MAX5391LEVMINIQU [MAXIM]

PC-USB to 3-Wire Interface or Stand-Alone 3-Wire Serial-Interface Operation;


型号：	MAX5391LEVMINIQU
厂家：	MAXIM INTEGRATED PRODUCTS
描述：	PC-USB to 3-Wire Interface or Stand-Alone 3-Wire Serial-Interface Operation PC
文件：	总13页 (文件大小：1326K)
中文：	中文翻译
下载：	下载PDF数据表文档文件

19-5104; Rev 0; 12/09

MAX5391L/MAX5391N Evaluation Systems

General Description

Features

Sꢀ 1.7V_to_5.25V_Single-Supply_Operation

The MAX5391L and MAX5391N evaluation kits (EV kits)

are fully assembled and tested PCBs that feature the

MAX5391L (10kI) and MAX5391N (100kI) dual digital

potentiometers, respectively. The MAX5391L/MAX5391N

dual volatile potentiometers communicate through an

SPIK-compatible 3-wire serial interface.

Sꢀ PC-USB_to_3-Wire_Interface_or_Stand-Alone_3-Wire_

Serial-Interface_Operation

Sꢀ Easy-to-Use_Menu-Driven_Software

Sꢀ Includes_Windows_2000-,_Windows_XP-,_and_

Windows_Vista-Compatible_Software

The MAX5391LEVMINIQU+ and MAX5391NEVMINIQU+

evaluation systems (EV systems) include the MAX5391L

EV kit and MAX5391N EV kit, respectively, and a

MINIQUSB+ interface board. The MINIQUSB+ interface

board can be used to enable PC communication through

Sꢀ Fully_Assembled_and_Tested

Ordering Information

PART

TYPE

the USB interface. Windows 2000-, Windows XP -,

and Windows Vista -compatible software provides a

MAX5391LEVMINIQU+

MAX5391NEVMINIQU+

EV System

professional user interface for exercising the MAX5391L/

MAX5391N features. The program is menu-driven and

offers a graphical user interface (GUI) complete with

buttons, track bars, and edit boxes. The EV kit software

can be used to evaluate the MAX5386M, MAX5393, and

MAX5388. The EV kits can also be interfaced directly to

a user-supplied 3-wire system.

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

Component Lists

MAX5391L EV System

(MAX5391LEVMINIQU+)

PART

QTY

DESCRIPTION

EV kit

The MAX5391L/MAX5391N ICs can be powered from

a 1.7V, 2.6V, 3.3V, or 5V source generated from the

MINIQUSB+ interface board and EV kit circuitry, or a user-

supplied external 1.7V to 5.25V DC power supply. Order

the MAX5391LEVMINIQU+ or MAX5391NEVMINIQU+

EV system for a PC-based evaluation of the MAX5391L

or MAX5391N, respectively.

MAX5391LEVKIT+

MINIQUSB+

Maxim command module

MAX5391N EV System

(MAX5391NEVMINIQU+)

PART

QTY

DESCRIPTION

EV kit

Maxim command module

MAX5391NEVKIT+

MINIQUSB+

The EV kits also contain PCB footprints for the MAX5386M,

MAX5388, and MAX5393. To evaluate these parts,

order samples and install the ICs on U1, U4, and U3,

respectively.

MAX5391L/MAX5391N EV Kits

DESIGNATION QTY

DESCRIPTION

C1, C2, C3, C7,

C10, C11, C14,

C15, C19, C20,

C23, C24, C25

1FF Q10%, 16V X5R ceramic

capacitors (0603)

Murata GRM188R71C105K or

TDK C1608X5R1C105K

0.1FF Q10%, 50V X7R ceramic

capacitors (0603)

Murata GRM188R71H104K or

TDK C1608X7R1H104K

C4, C8,

C12, C16

C5, C6,

Not installed, ceramic capacitors

(0603)

C9, C13

10FF Q10%, 6.3V X5R ceramic

capacitor (0805)

Murata GRM21BR60J106K or

TDK C2012X5R0J106K

C26

SPI is a trademark of Motorola, Inc.

Windows, Windows XP, and Windows Vista are registered

trademarks of Microsoft Corp.

