evaluates: ds4422/ds4424 ds4424 evaluation kit general description the ds4422 and ds4424 contain two or four i 2 c- programmable current dacs that are each capable of sinking and sourcing current up to 200a. the ds4424 evaluation kit (ev kit) provides the hardware and software graphical user interface (gui) necessary to evaluate the ds4424 4-channel, 7-bit sink/source current dac. the ds4422 has the same performance as the ds4424, except with only two channels. the ev kit includes a ds4424 installed, as well as two pop - ulated full-scale calibration resistors (r3 and r4) and two unpopulated resistors (r5 and r6). this allows the device to be evaluated without any board rework on two channels but enables a custom-defined value to be populated on the two open channels. the ev kit also has the usb-to-i 2 c interface required to communicate to the device. features easy evaluation of the ds4424 ev kit hardware is usb powered usb hid interface windows xp?- and windows? 7-compatible software rohs compliant proven pcb layout fully assembled and tested ev kit contents assembled circuit board including ds4424 19-6921; rev 0; 2/14 ordering information appears at end of data sheet. windows and windows xp are registered trademarks and registered service marks of microsoft corporation. ds4424 ev kit photo downloaded from: http:///
maxim integrated 2 www.maximintegrated.com evaluates: ds4422/ds4424 ds4424 evaluation kit quick start required equipment ds4424 ev kit hardware windows xp or windows 7 pc usb port micro-usb cable note: in the following sections, software-related items are identified by bolding . text in bold refers to items directly from the install or ev kit software. text in bold and under - lined 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) place the ev kit hardware on a nonconductive surface to ensure that nothing on the pcb gets shorted together. 2) prior to starting the gui, connect the ev kit hardware to a pc using the mini-usb cable, or equivalent. the power led (d20) should be green and the com led (d21) should be red and slowly flash orange. 3) windows should automatically begin installing the necessary device driver. the usb interface of the ev kit hardware is configured as an hid device and there - fore 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. 4) once the device driver installation is complete, visit www.maximintegrated.com/evkitsoftware to download the latest version of the ev kit software, DS4424EVKITsoftwareinstall.zip. save the ev kit software to a temporary folder. 5) open the .zip file and double-click the .exe file to run the installer. a message box stating the publisher could not be verified. are you sure you want to run this software? may appear. if so, click yes . 6) the installer gui appears. click next and then install . once complete, click close . 7) go to start | all programs . look for the ds44240evkitsoftware folder and click on the DS4424EVKITsoftware.exe inside the folder. 8) when the gui appears, the text in the bottom right-hand corner should display ev kit hardware connected . the com led (d21) on the ev kit board should turn green. note: the .exe file is downloaded as a .zip file. file description DS4424EVKITsoftwareinstall.exe application program ds4424 ev kit files downloaded from: http:///
maxim integrated 3 www.maximintegrated.com evaluates: ds4422/ds4424 ds4424 evaluation kit software startup if the ds4424 ev kit is connected when the software is opened, the software first initializes the hardware to communicate. the software then searches for all slave addresses on the i 2 c bus and connects to the first valid slave address. the gui displays ev kit hardware connected in the bottom right-hand corner. if the ev kit is not connected on software startup, then the gui populates with default ev kit values. once the ev kit is connected, the gui executes the sequence above. menu and status barthe file menu item contains an exit option. to exit, select exit . the device menu item allows the user to connect to a desired device. find slave addresses searches for all slave addresses connected to the i 2 c bus. to select a device, click select slave address and all the slave addresses found are shown and are selectable. status log the status log located at the bottom left-hand side of the gui displays all the actions the gui performs. whenever an i 2 c command is read or written, the action is confirmed by the log. the log can be cleared by clicking on the clear button. status tab the status tab, located on the bottom of the gui, displays the current status, ev kit software version, and whether or not the hardware is connected. communicating with the device in order to read and write from the selected slave address, there are two buttons labeled read and write . clicking the read button updates the four register values displayed on the gui. all values are represented in a hexadecimal format. to send data, type or use the up/ down arrows to adjust the registers to the appropriate values. then click the write button. figure 1. ds4424 ev kit gui detailed description of software downloaded from: http:///
