MAX6620EVCMAXQU+ [MAXIM]
Uses Four External Low-Cost PNP Pass Transistors;
| 型号： | MAX6620EVCMAXQU+ |
| 厂家： | 
MAXIM INTEGRATED PRODUCTS |
| 描述： | Uses Four External Low-Cost PNP Pass Transistors |
| 文件： | 总11页 (文件大小：667K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
19-4069; Rev 0; 3/08
MAX6620 Evaluation Kit/Evaluation System
Evluate:MAX620
General Description
Features
The MAX6620 evaluation system (MAX6620EVCMAXQU+)
consists of the MAX6620 evaluation kit (MAX6620EVKIT+)
and the Maxim CMAXQUSB+ command module.
Windows 2000/XP/Vista®-compatible software is also
available for use with the MAX6620 evaluation system (EV
system) and can be downloaded from the Maxim website
(www.maxim-ic.com/evkitsoftware).
♦ 3V to 5.5V Supply Voltage Range
♦ Controls Up to Four Independent Fans with Linear
(DC) Drive
♦ Uses Four External Low-Cost PNP Pass
Transistors
♦ Fan-Fail Output
The MAX6620 evaluation kit (EV kit) is a fully assembled
and tested printed-circuit board (PCB) that evaluates
the MAX6620 quad linear fan-speed controller. The
MAX6620 controls the speeds of up to four fans using
four independent linear voltage outputs. The EV kit
includes 3-pin fan headers to allow easy fan connection
and an I2C/SMBus™-compatible interface that allows
for software control of the drive voltage, tachometer
count, fan configuration, and fan dynamics.
2
♦ I C/SMBus-Compatible Interface
♦ Fully Assembled and Tested
Ordering Information
PART
TYPE
EV Kit
MAX6620EVKIT+
MAX6620EVCMAXQU+
The Maxim CMAXQUSB command module provides
the I2C/SMBus interface and is connected to the com-
puter through the universal serial bus (USB) port. The
MAX6620 EV kit software provides a graphical user
interface (GUI) for exercising the MAX6620 features.
EV System
+Denotes lead-free and RoHS-compliant.
Component Lists
MAX6620 EV System
DESIGNATION
QTY
DESCRIPTION
PART
QTY
DESCRIPTION
MAX6620EVKIT+
1
MAX6620 EV kit
I2C/SMBus interface command
module
20V, 1A, PNP silicon EPI
transistors
ON Semi BCP69T1G
Q1–Q4
4
CMAXQUSB+
1
R1–R4
R5, R6
Rꢁ
4
0
1
4
2.ꢁkΩ 5ꢀ resistors (0603)
Not installed, resistors (0603)
4.ꢁkΩ 5ꢀ resistor (0603)
10kΩ 5ꢀ resistors (0603)
MAX6620 EV Kit
DESCRIPTION
DESIGNATION
QTY
R8–R11
0.1µF 10ꢀ, 16V XꢁR ceramic
capacitors (0603)
Murata GRM188Rꢁ1C104K
TDK C1608XꢁR1C104K
Quad linear fan-speed controller
(28 TQFN-EP*, 5mm x 5mm x
0.8mm)
C1–C6
6
U1
Y1
1
1
Maxim MAX6620ATI+
J1
1
4
2 x 10 right-angle receptacle
Standard 32.ꢁ68kHz quartz
crystal, 12.5pF load capacitance
Hong Kong X’tals
3-pin headers, 0.1in pitch, vertical,
friction lock
J2–J5
JU1
1
5
2-pin header
3-pin headers
3TK032ꢁ680D1CF5GX-0A
JU2–JU6
—
6
1
Shunts
—
PCB: MAX6620 Evaluation Kit+
*EP = Exposed pad.
Windows Vista is a registered trademark of Microsoft Corp.
SMBus is a trademark of Intel Corp.
________________________________________________________________ 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.
MAX6620 Evaluation Kit/Evaluation System
Component Suppliers
SUPPLIER
Hong Kong X’tals Ltd.
PHONE
WEBSITE
+852-3511-2388
770-436-1300
602-244-6600
847-803-6100
www.hongkongcrystal.com
www.murata.com
Murata Mfg. Co., Ltd.
ON Semiconductor
TDK Corp.
www.onsemi.com
www.component.tdk.com
Note: Indicate that you are using the MAX6620 when contacting these component suppliers.
