general description the max6946 evaluation (ev) kit is an assembled andtested pcb that demonstrates the capabilities of the max6946 constant-current led driver and digital i/o expander. the ev kit includes three rgb leds and one white led that can be controlled simultaneously by the max6946. the max6947 can also be evaluated on the ev kit board by replacing the max6946 ic. the max6946 evaluation system (ev system) includes a max6946 ev kit and a maxim interface board (cmaxqusb). the cmaxqusb board connects to a pc? usb port and allows the transfer of i 2 c commands to the max6946 ev kit. the cmaxqusb board allows a pc to use its usb port to emulate an i 2 c 2-wire interface. windows 98se/2000/xp-compatible software (which can bedownloaded from www.maxim-ic.com/evkitsoftware) pro- vides a user-friendly interface to exercise the fea- tures of the max6946. the program is menu driven and offers a graphical user interface (gui) with control buttons and a status display. order the MAX6946EVCMAXQU+ for a complete pc-based evaluation kit of the max6946. order the max6946evkit+ if you already have a cmaxqusb interface board or an i 2 c-compatible 2-wire interface system. features ? proven pcb layout ? windows 98se/2000/xp-compatible evaluation software ? three rgb leds and one white led ? access to i 2 c interface signals ? header for accessing to the max6946 10 i/o ports ? fully assembled and tested evaluate: max6946/max6947 max6946 evaluation kit/evaluation system ___________________________________________________ _____________ maxim integrated products 1 19-0752; rev 0; 2/07 for pricing, delivery, and ordering information, please contact maxim/dallas direct! at 1-888-629-4642, or visit maxim? website at www.maxim-ic.com. ordering information part t em p r a n g e* ic package 2 - w ir e ser ia l i n t er f a c e t ype max6946evkit+ 0? to +70? 16 tqfn-ep user- supplied i 2 c interface m a x6 9 4 6 evc m a xq u + 0? to +70? 16 tqfn-ep cmaxqusb interface board component list part qty description max6946evkit+ 1 max6946 ev kit cmaxqusb+ 1 maxim interface board windows is a registered trademark of microsoft corp. + denotes a lead-free and rohs-compliant ev kit/system. * pcb temperature rating only. MAX6946EVCMAXQU ev system designation qty description c1 1 0.1? ?0%, 6.3v x5r ceramiccapacitor (0402) tdk c1005x5r0j104k c2 0 not installed, ceramic capacitor(0603) c3 1 10? ?0%, 10v x5r ceramiccapacitor (0805) tdk c2012x5r1a106k max6946 evaluation kit designation qty description c4 0 not installed, ceramic capacitor(0805) d1, d2, d3 3 rgb leds (2.4mm x 3.2mm)optek ovsargb3r8 d4 1 white led (plcc-2)optek ovs9wbcr9 j1 1 2 x 10 right-angle female receptacle j2 1 2 x 10-pin header ju1 1 2-pin header ju2 0 not installed, 3-pin header r1 1 4.7k ?% resistor (0402) r2?11 0 not installed, resistors (0402) r12, r13 0 not installed, resistors (0603) max6946 evaluation kit component suppliers supplier phone website optek 972-323-2200 www.optekinc.com tdk 847-803-6100 www.component.tdk.com note: indicate you are using the max6946/max6947 when contacting these manufacturers. downloaded from: http:///
evaluate: max6946/max6947 max6946 evaluation kit/evaluation system 2 __________________________________________________ _____________________________________ quick start recommended equipment the maxim MAX6946EVCMAXQU evaluation system: max6946 ev kitmaxim interface board (cmaxqusb) usb cable (included with cmaxqusb) one 5.5v to 7.0v, 300ma power supply one user-supplied windows 98se/2000/xp pc with an unused usb port note: in the following section(s), software-related items are identified by bolding. text in bold refers to items directly from the ev kit software. text in bold and underline refers to items from the windows 98se/2000/xp operating system. procedure the max6946 ev kit is a fully assembled and testedsurface-mount board. follow the steps below to verify board operation. do not enable the power supply until all connections are made. 1) visit the maxim integrated products website (www.maxim-ic.com/evkitsoftware) to download the most current version of the ev kit softwaremax6946rxx.zip. save the ev kit software to a tem- porary folder and uncompress the zip file. 2) install the max6946 ev kit software on your pc by running the install.exe program. the programfiles are copied and icons are created for them in the windows start | programs menu. 3) place a shunt on the 3.3v setting of jumper ju1 on the cmaxqusb interface board. 