MAX31790 Evaluation Kit Evaluates: MAX31790
General Description
The MAX31790 evaluation kit (EV kit) provides the hard-
ware and software graphical user interface (GUI) neces-
sary to evaluate the MAX31790 6-channel PWM-output
fan RPM controller. The EV kit includes a MAX31790ATI+
installed, as well as a USB-to-I2C interface.
The USB-to-I2C master section on the EV kit labeled
“MAXIM DS3900U HID” can be used to interact with the
EV kit software and exercise the device’s functionality.
The EV kit provides headers and test points to connect
user-supplied fans, but does not come with a fan included.
EV Kit Contents
● Assembledcircuitboardincludingthe
MAX31790ATI+ and USB-to-I2C circuitry
● Mini-USBcable
Features
● EasyEvaluationoftheMAX31790
● USBHIDinterface
● WindowsXP®-, Windows Vista®-, and Windows®
7-Compatible Software
● RoHSCompliant
● ProvenPCBLayout
● FullyAssembledandTested
19-6552; Rev 0; 12/12
Ordering Information appears at end of data sheet.
EV Kit Photo
Windows, Windows XP, and Windows Vista are registered
trademarks and registered service marks of Microsoft
Corporation.
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Component List
DESIGNATION QTY DESCRIPTION
B1 1 Green banana jack
Deltron 571-0500
B2 1 Black banana jack
Deltron 571-0100
B3 1 Yellow banana jack
Deltron 571-0700
C1 1
0.1µF±10%,100VX7Rceramic
capacitor (0805)
TDK CGA4J2X7R2A104K
C1I, C6I, C7I,
C11I, C13I 5
0.1µF±10%,25VX7Rceramic
capacitors (0603)
TDK C1608X7R1E104K
C2I, C5I 2
4.7µF±10%,6.3VX5Rceramic
capacitors (0603)
TDK C1608X5R0J475K
C3 1
4.7µF±10%,50VX5Rceramic
capacitor (0805)
TDK CGA4J3X5R1H475K
C3I, C9I, C10I,
C12I 4
1.0µF±10%,16VX7Rceramic
capacitors (0603)
Murata GRM188R71C105K
C4 1
6.8µF±20%,50Vtantalum
capacitor (2812)
Vishay 595D685X0050C2T
C4I, C8I 2
0.01µF±10%,50Vceramic
capacitors (0603)
Murata GRM188R71H103K
C8, C9 2
12pF±05%,100Vceramic
capacitors (0805)
AVX 08051A120JAT2A
C14I 1
220nF±10%,10VX7Rceramic
capacitor (0603)
TDK C1608X7R1A224K
D1I 1 RedLED(1206)
Knightbright APTR3216EC
D2I 1
DualLED(0805)
Kingbright
APHBM2012SURKCGKC
D3I 1 Schottkydiode(MINI2-F1)
Panasonic-SSGDB2W31900L
D7, D8 2 RedLEDs(1206)
Knightbright APTR3216EC
DESIGNATION QTY DESCRIPTION
J1, J101, J201,
J301, J401,
J501, J601
72-pin headers, 2.54mm pitch
3M 961102-6404-AR
J1I 1 USB_ 5-pin female header
Molex 54819-0519
J2–J4, J7, J8 5 3-pin headers, 2.54mm pitch
3M 961103-6404-AR
J2I, J3I 2 Solder bridges
J5, J6 2
8-pin (2 x 4) headers,
2.54mm pitch
3M 961208-6404-AR
J11 15-pin BNC TE connector
AMP 5227161-1
J100, J200,
J300, J400,
J500, J600,
J700, J800,
J900, J1000,
J1100, J1200
12 4-pin headers, 2.54mm pitch
3M 961104-6404-AR
Q1I 1 nMOS (SOT323)
ON Semi NTS4001NT1G
R1–R4, R101,
R103, R201,
R203, R301,
R303, R401,
R403, R501,
R503, R601,
R603
16 4.7kΩ±1%resistors(0805)
VishayCRCW08054K70FKEA
R1I, R7I, R8I 3 330Ω±1%resistors(0603)
VishayCRCW0603330RFKEA
R2I, R3I 2 24.9Ω±1%resistors(0603)
VishayCRCW060324R9FKEA
R4I 1 100kΩ±1%resistor(0603)
VishayCRCW0603100KFKEA
R5, R6 2 1.21kΩ±1%resistors(0805)
VishayCRCW08051K20FKEA
R5I, R6I 2 10kΩ±1%resistors(0603)
VishayCRCW060310K0FKEA
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Component List (continued)
*EP = Exposed pad.
