatile spin box shows the wiper

position with respect to the H end point and the L-W

Volatile spin box shows the wiper position with respect

to the L end point. During EV kit power-up, the wiper-

position data in the nonvolatile memory is transferred to

the volatile memory and the position of the wiper is

updated. The H-W Volatile, L-W Volatile, H-W

Nonvolatile, and L-W Nonvolatile spin boxes display

“??” after initializing the EV kit software because the

MAX5422 does not transmit data to the master.

Volatile/Nonvolatile Data Transferring

The Potentiometer Control group box contains the

Store and Recall buttons used to transfer data from the

volatile memory to the nonvolatile memory and the non-

volatile memory to the volatile memory, respectively.

When the Store button is pressed, the data present in

the volatile memory is transferred to the nonvolatile

memory. When the Recall button is pressed, the data

present in the nonvolatile memory is transferred to the

volatile memory, and the wiper position is updated. The

Store and Recall buttons do not send any new data to

the device because the commands transferred data

already contained in the volatile or nonvolatile memory.

Factory Default

Pressing the Factory Default button resets the wiper

position in the MAX5422 volatile and nonvolatile memo-

ry to the factory-default position. The factory-default

wiper position is the midscale position.

Status Indicator

The Status indicator in the Interface group box dis-

plays EV Kit Operational when the MAX5422 EV kit

enters the normal operating mode after the USB con-

nection is detected. When USB connection is not

detected, or when the software enters the demo mode,

the Status indicator displays Demo Mode.

Nonvolatile Programming

The H-W Nonvolatile and L-W Nonvolatile spin boxes

in the Potentiometer Control group box are used to

program the nonvolatile memory of the digital poten-

tiometers. The nonvolatile memory is changed by enter-

ing a numerical value between 0 and 255 into the H-W

Nonvolatile or L-W Nonvolatile spin boxes. The H-W

Nonvolatile spin box shows the wiper position with

respect to the H end point and the L-W Nonvolatile

spin box shows the wiper position with respect to the L

Command Sent Indicator

The Command Sent indicator in the Interface group

box displays the last command sent from the master

(software) to the MAX5422. There are four commands

available in the MAX5422 IC. Table 1 describes the four

MAX5422 commands.

Table 1. MAX5422 SPI Command

COMMAND

MAX5422 EV KIT

DESCRIPTION

MAX5422 REGISTER

SOFTWARE CONTROL

BINARY

HEX

SPI data is written to VREG

Wiper position updates with SPI data

No change to NVREG

H-W Volatile

L-W Volatile

VREG

00000000

0x00

SPI data is written to NVREG

No change to wiper position

No change to VREG

H-W Nonvolatile

L-W Nonvolatile

NVREG

00010000

00100000

00110000

0x10

0x20

0x30

Copy VREG to NVREG

No change to wiper position

No change to VREG

VREGxNVREG

NVREGxVREG

Store

Copy NVREG to VREG

Wiper position updates with NVREG

No change to NVREG

Recall

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5

MAX5422 Evaluation Kit

The Connection group box allows the user to define the

hardware connections of the interface. For the

MAX5422 EV kit, select K10 from the Clock (SCK)

(SCLK) drop-down list, K12 from the Data from master

to slave (MOSI) (DIN) drop-down list, K11 from the

Data from slave to master (MISO) (DOUT) drop-down

list, K9 from the Chip-select (CS) for data framing

drop-down list, and uncheck the Use standard connec-

tions for high-speed SPI checkbox (see Figure 3).

Data Sent Indicator

The Data Sent indicator in the Interface group box dis-

plays the last data sent from the master (software) to

the MAX5422. The Data Sent indicator displays the last

data sent for the write to VREG (0x00) command and

the write to NVREG (0x10) command. Since the

VREGxNVREG (0x20) and the NVREGxVREG (0x30)

commands do not send any new data to the MAX5422,

the Data Sent indicator is hidden when these two com-

mands are executed.

The Configuration group box allows the user to config-

ure the logic level and data rate. For the MAX5422 EV

kit, check the Send & Receive MSB first and the

CPOL=1 (clock idle high) checkboxes (see Figure 3).

The MAX5422 IC uses an 8-bit (MSBs, D7–D0) data

byte to set the wiper position. Refer to the MAX5422/

MAX5423/MAX5424 IC data sheet for additional

information.

The Send and Receive Data group box allows the user

to send and receive data to and from the MAX5422.

The Data bytes to be written edit box is data to be

sent from the master (microcontroller) to the device

(MAX5422). Eight-bit hexadecimal numbers should be

comma delimited. Press the Send Now button to trans-

mit the data from the master to the device. Data

appearing in the Data bytes received edit box is data

read from the device. The Data bytes received edit

box in the MAX5422 EV kit software always shows a

default value of 0xFF since the MAX5422 does not

send data back to the master.

