19-4448; Rev 0; 1/09
MAX6639 Evaluation Kit
General Description
The MAX6639 evaluation kit (EV kit) is an assembled and
tested PCB used to evaluate the MAX6639 dual tempera-
ture sensor/fan controller. The MAX6639 monitors its own
die temperature and the junction temperature of one
external diode-connected transistor, or the junction tem-
peratures of two external diode-connected transistors. It
converts the temperature to 8-bit or 11-bit 2-wire serial
data that can be accessed over a 2-wire serial bus.
The MAX6639 EV kit includes both external diode-connect-
ed transistors (2N3906) soldered to the board, which can
be bypassed to connect the board through a twisted pair
to remote diodes close to your system.
The temperature data is also used by the internal dual
PWM fan-speed controller to adjust the speed of up to
two cooling fans. Speed control is accomplished by
tachometer feedback from the fan.
The EV kit also includes Windows
®
2000/XP- and
Windows Vista
®
-compatible software, which provides a
simple user interface for exercising the features of the
MAX6639. The program is menu-driven and offers a
graphical user interface (GUI) complete with control but-
tons. The EV kit comes with the MAX6639AEE+ installed.
Contact the factory for free samples of the pin-compatible
MAX6639FAEE+ and MAX6640AEE+.
The MAX6639 EV kit also evaluates the MAX6640. The
MAX6640 is not recommended for new designs.
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o
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Features
Two Thermal-Diode Inputs
Local Temperature Sensor
Programmable Temperature Alarms
Two PWM Outputs for Fan Drive
Up to 25kHz PWM Output Frequency
Programmable Fan-Control Characteristics
3-Wire and 4-Wire Fan Configurations
On-Board Microcontroller to Generate
SMBus™/I
2
C Commands
USB-PC Connection (Cable Included)
Windows 2000/XP- and Windows Vista
(32-Bit)-Compatible Software
Easy-to-Use, Menu-Driven Software
Lead(Pb)-Free and RoHS Compliant
Fully Assembled and Tested
Evaluates: MAX6639/MAX6639F
Ordering Information
PART
MAX6639EVKIT+
TYPE
EV Kit
+Denotes
lead(Pb)-free and RoHS compliant.
Windows and Windows Vista are registered trademarks of
Microsoft Corp.
SMBus is a trademark of Intel Corp.
Component List
DESIGNATION QTY
C1, C12, C14
3
DESCRIPTION
10µF ±10%, 16V X5R ceramic
capacitors (0805)
Murata GRM21BR61C106K
22pF ±5%, 50V C0G ceramic
capacitors (0603)
Murata GRM1885C1H220J
0.033µF ±10%, 25V X7R ceramic
capacitor (0603)
TDK C1608X7R1E333K
0.1µF ±10%, 16V X7R ceramic
capacitors (0603)
TDK C1608X7R1C104K
1µF ±10%, 16V X5R ceramic
capacitors (0603)
TDK C1608X5R1C105K
10pF ±5%, 50V C0G ceramic
capacitors (0603)
Murata GRM1885C1H100J
DESIGNATION QTY
C20, C21
D1, D2, D3
D4
H1
J1, J2
J3, J4
JU1–JU7
JU8–JU13
L1
2
3
1
0
2
2
7
0
1
DESCRIPTION
2200pF ±10%, 50V X7R ceramic
capacitors (0603)
Murata GRM188R71H222K
Red LEDs (0603)
Green LED (0603)
Not installed, dual-row (2 x 5)
10-pin JTAG header
3-pin headers, 0.1in pitch, vertical,
friction lock
4-pin headers, 0.1in pitch, vertical,
friction lock
3-pin headers
Not installed, 2-pin headers—shorted
by PCB trace
Ferrite bead (0603)
TDK MMZ1608R301A
C2, C3
2
C4
1
C5–C10 , C17,
C18, C19
9
C11, C13, C22
3
C15, C16
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.