MAX31790 EV Kit Files
Note: The .EXE file is downloaded as a .ZIP file.
Quick Start
Required Equipment
● MAX31790EVkit
● User-suppliedWindowsXP,WindowsVista,or
Windows 7 PC with USB port
● Mini-USBcable(included)
● EVkithardware(included)
● User-supplied3.3Vpowersupply(300mAminimum)
● User-supplied12VVFANpowersupply
● User-suppliedDCfan
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.
Setup Procedure
TheEVkitisfullyassembledandtested.Followthesteps
below to verify board operation:
1) Place the EV kit hardware on a nonconductive
surface to ensure that nothing on the PCB gets
shorted to the workspace.
2) Ensure that jumper/shunt J1 is installed, which
provides power to the device.
3) Check the following startup configuration jumpers/
shunts, which result in the associated behavior:
a. J8 (PWM_START1) = GND and J7 (PWM_
START0) = VCC. Defines a power-on-reset (POR)
PWMdutycycleof75%.
b. J2(FREQ_START)=VCC.DefinesaPORPWM
frequency of 25kHz.
c. J3 (SPIN_START) = VCC. Defines the POR spin-
upbehaviorfor100%dutycycleuntiltwotachom-
eter pulses or 1s (MAX).
d. J4 (WATCHDOG_START) = GND. Defines a
disabled I2C watchdog on POR.
e. J5 (ADD0) = GND and J6 (ADD1) = GND. Defines
a POR slave address of 40h.
DESIGNATION QTY DESCRIPTION
R7–R10, R100,
R200, R300,
R400, R500,
R600
10 0Ω±1%resistors(0805)
VishayCRCW0805000RFKEA
R9I 1 2.2kΩ±1%resistor(0603)
VishayCRCW06032K20FKEA
R10I 1 4.7kΩ±1%resistor(0603)
VishayCRCW06034K70FKEA
R11 1100Ω±10%resistor(0805)
VishayCRCW0805100RFKEA
TP1–TP5,
TP22–TP28,
TP40–TP57
30 White test points
Keystone 5012
TP6–TP8,
TP30–TP35 9Black test points
Keystone 5011
TP29 1 Red test point
Keystone 5010
TP37 1 Yellow test point
Keystone 5014
DESIGNATION QTY DESCRIPTION
U1 1 Fancontroller(28TQFN-EP*)
Maxim MAX31790ATI+
U1I 1 Current-limit switch (5 SOT70)
Maxim MAX4787EXK+
U2I 1 Linearregulator(5SOT23)
Maxim MAX8868EUK33+
U3I 1 USB transceiver (16 TSSOP)
Maxim MAX3344EEUE+
U4I 1 FXMA108
FairchildFXMA108BQX
U5I 1 PIC
MicrochipPIC18LF2550-I/SO
X1 1 12pFcrystal
Epson C-002SH 32.7680KA-A
X1I 1 4-pin CMOS oscillator
AVX KC3225A48.0000C30E00
— 1
PCB:MAX317906FAN
CONTROLLER,
12FANMONITOR
FILE DESCRIPTION
MAX31790EVKitSoftware.EXE Application program
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4)
Ensure that jumpers/shunts J101, J201, J301, J401,
J501, and J601 are installed, which connects the asso-
ciatedPWMOUTsignaltotheFan1–Fan6headers.
5) Connect a 3.3V power supply to the VCC and GND
banana jacks.
6) Connecta12VpowersupplytotheVFANandGND
banana jacks.
7) Prior to starting the GUI, connect the EV kit hard-
ware to a PC using the supplied mini-USB cable, or
equivalent.TheCOMLED(D2l)shouldberedand
slowly flash orange.
8) Windows should automatically begin installing the
necessary device driver. The USB interface of the
EV kit hardware is configured as an HID device and
therefore does not require a unique/custom device
driver. Once the driver installation is complete, a
Windows message appears near the System Icon
menu indicating that the hardware is ready to use.
Do not attempt to run the GUI prior to this message.