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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.

MAX5391L/MAX5391N Evaluation Systems

Component Lists (continued)

MAX5391L/MAX5391N EV Kits (continued)

DESIGNATION QTY

DESCRIPTION

2 x 4-pin header

DESIGNATION QTY

DESCRIPTION

Adjustable output LDO regulator

(5 SC70)

Maxim MAX8512EXK+

(Top Mark: ADW)

2 x 8-pin header

8-pin female receptacle

JU1, JU3–JU6,

JU8–JU18

2-pin headers

2.6V LDO regulator (5 SC70)

Maxim MAX8511EXK26+

(Top Mark: AAW)

JU2, JU7, JU19

3-pin headers

JU20

4-pin header

40.2kI Q1% resistor (0603)

100kI Q1% resistor (0603)

Single 1.8V to 5V level translator

(6 SC70)

Not installed, dual digital

potentiometer (16 TQFN-EP*)

Dual 1.8V to 5V level translator

(8 SSOP)

—

Shunts (JU1–JU20)

See the EV Kit-Specific

Component List

PCB: MAX5386/5388/5391/5393

EVALUATION KIT+

—

Not installed, digital

potentiometer (14 TSSOP)

*EP = Exposed pad.

Not installed, digital

potentiometer (10 FMAX^M)

EV Kit-Specific Component List

PART

DESIGNATION

DESCRIPTION

256-tap 10kI digital potentiometer (16 TQFN-EP*)

Maxim MAX5391LATE+

(Top Mark: AHJ)

MAX5391LEVKIT+

MAX5391NEVKIT+

256-tap 100kI digital potentiometer (16 TQFN-EP*)

Maxim MAX5391NATE+

(Top Mark: AHL)

Component Suppliers

SUPPLIER

Murata Electronics North America, Inc.

TDK Corp.

PHONE

WEBSITE

www.murata-northamerica.com

www.component.tdk.com

770-436-1300

847-803-6100

Note: Indicate that you are using the MAX5386M, MAX5388, MAX5391, or MAX5393 when contacting these component suppliers.

µMAX is a registered trademark of Maxim Integrated

Products, Inc.

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MAX5391L/MAX5391N Evaluation Systems

4) Connect the multimeters to measure voltages

MAX5391L/MAX5391N

across the MAX5391L/MAX5391N (U2) WA and LA

PCB pads and WB and LB PCB pads.

EV Kit Files

DESCRIPTION

FILE

5) Connect the MINIQUSB+ interface board to the EV

kit J2 and J3 connectors.

Installs the EV kit files on the

computer

INSTALL.EXE

6) Connect the included USB cable from the PC to

the MINIQUSB+ interface board. A Building_Driver_

Database window pops up in addition to a New_

Hardware_ Found message when installing the

USB driver for the first time. If a window is not seen

that is similar to the one described above 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,

Windows XP, and Windows Vista.

MAX5391L.EXE

MAX5391N.EXE

FTD2XX.INF

Application programs

USB driver file

UNINST.INI

Uninstalls the EV kit software

USB_Driver_Help.PDF USB driver installation help file

Quick Start

Required Equipment

• MAX5391L or MAX5391N EV system

MAX5391L/MAX5391N EV kit

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\MAX5391L or C:\Program_Files\

MAX5391N (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 document included with

the software if you have problems during this step.

MINQUSB+ command module (USB cable

included)

• User-supplied Windows 2000, Windows XP, or

Windows Vista PC with a spare USB port

• One or two multimeters

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 MAX5391L/MAX5391N EV kits are fully assembled

and tested. Follow the steps below to verify board opera-

tion:

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

Start_|_Programs menu.

9) Observe as the program automatically detects the

USB connection and starts the main program.

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

load the latest version of the EV kit software, 5391_

Rxx.ZIP. Save the EV kit software to a temporary

folder and uncompress the ZIP file.

10) Using the Device_ Connected combo box, select

MAX5391 from the list and then press the Default

button. The EV kit software main window appears,

as shown in Figure 1.

2) Install the EV kit software on the 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.

11) The EV kit is now ready for additional testing.

