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general description the max34451 evaluation kit (ev kit) provides the hard - ware and software graphical-user interface (gui) neces - sary to evaluate the max34451 pmbus? 16-channel v/i monitor and 12-channel sequencer/marginer. the ev kit includes a max34451 installed as well as four power supplies that can be sequenced, monitored, and margined by the device. ev kit contents assembled circuit board including max34451 mini usb cable features easy evaluation of the max34451 four power-supply channels one current-sense amplifier ev kit hardware is usb powered (usb cable included) usb hid interface windows xp ? - and windows ? 7-compatible software rohs compliant proven pcb layout fully assembled and tested 19-6695; rev 0; 5/13 ordering information appears at end of data sheet. windows and windows xp are registered trademarks and registered service marks of microsoft corporation. pmbus is a trademark of smif, inc. max34451 ev kit photo evaluates: max34451 max34451 evaluation kit
maxim integrated 2 * ep = exposed pad. designation qty description b1 1 black banana jack (gnd) c01, c05, c211 3 1f, x7r ceramic capacitors (0805) c02, c03, c07Cc10, c212 7 0.1f, x7r ceramic capacitors (0805) c06, c11, c20Cc35, c215 0 do not populate, ceramic capacitors (0805) c0aCc0d, c2aCc2d, c160, c162, c165, c201, c202, c204 14 10f, x5r ceramic capacitors (0805) c163 0 do not populate, 470f aluminum capacitor c1aCc1d, c04, c60Cc67, c161, c164, c203, c214 17 0.01f, x7r ceramic capacitors (0805) c213 1 220nf, x7r ceramic capacitor (0805) d1, d5, d22 3 schottky diodes d2Cd4, d7 4 red leds (1206) d20, d21 2 red/green dual leds daCdd 4 green leds (1206) j1, j15 2 2-pin headers, 2.54mm pitch j2, j22 2 4-pin headers, 2.54mm pitch j3Cj6 4 3-pin headers, 2.54mm pitch j7, j8 2 10-pin (2 x 5) headers, 2.54mm pitch j9Cj14, j21 0 do not populate, headers j20 1 5-pin female mini-usb j23 1 8-pin (2 x 4) header, 2.54mm pitch r0Cr17, r36, r37, r102, r107, r108, r119, r201, r202, r214 27 0? 1% resistors (0805) r0aCr0d, r80Cr91, r101, r103, r109, r110, r112, r114, r123, r133, r135, r204 26 100k? 1% resistors (0805) r1aCr1d 4 8.66k? 1% resistors (0805) r2aCr2d 4 3.09k? 1% resistors (0805) designation qty description r3aCr3d 4 49.9? 1% resistors (0805) r4aCr4d 4 267? 1% resistors (0805) r5aCr5d 4 1k? 1% resistors (0805) r20Cr35, r40Cr51, r116Cr118, r132, r134, r162, r215, r216 0 do not populate, resistors (0805) r60Cr67, r100, r130, r131, r210 12 4.7k? 1% resistors (0805) r68Cr75 r111, r161, r164, r207 12 10k? 1% resistors (0805) r104, r113, r115, r124, r211, r212 6 330? 1% resistors (0805) r105, r106, r213 3 2.2k? 1% resistors (0805) r160, r163, r206 3 45.3k? 1% resistors (0805) r165 1 0.1? 1% resistor (0805) r203, r205 2 560? 1% resistors (0805) s1, s2 2 spdt slide switches s3 1 single-pole pushbutton switch s4 1 8-pole dip switch s5Cs7 3 4-pole dip switches tp15, tp17Ctp25, tp27Ctp42 26 white test points tp2Ctp6, tp9Ctp11 8 black test points tp1 1 red test point tp7, tp44 2 orange test points tp8, tp43 2 yellow test points u1 1 pmbus 16-channel v/i monitor and 12-channel sequencer/ marginer (56 tqfn-ep*) maxim max34451etn+ u1aCu1d, u4, u5, u22 7 500ma ldo regulators (8 tdfn-ep*) maxim max8902bata+ u2 1 digital temperature sensor (8 so,150mil) maxim ds75lvs+ u3 1 25v/v precision current-sense amplifer (sot23) maxim max9938teuk+ component list evaluates: max34451 max34451 evaluation kit www.maximintegrated.com
maxim integrated 3 quick start required equipment max34451 ev kit hardware windows xp or windows 7 pc usb port mini-usb cable (included) 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) ensure that jumpers/shunts on j23 and j1 are installed. note: the gnd planes of the usb i 2 c dongle and the ev kit are not connected. the gnd jumper on j23 must be connected for proper communication. 2) ensure that the 4-pole dip switches rs (s5), psen (s6), and pwm (s7) are in the on position. 3) set the ev kit hardware on a nonconductive surface to ensure that nothing on the pcb gets shorted together. 4) prior to starting the gui, connect the ev kit hardware to a pc using the supplied mini-usb cable, or equiva - lent. the power led (d20) should be green and the com led (d21) should be red and slowly flash orange. 5) windows should automatically begin installing the necessary device driver. the usb interface of the ev kit hardware is configured as an hid device and therefore 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, 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. 6) once the device driver installation is complete, visit www.maximintegrated.com/evkitsoftware to download the latest version of the ev kit software, MAX34451EVKITsoftwareinstall.zip. save the ev kit software to a temporary folder. 