maxim integrated 4 www.maximintegrated.com evaluates: ds4422/ds4424 ds4424 evaluation kit detailed description of hardware changing the slave address the slave address for the ds4424 can be changed by changing the configuration of the jumpers on hdr1. use two jumpers to connect the a0 and a1 nodes to either v cc or gnd. the resulting address is shown in table 1 . troubleshooting all efforts have been made to ensure that each 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 trouble - shoot the issue. slave address a1 a0 20h gnd gnd 60h gnd v cc a0h v cc gnd e0h v cc v cc led color description d20 (power) red usb power fault: a fault occurred due to overvoltage limit, current limit, or thermal limit. green usb power: usb power supply is on. d21 (com) red communication: after the software has initialized the hardware, the led lashes red when an i 2 c command is received. green initialized: hardware has been initialized by software. symptom check solution gui says hardware not found is the led labeled d20 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 d21 turn green when the gui is running? if not, then exit the gui and try running it again. if d20 still does not turn green, then exit the gui and try connecting the usb cable to a different usb port on the pc and wait for a windows message that states the hardware is ready to use. run the gui again. are any of the leds illuminated? if not, then the pcb may not be getting power from the usb. try a different usb cable or a different usb port. table 1. slave addresses table 2. description of leds table 3. troubleshooting downloaded from: http:///
maxim integrated 5 www.maximintegrated.com evaluates: ds4422/ds4424 ds4424 evaluation kit * ep = exposed pad. designation qty description c1, c212 2 0.1f 10%, 100v ceramic capacitors (0805) tdk cga4j2x7r2a104k c201, c202, c204 3 10f 10%, 16v ceramic capacitors (0805) taiyo yuden emk212abj106kd-t c203, c214 2 0.01f 10%, 100v ceramic capacitors (0805) murata grm21br72a103k c211 1 1.0f 10%, 50v ceramic capacitor (0805) tdk c2012x7r1h105k/soft c213 1 0.22f 10%, 50v ceramic capacitor (0805) tdk c2012x7r1h224k c215 1 do not populate, ceramic capacitor d20, d21 2 dual red/green leds (0805)knightbright aphbm2012surkcgkc d22 1 30v, 3a schottky diode (mini2) panasonic ssg db2w31900l hdr1 1 6-pin, dual-row header3m 961206-6404-ar j20 1 usb micro-b recepticalmolex 105017-0001 j21 1 2-pin, single-row header 3m 961102-6404-ar r1, r2, r210 3 4.7k? 1% resistors (0805) r3 1 38.3k? 1% resistor (0805) r4 1 154k? 1% resistor (0805) r5, r6 0 not populated, to allow user to select the full-scale calibration current for these outputs designation qty description r201, r202, r214 3 0? 1% resistors (0805) r203, r205 2 560? 1% resistors (0805) r204 1 100k? 1% resistor (0805) r206 1 45.3k? 1% resistor (0805) r207 1 10k? 1% resistor (0805) r211, r212 2 330? 1% resistors (0805) r213 1 2.2k? 1% resistor (0805) ref1 0 do not populate tp1, tp9, tp10 3 red test pointskeystone 5010 tp2 1 black test point keystone 5011 tp3Ctp8 6 white test pointskeystone 5012 u1 1 2-/4-channel, i 2 c, 7-bit sink/ source current dac (10 tdfn-ep*) maxim ds4424n+ u20 1 microcontroller (28 so)microchip pic18lf2550-i/so u21 1 50ma to 600ma programmable current-limit switch (6 sot23) maxim max4995aaut+ u22 1 500ma low-noise ldo regulator 8 tdfn-ep*) maxim max8902bata+ x1 1 48mhz, 3.3v oscillator, 3.2mm x 2.5mm smd avx kc3225a48.0000c30e00 component list downloaded from: http:///
maxim integrated 6 www.maximintegrated.com evaluates: ds4422/ds4424 ds4424 evaluation kit figure 2a. ds4244 ev kit schematic (sheet 1 of 2) sda 1 scl 2 gnd 3 fs3 4 fs2 5 fs1 6 fs0 7 out0 8 a0 9 out1 10 a1 11 out2 12 vcc 13 out3 14 u1ds4424 c1 0.1uf r24.7 k r14.7 k r3varies r4varies r5dnp r6dnp tp3sda tp2gnd tp13.3 v tp4 scl tp5out0 tp6out1 tp7out2 tp8out3 1 1 2 2 3 3 4 4 5 5 6 6 hdr1hdr_6p i n gnd gnd gnd 3.3 v 3.3 v 3.3v sd a sc l out 0 out 1 out 2 out 3 a0 a1 downloaded from: http:///
maxim integrated 7 www.maximintegrated.com evaluates: ds4422/ds4424 ds4424 evaluation kit figure 2b. ds4244 ev kit schematic (sheet 2 of 2) d- d+ vbus 5v 3.3 v 3.3 v 3.3 v d+ d- scl sda vpp osc1 hbcom 3.3 v cl k 3.3 v gnd gnd gnd gnd gnd tp9 5v tp10 3.3 v r202 0 r203560 r204100 k r205560 r20645.3 k r20710 k r201 0 c20110uf c20210uf c20410uf red d20a green d20b out 1 gnd 2 set i 3 on 4 in 5 fl ag 6 u21max4995a in 1 gnd 2 en 3 gs 4 pok 5 fb 6 byp 7 out 8 u22max8902b c215dnp r2104.7 k r211330 r212330 r2132.2 k r2140 c2140.01uf c2130.22uf c2111.0u f c2120.1u f r ed d21a green d21b 1 2 d22 1 2 j21dnp inh 1 gnd 2 out 3 vcc 4 x148mhz mc l 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- ,v m 15 d+,v p 16 enum 17 p9,sdo 18 gnd 19 vdd 20 p11,sd i ,sd a 21 p10,sck,scl 22 vmo 23 vpo 24 usb_det 25 p5 26 p7,1w_dq 27 p8,1w_pu 28 u20ds3900_p i c vbus 1 d- 2 d+ 3 i .d . 4 gnd 5 j20usb_5p i n c2030.01uf downloaded from: http:///
maxim integrated 8 www.maximintegrated.com evaluates: ds4422/ds4424 ds4424 evaluation kit figure 3. ds4244 ev kit pcb layouttop figure 4. ds4244 ev kit pcb layoutbottom downloaded from: http:///
maxim integrated 9 www.maximintegrated.com evaluates: ds4422/ds4424 ds4424 evaluation kit # denotes an rohs-compliant device that may include lead(pb) that is exempt under the rohs requirements. part type DS4424EVKIT# ev kit ordering information downloaded from: http:///
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 speciications without n otice at any time. maxim integrated and the maxim integrated logo are trademarks of maxim integrated products, inc. ? 2014 maxim integrated products, inc. 10 evaluates: ds4422/ds4424 ds4424 evaluation kit revision number revision date description pages changed 0 2/14 initial release revision history for pricing, delivery, and ordering information, please contact maxim direct at 1-888-629-4642, or visit maxim integrateds website at www.maximintegrated.com. downloaded from: http:///
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