4) verify that the two switches on sw1, located on the cmaxqusb board, are set to the on position. 5) verify that a shunt is installed across jumper ju1 on the ev kit board. 6) connect the max6946 ev kit? 20-pin female con- nector (j1) to the cmaxqusb? 20-pin male con-nector (p3). 7) connect the 5.5v power supply between the max6946 ev kit? vled and gnd pads. 8) enable the power supply. 9) connect the usb cable from the pc to the cmaxqusb board. a building driver database window should pop up in addition to a new hardware found message if this is the first time the ev kit board is connected to the pc. if you do notsee a window that is similar to the one described above after 30 seconds, try removing the usb cable from the cmaxqusb and reconnect it. administrator privileges are required to install the usb device driver on windows 2000 and xp. refer to the document troubleshooting_usb.pdf included with the software if you have any problems during this step. 10) follow the directions of the add new hardware wizard to install the usb device driver. choose the search for the best driver for your device option. specify the location of the device driver to be c:\program files\max6946 (default installation directory) using the browse button. 11) start the max6946 ev kit software by opening its icon in the start | programs menu. the application win- dow shown in figure 1 appears, and the softwareconnects to the cmaxqusb after a few seconds. 12) select the run enable: drop box located in the global settings group box and select run mode . 13) select the constant-current sink radio button in the p0-p9 configuration group box to illuminate all of the leds on the ev kit. designation qty description sw1 1 momentary pushbutton switch u1 1 maxim: max6946ate+ (16-pintqfn 3mm x 3mm) top mark: aes see jumper table for jumper settings 11 shunts (j2, ju1) 1 pc board: max6946 evaluation kit max6946 evaluation kit file description install.exe installs the ev kit files onyour computer max6946.exe executes the applicationprogram uninst.ini uninstalls the ev kitsoftware ftd2xx.inf usb device driver file troubleshooting_usb.pdf usb troubleshooting guide max6946evkit files component list (continued) downloaded from: http:///
detailed description of hardware max6946 ev system the max6946 ev system (MAX6946EVCMAXQU) is acomplete 10-port, constant-current led driver and i/o expander system, consisting of a max6946 ev kit and the maxim interface board (cmaxqusb). cmaxqusb the cmaxqusb is a maxim interface board that pro-vides an i 2 c interface bus to demonstrate various maxim devices. maxim reserves the right to change theimplementation of this module at any time with no advance notice. max6946 ev kit the max6946 ev kit board provides a proven layout forevaluating the max6946 constant-current led dri- ver/10-port i/o expander ic and can be obtained sepa- rately without the cmaxqusb. the 10 i/o ports can be configured as logic inputs, open-drain logic outputs, constant-current sink outputs, or any combination of the above. the ev kit includes three rgb leds (d1, d2, and d3) and one white led (d4). these leds can be enabled and the current through each led can be con- trolled using the max6946 ev kit software (see the detailed description of software section). the max6946 ev kit includes pcb pads (r2?11) on thebottom side of the pcb that can be used to add pullup resistors at each of the max6946? p0?9 ports to oper- ate the ev kit in logic input/output mode. power supplies the max6946 ev kit requires a 2.25v to 3.6v powersupply connected to the vdd and gnd pc pads for normal operation. the ev kit can also use the cmaxqusb interface board? 