Keyboard Navigation

Press the Tab key to select each GUI control. The

selected control is indicated by a dotted outline. Using

Shift + Tab moves the selection to the previously select-

ed control. Buttons respond to the keyboard’s space

bar and 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

desired menu item. Most menu items have one letter

underlined, indicating their shortcut key.

When a number is entered into the volatile or non-

volatile text boxes, it can be sent to the device by

pressing the Enter key. It is also sent when Tab or Shift

+ Tab is pressed.

Note: The SPI dialog boxes accept numeric data in

hexadecimal format. Hexadecimal numbers must be

prefixed by $ or 0x. See Figure 3 for an example of

this tool. Figure 3 shows a simple SPI write-byte oper-

ation using the included 3-wire interface diagnostics

tool. In this example, the software is sending a com-

mand 0x00 (write to volatile memory), and a data

0x7F. The data sequence sets the MAX5422 wiper

position to 128.

Simple SPI Commands

There are two methods for communicating with the

MAX5422 EV kit, through the normal user-interface

panel (Figure 1) or through the SPI commands avail-

able by selecting the 3-Wire Interface (Figure 3) utility

from the main program’s Options | Interface

(Advanced Users) main menu. A window is displayed

that allows SPI send/receive data operations.

Evluates:3/MAX524

6

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MAX5422 Evaluation Kit

Evluates:3/MAX524

Figure 3. Simple Low-Level 3-Wire Interface

General Troubleshooting

Detailed Description of Hardware

Problem: Software reports it cannot find the inter-

face circuit.

The MAX5422 EV kit is an assembled and tested PCB

that evaluates the MAX5422 256-tap, nonvolatile, linear

digital potentiometer. The MAX5422 has an end-to-end

resistance of 50kΩ and the wiper can be programmed

to one of 256 tap positions. The MAX5422 features an

internal, nonvolatile memory (EEPROM) used to store

the wiper position for initialization during power-up. The

MAX5422 EV kit provides an on-board SPI-compatible

serial interface to program the MAX5422.

•

Is the interface circuit power LED lit?

Is the USB cable connected?

Has Windows plug-and-play detected the board?

Bring up Control Panel->System->Device

Manager, and look at what device nodes are indi-

cated for USB. If there is an Unknown device node

attached to the USB, delete it—this forces plug-

and-play to try again.

The EV kit uses a MAX5422 IC in an 8-pin TDFN pack-

age on a proven two-layer PCB design. The MAX5422

EV kit provides two options to power the MAX5422 IC. It

can operate from the 3.3V supply generated from the

USB interface circuit, or from a user-supplied 2.7V to

5.25V external DC power supply. The logic level trans-

lators (U7, U8) provide proper SPI-interface operation

when using a 2.7V to 5.25V external power supply.

•

Are jumper JU1 and headers J1 and J2 properly

configured for USB operation? See Tables 2 and 3.

_______________________________________________________________________________________

7

MAX5422 Evaluation Kit

The MAX5422 main circuit area consists of the

MAX5422 IC U1, decoupling capacitors C25 and C26,

jumpers JU1, JU2, and JU3, header J2, and PCB pads

H, W, L, VCC, and GND. The MAX5422 main circuit

PCB section is less than 1.2in x 1.1in and can be sepa-

rated from the EV kit using the cutout slots, allowing the

MAX5422 to be conveniently attached to a user appli-

cation. After separation, the two parts of the EV kit can

be reconnected using a short cable. A short ribbon

cable of about 3in is recommended to reconnect the

MAX5422 EV kit. A Samtec IDSS-06-D-3.00 ribbon

cable can be used to connect header J1 odd pins to

header J2 odd pins.

Table 2. JU1 Jumper Functions (VDD)

SHUNT

POSITION

V

DD

PIN CONNECTED

TO

EV KIT POWERED

FROM

1-2*

3.3V

USB interface circuit

External power supply

(2.7V to 5.25V)

2-3

V

CC

Do not use (EV kit is

not powered)

Open

Not connected

*Default position.

SPI Clock and Data/Chip Select Inputs

The MAX5422 features a clock and data/chip select input

pins for SPI-compatible communication to control the

MAX5422 wiper position and transfer data between volatile

and nonvolatile memories. The clock and data/chip select

pins can be driven by the on-board USB interface circuit

or the PCB header (J2), along with a user-supplied exter-

nal SPI-compatible controller. An external SPI-compatible

controller can be connected to the SCLK (J2-6), DIN (J2-

8), CS (J2-10), and GND (J2-12) on header J2 to commu-

nicate with the MAX5422 IC. When using an external SPI-

compatible controller, disconnect the on-board USB inter-

face circuit by removing all the shunts from header J1.

Jumper Selection

Using an External DC Power Supply

The MAX5422 EV kit can be powered by an external

2.7V to 5.25V DC power supply. The EV kit can still be

programmed through the USB interface using the soft-

ware GUI. To connect the EV kit to an external power

supply, disconnect the USB cable and install a shunt

on pins 2-3 of jumper JU1. Turn off the power supply

and connect the power-supply ground terminal to the

EV kit GND pad, and the power-supply positive terminal

to the VCC pad. Table 2 lists the various options for

powering the MAX5422 EV kit.