If you do, then you must close the application and
restart it once the driver installation is complete. On
some versions of Windows, administrator privileges
may be required to install the USB device.
9) Once the device driver installation is complete,
visit www.maximintegrated.com/evkitsoftware to
download the latest version of the EV kit software,
MAX31790EVKitSoftware.zip. Save the EV kit soft-
ware to a temporary folder.
10) Open the .ZIP file and extract the .EXE file to your
desired location. The .EXE file is the actual EV kit
GUI and not an install program. You can store the
.EXE wherever you like and then uninstall it later by
simply deleting the .EXE file.
11) Double-click on the .EXE file to run the GUI. A
message box stating The publisher could not be
verified. Are you sure you want to run this soft-
ware? may appear. If so, click Run.
12) When the GUI appears, proper communication to
the USB-to-I2C master is indicated in the lower right
corner below the Status box by a text string stating
DS3900 Connected.TheCOMLED(D2l)nowturns
off and flashes red when communication occurs.
13) To verify communication to the device, with the
default jumper/shunt settings described in steps 2–4,
press the UpdateDashBoard button on the top right
corner and verify the PWM Frequency updates to
25kHz and all Duty Cycle valuesupdateto75.15%,
as shown in Figure 1. This completes the EV kit
setup. The hardware and software are ready to begin
evaluating the device. If any issues arise, see the
Troubleshooting section.
Detailed Description of Software
GUI Status Box
On the bottom right side of the GUI is the Status group
box. It is used to relay information to the user and is
cleared with the associated Clear Button. The text box
below the Status label indicates the status of the com-
munication between the GUI and the EV kit hardware.
If everything is working properly, a message indicates
DS3900 Connected; otherwise, the display shows a yield
sign and DS3900 Disconnected!!
Device Conguration
Upon successful completion of the setup procedure,
the user is ready to begin evaluation of the device. The
device’s POR behavior is set by the power-up configura-
tion pins and the default POR values, as defined in the
MAX31790 IC data sheet. The USB-to-I2C master com-
municates to the Slave ID (hex) shown in the DashBoard
in the upper right side of the GUI. To change the target
slave address, enter the new value into the input field and
press the Set button.
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Figure 1. MAX31790 EV Kit GUI (Main Tab)
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Figure 2. MAX31790 EV Kit GUI (FanChannel1 Tab)
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Figure 3. MAX31790 EV Kit GUI (Fan Faults Tab)
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Reads
Each register of the device can be read from the GUI
by the simple press of the associated Read button. The
registers are located in one of the tabs as defined below:
● Main Tab (Figure1):
● GlobalConfigurationregister
● PWMFrequencyregister
● FanChannel1–6 Tabs (Figure2):
● FannConfigurationregister(wherendenotesthe
channel)
● FannDynamicsregister
● TachnCountregister
● PWMOUTnDutyCycleregister
● PWMOUTnTargetDutyCycleregister
● TACHnTargetDutyCycleregister
● WindownRegister
● Fan Faults Tab (Figure3):
● FanFaultStatus1register
● FanFaultStatus2register
● FanFaultMask1register
● FanFaultMask2register
● FailedFanOptions/SequentialStartregister
Pressing a Read button performs a single read of the
register(s) and updates the associated data fields. There
is also an option to do continuous reads of the device.
This AutoRead feature is located in the upper right
section of the GUI. To start polling at a 1Hz frequency,
press the Start AutoRead button. Each poll reads all
registers shown in the dashboard and the active tab then
updates the associated data fields. Once the continuous
reads start, the button text changes to Stop AutoRead
for the user to stop the reads. It is not recommended
to change register parameters through a write while
AutoRead is enabled.
The GUI provides a very simple way to dump all the
device registers to a text (.TXT) file. Under the Main Tab
sheet, press the Register Dump button and provide a
folder and file name. An example of a Register Dump is
showninFigure4.
Figure 4. MAX31790 Data Table
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Writes
Each register of the device can be written to/from the GUI
either by the simple click on the radio button or the input
of a decimal value followed by a press of the associated
Write button. The writable registers are located in one of
the tabs, as defined in the previous Reads section.