3.3v power source by installing a shunt across jumper ju1 on the max6946 ev kit and configuring the cmaxqusb interface board vdd. set jumper ju1 in the cmaxqusb to 3.3v. see table 1 for ev kit jumper ju1 configuration. note: insure that all of the data sheet absolute maximumspecifications are not violated when operating the max6946 ev kit. the ev kit also requires a 5.5v to 7v voltage source connected to the vled and gnd pads to power the leds when operating the ev kit in input/current-sink mode. use voltages from 2.25v to 7v to provide a pullup voltage during logic output/input operation. rst input the ev kit features a pushbutton switch, sw1, that con-nects the max6946 rst pin to ground. push and hold the pushbutton switch to connect the rst pin to ground. refer to the rst input section in the max6946/ max6947 ic data sheet to use this rst feature. i/o ports the max6946 ev kit includes three rgb leds (d1, d2,and d3) and one white led (d4) connected to the 10 i/o ports through shunts installed on header j2. the leds are enabled by configuring the respective port on the max6946 to constant-current static output, constant-cur- rent pwm output, or low-logic output mode. for logic operation at each port, remove the shunts on header j2, install 10k pullup resistors on pc pads r2?11, and configure the ports for logic outputs or inputs. i 2 c clock and data inputs the max6946 ev kit features a 2 x 10 right-angle headerreceptacle (j1) to interface with the cmaxqusb inter- face board. pin j1-7 connects to the max6946 clock pin (scl) and pin j1-3 connects to the data pin (sda) for i 2 c-compatibale communications. slide both sw1 dip switches on the cmaxqusb interface board to the onposition to connect pullup resistors to the scl and sda signal lines for proper i 2 c communication. the clock and data input pins can also be accessed atthe scl and sda ev kit pcb pads, respectively. an external i 2 c-compatible controller can be connected to the scl, sda, and gnd pcb pads to communicatewith the max6946 ic. if the external device does not have pullup resistors on the clock and data lines, 2.4k (typ) pullup surface-mount resistors (0603 size) mustbe installed on r12 and r13 pcb pads for proper i 2 c communication. the gnd pcb pad must also be con-nected to the external i 2 c controller. evaluate: max6946/max6947 max6946 evaluation kit/evaluation system ___________________________________________________ ____________________________________ 3 table 1. voltage source selection (jumper ju1) shunt position ev kit function installed* power supplied from the cmaxqusb.note: verify that the cmaxqusb ju1 voltage is configured to 3.3v. not installed user-supplied power source required at theev kit vdd and gnd pads. * default configuration. downloaded from: http:///
evaluate: max6946/max6947 evaluating the max6947 the max6946 ev kit pcb can also be used to evaluatethe max6947 10-port expander. remove the max6946 ic (u1) and replace it with the max6947 ic. the max6947 is pin and function compatible with the max6946, with the exception of pin 12. when evaluat- ing the max6947, the osc pc pad on the ev kit can be used to access the ad0 pin. refer to the max6946/max6947 ic data sheet for a complete description of part-to-part differences. install a 3-pin 0.1in header at ju2 on the ev kit board and use a shunt to configure the max6947 address. see table 2 for jumper ju2 configuration. detailed description of software note: words in boldface are user-selectable features in the software. graphical user interface the user interface (shown in figure 1) is simple to oper-ate. use the computer mouse buttons or press the tab key to navigate through the gui controls. the correct i 2 c write operation is generated to update the internal registers of the max6946 when any of these controlsare used. the software divides ev kit functions into group boxes. the interface group box indicates the device address , i2c bus speed , ev kit status , and the last operation command sent and data sent indicators. this data is used to confirm proper device operation.the global settings box allows the user to program the configuration register, configure the global settingsfor the 10 ports, and read the ports. the tabs on the gui are used to configure individual or groups of ports. the max6946 ev kit software features additional func- tions to simplify operation. automatic diagnostics continually probe the interface board