19-5176; Rev 0; 3/10
MAX5388 Evaluation System
General Description
The MAX5388 evaluation kit (EV kit) is an assembled
and tested PCB that features the MAX5388N 100kΩ dual
digital potentiometers. The MAX5388 IC consists of one
digital potentiometer in a variable-resistor configuration
and one digital potentiometer in a voltage-divider config-
uration and communicates through an SPI™-compatible
serial interface.
The MAX5388EVMINIQU+ evaluation system (EV sys-
tem) includes the EV kit and the MINIQUSB+ interface
board. The MINIQUSB+ interface board can be used to
enable PC communication through the 3-wire serial inter-
face. Windows
®
2000-, Windows XP
®
-, and Windows
Vista
®
-compatible software provides a professional user
interface for exercising the MAX5388’s 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 MAX5386, MAX5388L, MAX5388M, MAX5391, and
MAX5393. The EV kit can also be interfaced directly to a
user-supplied 3-wire system.
The MAX5388 IC can be powered from a 2.6V, 3.3V,
or 5V source generated from the MINIQUSB+ inter-
face board and EV kit circuitry, or from a user-supplied
external 2.6V to 5.25V DC power supply. Order the
MAX5388EVMINIQU+ for a complete PC-based evalua-
tion of the MAX5388.
The EV kit also contains PCB footprints for the MAX5386,
MAX5391, and MAX5393. To evaluate these parts, order
samples and fit the parts in places U1, U2, and U3,
respectively.
Serial-Interface Operation
S
Easy-to-Use Menu-Driven Software
S
Includes Windows 2000-, Windows XP-, and
Features
S
2.6V to 5.25V Single-Supply Operation
S
PC USB to 3-Wire Interface or Stand-Alone 3-Wire
Evaluates: MAX5386/MAX5388/MAX5391/MAX5393
Windows Vista-Compatible Software
S
Fully Assembled and Tested
Ordering Information
PART
TYPE
MAX5388EVMINIQU+
EV System
+Denotes
lead(Pb)-free and RoHS compliant.
Component Lists
MAX5388 EV System
(MAX5388EVMINIQU+)
PART
MAX5388EVKIT+
MINIQUSB+
QTY
1
1
DESCRIPTION
EV kit
Maxim command module
MAX5388 EV Kit
(MAX5388EVKIT+)
DESIGNATION
C1, C2, C3,
C7, C10, C11,
C14, C15, C19,
C20, C23, C24,
C25
C4, C8, C12,
C16
C5, C6, C9,
C13
QTY
DESCRIPTION
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
Not installed, ceramic capacitors
(0603)
10FF
Q10%,
6.3V X5R ceramic
capacitor (0805)
Murata GRM21BR60J106K or
TDK C2012X5R0J106K
2 x 4-pin header
2 x 8-pin header
8-pin female receptacle
13
4
0
C26
1
J1
SPI is a trademark of Motorola, Inc.
Windows, Windows XP, and Windows Vista are registered
trademarks of Microsoft Corp.
J2
J3
1
1
1
_______________________________________________________________
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.
MAX5388 Evaluation System
Evaluates: MAX5386/MAX5388/MAX5391/MAX5393
Component Lists (continued)
MAX5388 EV Kit (MAX5388EVKIT+) (continued)
DESIGNATION
JU1, JU3–JU6,
JU8–JU18
JU2, JU7, JU19
JU20
R1
R2
U1
U2
U3
QTY
16
3
1
1
1
0
0
0
DESCRIPTION
2-pin headers
3-pin headers
4-pin header
40.2kI
Q1%
resistor (0603)
100kI
Q1%
resistor (0603)
Not installed, digital potentiom-
eter (16 TQFN-EP*)
Not installed, digital potentiom-
eter (16 TQFN-EP*)
Not installed, digital
potentiometer (14 TSSOP)
256-tap dual digital
potentiometer (10
FMAX
M
)
Maxim MAX5388NAUB+
U6
1
U5
1
DESIGNATION
QTY
DESCRIPTION
Adjustable output LDO regulator
(5 SC70)
Maxim MAX8512EXK+
(Top Mark: ADW)
2.6V LDO regulator (5 SC70)
Maxim MAX8511EXK26+
(Top Mark: AAW)
Single 1.8V to 5V level translator
(6 SC70)
Dual 1.8V to 5V level translator
(8 SSOP)
Shunts (JU1–JU20)
PCB: MAX5386/5388/5391/5393
EVALUATION KIT+
U7
U8
—
—
*EP
= Exposed pad.
1
1
20
1
U4
1
Component Suppliers
SUPPLIER
Murata Electronics North America, Inc.
PHONE
770-436-1300
WEBSITE
www.murata-northamerica.com
TDK Corp.
847-803-6100
www.component.tdk.com
Note:
Indicate that you are using the MAX5386, MAX5388, MAX5391, or MAX5393 when contacting these component suppliers.
