MAX6651EVCMAXQU [MAXIM]
Convenient On-Board Test Points;
| 型号： | MAX6651EVCMAXQU |
| 厂家： | 
MAXIM INTEGRATED PRODUCTS |
| 描述： | Convenient On-Board Test Points |
| 文件： | 总8页 (文件大小：252K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
19-1980; Rev 1; 5/07
MAX6651 Evaluation Kit/Evaluation System
General Description
Features
The MAX6651 evaluation kit (EV kit) is an assembled
and tested printed-circuit board (PCB) that demon-
strates the MAX6651 intelligent fan controller IC.
o Proven PCB Layout
o Convenient On-Board Test Points
o Fully Assembled and Tested
®
Windows 98SE/2000/XP-compatible software provides
a handy user interface to exercise the MAX6651’s fea-
tures. Order the MAX6651 EV system for complete eval-
uation of the MAX6651, including a Maxim SMBus
interface board (CMAXQUSB). Order the MAX6651 EV
kit if you already have an SMBus interface.
o EV System Includes USB Connectivity
Ordering Information
TEMP
RANGE
INTERFACE
TYPE
PART
MAX6651EVKIT
0°C to +70°C*
0°C to +70°C*
User supplied
MAX6651EVCMAXQU
Windows software
*This limited temperature range applies to the EV kit PCB only.
The MAX6651 IC temperature range is -40°C to +85°C.
SMBus is a trademark of Intel Corp.
Windows is a registered trademark of Microsoft Corp.
Component Lists
MAX6651 EV Kit
MAX6651 EV System
PART
QTY
DESCRIPTION
MAX6651 EV kit
Serial interface board
DESIGNATION QTY
DESCRIPTION
MAX6651EVKIT
CMAXQUSB+
1
1
10µF, 25V radial leaded
electrolytic capacitor
C1
1
C2
C3
0
1
Open
+Denotes lead-free and RoHS-compliant.
0.1µF ceramic capacitor (1206)
2-pin headers
J1–J5, J7–J12
LED1
11
1
Light-emitting diode
Quick Start
Recommended Equipment
Before beginning, the following equipment is needed:
2 x 10 right-angle socket
SamTec SSW-110-02-S-D-RA
P1
1
TO-220 logic-level N-channel FET
International Rectifier IRFZ24N
(Rdson < 0.1 at 5Vgs, 30Vbdss)
• MAX6651 EV system:
1
MAX6651 EV kit
Q1
Maxim CMAXQUSB interface board (USB cable
included)
1
1
1
1
1
1
5
Heatsink, thermalloy 6028
No. 4 nut
• A user-supplied Windows 98SE/2000/XP computer
4-40 x 1/4in machine screw
with a spare USB port
R1
R2
10k
1ꢀ resistor (1206)
1ꢀ resistor (1206)
5ꢀ resistor (1206)
1ꢀ resistors (1206)
• A 12VDC power supply
100k
560
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
98SE/2000/XP operating system.
R3
R4–R8
49.9k
SIP resistor network, 10k , 6 pins,
common
RP1
1
U1
—
—
1
7
1
MAX6651EEE
Shunts (J1, J5, J8–J12)
PCB: MAX6651 Evaluation Kit
________________________________________________________________ Maxim Integrated Products
1
For price, delivery, and to place orders, please contact Maxim Distribution at 1-888-629-4642,
or visit Maxim’s website at www.maxim-ic.com.
MAX6651 Evaluation Kit/Evaluation System
9) 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\MAX6651 (or the directory cho-
sen during installation) using the Browse button.
Procedure
The MAX6651 EV kit is fully assembled and tested.
Follow the steps below to verify board operation.
Caution: Do not turn on the power supply until all
connections are completed.
1) Visit the Maxim website (www.maxim-ic.com/evkit-
software) to download the latest version of the EV
kit software, 6651Rxx.ZIP.
10) Turn on the power supply. The fan will turn on at full
speed.
11) Start the MAX6651 program by opening its icon in
2) Install the MAX6651 evaluation software on your
computer by running the INSTALL.EXE program.
The program files are copied and icons are created
in the Windows Start menu.
the Windows Start menu.
12) Click the Registers panel at the top of the program.
In the Config register, drop down the full-on combo
box and choose closed-loop mode.
3) On the CMAXQUSB board, ensure the shunt of
jumper JU1 is in the 5V position.
13) In the Speed register, type in the value "100."
Adjust this value up or down to choose the target
fan speed. Increasing the Speed value makes the
closed-loop set point a slower fan speed.
4) Carefully connect the boards by aligning the 20-pin
connector of the MAX6651 EV kit with the 20-pin
header of the CMAXQUSB interface board. Gently
press them together.