MAX6639 Evaluation Kit
Evaluates: MAX6639/MAX6639F
Component List (continued)
DESIGNATION QTY
N1, N2
2
DESCRIPTION
n-channel MOSFET, 1.4A, 30V
(3 SOT23)
Fairchild NDS351AN
USB type-B right-angle PC-mount
receptacle
2N3906-type pnp transistors (SOT23)
Central Semi CMPT3906
27Ω ±5% resistors (0603)
1.5kΩ ±5% resistors (0603)
470Ω ±5% resistor (0603)
2.2kΩ ±5% resistor (0603)
10kΩ ±5% resistors (0603)
169kΩ ±1% resistor (0603)
100kΩ ±1% resistor (0603)
Not installed, resistors—shorted by
PCB trace (0402)
47Ω ±5% resistor (0603)
4.7kΩ ±5% resistors (0603)
Not installed, resistors (0603)
Y2
—
—
—
0
1
7
1
1
Y1
1
U4
U5
U6
1
1
1
DESIGNATION QTY
R28
U1
U2
U3
1
1
1
1
DESCRIPTION
220Ω ±5% resistor (0603)
Temp sensor fan controller (16 QSOP)
Maxim MAX6639AEE+
Microcontroller (68 QFN-EP*)
Maxim MAXQ2000-RAX+
LDO regulator (5 SC70)
Maxim MAX8511EXK25+
Adjustable output LDO regulator
(5 SC70)
Maxim MAX8512EXK+
UART-to-USB converter (32 TQFP)
93C46 EEPROM (8 SO)
16MHz crystal (HCM49)
Hong Kong X’tals
SSM1600000E18FAF
6MHz crystal (HCM49)
Hong Kong X’tals
SSL600000E18FAF
Shunts
USB high-speed A-to-B cable, 6ft
PCB: MAX6639 Evaluation Kit+
P1
Q1, Q2
R1, R2
R3, R19, R20,
R21
R4
R5
R6, R16, R18
R7
R8
R9–R13
R14
R15, R17, R22,
R23, R24
R25, R26, R27
1
2
2
4
1
1
3
1
1
0
1
5
*EP
= Exposed pad.
Component Suppliers
SUPPLIER
Central Semiconductor Corp.
Fairchild Semiconductor
Hong Kong X’tals Ltd.
Murata Electronics North America, Inc.
TDK Corp.
PHONE
631-435-1110
888-522-5372
852-35112388
770-436-1300
847-803-6100
WEBSITE
www.centralsemi.com
www.fairchildsemi.com
www.hongkongcrystal.com
www.murata-northamerica.com
www.component.tdk.com
Note:
Indicate that you are using the MAX6639 when contacting these component suppliers.
MAX6639 EV Kit Files
FILE
INSTALL.EXE
MAX6639.EXE
FTD2XX.INF
UNINST.INI
USB_Driver_Help.PDF
DESCRIPTION
Installs the EV kit files on your
computer
Application program
USB driver file
Uninstalls the EV kit software
USB driver installation help file
2
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MAX6639 Evaluation Kit
Quick Start
Recommended Equipment
•
•
•
A MAX6639 EV kit (USB cable included)
A user-supplied Windows 2000/XP- or Windows
Vista-compatible PC with a spare USB port
A power supply to power the fans (the voltage and
current depend on the fans used, but the voltage
must not exceed 30V)
One or two 3-pin DC fans with tachometer outputs
(each fan must not draw more than 1.4A continuous)
1) Visit
www.maxim-ic.com/evkitsoftware
to down-
load the latest version of the EV kit software,
6639Rxx.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) Verify that all jumpers (JU1–JU7) are in their default
positions, as shown in Table 1.
4) Connect the fan(s) to J1 and J2 on the EV kit board.
5) Connect the fan power supply to the pads labeled
VFAN and FAN_GND.
6) Connect the USB cable from the PC to the EV kit
board. A
New Hardware Found
window pops up
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 priv-
ileges are required to install the USB device driver
on Windows.
Evaluates: MAX6639/MAX6639F
•
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 MAX6639 EV kit is fully assembled and tested.
Follow the steps below to verify board operation.
Caution: Do not turn on power supply until all con-
nections are completed.
Table 1. MAX6639 EV Kit Jumper Description Table (JU1–JU7)
JUMPER
JU1
JU2
JU3
JU4
SHUNT
POSITION
1-2*
2-3
1-2*
2-3
1-2*
2-3
1-2*
2-3
1-2*
JU5
Open
2-3
JU6
1-2*
2-3
1-2*
2-3
DESCRIPTION
Connects the MAX6639 to the on-board 3.3V supply
Connects the MAX6639 to the user-supplied 3.0V to 3.6V supply
Connects the MAX6639 to the on-board SCL
Connects the MAX6639 to the user-supplied SCL
Connects the MAX6639 to the on-board SDA
Connects the MAX6639 to the user-supplied SDA
Connects the MAX6639 to the on-board
ALERT
Connects the MAX6639 to the user-supplied
ALERT
Connects pin ADD of the MAX6639 to VCC. Address = 0x5E. If the MAX6640 is used, always use
this jumper in the 1-2 position.
