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general description the max5394m evaluation kit (ev kit) demonstrates the max5394m single, 256-tap volatile, low-voltage lin - ear 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+ (50k end-to-end resistance) installed. contact the factory for samples of the pin-compatible max5394lata+ (10k end-to-end resistance) and max5394nata+ (100k end-to-end resistance). features 1.7v to 5.5v wide input supply range supports all spi family of devices: 10k, 50k, and 100k 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 19-6708; rev 0; 5/13 ordering information appears at end of data sheet. maxq is a registered trademark of maxim integrated products, inc. windows, windows xp, and windows vista are registered trade - marks and registered service marks of microsoft corporation. designation qty description byp, cs |addr0|cs/l, din|sda|ud, h, l, qpedb|addr1, sclk|scl|inc/l, w 8 white test points b_inc/l 1 pushbutton switch c1, c3, c23 3 0.1f 10%, 16v x7r ceramic capacitors (0603) tdk c1608x7r1c104k c2 1 100pf 5%, 50v c0g ceramic capacitor (0603) murata gqm1885c1h101j c5Cc18, c24 15 1f 10%, 16v x5r ceramic capacitors (0603) murata grm188r61c105k c19, c20 2 18pf 5%, 50v c0g ceramic capacitors (0603) murata grm1885c1h180j designation 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 ju5 1 4-pin header ju6, ju7 2 2-pin headers ju_id0Cju_id3 0 not installed. 2-pin headers l1 1 ferrite bead (0603) tdk mmz1608r301a r1Cr3, r5Cr9 8 4.7k? 5% resistors (0603) component list max5394m evaluation kit evaluates: max5394lmax5394n
maxim integrated 2 max is a registered trademark of maxim integrated products, inc. 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. procedure 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 run - ning 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. note: indicate that you are using the max5394m when contacting these component suppliers. * ep = exposed pad. supplier phone website murata americas 800-241*6574 www.murataamericas.com tdk corp. 847-803-6100 www.component.tdk.com designation qty description r12 1 100? 5% resistor (0603) r13 1 10k? 5% resistor (0603) sw_a0, sw_a1, sw_ud 3 dip switches tp1Ctp3 0 not installed, test points u1 1 50k? spi digital potentiometer (8 tdfn-ep*) maxim max5394mata+ u2 0 not installed, digital potentiometer (10 max ? ) u3Cu5 3 level translators (10 max) maxim max1840eub+ u7 1 microcontroller (64 lqfp) maxim maxq622g-0000+ designation qty description u8 1 3.3v ldo (5 sc70) maxim max8511exk33+ u9 1 1.8v ldo (5 sc70) maxim max8511exk18+ u10 0 not installed, esd protector (6 sot23) vdd 1 red test point y1 1 12mhz crystal (hcm49) 1 usb high-speed a-to-b cables, 6ft 6 shunts 1 pcb: max5394m evkit files description install.exe installs the ev kit fles on your computer max539xvxx.exe application program usbconverterdll.dll application library uninstall.exe uninstalls the ev kit software component list (continued) component suppliers max5394m ev kit files max5394m evaluation kit evaluates: max5394lmax5394n www.maximintegrated.com
maxim integrated 3 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 . 8) press the h = open, w = unchanged button in the standby commands group box. 9) verify that the dvm measures 50k. figure 1. max5394m ev kit software main window max5394m evaluation kit evaluates: max5394lmax5394n www.maximintegrated.com
maxim integrated 4 detailed description of software the max5394m ev kit software provides controls to adjust the wiper and shutdown modes. wiper the wiper register stores an 8-bit data that ranges from 0C255. 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 low- supply voltage operation. to disable the internal charge pump, press the qp off button. the devices minimum supply voltage with charge pump disabled is limited to 2.6v and the terminal voltage cannot exceed -0.3v to (v dd + 0.3v). detailed description of hardware 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 v dd operating voltage. max5394m evaluation kit evaluates: max5394lmax5394n www.maximintegrated.com
maxim integrated 5 table 1. ev kit jumper settings *default position. jumper shunt position description ju1 1-2* connects the v dd pin of the u1 device to the on-board 1.8v supply. 1-3 connects the v dd pin of the u1 device to a user-supplied power supply between 1.7v to 5.5v. ju2 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. ju3 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. ju4 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. ju6 installed* connects the h pin to the v dd pin of the u1 device. not installed 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. ju7 installed* connects the l pin of the u1 device to ground. not installed 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. max5394m evaluation kit evaluates: max5394lmax5394n www.maximintegrated.com
maxim integrated 6 figure 2a. max5394m ev kit schematic (sheet 1 of 2) max5394m evaluation kit evaluates: max5394lmax5394n www.maximintegrated.com
maxim integrated 7 figure 2b. max5394m ev kit schematic (sheet 2 of 2) max5394m evaluation kit evaluates: max5394lmax5394n www.maximintegrated.com
maxim integrated 8 figure 3. max5394m ev kit component placement guidecomponent side figure 4. max5394m ev kit pcb layoutcomponent side 1.0? 1.0? max5394m evaluation kit evaluates: max5394lmax5394n www.maximintegrated.com
maxim integrated 9 figure 5. max5394m ev kit pcb layoutinner layer 2 figure 6. max5394m ev kit pcb layoutinner layer 3 1.0? 1.0? max5394m evaluation kit evaluates: max5394lmax5394n www.maximintegrated.com
maxim integrated 10 figure 7. max5394m ev kit pcb layoutsolder side 1.0? max5394m evaluation kit evaluates: max5394lmax5394n www.maximintegrated.com
maxim integrated 11 # denotes rohs compliant. part type MAX5394MEVKIT# ev kit ordering information max5394m evaluation kit evaluates: max5394lmax5394n www.maximintegrated.com
? 2013 maxim integrated products, inc. 12 revision number revision date description pages changed 0 5/13 initial release revision history 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 specifcations without notice at any time. max5394m evaluation kit evaluates: max5394lmax5394n maxim integrated and the maxim integrated logo are trademarks of maxim integrated products, inc. for pricing, delivery, and ordering information, please contact maxim direct at 1-888-629-4642, or visit maxim integrateds website at www.maximintegrated.com.

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