7) 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 . 8) the installer gui appears. click next and then install . once complete, click close . 9) go to start | all programs . look for the MAX34451EVKITsoftware folder and click on the MAX34451EVKITsoftware.exe inside the folder. 10) when the gui appears, the text to the left of the maxim logo should display ev kit hardware connected . the com led (d21) on the ev kit board should turn green. detailed description of software software startup if the max34451 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 to the left of the maxim logo. 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. note: the .exe file is downloaded as a .zip file. * ep = exposed pad. file description MAX34451EVKITsoftwareinstall.exe application program designation qty description u20 1 microcontroller (28 so) microchip pic18lf2550-i/so u21 1 50ma to 600ma current-limit switch (6 sot23) maxim max4995aaut+ designation qty description x1 1 48mhz, 3.3v oscillator (smd) avx kc3225a48.0000c30e00 9 jumpers/shunts 1 mini-usb cable 1 pcb: max34451 ev kit component list (continued) max34451 ev kit files evaluates: max34451 max34451 evaluation kit www.maximintegrated.com
maxim integrated 4 menu and status bar the file menu item contains save , load , and exit options. to save the current gui configuration, click save project as . this saves the device name, pin names, and the ram crc to an xml file and saves pmbus configura - tions to a hex file. if a device is connected, this reads and saves data directly from the device; otherwise, it saves the configuration that is currently displayed on the gui. the store_deault_all (11h) command is appended to the end of the hex file so that the configuration is saved to the main flash when the hex file is loaded. load project updates the gui with the xml file, writes the hex file to the device, performs a store_default_all (11h), and then reads current values from the device. the ram crc and main flash crc are then read and com - pared to the crc saved in the xml file. if a device is not connected, the hex file is written to a virtual device. the hex file only contains data for the pmbus commands that are stored in flash. create report saves a csv file that contains all the configuration tables. the connection 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 device1 slave address and all the slave addresses found are shown and are select - able. slave addresses 18h and 34h are not selectable to prevent communicating with the alert response address and factory-programmed address. if multiple devices are connected, then the number of devices to read/write is selected with the number of devices option. the auto polling menu item allows the user to set the automatic polling rate. select the delay between reads by choosing 300ms , 600ms , 800ms , 1000ms , 1500ms , or 2000ms . press the auto polling on button in the status bar to start the polling. each poll reads the power status (status_word 79h), fault status (status_word 79h), and the polled values for the data log graph tab. the status and margining tabs are only polled if the tab is currently selected. if multiple devices are being polled, then selected polling rate options can be disabled to account for the longer time it takes to read all devices. to stop polling, press the auto polling off button on the status bar. polling automatically stops if items in the file menu or connection menu are selected. polling also stops if any buttons that involve action with the nv fault log or flash are pressed. the gui lock menu item allows the user to safely browse a configuration by preventing all controls from writing to registers. the clear faults button in the status bar sends the clear_faults (03h) command to clear any faults or warnings. to turn the power supplies on or off, select the power on/power off button, which writes a value to the operation (01h) command. the supplies power on with margining off and power off based on the power down action drop-down list on the sequencing tab. status log the status log below the tabs displays all the actions that the gui performs. whenever a pmbus command is read or written, the action is confirmed by the log. to save the log, press the save log button and the text in the box is saved to a .txt file. the log can also be cleared by press - ing the clear log button. sequencing tab the sequencing tab sheet (figure 1) includes all the sequence configuration and delays. all values on the tab are read when the tab is selected. the on/off config group box controls write to the on_off_config (02h) command to set when the power supplies sequence on or off. the power supplies can be turned on with bias, with the control0/control1 