Clicking on any radio button or drop-down list automati-
cally writes the selected value to the device. To verify a
successful write, perform a read that then updates the
field. To write a register that requires a numerical value,
such as TACH n Target Count or PWMOUT n Target
Duty, enter the decimal value desired for the non-
reserveddatabitsoftheregisters.Forexample,towrite
PWMOUT 1 Target Duty Cycle to a value of 39%, or
200 decimal (refer to the MAX31790 IC data sheet for
bit weighting), click on the FanChannel1 tab and enter
200 in the input box located to the left of the PWMOUT
1 Target Duty Cycle(40-41h) label and press the Write
(40-41h) button. This writes 64h to register 40h and 00h
to register 41h. Verify the write by pressing the Read
PWM Register button.
The GUI provides a very simple way to load all the device
registers from a text (.TXT) file. Under the Main Tab
sheet, press the Register Load button and provide a
previously saved Register Dump file or a modified
version of a previous dump. The register load file must
have the same format as the GUI-generated dump file.
General I2C Tab
The GUI provides a generic I2C tab (I2CMemory), which
is not required to evaluate the device. Use this tab if a
more flexible I2C transaction is required.
FULL_SPEED Input Signal Control
The GUI provides a method to control the FULL_SPEED
input to the device. On the right side of the GUI in the
DashBoard group box, there is a FULL_SPEED# section
with two radio buttons that toggles the logic level of this
signal between high and low.
FAN_FAIL Output Signal Monitor
The GUI provides a method to monitor the FAN_FAIL
output of the device. In the DashBoard group box, there
is a FAN_FAIL# Pin section that changes to reflect the
logic level of this signal.
Detailed Description of Hardware
User-Supplied Fans
The MAX31790 EV kit provides the flexibility to control
the speeds of up to six fans or monitor up to 12 fans.
The EV kit contains 12 fan headers (100 mil spacing) that
fans connect to. Refer to the MAX31790 IC data sheet
for various examples of fan configurations. Connect fans
tothecorrectGND,VFAN,TACH,andPWMheaders.In
a closed-loop fan-control configuration on FAN1–FAN6,
thejumper/shuntPWMn/FANn(J101,J201,J301,J401,
J501, and J601) must be populated. This connects the
PWM signal from the device to the fan header. To use
PWM outputs as tachometer inputs, open-loop monitor
configuration, on fan channel 1 for example, remove the
jumper/shuntonPWM1/Fan1(J101)andattachafanto
theFan1/Fan7headers.ConnectthedesiredPWMsignal
forFan1to thePWM1header and connectthedesired
PWM signal for Fan7 to the PWM7 test point. Properly
configure the device through the I2C port to reflect the
hardware configuration.
User-Supplied I2C interface
The USB-to-I2C master section of the EV kit is not
necessary for the proper operation of the device. If the
user wants to supply the I2C interface, the USB-to-
I2C master section of the EV kit can be disconnected
by removing resistors R7 and R8. Connect test points
SDA,SCL,andGND.TheFULL_SPEED and FAN_FAIL
signals from the device can also be routed to a different
master by removing resistors R9 and R10 and connecting
to the FULL_SPD, FAN_FAIL, and GND test points.
Change Startup Conguration Jumpers
All the startup configuration jumpers (J2–J8) are located
on the left side of the PCB and partitioned off by silk-
screen labeled STARTUP CONFIGURATION. Refer to
the MAX31790 IC data sheet for resulting device opera-
tion. After changing jumper configurations, a device POR
or a setting of the Reset bit in the Global Configuration
register is required for new configurations to take effect.
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Table 1. Hardware Configurations
Table 2. Description of LEDs
HARDWARE ACTION COMPONENTS DESCRIPTION
Connect user-supplied
Fan1–Fan6
J100, J200, J300, J400,
J500, J600,
Connectauser-suppliedfantothecorrectGND,VFAN,TACH,and
PWM headers.
Connect user-supplied
Fan7–Fan12
J700, J800, J900, J1000,
J1100, J1200
Connectauser-suppliedfantothecorrectGND,VFAN,TACH,and
PWM headers.
Connect FULL_SPEED
and FAN_FAIL pins to
user-supplied interface
R9, R10 Remove resistors R9 and R10 and connect to the FULL_SPD and
FAN_FAIL test points.
Connect user-supplied
I2C interface R7, R8 Remove resistors R7 and R8 and connect to user-supplied I2C
interface to test points.
Change startup
congurationjumpers J2–J8 Adjust the jumper/shunt positions according to the silkscreen labels.