14) Observe measured fan speed in the Tach0
tachometer display.
5) Also connect the 12VDC supply to the MAX6651 EV
kit at the pad labeled FAN SUPPLY ( ) (the
MAX6651’s +5V supply comes from the CMAXQUSB
board).
Detailed Description
of Software
The main window (Figure 1) shows a block diagram of
the MAX6651 EV kit, which allows the user to configure
the Fan Mode and Speed. The Registers tab (Figure
2) shows the register values of the MAX6651. Register
bit fields are presented as drop-down combo boxes.
The Speed and Tach0-3 register values are also trans-
lated into the corresponding fan (RPMs).
6) Ensure that the jumper settings are in the default
position (Table 1).
7) Connect a 12V tachometer-output fan to the
FAN0+, FAN0-, and FAN0T terminals. Additional
fans may be connected at FAN1+/FAN1-,
FAN2+/FAN2-, and FAN3+/FAN3-. Optional
tachometer inputs FAN1T, FAN2T, and FAN3T may
be used to monitor the auxiliary fans’ speed.
Detailed Description
of Hardware
U1, the MAX6651, is an intelligent fan controller. MOS-
FET Q1 regulates the fan voltage (measured by the FB
input). In closed-loop mode, adjusting the fan voltage
set point regulates the main fan’s tachometer output.
8) Connect the USB cable from the PC to the CMAX-
QUSB board. A Building Driver Database window
pops up in addition to a New Hardware Found
message. If you do not see a window that is similar
to the one described above after 30 seconds,
remove the USB cable from the CMAXQUSB and
reconnect it. Administrator privileges are required
to install the USB device driver on Windows
98SE/2000/XP. Refer to the TROUBLESHOOT-
ING_USB.PDF document included with the software
if you have any problems during this step.
PCB Layout Tips
For best results, keep the Q1 gate drive trace as short
as possible.
See Figure 3, which shows the MAX6651 EV kit
schematic, and refer to the MAX6651 IC data sheet.
2
_______________________________________________________________________________________
MAX6651 Evaluation Kit/Evaluation System
Figure 1. MAX6651 EV Kit Software Main Window (Block Diagram Tab)
_______________________________________________________________________________________
3
MAX6651 Evaluation Kit/Evaluation System
Figure 2. MAX6651 EV Kit Software Main Window (Registers Tab)
4
_______________________________________________________________________________________
MAX6651 Evaluation Kit/Evaluation System
Table 1. Jumper Functions
JUMPER
POSITION
Open*
Open*
Open*
Closed*
Closed*
Open
FUNCTION
J1
J2
J3
J4
See Table 2.
See Table 2.
See Table 2.
See Table 2.
Connect on-board LED to GPIO0 output.
J5
J7
Disconnect on-board LED from GPIO0 output.
Closed
Open*
Closed*
Open
Connect GPIO0 to GPIO1.
GPIO0 is not connected to GPIO1.
Fan 3 tachometer connects to FAN3T directly.
J8
Fan 3 tachometer connects to FAN3T through 49.9k resistor R8.
Fan 2 tachometer connects to FAN2T directly.
Closed*
Open
J9
Fan 2 tachometer connects to FAN2T through 49.9k resistor R7.
Fan 1 tachometer connects to FAN1T directly.
Closed*
Open
J10
J11
Fan 1 tachometer connects to FAN1T through 49.9k resistor R6.
Fan 0 tachometer connects to FAN0T directly.
Closed*
Open
Fan 0 tachometer connects to FAN0T through 49.9k resistor R5.
FB feedback input connects to Q1 drain directly.
FB feedback input connects to Q1 drain through 49.9k resistor R4.
Closed*
Open
J12
*Default position.
Table 2. Address Selection Jumpers
J1
J2
J3
J4
ADDRESS
1001 011R
0011 111R
1001 000R
0011 011R
Closed
Open
Open
Open*
Open
Closed
Open
Open*
Open
Open
Closed
Open*
Open
Open
Open
Closed*
*Default position.
_______________________________________________________________________________________
5
MAX6651 Evaluation Kit/Evaluation System
Figure 3. MAX6651 EV Kit Schematic
6
_______________________________________________________________________________________
MAX6651 Evaluation Kit/Evaluation System
Figure 4. MAX6651 EV Kit Component Placement Guide—Component Side
Figure 5. MAX6651 EV Kit PCB Layout—Component Side
_______________________________________________________________________________________
7
MAX6651 Evaluation Kit/Evaluation System
Figure 6. MAX6651 EV Kit PCB Layout—Solder Side
Revision History
Pages changed at Rev 1: Title change—all pages, 1–5
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.
8 _____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600
© 2007 Maxim Integrated Products
is a registered trademark of Maxim Integrated Products, Inc.
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