pin, or with the operation (01h) command by selecting the option on the turn power supplies on drop-down list. to change the control0/control1 pins polarity, select the active low or active high radio buttons. the chan - nels can be powered down simultaneously or with a toff delay by selecting the option in the power down action drop-down list. to edit the sequencing table, the output select on the psen/gpo tab must be set to power supply enable (psen) and the input select on the monitoring tab must be set to sequence + voltage monitor . the sequence on select , pg/gpi select , and seq match columns read/write to mfr_seq_config (e8h). the pg/gpi select columns can only be edited if the sequence on select for that channel is set to one of the pg/gpi combo options. to edit the seq match col - umn the sequence on select for that channel must be set to one the of seq pin match options. the sequencing delays can be set by writing values to ton delay (ton_ delay 60h), ton max (ton_max_fault_limit 62h), ton seq max (mfr_ton_seq_max e6h), and toff delay (toff_delay 64h). each channel responds to the fault pins selected in the fault pin response col - umns that read/write to mfr_fault_response (d9h). evaluates: max34451 max34451 evaluation kit www.maximintegrated.com
maxim integrated 5 figure 1. max34451 ev kit gui (sequencing tab) evaluates: max34451 max34451 evaluation kit www.maximintegrated.com
maxim integrated 6 sequencing graph tab the sequencing graph tab sheet (figure 2) displays the timing diagrams for all the sequencing channels. to edit a channels sequencing timing, the output select on the psen/gpo tab must be set to power supply enable (psen) and the input select on the monitoring tab must be set to sequence + voltage monitor . when the power up radio button is selected, the ton delay (ton_delay 60h) and ton max (ton_max_fault_limit 62h) values are displayed on the graph. to change ton delay , click and drag the green vertical bar; to change ton max , click and drag the red vertical bar. if ton max is set to 0ms, then this limit is and the red bar are disabled. to set a precise time with the graph, click and hold the green or red vertical bar for a zoomed-in timeline. if a chan - nel is set up to generate a seq on the monitoring tab, a yellow gen tag is displayed to show which sequence is generated. the sequence on select column is read from the sequencing tab. if this column is set to a seq pin match option, a seq yellow tag appears at the time location displayed in the event tag column. if there is a gen tag that matches the seq tag, the seq tag is lined up with the gen tag to have the same time. if there is not a gen tag that matches the seq tag, the tag can be moved to a location where the user expects this signal to occur by dragging the yellow tag or editing the value in the event tag column. if the sequence on select is set to a pg/gpi combo option, the pg/gpi select columns on the sequencing tab are read to see which channel combination triggers the sequence. if any of these checked channels are set to gpi in the input select column on the monitoring tab, a yellow gpi tag appears at the time location in the event tag column, which can be edited. if the checked channels are not set to gpi, a pg yellow tag appears. this pg tag is placed at the last ton delay to occur in the checked channels. the power down graph displays the toff delay (toff_delay 64h) and can be changed by clicking and dragging the green vertical bar. to view more of the time in the diagram, click and drag the timeline at the bottom, or use the zooming controls in the upper right-hand corner. to change the order of the channels, press the sort by time button or the sort by device button for multiple devices. when in sort by device mode, the channels can be reordered by clicking and dragging the gripper box in the upper left-hand corner of the channel row. the sequencing graph also has the ability to detect circular dependance errors. monitoring tab the monitoring tab sheet (figure 3) displays the fault/ warn limit settings for each channel and for each tempera - ture sensor. to read the settings, click on the monitoring tab and all the values are automatically read. to write to a value, click on the corresponding cell, type in a valid value, and either click another cell or press enter on the keyboard. in the voltage and current table, the input select and seq generate columns write to mfr_channel_config (e4h). some columns might be grayed out depending on what is selected in the input select column. the nominal and v ratio columns are calculated based on a nominal adc level of 1.8v to set the vout_scale_monitor (2ah). the resistive v ratio is found by dividing 1.8v by the nominal value. the c gain column writes