19-3852; Rev 0; 10/05
MAX6616 Evaluation Kit/Evaluation System
General Description
The MAX6616 evaluation system (EV system) consists
of a MAX6616 evaluation kit (EV kit) and a Maxim
CMODUSB command module.
The MAX6616 EV kit is a fully assembled and tested cir-
cuit board that evaluates the MAX6616 dual-channel
temperature monitor with fan-speed controller.
Order the complete EV system (MAX6616EVCMODU)
for a comprehensive evaluation of the MAX6616 using a
PC. Order the EV kit (MAX6616EVKIT) if the CMODUSB
command module has already been purchased with a
previous Maxim EV system or for custom use in other
microcontroller-based (µC) systems.
The EV kit comes with the MAX6616AEG installed.
♦
Two Thermistor Inputs
♦
Local Temperature Sensor
♦
Six GPIOs
♦
Two PWM Outputs for Fan-Speed Control
♦
Programmable Fan-Control Characteristics
♦
Automatic Fan Spin-Up Ensures Fan Start
♦
Nine Pin-Programmable SMBus
™
/I
2
C Addresses
♦
Proven PC Board Layout
♦
Windows
®
98SE/2000/XP-Compatible Evaluation
Software
♦
Fully Assembled and Tested
Features
Evaluate: MAX6616
Component List
MAX6616 EV Kit
DESIGNATION
C1–C6
QTY
6
DESCRIPTION
0.1µF ±15%, 16V X7R ceramic
capacitors (0603)
TDK C1608X7R1C104K
10µF ±15%, 10V X5R ceramic
capacitors (0805)
TDK C2012X5R1A106K
3-pin headers, 0.1in pitch, vertical,
friction lock
20-pin, 2 x 10, right-angle female
receptacle
3-pin single-row headers
2-pin single-row headers
10-pin double-row header (2 x 5)
6-pin double-row header (2 x 3)
Not installed
n-channel 1.25W, 2.5V MOSFETs
(SOT23)
Vishay Si2302ADS
4.7kΩ ±5% resistors (0603)
PART
MAX6616EVKIT
MAX6616EVCMODU
Ordering Information
TYPE
EV kit
EV system
INTERFACE
User-supplied I
2
C
master
Windows software
C7
1
J1, J2
J3
J4, JU2
J5, J6, JU4
J7
JU1
JU3
N1, N2
R1–R4
2
1
2
3
1
1
0
2
4
Note:
The MAX6616 EV kit software is included with the
MAX6616 EV kit but is designed for use with the complete EV
system. The EV system includes both the Maxim command
module and the EV kit. If the Windows software will not be
used, the EV kit board can be purchased without the Maxim
command module.
Windows is a registered trademark of Microsoft Corp.
SMBus is a trademark of the Intel Corporation.
________________________________________________________________
Maxim Integrated Products
1
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.
MAX6616 Evaluation Kit/Evaluation System
Evaluate: MAX6616
Component List (Continued)
MAX6616 EV Kit
DESIGNATION
R5, R6
R7
R8
R9–R16
R17, R18
TP1
U1
—
—
—
QTY
2
1
1
8
0
0
1
2
1
1
DESCRIPTION
1.6kΩ ±1% resistors (0603)
Thermistor
BetaTHERM 10K3A1
10kΩ ±1% resistor (0603)
10kΩ ±5% resistors (0603)
Not installed
Not installed
MAX6616AEG (24-pin QSOP)
Shunts
MAX6616 EV kit PC board
MAX6616 EV kit software (CD-ROM)
Procedure
Do not turn on the power until all connections are
complete.
1) On the CMODUSB command module, ensure the
shunt of J1 is in the 2-3 position (3.3V).
2) Enable the I
2
C pullup resistors on the CMODUSB
command module by setting the DIP switches (SW1
on the CMODUSB board) to the
ON
position.
3) For the MAX6616 EV kit, ensure the shunts are in
the default positions as follows:
JU1: Open (I
2
C address = 0x54)
JU2: 1-2 (set POR state of the GIOP0 to high)
JU3: 1-2 (CMODUSB provide power to the
MAX6616 EV kit)
4) Carefully connect the boards by aligning the
MAX6616 EV kit’s 20-pin connector with the 20-pin
header of the CMODUSB command module. Gently
press them together. The two boards should be
flush against each other.