MAX6620 EV Kit Files
FILE
DESCRIPTION
INSTALL.EXE
MAX6620.EXE
Installs the EV kit files on your computer
Application program
USB driver installation help file
USB driver file
TROUBLESHOOTING_USB.PDF
FTD2XX.INF
UNINST.INI
Uninstalls the EV kit software
Evluate:MAX620
3) Carefully connect the boards by aligning the 20-pin
connector of the MAX6620EV kit with the 20-pin
header on the CMAXQUSB interface board. Gently
press them together.
Quick Start
Recommended Equipment
Before beginning, the following equipment is needed:
• User-supplied PC running Windows 2000/XP/Vista
• Available USB port
4) Connect one to four fans appropriately. Note: The
EV kit is configured for use with fans that typically
draw up to 400mA. When using larger fans, a differ-
ent pass transistor might be required for proper
operation.
• 5V/2A or 12V/2A DC power supply (VFAN)
• One to four brushless DC fans
• MAX6620 EV system
5) With power off, connect the positive terminal of the
DC power supply to the VFAN pad, and the ground
terminal to the FAN_GND pad next to VFAN.
MAX6620 EV kit
CMAXQUSB+ command module (USB cable
included)
6) Connect the USB cable from the computer’s type-A
USB port to the CMAXQUSB board’s type-B USB
port.
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
2000/XP/Vista operating system.
ꢁ) Visit www.maxim-ic.com/evkitsoftware to download
the latest version of the MAX6620 EV kit software
and install it on your computer by running the
INSTALL.EXE program. The program files are
copied and icons are created in the Windows Start
menu.
Procedure
The MAX6620 EV kit is fully assembled and tested.
Follow the steps to verify board operation. Caution: Do
not turn on the power supply until all connections
are completed.
8) Turn on the power supply and set it to 5V or 12V, as
appropriate.
1) On the CMAXQUSB command module, ensure that
the shunt on jumper JU1 is in the 3.3V position.
9) Start the MAX6620 program by opening its icon in
the Start menu.
2) To enable the on-board VCC supply, ensure that a
shunt is installed between pins 2-3 on jumper JU2
on the MAX6620 EV kit. Also, verify that the shunt
on JU1 of the EV kit is uninstalled.
10) Normal device operation is verified when CMAXQUSB
HW: Connected. MAX6620 device connected. is
displayed at the bottom left of the MAX6620 EV kit
main window (Figure 1).
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MAX6620 Evaluation Kit/Evaluation System
Evluate:MAX620
VFAN Input Setting (5V or 12V)
Detailed Description of Software
The MAX6620 EV kit software can be configured to work
User-Interface Panel
with 5V or 12V DC fans. Manually select the appropriate
The program’s main window contains two tabs, Fan
fan voltage from the VFAN drop-down list (Figure 1).
Status and Fan Configuration/Dynamics, which pro-
The default setting is for use with 12V DC fans.
vide controls for the MAX6620 EV kit software’s config-
urable features. The Fan Status tab sheet (Figure 1)
provides controls for the Global Configuration regis-
ter, TACH Count, Drive Voltage, Targets, and Faults.
The Fan Configuration/Dynamics tab sheet (Figure 2)
provides controls for Fan_ Configuration and Fan_
Dynamics. A status box is also provided at the bottom
of the program’s main window and is used to verify
command module and device connectivity.
Global Configuration
The Global Configuration group box contains several
functions that control general operation. The I2C Bus
Timeout checkbox resets the interface if SDA is low for
more than 35ms, when enabled. The Fans to 100% on
Failure checkbox, when checked, drives the fans to
full-scale drive voltage when a fan failure is detected.
The External Xtal checkbox toggles between the inter-
nal oscillator (unchecked) and the 32.ꢁ68 kHz on-board
crystal (checked).
Figure 1. MAX6620 EV Kit Software—Fan Status Tab
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MAX6620 Evaluation Kit/Evaluation System
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Figure 2. MAX6620 EV Kit Software—Fan Configuration/Dynamics Tab
I2C Watchdog
The I2C Watchdog Period drop-down list controls the
period that the watchdog monitors SDA and SCL for
valid I2C transactions. If there are no valid transactions
between the master and the MAX6620 within the watch-
dog period, all fan output voltages go to full-scale drive
voltage. The I2C Watchdog Status indicator monitors
whether a watchdog fault has occurred. This bit is
cleared when read.
