19-4161; Rev 1; 12/08
MAX5498 Evaluation Kit
General Description
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.
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.
Features
o
2.7V to 5.25V Single-Supply Operation
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
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
Evaluates: MAX5494–MAX5499
Ordering Information
SPI is a trademark of Motorola, Inc.
Windows and Windows Vista are registered trademarks of
Microsoft Corp.
PART
MAX5498EVKIT+
TYPE
EV Kit
+Denotes
lead(Pb)-free and RoHS compliant.
Component List
DESIGNATION
C1, C4–C8,
C12, C17, C19
QTY
DESCRIPTION
0.1µF ±10%, 16V X7R ceramic
capacitors (0603)
TDK C1608X7R1C104K
Murata GRM188R71C104K
10µF ±20%, 16V X5R ceramic
capacitors (1206)
Murata GRM31CR61C106M or
TDK C3216X5R1C106M
Not installed, ceramic capacitor
(0603)
0.033µF ±10%, 16V (min) X5R
ceramic capacitor (0603)
Murata GRM188R71E333K
TDK C1608X7R1E333K
22pF ±5%, 50V C0G ceramic
capacitors (0603)
Murata GRM1885C1H220J or
TDK C1608C0G1H220J
DESIGNATION
QTY
DESCRIPTION
1µF ±10%, 16V X5R ceramic
capacitor (0603)
TDK C1608X5R1C105K
Murata GRM188R61C105K
10pF ±5%, 50V C0G ceramic
capacitors (0603)
Murata GRM1885C1H100J or
TDK C1608C0G1H100J
Green LED (0805)
70Ω, 4A ferrite bead (0603)
TDK MMZ1608R301A
Murata BLM18SG700 TN1
4-pin headers, 0.1in centers
Not installed, dual-row (2 x 6) 12-pin
header, 0.1in centers
Not installed, dual-row (2 x 5) 10-pin
JTAG header, 0.1in centers
9
C14
1
C2, C13, C15
3
C16, C18
2
C3
0
D1
FB1
J1, J2
J3
J4
1
1
2
0
0
C9
1
C10, C11
2
________________________________________________________________
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.
MAX5498 Evaluation Kit
Evaluates: MAX5494–MAX5499
Component List (continued)
DESIGNATION
JU1, JU2
P1
R1, R2
R3
R4, R7
R5
R6
R8, R17
R9, R10, R11
R12–R16
QTY
2
1
2
1
2
1
1
2
0
0
DESCRIPTION
3-pin headers, 0.1in centers
USB series-B right-angle PC-mount
receptacle
27Ω ±5% resistors (0603)
1.5kΩ ±5% resistor (0603)
470Ω ±5% resistors (0603)
2.2kΩ ±5% resistor (0603)
10kΩ ±5% resistor (0603)
0Ω resistors (0603)
Not installed, resistors (0603)
Not installed, resistors—short (PC
trace) (0402)
10-bit (1024-tap), dual linear-taper
digital potentiometer (16 TQFN-EP*)
Maxim MAX5498ETE+
Low-voltage level translator (14 TSSOP)
Maxim MAX3390EEUD+
DESIGNATION
U3
U4
U5
U6
Y1
Y2
Y3
—
—
QTY
1
1
1
1
1
0
1
4
1
DESCRIPTION
Microcontroller (68 QFN-EP*)
Maxim MAXQ2000-RAX+
LDO regulator (5 SC70)
Maxim MAX8511EXK25+
USB-to-UART converter (32 TQFP)
FTDI FT232BL
93C46 type 3-wire EEPROM (8 SO)
Atmel AT93C46A-10SU-2.7
16MHz crystal
Not installed, 32.768kHz crystal
6MHz crystal
Shunts
PCB: MAX5498 Evaluation Kit+
U1
1
*EP
= Exposed pad.
U2
1
Component Suppliers
SUPPLIER
Murata Electronics North America, Inc.
TDK Corp.
PHONE
770-436-1300
847-803-6100
WEBSITE
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.
MAX5498 EV Kit Files
FILE
INSTALL.EXE
MAX5498.EXE
FTD2XX.INF
UNINST.INI
USB_Driver_Help.PDF
Application program
USB device driver file
Uninstalls the EV kit software
USB driver installation help file
DESCRIPTION
Installs the EV kit files on your computer
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
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.
2
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MAX5498 Evaluation Kit
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.
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.
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.
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.
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.
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.
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.
Evaluates: MAX5494–MAX5499
Table 1. Default Jumper Settings
JUMPER
J1, J2
JU1
JU2
SHUNT
POSITION
3-4
1-2
2-3
DESCRIPTION
Provides a ground reference for
resistor mode measurements
EV kit powered from USB bus voltage
(5V)
VSS tied to GND (single-supply
operation)
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).
Factory Reset
Pressing the
Factory Reset
button returns wipers 1
and 2 (and the nonvolatile memory) to the midscale tap
position.
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).
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.
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).
_______________________________________________________________________________________
3
MAX5498 Evaluation Kit
Evaluates: MAX5494–MAX5499
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
Save active
NV
button. As confirmation, the
Command History
group box displays SPI sequence 0x22.
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.
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.
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.
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.
Figure 1. MAX5498 EV Kit Main Window
4
_______________________________________________________________________________________
MAX5498 Evaluation Kit
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.
Evaluates: MAX5494–MAX5499
Table 2. J1 and J2 Shunt Configuration
SHUNT
POSITION
3-4*
Not
installed
PIN
L1, L2
L1, L2
DESCRIPTION
L terminals connected to GND (use
when measuring digital pot resistance)
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.
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.
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.
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
SIGNAL
SHUNT
POSITION
1-2*
Open
VDD
2-3
EV KIT FUNCTION
Power device from USB 5V supply.
Do not use—device will not be powered.
Power device from external power
supply (2.7V to 5.25V) connected
between VDD and GND pads.
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).
*Default
position.
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