5) Plug the first fan to connecter J1 (FAN1).
6) Plug the second fan to connecter J2 (FAN2).
7) Set the power supply to +12V, and then turn off the
power supply.
8) Connect the (+) power terminal of the power supply
to the FVCC pad and the power supply (-) power
terminal to the GND pad next to the FVCC pad.
9) Turn on the power supply.
10) Install the MAX6616 evaluation software on your
computer by running the INSTALL.EXE program on
the installation CD-ROM. The program files are
copied and icons are created for them in the
Windows
Start
Menu.
11) Connect the included USB cable from the PC to the
CMODUSB command module. A
Building Driver
Database
window pops up in addition to a
New
Hardware Found
message. If you do not see a win-
dow that is similar to the one described above after
30 seconds, then remove the USB cable from the
CMODUSB command module and reconnect it
again. Administrator privileges are required to install
the USB device driver on Windows 2000 and XP.
12) 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\MAX6616
using the
Browse
button.
13) Start the MAX6616 EV kit software by opening its
icon in the
Start
Menu.
MAX6616 EV System
PART
MAX6616EVKIT
CMODUSB
QTY
1
1
DESCRIPTION
MAX6616 EV kit
CMODUSB command module
Component Suppliers
SUPPLIER
TDK
Vishay
PHONE
847-803-6100
408-988-8000
WEBSITE
www.component.tdk.com
www.vishay.com
Note:
Indicate you are using the MAX6616 when contacting
these component suppliers.
MAX6616 EV Kit Files
FILE
INSTALL.EXE
MAX6616.EXE
HELPFILE.HTM
FTD2XX.INF
UNINST.INI
DESCRIPTION
Installs the EV kit files on your computer
Application program
Help file
USB device driver file
Uninstalls the EV kit software
Quick Start
Recommended Equipment
• The MAX6616EVCMODU EV system
MAX6616EVKIT
•
•
•
•
2
CMODUSB command module (USB cable included)
Power supply: +12V at 3A (FVCC)
Two 12V cooling fans with tachometer (with a 3-pin
0.1in pitch and friction lock connector, I
MAX
< 1.2A)
A user-supplied Windows 98SE/2000/XP PC
A spare USB port on the PC
_______________________________________________________________________________________
MAX6616 Evaluation Kit/Evaluation System
Evaluate: MAX6616
Figure 1. MAX6616 Evaluation Software Main Window
14) Select the
Configuration
tab,
Global
subtab, click
on the checkbox
D1,
and then press the
Write
button.
15) Click on the
Enable Extended Resolution
check-
box of both
CH1
and
CH2 Temperature
Measurement
panels.
16) Click on the
Auto Read
checkbox on the lower left
of the main window. The current temperature is
updated on the top left of the main window every
second.
Detailed Description
of Software
The evaluation software’s main window shown in Figure
1 displays the device I
2
C address, device information,
and current temperature of CH1 and CH2, instanta-
neous duty cycle for both PWM1 and PWM2. On the
lower left of the main window, there are two tabs named
Status
and
Configuration
that contain most of the
MAX6616 internal registers. The
Alert
panel contains
the
FAN_FAIL
and
OT
output pins status and is located
at the lower right of the main window.
_______________________________________________________________________________________
3
MAX6616 Evaluation Kit/Evaluation System
Evaluate: MAX6616
Figure 2. Configuration Tab Gives Seven Major Subtab Options
Device I
2
C Address
The
Device I
2
C Address
combo box shown at the top-
left corner in Figure 1 displays the autodetected
MAX6616 SMBus/I
2
C address.
Temperature Measurement and PWM
Instantaneous Duty Cycle
Six commonly used registers are shown on the right
side of the main window. On the top is the
CH1
Temperature Measurement
panel that contains chan-
nel 1 temperature register (Reg00h) and channel 1
extended temperature register (Reg1Eh). Below it is the
CH2 Temperature Measurement
panel that contains
channel 2 temperature register (Reg01h) and channel 2
extended temperature register (Reg1Fh). Following is
the PWM1 instantaneous duty-cycle register (Reg0Dh)
in the
PWM1 Instantaneous Duty Cycle
panel, and
the PWM2 instantaneous duty-cycle register (Reg0Eh)
in the
PWM2 Instantaneous Duty Cycle
panel.