Pin ADD of the MAX6639 left unconnected. Address = 0x5C.
Connects pin ADD of the MAX6639 to ground. Address = 0x58. Not allowed on the MAX6640.
Connects the pullup resistor for the TACH1 signal to the voltage VFAN, which is used for 3-wire fans
Connects the pullup resistor for the TACH1 signal of the MAX6639 to the voltage VIN, which is used
for 4-wire fans
Connects the pullup resistor for the TACH2 signal of the MAX6639 to the voltage VFAN, which is
used for 3-wire fans
Connects the pullup resistor for the TACH2 signal of the MAX6639 to the voltage VIN, which is used
for 4-wire fans
JU7
*Default
position.
_______________________________________________________________________________________
3
MAX6639 Evaluation Kit
Evaluates: MAX6639/MAX6639F
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\MAX6639
(default installation
directory) using the
Browse
button. During device
driver installation, Windows may show a warning
message indicating that the device driver provided
by Maxim 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 for additional
information.
8) Turn on fan power supply.
9) Start the EV kit software by opening its icon in the
Start | Programs
menu. The EV kit software main
window should appear as shown in Figure 1. Observe
as the program automatically detects the address of
the MAX6639 and starts the main program.
Detailed Description of Software
User Interface
The user interface is easy to operate. Each button cor-
responds to bits in the command and configuration
byte. By pressing them, the correct I
2
C-compatible
write operation is generated to update the internal reg-
isters of the MAX6639.
Automatic Read
The program polls the device for the new temperature
and status data a maximum of two times per second
(2Hz). To disable the polling of data, uncheck the
Auto
Read
checkbox located at the top of the program.
Data Logging
Check the
Data Logging
checkbox located at the top of
the program to activate data logging. Data logging saves
temperature, voltage, and status data to a text file that
includes a time/date stamp next to each data point. If the
Auto Read
checkbox is checked, data is sampled at
2Hz. When the
Auto Read
checkbox is unchecked, the
Figure 1. MAX6639 EV Kit Software Main Window (Temperature Tab)
4
_______________________________________________________________________________________
MAX6639 Evaluation Kit
data is logged each time
Read All
is selected from the
Options
menu bar. To stop data logging, uncheck the
Data Logging
checkbox.
ideality factor is equal to 1.008. Transistors with different
ideality factors produce different remote temperature
readings. Some typical discrete transistors may produce
readings that vary approximately 3°C from the correct
value. Refer to Application Note 1057:
Compensating for
Ideality Factor and Series Resistance Differences Between
Thermal Sense Diodes
for additional information.
Evaluates: MAX6639/MAX6639F
Temperature
The MAX6639 monitors its own die temperature and the
junction temperature of one external diode-connected
transistor, or the junction temperature of two external
diode-connected transistors. The temperature mea-
surements are capable of either 8-bit or 11-bit (extend-
ed) resolution; 8-bit resolution results in a temperature
resolution of 1°C/LSB. Extended resolution results in a
temperature resolution of 0.125°C/LSB and is enabled
by checking the
Enable Extended Resolution (0x05)
checkbox (Figure 1).
Read the temperatures by pressing the
Read
buttons
within the
Temperature
tab sheet (Figure 1). The tem-
perature is shown to the right of the buttons.
ALERT
,
THERM
, and
OT
Temperature Limits
The MAX6639 has
ALERT, THERM,
and overtempera-
ture (OT) limit registers. Temperatures exceeding the
ALERT
limit register generate an alert interrupt.
Exceeding the
THERM
or
OT
limits sets the
THERM
or
overtemperature bit in the status register and asserts
the
THERM
or
OT
output pin.
Read a limit by pressing the
Read
button (Figure 1). The
value (in Celsius) is shown to the right of the button.
Change a limit by entering the value (in Celsius) into the
appropriate edit field and pressing the
Write
button.
External Diodes
The MAX6639AEE remote temperature sensor is opti-
mized for use with a diode-connected transistor whose
Figure 2. MAX6639 EV Kit Software Main Window (Global Configuration Tab)
_______________________________________________________________________________________
5
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