MAX5394M Evaluation Kit General Description The MAX5394M evaluation kit (EV kit) demonstrates the MAX5394M single, 256-tap volatile, low-voltage linear digital potentiometer. The device comes in an 8-pin TDFN-EP package. The EV kit provides controls to adjust the wiper and shutdown modes. The digital potentiometer is controlled by an on-board MAXQ® microcontroller that provides an SPI interface. The EV kit features Windows XP®-, Windows Vista®-, and Windows® 7-compatible software that provides a simple graphical-user interface (GUI) for exercising the device features. The EV kit comes with the MAX5394MATA+ (50kΩ end-to-end resistance) installed. Contact the factory for samples of the pin-compatible MAX5394LATA+ (10kΩ end-to-end resistance) and MAX5394NATA+ (100kΩ end-to-end resistance). Evaluates: MAX5394L—MAX5394N Features ● 1.7V to 5.5V Wide Input Supply Range ● Supports All SPI Family of Devices: 10kΩ, 50kΩ, and 100kΩ End-to-End Resistance ● On-Board Microcontroller to Generate SPI Commands ● Windows XP-, Windows Vista-, and Windows 7-Compatible Software ● USB-Powered (Cable Included) ● Fully Assembled and Tested with Proven PCB Layout Ordering Information appears at end of data sheet. Component List DESIGNATION QTY DESCRIPTION BYP, CS|ADDR0|CS/L, DIN|SDA|UD, H, L, QPEDB|ADDR1, SCLK|SCL|INC/L, W 8 B_INC/L 1 Pushbutton switch C1, C3, C23 3 0.1µF ±10%, 16V X7R ceramic capacitors (0603) TDK C1608X7R1C104K 1 100pF ±5%, 50V C0G ceramic capacitor (0603) Murata GQM1885C1H101J 15 1µF ±10%, 16V X5R ceramic capacitors (0603) Murata GRM188R61C105K 2 18pF ±5%, 50V C0G ceramic capacitors (0603) Murata GRM1885C1H180J C2 C5–C18, C24 C19, C20 QTY DESCRIPTION C21 1 1000pF ±10%, 50V X7R ceramic capacitor (0603) Murata GRM188R71H102K C25 0 Not installed, ceramic capacitor (0603) GND 1 Black test point J1 1 USB type-B right-angle PC-mount receptacle J2 0 Not installed, 10-pin (2 x 5) header J3 1 4-pin header JU1 1 3-pin header JU2 1 5-pin header JU3, JU4 2 10-pin (2 x 5) headers White test points MAXQ is a registered trademark of Maxim Integrated Products, Inc. Windows, Windows XP, and Windows Vista are registered trademarks and registered service marks of Microsoft Corporation. 19-6708; Rev 0; 5/13 DESIGNATION JU5 1 4-pin header JU6, JU7 2 2-pin headers JU_ID0–JU_ID3 0 Not installed. 2-pin headers L1 1 Ferrite bead (0603) TDK MMZ1608R301A R1–R3, R5–R9 8 4.7kΩ ±5% resistors (0603) MAX5394M Evaluation Kit Evaluates: MAX5394L—MAX5394N Component List (continued) DESIGNATION QTY R12 1 100Ω ±5% resistor (0603) DESIGNATION QTY R13 1 10kΩ ±5% resistor (0603) U8 1 3.3V LDO (5 SC70) Maxim MAX8511EXK33+ SW_A0, SW_A1, SW_UD 3 DIP switches U9 1 1.8V LDO (5 SC70) Maxim MAX8511EXK18+ TP1–TP3 0 Not installed, test points U10 0 1 50kΩ SPI digital potentiometer (8 TDFN-EP*) Maxim MAX5394MATA+ Not installed, ESD protector (6 SOT23) U1 VDD 1 Red test point Y1 1 12MHz crystal (HCM49) U2 0 Not installed, digital potentiometer (10 µMAX®) — 1 USB high-speed A-to-B cables, 6ft U3–U5 3 Level translators (10 µMAX) Maxim MAX1840EUB+ — 6 Shunts — 1 PCB: MAX5394M EVKIT 1 Microcontroller (64 LQFP) Maxim MAXQ622G-0000+ U7 DESCRIPTION DESCRIPTION *EP = Exposed pad. Component Suppliers SUPPLIER PHONE WEBSITE Murata Americas 800-241*6574 www.murataamericas.com TDK Corp. 847-803-6100 www.component.tdk.com Note: Indicate that you are using the MAX5394M when contacting these component suppliers. MAX5394M EV Kit Files FILES INSTALL.EXE MAX539XVxx.EXE USBConverterDLL.DLL UNINSTALL.EXE Procedure DESCRIPTION Installs the EV kit files on your computer Application program Application library Uninstalls the EV kit software Quick Start Required Equipment ● MAX5394M EV kit (USB cable included) ● Windows XP, Windows Vista, or Windows 7 PC with a spare USB port ● Digital voltmeter (DVM) 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 operating system. The EV kit is fully assembled and tested. Follow the steps below to verify board operation: 1) Verify that all jumpers are in their default positions, as shown in Table 1. 