LED COLOR DESCRIPTION
D1l(FAULT) Red USB Power Fault: A fault occurred due to overvoltage limit, current limit,
or thermal limit.
D2l (COM)
Red Communication:Afterthesoftwarehasinitializedthehardware,theLEDashes
red when a command from the PC is received.
Off Initialized: Hardware has been initialized by software.
Red and
FlashingOrange Waiting: Hardware is powered on and waiting for the software to be opened.
D6 Red FULL_SPEED:LEDconnectedtotheactive-lowFULL_SPEEDinput.LEDturns
red when the FULL_SPEED signal is logic-low.
D7 Red FAN_FAIL:LEDconnectedtotheactive-lowopen-drainFAN_FAILoutput.LED
turns red when the FAN_FAIL signal is logic-low.
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Troubleshooting
All efforts were made to ensure that each EV kit works on the first try, right out-of-the-box. In the rare occasion that a
problem is suspected, see Table 3 to help troubleshoot the issue.
Table 3. Troubleshooting
SYMPTOM CHECK SOLUTION
GUI indicates: Hardware
not found
IstheLEDlabeledD1lred?
If yes, then the electronic fuse is in a fault state. Inspect for electrical
shorts on the PCB and make sure that the PCB is not sitting on a
conductive surface.
DoestheLEDlabeledD2l
turn off when the GUI is
running?
If not, then exit the GUI and try running it again. If D2l still does not
turn off, then exit the GUI and power cycle the board by removing
and reapplying the user-supplied power source. Try connecting the
USB cable to a different USB port on the PC and wait for a Windows
message that states that the hardware is ready to use. Run the GUI
again. If D2l still does not turn off, unplug the USB cable and reboot
the PC. Connect the USB cable and open the GUI.
AreanyoftheLEDs
illuminated?
If not, then the PCB may not be getting power from the user-
supplied power supply. Verify the power-supply bias with a voltmeter,
measuring from VCC to GND. Valid levels are 3V to 5.5V.
GUI Status indicates: Error
communicating with the
MAX31790
Slave address jumper
conguration(J5,J6)
Checkthecurrentsettingoftheslaveaddressjumpercongurations
(J5, J6) and input the resulting slave address in the Slave ID (Hex)
input box, then pressing the Set button.
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Figure 5a. MAX31790 EV Kit Schematic (Sheet 1 of 4)
R1
4.7k
R2
4.7k
R3
4.7k
R4
4.7k
R5
1.21k
R6
1.21k
D7
FanFail
D8
FullSpeed
1
2
3
J4
WD_START
1
2
3
J3
SPIN_START
1
2
3
J2
FREQ_START
1
2
3
J8
PWM_START1
1
2
3
J7
PWM_START0
TP26
PWM_STRT1
1B3
VFAN
VCC
VCC
GND GND
VCC
VCC
GND
VCC
GND
VCC
GND
GNDGND
VCCVCC
TP25
PWM_ST RT0
TP1
FRQ_STRT
TP2
SPN_STRT
TP3
WD_STRT
TP 4
ADD0
TP 5
ADD1
1
B1 VCC = 3.3V
1
B2
GND
1