Headers J1 and J2 select the SPI serial-interface signal-

control sources for the MAX5422 IC. Table 3 lists the

various options for configuring SPI input signal controls.

Table 3. J1, J2 Header Functions (+3.3V, VDD, SCLK, DIN, CS, GND)

HEADER POSITION

SHUNT POSITION

Installed*

EV KIT FUNCTION

Connects +3.3V from USB interface to MAX5422

Disconnect +3.3V from USB interface to MAX5422

Connects VDD from MAX5422 to USB interface

Disconnect VDD from MAX5422 to USB interface

Connects SCLK from USB interface to MAX5422

Disconnect SCLK from USB interface to MAX5422

Connects DIN from USB interface to MAX5422

Disconnect DIN from USB interface to MAX5422

Connects CS from USB interface to MAX5422

Disconnect CS from USB interface to MAX5422

Shunt not required

J1 (1-2)

Not installed

Installed*

J1 (3-4)

J1 (5-6)

J1 (7-8)

J1 (9-10)

Not installed

Installed*

Not installed

Installed*

Evluates:3/MAX524

Not installed

Installed*

Not installed

J1 (11-12)

J2 (1-2)

J2 (3-4)

Do not install shunts on these pins. Shunts will short the power and signal

lines to ground.

J2 (5-6)

Not installed

J2 (7-8)

J2 (9-10)

J2 (11-12)

*Default position.

Shunt not required

8

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MAX5422 Evaluation Kit

Evluates:3/MAX524

Potentiometer, Voltage-Divider, or

Variable Resistor, with Ground Reference

The MAX5422 EV kit provides an option to configure the

MAX5422 as a potentiometer, voltage-divider, or vari-

able resistor—open end(s), or with ground reference

using jumpers JU2 and JU3. Table 4 lists the various

JU2 and JU3 jumper options.

Note that to test the device in resistor mode, the ohmme-

ter must be ground referenced to the MAX5422 by con-

necting the L pin to GND or the H pin to VDD.

Resistance can then be measured between W and L or

W and H.

Evaluating the MAX5423ETA/MAX5424ETA

The MAX5422 EV kit can also evaluate the

MAX5423ETA or the MAX5424ETA. Remove the

MAX5422ETA IC (U1) and replace it with the desired IC.

The MAX5423ETA and MAX5424ETA ICs are pin and

functional compatible with the MAX5422ETA IC. Refer to

the MAX5422/MAX5423/MAX5424 IC data sheet

for a complete description of part-to-part differences.

Warning: When operating as a variable resistor (jumper

JU2 shunts on pins 2-3), any power source connected

to the H, W, or L pad must be voltage and current limit-

ed to the absolute maximum conditions stated in the

MAX5422/MAX5423/MAX5424 IC data sheet.

Table 4. JU2 and JU3 Jumper Functions (L Signal and GND)

SHUNT POSITION

H PAD

L PAD

MAX5422 FUNCTION

Potentiometer open ends

JU2

JU3

Not installed*

Installed

Not connected

Not installed*

Not connected

Connected to GND Potentiometer with ground reference

Not connected Voltage-divider open end

Connected to GND Voltage-divider with ground reference

Not connected Variable resistor open ends

Connected to GND Variable resistor with ground reference

Not installed

Installed

1-2

Connected to VDD

Connected to W pad

Not installed

Installed

2-3**

*Default position.

**Any power source connect to the H or W pad must be current limited.

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9

MAX5422 Evaluation Kit

Evluates:3/MAX524

Figure 4a. MAX5422 EV Kit Schematic (Sheet 1 of 2)

10 ______________________________________________________________________________________

MAX5422 Evaluation Kit

Evluates:3/MAX524

Figure 4b. MAX5422 EV Kit Schematic (Sheet 2 of 2)

______________________________________________________________________________________ 11

MAX5422 Evaluation Kit

Figure 5. MAX5422 EV Kit Component Placement Guide—

Component Side

Figure 6. MAX5422 EV Kit PCB Layout—Component Side

Evluates:3/MAX524

12 ______________________________________________________________________________________

MAX5422 Evaluation Kit

Evluates:3/MAX524

Figure 7. MAX5422 EV Kit PCB Layout—Solder Side

Figure 8. MAX5422 EV Kit Component Placement Guide—

Solder Side

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.


型号：	MAX5422EVKIT
厂家：	MAXIM INTEGRATED PRODUCTS
描述：	Power-On Recall of Wiper Position from Nonvolatile Memory
文件：	总13页 (文件大小：229K)
中文：	中文翻译
下载：	下载PDF数据表文档文件

MAX5422EVKIT [MAXIM]

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