2)Set the DVM to measure resistance. Connect the negative terminal of the DVM to the L test point and connect the positive terminal to the W test point. 3)Visit www.maximintegrated.com/evkitsoftware to download the latest version of the EV kit software, MAX539XGUISetupVxx.ZIP. Save the EV kit software to a temporary folder and uncompress the ZIP file. 4)Install the EV kit software on your computer by running the INSTALL.EXE program inside the temporary folder. The program files are copied to your PC and icons are created in the Windows Start | Programs menu. 5) Connect the USB cable from the PC to the EV kit board; the USB driver is installed automatically. µMAX is a registered trademark of Maxim Integrated Products, Inc. www.maximintegrated.com Maxim Integrated │ 2 MAX5394M Evaluation Kit 6)Start the EV kit software by opening its icon in the Start | Programs menu. The EV kit software main window appears, as shown in Figure 1. 7) Move the wiper scrollbar up until the edit box shows 255. Evaluates: MAX5394L—MAX5394N 8) Press the H = Open, W = Unchanged button in the Standby Commands group box. 9) Verify that the DVM measures 50kΩ. Figure 1. MAX5394M EV Kit Software Main Window www.maximintegrated.com Maxim Integrated │ 3 MAX5394M Evaluation Kit Evaluates: MAX5394L—MAX5394N Detailed Description of Software The MAX5394M EV kit software provides controls to adjust the wiper and shutdown modes. supply voltage with charge pump disabled is limited to 2.6V and the terminal voltage cannot exceed -0.3V to (VDD + 0.3V). Wiper Detailed Description of Hardware The wiper register stores an 8-bit data that ranges from 0–255. There are two ways of changing the wiper register. First is by using the vertical scrollbar, and the other way is through pressing the up-down arrows to the right of the edit box. Numbers in the edit box can be in decimal or hexadecimal format by selecting the corresponding radio buttons in the Number Format group box. Standby Commands The buttons within the Standby Commands group box allows the user to change the H, W, or L terminals to open with the wiper position set to zero code, mid code, full code, or the value contained in the wiper register. The Clear Standby button is used to remove any shutdown conditions and return the wiper register to its original stored value. Refer to the MAX5394 IC data sheet for a detailed description of the standby commands. Reset Press the Reset button to return to the POR settings. This resets the wiper register to midscale (0x80), enables the charge pump, and deasserts any shutdown modes. Charge Pump Press the QP ON button in the SPI Commands group box to enable the internal charge pump that allows lowsupply voltage operation. To disable the internal charge pump, press the QP OFF button. The device’s minimum www.maximintegrated.com The MAX5394M EV kit provides a proven layout for the MAX5394M. An on-board MAXQ622 microcontroller and jumpers to disconnect the on-board microcontroller are included on the EV kit. User-Supplied Power Supply The EV kit is powered completely from the USB port by default. To power the device with a user-supplied power supply, move the shunt on jumper JU1 to the 2-3 position and apply a 1.7V to 5.5V power supply at the VDD test point and the GND test point on the EV