2
J1
VCC JUMPER
C2
DNP
C1
0.1uF
GND
VCC
X1
CRYSTAL 12pF
+
C4
4.7uF 50VOLT
C3
4.7uF 50VOLT
VF AN
200 MIL TRACE
PWM_START1PWM_START0
FREQ_START
SPIN_START
WD_START
ADD1
A D D0
SDA
SCL
SDA
SCL
SDA
SCL
FAN_FAIL#
FULL_SPEED#
TP 22
SDA
TP 23
SCL
TP 24
FAN_FAIL#
TP 27
FULL_SPD#
SDA
SCL
TP 6
GND
TP 8
GND
TP 7
GND
TP 30
GND
TP 31
GND
TP 32
GND
TP 33
GND
TP 29
VCC
PWMOUT4
TACH4
PWMOUT5
TACH5
PWMOUT6
TACH6
PWM_START0
PWM_START1
CL KOUT
FREQ_START
SPIN_START
WD_START
ADD0
ADD1
PWMOUT1
TACH1
PWMOUT2
TACH2
PWMOUT3
TACH3
TP 37
VF AN
TP 34
GND
TP 35
GND
SL AVE ADDR= 40h - 5Eh
GND
RedLEDs
TP 28
CL KOUT
1
2
J11
CL KOUT
GND
R70
R80
R100
R90
C8
12pF
C9
12pF
GND
R11
100
VDUT
GNDDUT
FRQ_STRT:
GND = 30Hz
UNCONNECTED = 1.47 kHz
VCC = 25kHz
SPIN_STRT:
GND = NO SPIN-UP
UNCONNECTED = 0.5s MAX
VCC = 1.0s MAX
WD_STRT:
GND = NO WATCHDOG
VCC = 30s
POR CONDITION
PWM_STRT0 PWM_STRT1 PWM DUTY CYCL E (%)
GND GND
GND UNCONNECTED 30
GND VCC
UNCONNECTED GND 50
UNCONNECTED VCC 60
VCC GND
VCC VCC
1 2
3 4
5 6
7 8
J5
HDR_8P IN
1 2
3 4
5 6
7 8
J6
HDR_8P IN
FREQ_START
1
SPIN_START
2
XTAL2
6
ADD0
4
WD_START
5
ADD1
3
XTAL1
7
GND8
TACH69
PWMOUT610
TAHC511
PWMOUT512
TACH413
PWMOUT414
TACH315
PWMOUT316
TACH217
PWMOUT218
TACH119
PWMOUT120
VCC21
SDA
22
SCL
23
FAN_FAIL
24
PWM_START0
25
PWM_START1
26
FULLSPEED
27
CL KOUT
28
F
R
E
Q
_
S
T
A
R
S
P
I
N
_
S
T
A
R
T
X
T
A
L
2
A
D
D
0
W
D
_
S
A
R
T
A
D
D
1
X
T
A
L
1
GN
D
T
A
C
H
6
P
W
MOUT
6
T
AHC
5
P
W
MOUT
5
T
A
C
H
4
P
W
M
OU
T
4
T
A
C
H
3
P
W
M
O
U
T
3
T
A
C
H
2
P
W
M
O
U
T
2
T
A
C
H
1
P
W
M
O
U
1
V
C
C
S
DA
SC
L
F
AN
_
F
A
I
L
P
W
M
_
START
0
P
W
M
_
START
1
F
U
L
L
S
P
EE
D
C
L
K
OU
T
U1
MAX31790
SDA
SCL
FAN_FAIL#
FULL_SPEED#
PWM_ST ART0
PWM_START1
CLKOUT
FREQ_START
SPIN_START
WD_START
ADD0
ADD1
PWMOUT4
TACH4
PWMOUT5
TACH5
PWMOUT6
TACH6
GND
PWMOUT1
TACH1
PWMOUT2
TACH2
PWMOUT3
TACH3
VDUT
This is the through hole footprint for the SM placement on PC
1
2
3
4
5
6
7
J9A
DNP (28 PIN ROUND DB)
8
9
10
11
12
13
14
J9B
28 PI N ROUND DB
15
16
17
18
19
20
21
D
J9C
28 PI N ROUND DB
22
23
24
25
26
27
28
J9D
28 PI N ROUND DB
FAN_FAIL#
FULL_SPEED#
SDA_PIC
SCL _PIC
P7
P6
SL AVE ADDRESS SEL ECT PINS
CONFIGURE POWER UP
SAMPLED PIN
ADDITIONAL TE ST PO IN TS
EV KIT LAYOUT NOTE: Use recom mended PCB layout for crystal traces
MAX31790 Circuitr
y
Maxim Integrated
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MAX31790 Evaluation Kit Evaluates: MAX31790
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Figure 5b. MAX31790 EV Kit Schematic (Sheet 2 of 4)
R100
0
R103
4.7k
R102
DNP
R101
4.7k
C101
DNP
C100
DNP
VCC
GND
TP 40
TACH1
VCC
GND
TP 41
PWMOUT1
2
3
4
1
J100
FAN1 HEADER
200 MIL TRACEVF AN
VF AN
TACH1