3) Verify that shunts are correctly installed on the

jumpers, as listed in Table 1, for proper operation

of the EV kit.

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MAX5391L/MAX5391N Evaluation Systems

Table_1._Jumper_Configuration_for_MAX5391L/MAX5391N_EV_Kit_Operation

SHUNT_

JUMPER

EV_KIT_FUNCTION

POSITION

Installed*

Not installed

1-2*

1.7V LDO output enabled

1.7V LDO output disabled

JU1

MAX5391L/MAX5391N VDD voltage = 1.7V

JU7

2-3

MAX5391L/MAX5391N VDD voltage dependent on jumper JU20 configuration

MAX5391L/MAX5391N HA disconnected from the U2 VDD voltage source

MAX5391L/MAX5391N HA connected to the U2 VDD voltage source

MAX5391L/MAX5391N LA disconnected from GND

MAX5391L/MAX5391N LA connected to GND

MAX5391L/MAX5391N HB disconnected from the U2 VDD voltage source

MAX5391L/MAX5391N HB connected to the U2 VDD voltage source

MAX5391L/MAX5391N LB disconnected from GND

MAX5391L/MAX5391N LB connected to GND

VPOWER = 5V

Not installed

Installed*

Not installed

Installed*

Not installed

Installed*

Not installed

Installed*

1-2

JU8

JU9

JU10

JU11

JU20

1-3*

VPOWER = 3.3V

1-4

VPOWER = 2.6V

*Default position.

Figure 1. MAX5391L/MAX5391N Evaluation Kit Software Main Window

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MAX5391L/MAX5391N Evaluation Systems

Demo Mode

The EV kit software enters the demo mode, when the

Detailed Description of Software

Graphical User Interface (GUI) Panel

The EV kit software GUI shown in Figure 1 is a Windows

program that provides a convenient means to control the

MAX5391L and MAX5391N dual potentiometers. Use the

mouse or press the Tab key to navigate through the GUI

controls. The correct SPI write operations are generated

to update the MAX5391L/MAX5391N internal memory

registers when any of these controls are executed.

USB connection is not detected, by selecting Cancel

on the MAX5391L/MAX5391N_Evaluation_Kit_Interface_

Circuit pop-up window (Figure 2). The software can also

enter demo mode at any time from the main window by

selecting the Options_|_Demo_Mode menu item. 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, deselect the Options_|_Demo_Mode menu item.

The software divides the EV kit functions into group

boxes. The Interface group box indicates the EV kit

Status and the last write operation Command_Sent and

Data_Sent indicators. This data confirms proper device

operation. The Device_ Connected combo box selects

the Maxim part being evaluated and enables the Update_

Pot_ A_ and_ B checkbox function when choosing the

MAX5391 option from the list. The Default button pro-

grams both potentiometers to their midscale positions.

The lower Potentiometer_A and Potentiometer_B group

boxes provide controls to change the respective wiper

positions. The main window’s bottom status bar provides

the USB interface circuit communication status.

Potentiometer A and B Wiper Positions

The wiper position track bars (WA, WB) in the

Potentiometer_ A and Potentiometer_ B group boxes

are used to independently 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 the desired integer value in the

edit boxes, or by pressing the up or down arrows in the

respective edit box. A change in the Wꢀ wiper position_

track bars, or HWꢀ/WLꢀ edit boxes, writes to the regis-

ters and the wiper position is updated with the data sent.

The wiper position is shown in the HWꢀ and WLꢀ edit

boxes. The HWꢀ edit box shows the wiper position with

respect to the potentiometer H_ end point and the WLꢀ

edit box shows the wiper position with respect to the

potentiometer L_ end point.

Software Startup

Upon startup, the EV kit software automatically searches

for the USB interface board’s circuit connection. In the

Interface group box, the Device_Connected combo box

allows the user to select the proper part being evalu-

ated. Upon selection of the device being evaluated, the

Update_Pot_A_and_B checkbox is enabled/disabled. The

EV kit enters the normal operating mode when the USB

connection is detected and the part has been selected.

Since the MAX5391L/MAX5391N do not have read capa-

bility, all the edit boxes are set to question marks (??)

and the Potentiometerꢀ track bars are set to midscale.