and the max6946ev kit to make sure that all communications are main- tained and that all devices are working. these functions will create some activity on the i 2 c bus. the silence i2c activity checkbox reduces i 2 c bus activity so trig- gering of an oscilloscope while communicating to themax6946 ev kit is made easy. the factory reset but- ton programs the ev kit to the max6946 initial power-up conditions. max6946 evaluation kit/evaluation system 4 __________________________________________________ _____________________________________ table 2. max6947 slave address selection (jumper ju2) shunt position ad0 pin max6947 slave address 1-2 connected to vdd 0x40 2-3 connected to gnd 0x48 downloaded from: http:///
software connection to cmaxqusb the max6946 ev kit software automatically searchesfor the cmaxqusb interface board and max6946 ev kit during startup. the status indicator shows if the interface board and the max6946 ev kit are opera-tional. if the interface board is not found, verify that the command module and the usb cable are connected properly, power is applied to the ev kit, and select the yes button on the retry-connection message box. the nonfunctional gui can be viewed by selecting the no button on the retry-connection message box when attempting to start the software without the cmaxqusb interface board being connected. restart the software with the interface board and ev kit properly connected for normal operation. interface the max6946 ev kit software automatically searchesfor the max6946 during startup. if the software finds the max6946, the status indicator shows that the max6946 is operational. if the max6946 is not found,the status indicator shows that the max6946 was not found and the device address is set to ??? select the auto detect option from the device address combo box to search for the device address.use the i2c bus speed combo box to set the serial bus speed to 400khz or 100khz. global settings the global settings group box includes controls to configure the global current sink from 2.5ma to evaluate: max6946/max6947 max6946 evaluation kit/evaluation system ___________________________________________________ ____________________________________ 5 figure 1. max6946 ev kit software graphical user interface (gui) downloaded from: http:///
evaluate: max6946/max6947 20ma and the hold-off delay , ramp-down time , and ramp-up time from 0 to 4s. the other configuration register bits can be programmed by configuring the osc/ad0 , rstpor , pwm staggered , reset run , and run enable gui controls. the read p7-p0 and read p9-p8 buttons can be used to read the logical state of the max6946 p7?0 and p9 to p8 pins, repec-tively. refer to the max6946/max6947 ic data sheet for a detailed description of each of these functions. note: during read p7-p0 and read p9-p8 operations, the software automatically changes the r/w bit in theaddress from 0 to 1 for proper i 2 c read operation. configuring the i/o ports the gui tabs allow the user to configure the 10 i/oports individually or in groups. once a port(s) tab has been selected, the p_ configuration group box allows the user to configure the port as a low-logic output , high-logic output / logic input , static constant- current sink , constant-current pwm output ( pwm duty cycle slide bar), or disable the led(s) ( led off ). individual port sink current can be configured to half or full of the global current setting ( global current sink ). configuring the i/o ports to low-logic output turns on the leds without regulating the led current atthe respective port. use the mouse or keyboard left/right arrows to move the pwm duty cycle slide bar from left to right to dim or brighten the led(s). refer tothe max6946/max6947 ic data sheet for a detailed description of each of these registers. for true logic input or output configuration of each port, remove the shunts on header j2, install pullup resistors on pc pads r2?11, and use the software to configure the ports for logic outputs or inputs. refer to the i/o ports section in the max6946/max6947 ic data sheet for furtherdetails. simple i 2 c commands there are two methods for communicating with themax6946; through the