PWMOUT1
1
2
J101 PWM1 2
3
4
1
J700
FAN7 HEADER
TP 42
PWM7
D1
DNP (5.5V ZENER)
GND
TACH7
PWM7
VF AN
GND
R200
0
R203
4.7k
R202
DNP
R201
4.7k
C201
DNP
C200
DNP
VCC
GND
TP 43
TACH2
VCC
GND
TP 44
PWMOUT2
2
3
4
1
J200
FAN2 HEADER
200 MIL TRACEVF AN
VF AN
TACH2
PWMOUT2
1
2
J201 PWM2 2
3
4
1
J800
FAN8 HEADER
TP 45
PWM8
D2
DNP (5.5V ZE N E R )
GND
TACH8
PWM8
VF AN
GND
R300
0
R303
4.7k
R302
DNP
R301
4.7k
C301
DNP
C300
DNP
VCC
GND
TP 46
TACH3
VCC
GND
TP 47
PWMOUT3
2
3
4
1
J300
FAN3 HEADER
200 MIL TRACEVF AN
VF AN
TACH3
PWMOUT3
1
2
J301 PWM3 2
3
4
1
J900
FAN9 HEADER
TP 48
PWM9
D3
DNP (5.5V ZENER)
GND
TACH9
PWM9
VF AN
GND
GND
GND
GND
FAN 1 - 3 AND 7 - 9 HEADERS
Maxim Integrated
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MAX31790 Evaluation Kit Evaluates: MAX31790
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Figure 5c. MAX31790 EV Kit Schematic (Sheet 3 of 4)
R400
0
R403
4.7k
R402
DNP
R401
4.7k
C401
DNP
C400
DNP
VCC
GND
TP 49
TACH4
VCC
GND
TP 50
PWMOUT4
2
3
4
1
J400
FAN4 HEADER
200 MIL TRACEVF AN
VF AN
TACH4
PWMOUT4
1
2
J401 PWM4 2
3
4
1
J1000
FAN10 HEADER
TP 51
PWM10
D4
DNP (5.5V ZENER)
GND
TACH10
PWM10
VF AN
GND
R500
0
R503
4.7k
R502
DNP
R501
4.7k
C501
DNP
C500
DNP
VCC
GND
TP 52
TACH5
VCC
GND
TP 53
PWMOUT5
2
3
4
1
J500
FAN5 HEADER
200 MIL TRACEVF AN
VF AN
TACH5
PWMOUT5
1
2
J501 PWM5 2
3
4
1
J1100
FAN11 HEADER
TP 54
PWM11
D5
DNP (5.5V ZENER)
GND
TACH11
PWM11
VF AN
GND
R600
0
R603
4.7k
R602
DNP
R601
4.7k
C601
DNP
C600
DNP
VCC
GND
TP 55
TACH6
VCC
GND
TP 56
PWMOUT6
2
3
4
1
J600
FAN6 HEADER
200 MIL TRACEVF AN
VF AN
TACH6
PWMOUT6
1
2
J601 PWM6 2
3
4
1
J1200
FAN12 HEADER
TP 57
PWM12
D6
DNP (5.5V ZENER)
GND
TACH12
PWM12
VF AN
GND
GND
GND
GND
FAN 4 - 6 AND 10 - 12 HEADER
S
Maxim Integrated
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MAX31790 Evaluation Kit Evaluates: MAX31790
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Figure 5d. MAX31790 EV Kit Schematic (Sheet 4 of 4)
MCL R
1
P3,HB
2
COM_L ED,BOOT
3
P1
4
P2
5
RCV
6
P6, CS
7
GND
8
OSC1
9
OSC2
10
P4
11
UOE
12
PS_VAR
13
VUSB
14 D-,VM 15
D+,VP16
ENUM 17
P9,SDO 18
GND19
VDD20
P11,SDI ,SDA21
P10,SCK ,SCL 22
VMO23
VP O24
USB_DET 25
P5 26
P7,1W_DQ 27
P8,1W_PU 28
U5I
PICfor DS3900
Vbus 1
D- 2
D+ 3
I.D. 4
GND 5
J1I
USB_5P IN
OUT1
GND 2
FLAG 3
ON
4
IN
5
MAX4787EXK +TCT- ND
U1I
MAX4787
SHDN
1
GND
2
IN
3OUT 4
BP 5
U2I
MAX8868EUK 33-T
D1I
LED
R1I330
R2I 24.9
R3I 24.9
R7I
330
R8I
330
R9I
2.2k
C5I
4.7uF
C13I
0.1uF
C12I
1.0uF
C2I
4.7uF
C1I
0.1uF
C3I
1.0uF
C14I
220nF
C4I
0.01uF
GNDGND
D-
D+
VBUS
GND
5V
GND
3.3V
RCV
1
VP O
2
MODE
3
VMO
4
OE
5
SUSP
6
VP I
7
VMI
8ENUM 9
VCC10
GND 11
D- 12
D+ 13
VTRM 14
VL 15
USB_DET16
RC
V
V
P
O
MO
D
E
VM
O
O