to iout_cal_gain (38h) to set the ratio of the voltage at the adc input to the sensed current. the fault/warn limits can be set by entering the voltage/ current level or the percent of the nominal in the uv fault (vout_uv_fault_limit 44h), uv warn (vout_uv_ warn_limit 43h), ov warn (vout_ov_warn_limit 42h), ov fault (vout_ov_fault_limit 40h), pg on (power_good_on 5eh), pg off (power_good_ off 5fh), oc warn (iout_oc_warn_limit 46h), or oc fault (iout_oc_fault_limit 4ah) columns. in the temperature table, the sensors can be enable/ disabled in the enable column, which writes to a bit in mfr_temp_sensor_config f0h). the ot warn/ fault limits can be set by entering a value in the ot warn (ot_warn_limit 51h) or ot fault (ot_fault_limit 4fh) columns. the adc and averaging settings can be adjusted with the adc conversion time , adc averaging , or iout averaging drop-down lists, which all write to mfr_mode (d1h). evaluates: max34451 max34451 evaluation kit www.maximintegrated.com
maxim integrated 7 figure 2. max34451 ev kit gui (sequencing graph tab) evaluates: max34451 max34451 evaluation kit www.maximintegrated.com
maxim integrated 8 figure 3. max34451 ev kit gui (monitoring tab) evaluates: max34451 max34451 evaluation kit www.maximintegrated.com
maxim integrated 9 psen/gpo tab the psen/gpo tab sheet (figure 4) sets the function of the psenn pins. the output select , pg/gpi or alarm channel select , and psen/gpo output type columns write to bits in the mfr_psen_config (d2h) command. output select sets the function of the psenn pin and the psen/gpo output type column sets the output logic of the pin. for psen10 and psen11, the output select column has an extra option to configure psen10 as fault2 and psen11 as seq . if either of these options are selected, jumpers j5 or j4 on the ev kit board should be moved to the corresponding position. the pg/gpi or alarm channel select , ton delay (ton_delay 60h) and toff delay (toff_delay 64h) columns can only be edited when the output select is set to pg/gpi combination or alarm . pwm/gpo tab the pwm/gpo tab sheet (figure 5) sets the function of the pwmn pins. all the columns in the pwm table write to the mfr_pwm_config (e7h) command. the output select column sets the function of the pwmn pin and the pwm/gpo output type sets the output logic of the pin. for pwm7, the output select column has an extra option to configure it as fault1 . if this option is selected, jumper j6 on the ev kit board should be moved to the fault1 position. the pg/gpi or alarm channel select , on delay , and off delay columns can only be edited when the output select is set to pg/gpi combination or alarm . fault confg tab the fault config tab sheet (figure 6) contains all the fault configuration settings. the fault retry time sets the value in mfr_fault_retry (dah). the fault configura - tion table writes to a channels mfr_fault_response (d9h). to edit a channels configuration, the input select on the monitoring tab must be set to monitor voltage or current. to edit the fault pin assertion or fault pin response columns, set the global column to global . margining tab the margining tab sheet (figure 7) includes the margin configurations, margin fault status, a pwm calculator, and a dac calculator for the ds4424. all values on the tab are read when the tab is selected. to edit a chan - nels margin options, the output select on the psen/ gpo tab must be set to power supply enable (psen) and the input select on the monitoring tab must be set to sequence + voltage monitor . for channels 0C7, the output select on the pwm/gpo tab must also be set to pwm operation . the margin column turns the margin on/off by writing to the operation (01h) com - mand. to force all the channels to the same margin, select the state in the margin all control drop-down list. the slope , open loop , pwm level , and dac value configure the pwmn outputs and the external ds4424 by writing bits in the mfr_margin_config (dfh) command. the margining limits can be set by entering the voltage level or the percent of the nominal in the margin low (vout_margin_low 26h) and margin high (vout_margin_high 25h) columns. when the margining is turned on, the margin fault status is shown in the status column read from status_mfr_specific (80h). the polled column displays the channel voltage read from read_vout (8bh). to read the status and polled values, press the read status and vout button or turn on polling with the auto polling on button. the margin faults can be cleared by pressing the clear faults button in the status bar. evaluates: max34451 max34451 evaluation kit www.maximintegrated.com
maxim integrated 10 figure 4. max34451 ev kit gui (psen/gpo tab) evaluates: max34451 max34451 evaluation kit www.maximintegrated.com