If the USB connection is not detected, the software

prompts the user to retry, exit the program, or enter the

demo mode.

Potentiometers A and B can be updated simultaneously

by checking the Update_Pot_A_and_B checkbox. When

enabled, the Potentiometer_ A group box sends the

same data to both digital potentiometers and enables

control of both digital potentiometers together.

Figure 2. MAX5391L/MAX5391N Evaluation Kit Interface Circuit Pop-Up Window

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MAX5391L/MAX5391N Evaluation Systems

Factory Default

Pressing the Default button resets potentiometer A and

B wiper positions to the factory-default midscale posi-

tion.

Simple SPI Commands

There are two methods for communicating with the EV

kit, through the normal user-interface panel (Figure 1),

or through the SPI commands available by selecting the

3-Wire_Interface utility from the main program’s Options_

|_ Advanced_ Users Interface menu bar. A window is

displayed (Figure 3) that allows SPI send/receive data

operations.

Status Indicator

The Status indicator in the Interface group box displays

EV_Kit_Operational when the EV kit enters the normal

operating mode after the USB connection is detected.

If the USB connection is not detected, or when the

software enters the demo mode, the Status indicator

displays Demo_Mode. Demo mode is used to exercise

the software without hardware connectivity.

On the 3-wire_interface tab, the Connection group box

defines the hardware connections of the interface. For

the EV kit, K10 is selected 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 the Use_standard_connections_for_high-speed_SPI

checkbox is checked (see Figure 3).

Command Sent Indicator

The Command_ Sent indicator in the Interface group

box displays the last command sent from the master

(software) to the MAX5391L/MAX5391N IC. There are

three commands available in the MAX5391L/MAX5391N

IC, which are listed in Table 2.

The Configuration group box allows the user to config-

ure the logic level and data rate. For the EV kit, check the

Send_&_Receive_MSB_first checkbox and verify that the

CPOL=1(clock_ idles_ high) and CPHA=1(sample_ 2nd_

edge) checkboxes are unchecked (see Figure 3).

Data Sent Indicator

The Data_Sent indicator displays the last data sent for

the write to potentiometer A (0x00), potentiometer B

(0x01) or both potentiometer (0x03) commands. The

MAX5391L/MAX5391N ICs use an 8-bit (MSBs, D7:0)

data byte to set the wiper position. Refer to the MAX5391/

MAX5393 IC data sheet for additional information.

The Send_ and_ Receive_ Data group box allows the

user to send data to the MAX5391L/MAX5391N. The

Data_ bytes_ to_ be_ written_ edit box indicates data to

be sent from the master (microcontroller) to the device

(MAX5391L or MAX5391N). Eight-bit hexadecimal num-

bers should be comma delimited. Press the Send_Now

button to transmit 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 EV kit software always shows a default value of

0xFF since the MAX5391L/MAX5391N do not send data

back to the master.

Keyboard Navigation

Press the Tab key to select each GUI control. The select-

ed control is indicated by a dotted outline. Using Shift

+ Tab moves the selection to the previously selected

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 pressing the letter of the

desired menu item. Most menu items have one letter

underlined, indicating their shortcut key.

Note: The SPI dialog boxes accept numeric data in

hexadecimal format. Hexadecimal numbers must be

prefixed by $ or 0x. Figure 3 shows a simple SPI write-

byte operation using the included 3-wire interface diag-

nostics tool. In this example, the software is sending

command 0x11 (write to potentiometers A and B) and

data 0x7F. The data sequence sets potentiometer A and

B wiper positions to 127.

When a number is entered into the edit boxes, it is sent to

the device by pressing the Enter key. It is also sent when

Tab or Shift + Tab is pressed.

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MAX5391L/MAX5391N Evaluation Systems

Table_2._MAX5391L/MAX5391N_SPI_Command

COMMAND

BINARY

MAX5391L/

MAX5391N_

DESCRIPTION

HEX

VREGA

VREGB

00000000

00000001

0x00

0x01

SPI data is written to potentiometer A. Wiper WA position updates with SPI data.

SPI data is written to potentiometer B. Wiper WB position updates with SPI data.