E
S
U
S
P
V
P
I
VM
I
E
NU
M
V
C
C
GN
D
D
-
D
+
V
T
R
M
V
L
U
S
B
_D
E
T
U3I
MAX3344E
VCCA
1
A0
2
A1
3
A2
4
A3
5
A4
6
A5
7
A6
8
A7
9
GND
10 OE 11
B7 12
B6 13
B5 14
B4 15
B3 16
B2 17
B1 18
B0 19
VCCB 20
V
CC
A
A
0
A
1
A
2
A
3
A
4
A
5
A
6
A
7
GN
D
O
E
B
7
B
6
B
5
B
4
B
3
B
2
B
1
B
0
V
CC
B
U4I
FXMA108
RCV 3V3
VP O 3V3
VMO 3V3
OE 3V3
VP I 3V3
VMI 3V3
USB_DET 3V3
D+
D-
ENUM 3V3
GND
3.3V
5V
C10I
1.0uF
C9I
1.0uF
C11I
0.1uF
GND
3.3V
VTRM
3.3VVCC
C6I
0.1uF
C7I
0.1uF
GND
ENUM 3V3
VMI 3V3
OE 3V3
VMO 3V3
VP O 3V3
RCV 3V3
USB_DET 3V3
VP I 3V3
USB_DET VDUT
RCV VDUT
VP O VDUT
VMO VDUT
OE VDUT
VP I VDUT
VMI VDUT
ENUM VDUT
R6I
10k
GND
GND
R4I
100k
R5I
10k
GND
GND
VCC
VCCOE VDUT
RCV VDUT
USB_DET VDUT
VP O VDUT
VMO VDUT
ENUM VDUT
VP I VDUT
VMI VDUT
VCC
GND
P7
P6
GND
SCL _PIC
SDA_PIC
R10I
4.7k
1
2
J4I
GND
VP P
COM
CL K 3V3
C8I0.01uF
3.3V
GND
CL K VDUT
VCC
CL K VDUT
INH
1
GND
2OUT3
VCC4
I
N
H
GN
D
OU
T
V
C
C
X1I
OSC_CMOS_4pin
1
2
D3I
Green
D2I B
Red
D2I A
J3IJ2I
100mA current
limiting switch.
3.3V Linear Regulator,
150mA ma x
USB Transceiver. Converts
USB signals to logical
signals. The high level for
the logical signals is 3.3V.
48MHz Oscillator
8-Channel, Bi-Directional Le vel
T
ranslator. USB side has a xed 3.3V
reference. PIC side reference is the
varying VDUT reference.
Q1I
NMOS
USB-to-I2C Master
Maxim Integrated
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MAX31790 Evaluation Kit Evaluates: MAX31790
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Figure 6. MAX31790 EV Kit PCB Layout—Top
Maxim Integrated
│
17
MAX31790 Evaluation Kit Evaluates: MAX31790
www.maximintegrated.com
Figure 7. MAX31790 EV Kit PCB Layout—Bottom
Maxim Integrated
│
18
MAX31790 Evaluation Kit Evaluates: MAX31790
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Ordering Information
#Denotes an RoHS-compliant device that may include
lead(Pb), which is exempt under the RoHS requirements.
PART TYPE
MAX31790EVKIT# EV Kit
Maxim Integrated cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim Integrated product. No circuit patent licenses
are implied. Maxim Integrated reserves the right to change the circuitry and specications without notice at any time.
MAX31790 Evaluation Kit Evaluates: MAX31790
Maxim Integrated and the Maxim Integrated logo are trademarks of Maxim Integrated Products, Inc. © 2012 Maxim Integrated Products, Inc.
│
19
Revision History
REVISION
NUMBER
REVISION
DATE DESCRIPTION PAGES
CHANGED
0 1/13 Initial release —
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642, or visit Maxim Integrated’s website at www.maximintegrated.com.
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MAX31790EVKIT#