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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-I

C interface.

The USB-to-I

C 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-I

C 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.

Summary of content (19 pages)

PAGE 1
MAX31790 Evaluation Kit General Description The MAX31790 evaluation kit (EV kit) provides the hardware and software graphical user interface (GUI) necessary 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.
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MAX31790 Evaluation Kit Evaluates: MAX31790 Component List DESIGNATION QTY B1 1 Green banana jack Deltron 571-0500 B2 1 Black banana jack Deltron 571-0100 1 Yellow banana jack Deltron 571-0700 1 0.1µF ±10%,100V X7R ceramic capacitor (0805) TDK CGA4J2X7R2A104K 5 0.1µF ±10%, 25V X7R ceramic capacitors (0603) TDK C1608X7R1E104K 2 4.7µF ±10%, 6.3V X5R ceramic capacitors (0603) TDK C1608X5R0J475K B3 C1 C1I, C6I, C7I, C11I, C13I C2I, C5I DESCRIPTION C3 1 4.
PAGE 3
MAX31790 Evaluation Kit Evaluates: MAX31790 Component List (continued) DESIGNATION QTY DESCRIPTION DESIGNATION QTY DESCRIPTION U1 1 Fan controller (28 TQFN-EP*) Maxim MAX31790ATI+ U1I 1 Current-limit switch (5 SOT70) Maxim MAX4787EXK+ R7–R10, R100, R200, R300, R400, R500, R600 10 R9I 1 2.2kΩ ±1% resistor (0603) Vishay CRCW06032K20FKEA U2I 1 Linear regulator (5 SOT23) Maxim MAX8868EUK33+ R10I 1 4.
PAGE 4
MAX31790 Evaluation Kit 4) Ensure that jumpers/shunts J101, J201, J301, J401, J501, and J601 are installed, which connects the associated 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 hardware to a PC using the supplied mini-USB cable, or equivalent. The COM LED (D2l) should be red and slowly flash orange.
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MAX31790 Evaluation Kit Evaluates: MAX31790 Figure 1. MAX31790 EV Kit GUI (Main Tab) www.maximintegrated.
PAGE 6
MAX31790 Evaluation Kit Evaluates: MAX31790 Figure 2. MAX31790 EV Kit GUI (FanChannel1 Tab) www.maximintegrated.
PAGE 7
MAX31790 Evaluation Kit Evaluates: MAX31790 Figure 3. MAX31790 EV Kit GUI (Fan Faults Tab) www.maximintegrated.
PAGE 8
MAX31790 Evaluation Kit Reads Each register of the device can be read from the GUI by the simple press of the associated Read button.
PAGE 9
MAX31790 Evaluation Kit 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 automatically writes the selected value to the device. To verify a successful write, perform a read that then updates the field.
PAGE 10
MAX31790 Evaluation Kit Evaluates: MAX31790 Table 1. Hardware Configurations 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.
PAGE 11
MAX31790 Evaluation Kit Evaluates: MAX31790 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 GUI indicates: Hardware not found GUI Status indicates: Error communicating with the MAX31790 www.maximintegrated.com CHECK SOLUTION Is the LED labeled D1l red? If yes, then the electronic fuse is in a fault state.
PAGE 12
GND GND VCC VCC J4 WD_START WD_STRT: GND = NO WATCHDOG VCC = 30s WD_START J3 SPIN_START FRQ_STRT: GND = 30Hz UNCONNECTED = 1.47 kHz VCC = 25kHz SPIN_STRT: GND = NO SPIN-UP UNCONNECTED = 0.5s MAX VCC = 1.
PAGE 13
TP 40 VF AN C100 DNP GND GND TP 47 GND D3 D1 TACH3 R302 DNP TP 46 VF AN PWMOUT3 PWMOUT3 TACH3 GND TP 41 GND PWMOUT1 PWMOUT1 TACH1 TACH1 R102 DNP GND DNP (5.5V ZE NE R ) DNP (5.5V ZE NE R ) C300 DNP R101 4.7k J101 PWM1 GND J301 C301 DNP R301 4.7k VCC 200 MIL TRACE C101 DNP R303 4.7k VCC 0 R300 GND R103 4.
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TP 49 VF AN TP 55 PWMOUT6 PWMOUT6 TP 56GND TACH6 TACH6 R602 DNP GND GND D6 C600 DNP C400 DNP D4 GND VF AN PWMOUT4 PWMOUT4 TP 50GND TACH4 TACH4 R402 DNP GND DNP (5.5V ZE NE R ) DNP (5.5V ZE NE R ) J401 R401 4.7k PWM4 GND J601 C601 DNP R601 4.7k VCC 200 MIL TRACE C401 DNP R603 4.7k VCC 0 R600 GND R403 4.
PAGE 15
GND J4I 2 1 GND 4.7k R10I VP I 3V3 VMI 3V3 VMO 3V3 OE 3V3 J2I VCC D2I A R7I 330 VCC COM VP P D3I C14I OE VDUT CL K VDUT GND 1 2 3 4 5 6 7 8 9 10 11 12 13 14 1.0uF 1.0uF PICfor DS3900 0.1uF C11I P8,1W_P U P7,1W_DQ P5 USB_DET VP O VMO P10,SCK ,SCL P11,SDI ,SDA VDD GND P9,SDO ENUM D+,VP D-,VM GND C9I C10I 5V 3.3V GND J1I VBUS 1 Vbus 2 R2I 24.9 DD3 R3I 24.9 D+ D+ 4 I.D.
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MAX31790 Evaluation Kit Evaluates: MAX31790 Figure 6. MAX31790 EV Kit PCB Layout—Top www.maximintegrated.
PAGE 17
MAX31790 Evaluation Kit Evaluates: MAX31790 Figure 7. MAX31790 EV Kit PCB Layout—Bottom www.maximintegrated.
PAGE 18
MAX31790 Evaluation Kit Evaluates: MAX31790 Ordering Information PART TYPE MAX31790EVKIT# EV Kit #Denotes an RoHS-compliant device that may include lead(Pb), which is exempt under the RoHS requirements. www.maximintegrated.
PAGE 19
MAX31790 Evaluation Kit Evaluates: MAX31790 Revision History REVISION NUMBER REVISION DATE 0 1/13 DESCRIPTION Initial release PAGES CHANGED — 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. 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.