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| 19-2475; Rev 0; 5/02 MAX5427 Evaluation Kit General Description The MAX5427 evaluation kit (EV kit) is a fully assembled and tested surface-mount circuit board that evaluates the MAX5427 digital potentiometer. Included software generates the required signals for one-time-programmable operation and allows easy control of the wiper position. An on-board 8-pin MAX socket eases replacement of the device. The EV kit is designed to be connected to a standard IBM-compatible PC-parallel (printer) port. Windows(R) 95/98/2000-compatible software provides a user-friendly interface to exercise the MAX5427's features. The program is menu driven and offers a graphic user interface with control buttons. (Note: Windows 2000 requires the installation of a driver; refer to Win2000.pdf or Win2000.txt located on the diskette for information.) This EV kit can also be used to evaluate the MAX5428 and MAX5429 digital potentiometers. Windows is a registered trademark of Microsoft Corp. Features o On-Board 8-Pin MAX Socket o Windows 95/98/2000 Evaluation Software o Software Adjusts and Programs Wiper Position o Fully Assembled and Tested Evaluates: MAX5427/MAX5428/MAX5429 Ordering Information PART MAX5427EVKIT TEMP RANGE 0C to +70C IC PACKAGE 8 MAX Note: To evaluate the MAX5428 or the MAX5429, request a free sample of MAX5428EUA or MAX5429EUA with the MAX5427EVKIT. Component List DESIGNATION C1 QTY 1 DESCRIPTION 4.7F 20%, X5R 6.3V ceramic capacitor (0805) TDK C2012X5R0J475M 22F 20%, X5R 16V ceramic capacitor (1812) TDK C4532X7R1C226M Green surface-mount LED Dual Shottky diode (SOT23) Diodes INC BAT54C or Fairchild BAT54C or General Semiconductor or BAT54C DB-25 right-angle plug (male) 1.6k 5% resistor (1206) 8-pin MAX socket Wells-CTI 656-1082211 U3 None None None None 1 1 1 1 1 DESIGNATION QTY DESCRIPTION Digital potentiometer (8-pin MAX) MAX5427EUA Low-voltage, analog switch (6pin SOT23) MAX4544EUT Low-voltage level translator (10-pin MAX) MAX1840EUB MAX5427 PC board 3 1/2in software disk MAX5427 evaluation kit MAX5427 data sheet MAX5427 EV kit data sheet U1 1 C2 D1 1 1 U2 1 D2 1 J1 R1 U1 1 1 1 ________________________________________________________________ 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. MAX5427 Evaluation Kit Evaluates: MAX5427/MAX5428/MAX5429 Component Suppliers SUPPLIER Diodes Inc. Fairchild Semiconductor General Semiconductor TDK Wells-CTI PHONE 805-446-4800 888-522-5372 760-804-9258 847-803-6100 623-581-5330 FAX 805-446-4850 N/A 760-804-9259 847-390-4405 623-780-3987 WEBSITE www.diodes.com www.fairchildsemi.com www.gensemi.com www.component.tdk.com www.wellscti.com Note: Please indicate that you are using the MAX5427 when contacting these component suppliers. Quick Start Recommended Equipment * * * * * One variable DC power supply capable of supplying between 2.7V and 5.5V at 100mA One fixed DC power supply capable of supplying 11V at 20mA One ohmmeter A parallel printer port (this is a 25-pin socket on the back of the computer) A computer running Windows 95, 98, or 2000. (Note: Windows 2000 requires the installation of a driver; refer to Win2000.pdf or Win2000.txt located on the diskette for information.) A standard 25-pin, straight-through, male-to-female cable (printer extension cable) to connect the computer's parallel port to the MAX5427EVKIT 7) Connect the positive terminal of the fixed 11V power supply to the pad labeled VPP. 8) Connect the ground return of the fixed 11V power supply to the corresponding pad labeled GND. 9) Connect the positive terminal of the ohmmeter to the pad marked H. 10) Connect the ground return of the ohmmeter to the pad marked W. 11) Install the software by running the INSTALL.EXE program. The install program copies the files and creates icons for them in the Windows 95/98/2000 Start menu. 12) Turn on the 5V variable power supply. 13) Turn on the 11V fixed power supply. 