TACH Count and Drive Voltage
With polling enabled, the TACH Count group box auto-
matically reads the tachometer count for each corre-
sponding fan. With polling disabled, press the Read
buttons next to each fan’s TACH_ Count label.
With polling enabled, the Drive Voltage group box
automatically reads the drive voltage for each corre-
sponding fan. With polling disabled, press the Read
buttons next to each fan’s drive voltage label. When a
fan is driven at full-scale voltage, the drive voltage label
text is displayed the in red font.
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MAX6620 Evaluation Kit/Evaluation System
Evluate:MAX620
RPM/DAC Mode
Select the appropriate RPM or DAC radio button to set
the fan to either RPM or DAC mode. In RPM mode, the
fan drive voltage is adjusted to produce the tachometer
count value in the Fan_ Target TACH Count register. In
DAC mode, the fan drive voltage is set by the value in
the Fan_ Target Drive Voltage register.
Targets
In RPM mode, the Target TACH_ Count sets the
desired tachometer count for each corresponding fan.
The MAX6620 then adjusts the fan drive voltage to
achieve this tachometer count. In DAC mode, this fea-
ture has no effect.
In DAC mode, write the desired fan drive voltage to the
Target Drive Voltage_ edit box. The MAX6620 then
drives the fan with this voltage.
Spin-up
The Spin-up drop-down list controls the period of time
that the fan is driven at full-scale voltage before reduc-
ing the drive to the selected value. The default is set
through jumper JU6.
Faults
Fan_ Status
Fan faults are detected through the fan fault register
and displayed in the Faults group box. When a fault is
detected, the Fan_ Status label changes from Ok to
Fault and displays the text in red font. Since these bits
latch until they are cleared by reading, the option to poll
bits automatically, or manually read status, is offered by
toggling the Enable Polling checkbox. Refer to the
MAX6620 IC data sheet for more information regarding
types of faults.
TACH Settings
The TACH Input Enable checkboxes enable the TACH
input function and fan-fault detection. When enabled,
select the appropriate radio button to set the TACH
input to either TACH Count or Locked Rotor. When
using locked rotor input, the Polarity can be set at high
or low.
Fan_ Dynamics
The Fan_ Dynamics group box contains controls for
individual fan speed range and DAC rate-of-change.
The # of tach cycles counted drop-down list sets the
number of complete tachometer cycles used for count-
ing the number of 8192Hz clock cycles. For example,
by default, this number is set to 4, which means that the
MAX6620 counts the number of 8192Hz clock cycles in
four complete tachometer cycles.
Fan_ Fault Mask
The Fan_ Fault Mask checkboxes give the option to
mask faults on selected fans from asserting the
FAN_FAIL hardware option. When checked, bits do not
assert the FAN_FAIL output. Faults are still indicated
through Fan_ Status.
Fan_ Configuration
The Fan_ Configuration group boxes (Figure 2) con-
figure the corresponding fan’s Spin-up conditions,
TACH Input Enable settings, and set either RPM or
DAC mode.
The DAC rate of change drop-down list determines the
time interval between output voltage increments. Note
that in RPM mode, a setting of zero would result in an
unstable feedback loop, so a default of 0.0625 is in
effect when zero is selected.
_______________________________________________________________________________________
5
MAX6620 Evaluation Kit/Evaluation System
Evluate:MAX620
Figure 3. Interface Diagnostic Window
2
Oscillator Selection
The MAX6620 EV kit gives the option to use the
MAX6620’s internal oscillator or external on-board
32.ꢁ68kHz quartz crystal (see Table 1). By default, the
chip’s internal oscillator is used. For increased accura-
cy, an external 32.ꢁ68kHz quartz crystal can be
applied by installing jumper JU1.
Simple I C/SMBus Commands
There are two methods for communicating with the
MAX6620, through the normal user-interface panel
(Figures 1 and 2), or through the SMBus commands avail-
able by selecting the Interface Diagnostic Window menu
item from the Action menu bar. The Maxim Command
Module Interface window pops up and includes a 2-wire
interface tab that allows for execution of the
SMBusSendByte() and SMBusQuick() commands.