kit. User-Supplied SPI To evaluate the EV kit with a user-supplied SPI bus, move the shunt on jumper JU2 to the 1-4 position, jumper JU3 to the 7-8 position, and jumper JU4 to the 7-8 position. Apply the user-supplied CS to the CS|ADDR0|CS/L test point, the user-supplied DIN to the DIN|SDA|UD test point, and the user-supplied SCLK to the SCLK|SCL|INC/L test point. User-Supplied H and L Remove the shunts from jumpers JU6 and JU7 and apply a user-supplied voltage at the H and L test points. The voltage range for H and L is 0 to 5.25V and is independent of the VDD operating voltage. Maxim Integrated │ 4 MAX5394M Evaluation Kit Evaluates: MAX5394L—MAX5394N Table 1. EV Kit Jumper Settings JUMPER SHUNT POSITION JU1 JU2 JU3 JU4 Connects the VDD pin of the U1 device to the on-board 1.8V supply. 1-3 Connects the VDD pin of the U1 device to a user-supplied power supply between 1.7V to 5.5V. 1-2* Connects the CS pin of the U1 device to the CS signal of the on-board microcontroller. 1-3 Do not install. 1-4 Connects the CS pin of the U1 device to a user-supplied CS signal. Apply appropriate signal to the CS|ADDR0|CS/L test point. 1-5 Do not install. 1-2* Connects the DIN pin of the U1 device to the DIN signal of the on-board microcontroller. 3-4 Do not install. 5-6 Do not install. 7-8 Connects the DIN pin of the U1 device to a user-supplied DIN signal. Apply appropriate signal to the DIN|SDA|UD test point. 9-10 Do not install. 1-2* Connects SCLK pin of the U1 device to the SCLK signal of the on-board microcontroller. 3-4 Do not install. 5-6 Do not install. 7-8 Connects the SCLK pin of the U1 device to a user-supplied SCLK signal. Apply appropriate signal to the SCLK|SCL|INC/L test point. 9-10 Do not install. Installed* JU6 Not installed Installed* JU7 DESCRIPTION 1-2* Not installed Connects the H pin to the VDD pin of the U1 device. User-supplied H. The user must apply a voltage at the H test point. The voltage range for the H pin is 0 to 5.25V. Connects the L pin of the U1 device to ground. User-supplied L. The user must apply a voltage at the L test point. The voltage range for the L pin is 0 to 5.25V. *Default position. www.maximintegrated.com Maxim Integrated │ 5 MAX5394M Evaluation Kit Evaluates: MAX5394L—MAX5394N Figure 2a. MAX5394M EV Kit Schematic (Sheet 1 of 2) www.maximintegrated.com Maxim Integrated │ 6 MAX5394M Evaluation Kit Evaluates: MAX5394L—MAX5394N Figure 2b. MAX5394M EV Kit Schematic (Sheet 2 of 2) www.maximintegrated.com Maxim Integrated │ 7 MAX5394M Evaluation Kit Evaluates: MAX5394L—MAX5394N 1.0” Figure 3. MAX5394M EV Kit Component Placement Guide—Component Side 1.0” Figure 4. MAX5394M EV Kit PCB Layout—Component Side www.maximintegrated.com Maxim Integrated │ 8 MAX5394M Evaluation Kit Evaluates: MAX5394L—MAX5394N 1.0” Figure 5. MAX5394M EV Kit PCB Layout—Inner Layer 2 1.0” Figure 6. MAX5394M EV Kit PCB Layout—Inner Layer 3 www.maximintegrated.com Maxim Integrated │ 9 MAX5394M Evaluation Kit Evaluates: MAX5394L—MAX5394N 1.0” Figure 7. MAX5394M EV Kit PCB Layout—Solder Side www.maximintegrated.com Maxim Integrated │ 10 MAX5394M Evaluation Kit Evaluates: MAX5394L—MAX5394N Ordering Information PART TYPE MAX5394MEVKIT# EV Kit #Denotes RoHS compliant. www.maximintegrated.com Maxim Integrated │ 11 MAX5394M Evaluation Kit Evaluates: MAX5394L—MAX5394N Revision History REVISION NUMBER REVISION DATE 0 5/13 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. Maxim Integrated reserves the right to change the circuitry and specifications without notice at any time. Maxim Integrated and the Maxim Integrated logo are trademarks of Maxim Integrated Products, Inc. © 2013 Maxim Integrated Products, Inc. │ 12