14) Start the MAX5427 program by opening its icon in the Start menu. 15) Wait until the program automatically detects the MAX5427 and displays the main window (Figure 1). The MAX5427 is now in its default power-on-reset (POR) mode (wiper is at midscale for an unprogrammed device). * Procedure The MAX5427 EV kit is fully assembled and tested. Follow the steps below to verify board operation. Do not turn on the power supply until all connections are completed: 1) Connect a cable from the computer's parallel port to the MAX5427EVKIT. To avoid damaging the EV kit or your computer, do not use a 25-pin SCSI port or any other connector that is physically similar to the 25-pin parallel printer port. The parallel port is typically labeled LPT or PRINTER. 2) Adjust the variable power supply to 5V. 3) Ensure that the variable power supply is turned off. 4) Ensure that the fixed 11V power supply is turned off. 5) Connect the positive terminal of the variable power supply to the pad labeled VDD. 6) Connect the ground return of the variable power supply to the corresponding pad labeled GND. 2 Detailed Description of Software Use the mouse or press the Tab key to navigate with the arrow keys. Each of the buttons corresponds to commands used to set the wiper position or program the device. Note: Words in boldface indicate user-selectable features in the software. Wiper Control The wiper position is adjusted sequentially through the tap positions using a simple 2-wire interface. To increment the wiper position, press the Up button. To decrement the wiper position, press the Down button. _______________________________________________________________________________________ MAX5427 Evaluation Kit Program Control To set the power-on position of the wiper, press the Program button. Checking the Disable Interface checkbox disables the 2-wire interface, preventing further unwanted adjustment. Refer to the One-Time Programming section of the MAX5427/MAX5428/ MAX5429 data sheet for more details. 3) Check the Disable Parallel Port checkbox. 4) Disconnect any power supply connected to the H, W, and L pads. 5) Turn on the power supply connected to VDD. 6) Turn on the power supply connected to VPP. 7) Uncheck the Disable Parallel Port checkbox. Evaluates: MAX5427/MAX5428/MAX5429 Resetting the MAX5427 The Disable Parallel Port checkbox is used to reset the digital potentiometer at power-up. Checking this box forces all of the parallel port lines to a logic low (0V), ensuring that the device is not powered through the interface. To reset the device, do the following: 1) Turn off the power supply connected to VPP. 2) Turn off the power supply connected to VDD. Detailed Description of Hardware The MAX5427 EV kit is a complete programming platform for the MAX5427 digital potentiometer. Parallel port signals are level translated through a MAX1840 to ensure reliable operation. The EV kit also includes an 8-pin MAX socket to ease the programming of multiple devices. NOTE: THE MAIN WINDOW OF THE MAX5427 EV KIT SOFTWARE ALLOWS THE USER TO EASILY ADJUST AND PROGRAM THE MAX5427. Figure 1. MAX5427 EV Kit Software Main Window _______________________________________________________________________________________ 3 MAX5427 Evaluation Kit Evaluates: MAX5427/MAX5428/MAX5429 J1-10 J1-4 J1-11 J1-12 J1-15 J1-7 J1-18 J1-6 L D2 1 DATA I/O 10 VDD IN VCC 2 R U3 MAX1840 DVCC CLK 9 C1 4.7F 8 2 CS VDD 3 VDD J1-19 J1-20 J1-21 J1-22 J1-23 J1-24 J1-25 J1-2 J1-3 J1-5 J1-13 J1-8 J1-1 J1-9 J1-14 N.C. N.C. N.C. N.C. 3 4 CIN RIN RST 7 6 U/D U1 MAX5427 H 8 H 5 VPP W 1 W 4 5 SHDN GND 6 GND L 7 L D1 R1 1.6k GND J1-17 J1-16 N.C. N.C. IN 1 IN U2 COM 5 CONNECTOR DB-25 VPP VDD C2 22F 2 V+ MAX4544 NC 4 6 NO GND 3 VDD GND NOTE: U1 IS A SOCKETED 8-PIN MAX. WELLS-CTI PART NO. 656-1082211. Figure 2. MAX5427 EV Kit Schematic 4 _______________________________________________________________________________________ MAX5427 Evaluation Kit Evaluates: MAX5427/MAX5428/MAX5429 1.0" 1.0" Figure 3. MAX5427 EV Kit Component Placement Guide-- Component Side Figure 4. MAX5427 EV Kit PC Board Layout--Component Side 1.0" Figure 5. MAX5427 EV Kit PC Board 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 _____________________ 5 (c) 2002 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products. |
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