MAX5388 EV Kit Files
FILE
INSTALL.EXE
MAX5388.EXE
FTD2XX.INF
UNINST.INI
USB_Driver_Help.PDF
Application program
USB driver file
Uninstalls the EV kit software
USB driver installation help file
DESCRIPTION
Installs the EV kit files on the computer
µMAX is a registered trademark of Maxim Integrated Products,
Inc.
2
______________________________________________________________________________________
MAX5388 Evaluation System
Evaluates: MAX5386/MAX5388/MAX5391/MAX5393
Quick Start
•
MAX5388 EV system
MAX5388 EV kit
MINIQUSB+ command module (USB cable
included)
•
•
User-supplied Windows 2000, Windows XP, or
Windows Vista PC with a spare USB port
One or two multimeters
7)
5)
6)
Connect the MINIQUSB+ interface board to the EV
kit J2 and J3 connectors.
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 similar
to the one described above is not seen 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,
Windows XP, and Windows Vista.
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\MAX5388
(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.
Start the EV kit software by opening its icon in the
Start | Programs
menu.
Observe as the program automatically detects the
USB connection and starts the main program.
Using the
Device Connected
combo box, select
MAX5388 from the list and then press the
Default
button. The EV kit software main window appears,
as shown in Figure 1.
The EV kit is now ready for additional testing.
Required Equipment
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.
The MAX5388 EV kit is fully assembled and tested.
Follow the steps below to verify board operation:
1)
Procedure
Visit
www.maxim-ic.com/evkitsoftware
to down-
load the latest version of the EV kit software,
5388Rxx.ZIP. Save the EV kit software to a tempo-
rary folder and uncompress the ZIP file.
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.
Verify that shunts are correctly installed on the
jumpers listed in Table 1 for proper operation of the
EV kit.
Connect the multimeters to measure resistance
across the MAX5388’s (U4) WA and LA PCB pads
and voltage across the WB and LB PCB pads.
8)
9)
10)
2)
3)
4)
11)
Table 1. Jumper Configuration
JUMPER
JU16
JU17
JU18
SHUNT POSITION
Not installed
Installed*
Not installed
Installed*
Not installed
Installed*
1-2
JU20
*Default position.
_______________________________________________________________________________________
3
1-3*
1-4
EV KIT FUNCTION
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
VPOWER = 5V
VPOWER = 3.3V
VPOWER = 2.6V
MAX5388 Evaluation System
Evaluates: MAX5386/MAX5388/MAX5391/MAX5393
Detailed Description of Software
The MAX5388 EV kit software GUI shown in Figure 1 is
a Windows program that provides a convenient means
to control the MAX5388 dual potentiometer. Use the
mouse or press the Tab key to navigate through the GUI
controls. The correct SPI write operations are generated
to update the MAX5388 internal memory registers when
any of these controls are executed.
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 or MAX5393 option from the
list. The
Default
button programs 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 win-
dow’s bottom-left status bar provides the USB interface
circuit communication status.
The EV kit software can also be used to evaluate
the MAX5386, MAX5388L, MAX5388M, MAX5391, and
MAX5393.
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
Graphical User Interface (GUI) Panel
Software Startup
Figure 1. MAX5388 Evaluation Kit Software Main Window
4
______________________________________________________________________________________
MAX5388 Evaluation System
Evaluates: MAX5386/MAX5388/MAX5391/MAX5393
connection is detected and the part has been selected.
Since the MAX5388 does not have read capability, all
the edit boxes are set to question marks (??) and the
Potentiometer_
track bar is 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.
The EV kit software enters the demo mode—when the
USB connection is not detected—by selecting
Cancel
on the
MAX5388 Evaluation Kit Interface Circuit
popup window (Figure 2). The software can also enter
demo mode at any time from the main window by select-
ing 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 wiper position track bars (WA, WB) in the
Potentiometer A
and
Potentiometer B
group boxes
are 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 posi-
tion 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
W_
wiper position track bars,
or
HW_/WL_
edit boxes, writes to the volatile memory
and the wiper position is updated with the data sent.
The wiper position is shown in the
HW_
and
WL_
edit
boxes. The
HW_
edit box shows the wiper position with
respect to the potentiometer H_ end point and the
WL_
edit box shows the wiper position with respect to the
potentiometer L_ end point.
Pressing the
Default
button resets the potentiometer A
and B wiper positions to the factory-default midscale
position.
Demo Mode
Factory Default
Potentiometer A and B Wiper Positions
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.
The
Command Sent
indicator in the
Interface
group
box displays the last command sent from the master
(software) to the MAX5388. There are two commands
available in the MAX5388 IC. Table 2 describes the two
MAX5388 commands.
Status Indicator
Command Sent Indicator
The
Data Sent
indicator in the
Interface
group box dis-
plays the last data sent from the master (software) to the
MAX5388. The
Data Sent
indicator displays the last data
Data Sent Indicator
Figure 2. MAX5388 Evaluation Kit Interface Circuit Popup Window (Interface Board Not Found)
Table 2. MAX5388 SPI Command
MAX5388 REGISTER
VREGA
VREGB
COMMAND
BINARY
00000000
00000001
HEX
0x00
0x01
DESCRIPTION
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.
_______________________________________________________________________________________
5
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