normal user-interface panel (figure 1) or by using low-level i 2 c commands avail- able through the 2-wire interface diagnostics (figure 2) item from the main program? options menu. a win- dow is displayed that allows i 2 c operations, such as read byte and write byte. to stop normal user-interfaceexecution so that it does not override the manually set values, turn off the update timer by unchecking the automatic diagnostics checkbox in the max6946 main program.the i 2 c dialog boxes accept numeric data in binary, decimal, or hexadecimal. hexadecimal numbers mustbe prefixed by $ or 0x. binary numbers must be exactly eight digits of 0s and 1s. see figure 2 for an example using the 2-wire interface diagnostics tool. note: when using low-level i 2 c commands, the gui interface is no longer synchronized and will not reflectthe ic register settings. general troubleshooting problem: software reports it cannot find the board. is the cmaxqusb interface board power led (led1) lit? is the usb communications cable connected? has windows plug-and-play detected the board? bring up control pane l | syste m | device manager , and look at what device nodes are indicated forusb. if there is an ?nknown device?node attached to the usb, delete it?his forces plug-and-play to try again. problem: unable to find dut (device-under-test). is power connected to the max6946 ev kit? are the scl and sda signals pulled up to vdd through appropriate resistors (2.4k typ)? the cmaxqusb interface board dip-switch sw1enables the on-board resistors. there must be pullup resistors somewhere on the i 2 c bus. if using jumper wires to connect to the i 2 c bus, could the scl and sda signals be swapped? couldthe gnd ground return be missing? max6946 evaluation kit/evaluation system 6 __________________________________________________ _____________________________________ downloaded from: http:///
evaluate: max6946/max6947 max6946 evaluation kit/evaluation system ___________________________________________________ ____________________________________ 7 figure 2. 2-wire interface utility. the above example shows a simple smbuswritebyte operation using the included 2-wire interface diagnostics tool. in this example, the software is writing 0x02 data to register address 0x0a (write to ports p0?9) of the device with a device address of 0x40. the above data sequence sets the max6946 10 ports to constant-current static sink output. downloaded from: http:///
evaluate: max6946/max6947 max6946 evaluation kit/evaluation system 8 __________________________________________________ _____________________________________ n.c. n.c. n.c. n.c. n.c. n.c. scl sda vbus j1 j1-1j1-3 j1-5 j1-7 j1-9 j1-11j1-13 j1-15 j1-17 j1-19 j1-2 j1-4j1-6 j1-8 j1-10 j1-12 j1-14 j1-16 j1-18 j1-20 n.c. vdd ju2open 1 2 3 osc gnd vled r11 open vled r10 open vled r9 open vled r8 open vled r7 open vled r6 open vled r4 open vled r5 open c4 open c3 10 f vled vled gnd 2 3 b d1 g r 41 2 3 b d2 g r 41 2 3 b d3 g r 41 d4 j2 j2-20j2-18 j2-16 j2-14j2-12 j2-10 j2-8 j2-6 j2-4 j2-2 j2-1 j2-7 j2-3 j2-5 j2-13 j2-9 j2-11 j2-19 j2-15 j2-17 8 76 5 9 10 11 12 1314 15 16 1 2 3 4 vled vled r3 open r2 open c2open ju1 vbus vdd vdd gnd vbus r13open sda sda gnd scl vbus r12open scl c1 0.1 f vdd sw1 r14.7k vdd p6p5 gnd p4 p3 p2 p1 p0 sda scl v dd rst osc p9 p8 p7 max6946 u1 figure3. max6946 ev kit schematic downloaded from: http:///
evaluate: max6946/max6947 max6946 evaluation kit/evaluation system ___________________________________________________ ____________________________________ 9 figure 4. max6946 ev kit component placement guide component side figure 5. max6946 ev kit pcb layout?omponent side downloaded from: http:///
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. 10 ____________________maxim integrated products, 120 san gabriel drive, sunnyvale, ca 94086 408-737-7600 2007 maxim integrated products is a registered trademark of maxim integrated products, inc. evaluate: max6946/max6947 max6946 evaluation kit/evaluation system boblet figure 6. max6946 ev kit pcb layout?older side figure 7. max6946 ev kit component placement guide solder side downloaded from: http:///
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