SPI data is written to potentiometers A and B. Wipers WA and WB position

updates with SPI data.

VREGAB

00000011

0x03

Figure 3. Simple Low-Level 3-Wire Interface

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MAX5391L/MAX5391N Evaluation Systems

The EV kits are typically used with a MINIQUSB+ inter-

face board for communicating with a PC through the

3-wire serial interface. Logic-level translators (U7 and

U8) provide proper SPI interface translation when using

1.7V to 5.5V to power the MAX5391L/MAX5391N VDD

input.

General Troubleshooting

Problem:_Software_reports_it_cannot_find_the_interface_

circuit

•

Is the USB cable connected to the MINIQUSB+

board?

•

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, uninstall it—this forces plug-

and-play to try again.

EV Kit VDD Input Source

The VPOWER rail is typically supplied as 3.3V or 5V by

the MINIQUSB+ interface board circuitry or 2.6V using

LDO regulator U6. LDO regulator U5 output is set to 1.7V

and is powered from the VPOWER rail. The VPOWER rail

and U5 are used to set the MAX5391L/MAX5391N VDD

input to 5V, 3.3V, 2.6V or 1.7V.

•

If using an off-board SPI interface, is the power

ground connected to the EV kit ground (GND) at one

of the header J1 pin connections (J1-2, J1-4, J1-6,

or J1-8)?

Regulator U5 has an adjustable output that can be con-

figured to a different voltage by replacing resistor R1.

Use the following equation to set U5 output voltage:

Detailed Description of Hardware

VOUT

1.225





R1 = 10

−1



The MAX5391L/MAX5391N EV kits are assembled and

tested PCBs that feature the MAX5391L and MAX5391N

dual digital potentiometers. Potentiometers A and B

have an end-to-end resistance of 10kI (MAX5391L) and

100kI (MAX5391N). Each wiper can be programmed

independently among 256 tap positions. Each EV kit

uses a MAX5391L or MAX5391N IC in a 16-pin thin QFN

package on a proven two-layer PCB design.







where R1 is in ohms and VOUT is the desired U5 output

voltage.

Jumper JU20 selects the source for each EV kit circuit

VPOWER rail. See Table 3 for proper jumper configura-

tion for setting VPOWER rail.

Alternatively, the EV kit’s VDD PCB pad can be used to

supply an external 1.7V to 5.25V to the circuit’s VPOWER

rail by removing the shunt at jumper JU20.

The EV kits provide connector J1 to interface with the

MAX5391L/MAX5391N CS, DIN, SCLK, and GND signals

directly to a user-supplied 3-wire system. Connector J1

also provides a connection for the EV kit’s 1.7V to 5.5V

VPOWER power-supply input.

Jumper JU1 enables/disables LDO U5 output. Install a

shunt across JU1 to enable U5 1.7V output. Remove the

shunt at JU1 to disable U5 output. See Table 4 for proper

jumper JU1 configuration.

Table_3._VPOWER_Rail_(JU20)

Table_4._U5_LDO_Function_(JU1)

SHUNT_POSITION

VPOWER_RAIL

5V (MINIQUSB+ circuitry)

3.3V (MINIQUSB+ circuitry)

2.6V (LDO U6)

SHUNT_

U5_1.7V_OUTPUT

POSITION

1-2

1-3

1-4

Installed*

Not installed

Enabled

Disabled

*Default position.

External source applied at the

EV kit VDD and GND PCB pads

Not installed

Note: LDO U6 output is disabled when the MINIQUSB+ board

is not installed at headers J2 and J3.

8_ _ _ꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀ

MAX5391L/MAX5391N Evaluation Systems

Potentiometer, Voltage-Divider or

Table_5._MAX5391L/MAX5391N_VDD_

Power_Source_(JU7,_JU1,_JU20)

Variable Resistor, with Ground Reference

EachEVkitprovidesanoptiontoconfiguretheMAX5391L/

MAX5391N as a potentiometer or voltage-divider, open

ended or with ground reference, respectively. Use jump-

ers JU8 and JU9 for potentiometer A, and jumpers JU10

and JU11 for potentiometer B configurations. Tables 7

and 8 list jumper options for configuring potentiometers

A and B, respectively.