Device Information
There are a total of 34 documented registers inside the
MAX6616. The
Information
panel on the main window,
which is next to the
Device I
2
C Address
combo box,
shows the MAX6616’s
Manufacturer ID
(RegFFh),
Device Revision
(RegFDh), and
Device ID
(RegFEh).
4
_______________________________________________________________________________________
MAX6616 Evaluation Kit/Evaluation System
Major Tabs
The rest of the 25 registers have been grouped into two
major tabs named
Status
and
Configuration.
The
Status
tab contains four subtabs:
Fan, GPIO, OT,
and
Tachometer.
The
Configuration
tab contains
seven subtabs:
Fan, Global, GPIO, OT, PWM, Tach
Limits,
and
Thermistor.
Some subtabs have only one
register as shown in Figure 1, while others may have
multiple registers or even multiple levels of subtabs as
shown in Figure 2.
2) Under the
Configuration
tab, select the
Global
subtab. Check the
D1
(CH2
source)
checkbox and
press the
Write
button. Now temperature channel 1
monitors the external thermistor and temperature
channel 2 monitors the internal die temperature.
3) On the main window, check the
Enable Extended
Resolution
checkboxes for both
CH1
and
CH2
Temperature Measurement
panels, and click the
Auto Read
checkbox. The current temperature is
updated every second.
4) Go back to the
Configuration
tab, select the
PWM
subtab, then
Duty Cycle Dynamics.
In the
Duty
cycle Rate of Change
panel click the
Fan1
combo
box and choose 0.125s. Do the same in the
Fan2
combo box and then press the
Write
button. This
procedure causes the PWM duty cycle (and fan
speed) to change relatively quickly for easy obser-
vation. (A slower duty-cycle rate of change is typi-
cally used in real system designs to minimize the
audibility of fan-speed changes.)
5) Since the default POR values of both channels’
fan-start temperatures are 0, the fans should already
be operating. To stop them, set both channels’ fan-
start temperatures at least 10 degrees higher than
the current temperature readings.
6) Select the
Fan
subtab under the
Configuration
tab.
At the top of the subtab are the
Fan Start Temp-
erature
panels for both CH1 and CH2. Individually
set both temperature channels’ fan-start tempera-
tures to values at least 4°C higher than the current
temperature readings, and press the
Write
button of
each panel.
Wait until the fans have stopped. Observe the
instantaneous duty cycles for both PWM1 and
PWM2 decreasing to zero.
Individually set both temperature channels’ fan-start
temperatures two degrees higher than the current
temperature and press the
Write
button of each panel.
7) Use your finger or other source to heat the MAX6616
(U1) or the external thermistor (R7) on the evaluation
board. When the temperature rises above the fan-
start temperature for a given sensor, the corre-
sponding fan begins spinning.
Evaluate: MAX6616
Alert Panel
The
Alert
panel located at the right bottom corner of
the main window indicates the status of output pin
FAN_FAIL
and output pin
OT
(Figure 2).
Autoread Checkbox
There is an
Auto Read
checkbox at the bottom right
side. By checking this checkbox, all the registers are
read and updated every second.
Temperature Measurement
Both channel 1 and channel 2 temperature measure-
ments are displayed on the main window. Channel 1
monitors the temperature of an external thermistor.
Channel 2 monitors either the internal die temperature
or the temperature of an external thermistor. The
temperature measurements are capable of either 8-bit
(Reg00h for channel 1 and Reg01h for channel 2) or
11-bit extended resolution (Reg00h plus Reg1Eh for
channel 1, and Reg01h plus Reg1Fh for channel 2).
8-bit resolution results in temperature resolution of
1°C/LSB, and extended resolution results in tempera-
ture resolution of 0.125°C/LSB. Enable extended
resolution by selecting the
Enable Extended
Resolution
checkbox inside the
CH1 Temperature
Measurement
panel and/or
CH2 Temperature
Measurement
panel (Figure 2).
Automatic Fan-Control Setup Example
This section is an example of how to use the software to
set up the MAX6616 for automatic fan control.
1) Select the
Configuration
tab and the
Fan
subtab.
Check the
D2
(Fan2
Control)
and
D5
(Fan1
Control)
checkboxes inside the
Fan Configuration
panel and press the
Write
button. Fan1 is now
controlled by temperature channel 1 and Fan2 is
controlled by temperature channel 2.
_______________________________________________________________________________________
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