Table 1. Jumper JU1 Functions
The SMBus dialog boxes accept numeric data in bina-
ry, decimal, or hexadecimal. Hexadecimal numbers
should be prefixed by $ or 0x. Binary numbers must be
exactly eight digits. See Figure 3 for an illustration of
this tool.
SHUNT
POSITION
X1 PIN
OSCILLATOR
Connected to X2
through Y1
External 32.768kHz
quartz crystal
Installed
Detailed Description of Hardware
Jumper Settings
Several jumper settings in the following tables illustrate
features of the MAX6620 EV kit.
Internal oscillator
used
Not installed*
Open
*Default position.
6
_______________________________________________________________________________________
MAX6620 Evaluation Kit/Evaluation System
Evluate:MAX620
VCC Power Supply
The MAX6620 gives the option to power VCC through
the CMAXQUSB module or through an external supply.
This can be accomplished through setting jumper JU2
(see Table 2). By default, the MAX6620’s VCC supply is
powered through the CMAXQUSB module, eliminating
the need for an external VCC supply.
DAC Startup Conditions
The MAX6620 samples the DAC_START input when
power is first applied and sets the power-up value for
the fan drive voltage based on jumper JU5 configura-
tion. By default, the DAC_START pin is connected to
VCC, setting the initial fan drive voltage to VFAN.
Table 5. Jumper JU5 Functions
Table 2. Jumper JU2 Functions
SHUNT
VCC PIN
POSITION
SHUNT
POSITION
INITIAL FAN DRIVE
VOLTAGE
DAC_START PIN
1-2*
Connected to VCC
Open
VFAN
0.75 x VFAN
0V
1-2
External 3.0V to 5.5V supply required
Powered from CMAXQUSB module
Not installed
2-3
2-3*
Connected to GND
*Default position.
*Default position.
I2C Slave Address Selection
Initial Spin-Up Behavior
The MAX6620 is programmable to one of three I2C
slave addresses through jumper JU3 (see Table 3). The
address is defined as the ꢁ most significant bits (MSBs)
followed by the read/write bit.
The initial spin-up behavior of the MAX6620 is sampled
at the input of SPIN_START when power is first applied.
Initial spin-up behavior can be set through jumper JU6
at power-up (see Table 6 for spin-up configuration). It is
also possible to modify spin-up behavior by writing
appropriate settings to the MAX6620’s registers. By
default, the initial spin-up feature is disabled.
Table 3. Jumper JU3 Functions
SHUNT
POSITION
ADD PIN
ADDRESS
Table 6. Jumper JU6 Functions
1-2
Connected to VCC
Open
0x54
0x52
0x50
SHUNT
INITIAL SPIN-UP
BEHAVIOR
Not installed
2-3*
SPIN_START PIN
POSITION
Connected to GND
Full-scale drive
voltage until two
tachometer pulses,
or 1s has elapsed
*Default position.
1-2
Connected to VCC
I2C Watchdog (WD) Startup Conditions
The MAX6620 I2C watchdog function (see Table 4)
monitors SDA and SCL when enabled at startup by
configuring jumper JU4. When this feature is enabled
and 10s elapse without a valid I2C transaction, the fan
drive goes to 100ꢀ. The watchdog function is disabled
by default.
Full-scale drive
voltage until two
tachometer pulses,
or 0.5s has elapsed
Not installed
Open
2-3*
Connected to GND
Spin-up disabled
*Default position.
Table 4. Jumper JU4 Functions
SHUNT
POSITION
WD_START PIN
WD FUNCTION
1-2
2-3*
Connected to VCC
Connected to GND
Enabled
Disabled
*Default position.
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MAX6620 Evaluation Kit/Evaluation System
Evluate:MAX620
Figure 4. MAX6620 EV Kit Schematic
8
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MAX6620 Evaluation Kit/Evaluation System
Evluate:MAX620
Figure 5. MAX6620 EV Kit Component Placement Guide—Component Side
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MAX6620 Evaluation Kit/Evaluation System
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Figure 6. MAX6620 EV Kit PCB Layout—Component Side
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MAX6620 Evaluation Kit/Evaluation System
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Figure ꢁ. MAX6620 EV Kit PCB Layout—Solder Side
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.
Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 ____________________ 11
© 2008 Maxim Integrated Products
is a registered trademark of Maxim Integrated Products, Inc.
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