SHUNT_POSITION

MAX5391L/MAX5391N_

VDD_PIN

JU7

JU1

JU20

1-2*

Installed*

1.7V

Not

installed

1-2

Not powered

The MAX5391L/MAX5391N can also be configured as a

variable resistor by shorting the H_ and W_ pads togeth-

er using a wire. When operating as a variable resistor,

any power source connected to the H_, W_, or L_ pads

must be voltage and current limited to the maximum con-

ditions stated in the MAX5391/MAX5393 IC data sheet.

1-2

1-3

1-4

3.3V

2.6V

2-3

External source applied

at the VDD and GND

PCB pads

Not

installed

Note:_To test the device in resistor mode, the ohmmeter

must be GND referenced to the MAX5391L/MAX5391N.

This can be accomplished by connecting the L_ pin to

GND or the H_ pin to U2 VDD. Resistance can then be

measured between W_ and L_ or W_ and H_ PCB pads.

*Default position.

X = Don’t care.

MAX5391L/MAX5391N VDD

Input Configuration

Jumper JU7 selects the power source for the MAX5391L/

MAX5391N VDD input. Install a shunt across pins 1-2

of jumper JU7 to operate the IC extended VDD input

power supply rail to 1.7V. Install a shunt across pins

2-3 to operate the IC VDD input from the VPOWER rail.

See Table 5 for proper jumper configuration for the

MAX5391L/MAX5391N VDD power-supply input.

Evaluating the MAX5386M/MAX5388/

MAX5393 ICs

The MAX5391L and MAX5391N EV kits are populated

with additional PCB footprints (U1, U4, and U3) and vari-

ous jumpers to evaluate the MAX5386M, MAX5388, and

MAX5393, respectively.

An additional MAX5391L/MAX5391N can be placed at

U1 for evaluation. PCB pads C5 or C6 are available for

the IC BYP input. Use ceramic capacitors less than 1µF

at C5 or C6 for proper operation of the IC charge pump.

Refer to the MAX5386M, MAX5388, or MAX5393 evalu-

ation system data sheets for additional information when

evaluating the_MAX5386, MAX5388, or MAX5393 digital

potentiometers.

SPI Clock and Data-/Chip-Select Inputs

The MAX5391L/MAX5391N features a clock and data-/

chip-select input pins for SPI-compatible communica-

tion to control the wiper position. The clock and data-/

chip-select pins can be driven by the MINIQUSB+

interface circuit or the PCB header (J1), along with a

user-supplied external SPI-compatible controller. An

external SPI-compatible controller can be connect-

ed to CS (J1-3), DIN (J1-5), SCLK (J1-7), and GND

(J1-2, J1-4, J1-6, J1-8) on header J1 to communicate

with the MAX5391L/MAX5391N IC. When using an exter-

nal SPI-compatible controller, verify that the MINIQUSB+

interface board has been disconnected from the EV

kit’s J2 and J3 headers. See Table 6 for header J1 pin

assignments.

Table_6._Header_J1_Pin_Assignments

SIGNAL

VPOWER

GND

J1-1

J1-2, J1-4, J1-6, J1-8

J1-3

J1-5

J1-7

DIN

SCLK

ꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀ_ _ 9

MAX5391L/MAX5391N Evaluation Systems

Table_7._JU8_and_JU9_Jumper_Functions_(Potentiometer_A)

SHUNT_POSITION

HA_PAD

LA_PAD

MAX5391L/MAX5391N_FUNCTION

JU8

JU9

Not installed

Installed*

Not installed

Installed

Not connected

Connected to GND

Not connected

Potentiometer open ended

Not installed*

Not connected

Potentiometer with GND reference

Voltage-divider open ended

Connected to

U2 VDD

Installed

Connected to GND

Voltage-divider with GND reference

*Default position.

Table_8._JU10_and_J11_Jumper_Functions_(Potentiometer_B)

SHUNT_POSITION

HB_PAD

LB_PAD

MAX5391L/MAX5391N_FUNCTION

JU10

JU11

Not installed

Installed*

Not connected

Connected to GND

Not connected

Potentiometer open ended

Not installed*

Not connected

Potentiometer with GND reference

Voltage-divider open end

Not installed

Installed

Connected to

U2 VDD

Installed

Connected to GND

Voltage-divider with GND reference

*Default position.

Table_9._Jumper_Configuration_(JU1–JU20)

JUMPER

SHUNT_POSITION

Installed*

Not installed

1-2

EV_KIT_FUNCTION

1.7V LDO output enabled

JU1

1.7V LDO output disabled

MAX5386M voltage = 1.7V

JU2

JU3

JU4

JU5

JU6

JU7

JU8

JU9

JU10

JU11

2-3*

MAX5386M VDD voltage dependent on jumper JU20 configuration

MAX5386M HA disconnected from the U1 VDD voltage source

MAX5386M HA connected to the U1 VDD voltage source

MAX5386M LA disconnected from GND

Not installed

Installed*

Not installed

Installed*

Not installed

Installed*

Not installed

Installed*

1-2*

MAX5386M LA connected to GND

MAX5386M HB disconnected from the U1 VDD voltage source

MAX5386M HB connected to the U1 VDD voltage source

MAX5386M LB disconnected from GND

MAX5386M LB connected to GND

MAX5391L/MAX5391N VDD voltage = 1.7V

2-3

MAX5391L/MAX5391N VDD voltage dependent on jumper JU20 configuration

MAX5391L/MAX5391N HA disconnected from the U2 VDD voltage source

MAX5391L/MAX5391N HA connected to the U2 VDD voltage source

MAX5391L/MAX5391N LA disconnected from GND

MAX5391L/MAX5391N LA connected to GND

Not installed

Installed*

Not installed

Installed*

Not installed

Installed*

Not installed

Installed*

MAX5391L/MAX5391N HB disconnected from the U2 VDD voltage source

MAX5391L/MAX5391N HB connected to the U2 VDD voltage source

MAX5391L/MAX5391N LB disconnected from GND

MAX5391L/MAX5391N LB connected to GND

10_ _ _ꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀ

MAX5391L/MAX5391N Evaluation Systems

Table_9._Jumper_Configuration_(JU1–JU20)_(continued)

JUMPER

SHUNT_POSITION

Not installed

Installed*

Not installed

Installed*

Not installed

Installed*

Not installed

Installed*

Not installed

Installed*

Not installed

Installed*

Not installed

Installed*

1-2

EV_KIT_FUNCTION

MAX5393 HA disconnected from the U3 VDD voltage source

MAX5393 HA connected to the U3 VDD voltage source

MAX5393 LA disconnected from GND

MAX5393 LA connected to GND

JU12

JU13

JU14

JU15

JU16

JU17

JU18

JU19

MAX5393 HB disconnected from the U3 VDD voltage source

MAX5393 HB connected to the U3 VDD voltage source

MAX5393 LB disconnected from GND

MAX5393 LB connected to GND

MAX5388 LA disconnected from GND

MAX5388 LA connected to GND

MAX5388 HB disconnected from the U4 VDD voltage source

MAX5388 HB connected to the U4 VDD voltage source

MAX5388 LB disconnected from GND

MAX5388 LB connected to GND

MAX5393 VDD voltage = 1.7V

2-3*

MAX5393 VDD voltage dependent on jumper JU20 configuration

VPOWER = 5V

1-2

JU20

1-3*

VPOWER = 3.3V

1-4

VPOWER = 2.6V

*Default position.

ꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀ_ _ 11

MAX5391L/MAX5391N Evaluation Systems

Figure 4. MAX5391L/MAX5391N EV Kit Schematic

12_ _ _ꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀ

MAX5391L/MAX5391N Evaluation Systems

1.0’’

Figure 6. MAX5391L/MAX5391N EV Kit PCB Layout—

Component Side

Figure 5. MAX5391L/MAX5391N EV Kit Component Placement

Guide—Component Side

1.0’’

Figure 7. MAX5391L/MAX5391N EV Kit PCB Layout—

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

2009 Maxim Integrated Products

Maxim is a registered trademark of Maxim Integrated Products, Inc.

MAX5391LEVMINIQU [MAXIM]

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