maxim integrated 11 figure 5. max34451 ev kit gui (pwm/gpo tab) evaluates: max34451 max34451 evaluation kit www.maximintegrated.com
maxim integrated 12 figure 6. max34451 ev kit gui (fault config tab) evaluates: max34451 max34451 evaluation kit www.maximintegrated.com
maxim integrated 13 figure 7. max34451 ev kit gui (margining tab) evaluates: max34451 max34451 evaluation kit www.maximintegrated.com
maxim integrated 14 the pwm calculator is used to find the series resistance (r3) and pwm level. the equations used to calculate the outputs are given in table 1. the dac calculator is used to find the ds4424 exter - nal resistor (r fs ), which determines the full-scale and step-size current for the dac. if r fs is calculated to be outside its limits (40k < r fs < 160k), then the resistor is forced to the edge of the limit and the ds4424 rfs edit box turns red. the equations used to calculate the outputs are given in table 2. status tab the status tab sheet (figure 8) displays all the faults, warning, and device id information. to read all the output values, faults, and warnings, press the read device 1 status button or turn on polling with the auto polling on button. the fault and warning bits are read from status_vout (7ah), status_iout (7bh), status_ mfr_specific (80h), and status_temperature (7dh). the polled values are read from read_vout (8bh), read_iout (8ch), and read_temperature (8dh). each color indicator turns green if the status is good, red if there is a fault, or yellow to indicate a warn - ing. the polled value might not reflect the fault or warning because some bits are latches and have to be cleared. to clear the faults and warnings, press the clear faults button in the status bar to send the clear_faults (03h) command. the time count displays the 32-bit counter read from the mfr_time_count (ddh) command. the id commands table displays all the id information of the device. press the read id button to read all the commands in the table. data log graph tab the data log graph tab sheet (figure 9) plots the polled values in a graph and keeps track of the mini - mum and maximum values for each channel voltage or current and each temperature sensor. to read the polled values, press the data log read button. each data log reads every channels voltage (read_vout 8bh) or current (read_iout 8ch) and every temperature sen - sor (read_temperature 8dh). the software finds the minimum and maximum values over multiple reads. to plot the value being read, press the auto polling on button and the poll count displays the number of reads that have been tracked in the data log. when the polled count reaches 10,000, the graph deletes the oldest polled values and adds a new polled value. the min/max values are still based on all the poll-count values, but the graph only displays the latest 10,000 polled values. to reset the poll count and all the min/max values, select data log reset . to turn off data logging during polling, check the data log off checkbox. the select data drop-down list is used to select the voltage, current, or temperature data to display on the graph and in the min/max data table. to save all the data graphed to a csv file, press the save data log button. fault log dashboard tab the fault log dashboard tab sheet (figure 10) dis - plays all 15 nv fault logs in table format. when the tab is selected, the overwrite and fault log depth are read. when the fault log is full, the enable overwrite can be checked to automatically overwrite previous logs. the fault log depth can be adjusted with the fault log depth drop-down list. the enable overwrite and fault log depth are read from bits in mfr_nv_log_config (d8h). to read all 15 fault logs, press the read all fault logs button. this command takes at least 10s to com - plete. for each channel within a fault log, the voltage/ current table shows the fault/warning status, minimum value, maximum value, and the last three black box read - ings. the temperature table shows the ot fault sta - tus, the peak value, and the last temperature reading. to clear or force the fault log, press the clear nv fault log or force nv fault log buttons, respectively. these but - tons write to a bit in mfr_nv_log_config (d8h). the dump logs to file button saves all the fault log tables in a csv file. output equations i fb = (v out )/(r1 + r2) r3 = (v fb - 0.3)/(i fb x margining range x 120%) pwm level = 256 x (v fb /v dd ) output equations i fb = (v out )/(r1 + r2) ds4424 r fs = (7.75)/(i fb x margining range x 120%) ds4424 full scale = (0.976 x 127)/(16 x r fs ) ds4424 step size = full scale/64 table 1. pwm calculator table 2. dac calculator evaluates: max34451 max34451 evaluation kit www.maximintegrated.com
maxim integrated 15 figure 8. max34451 ev kit gui (status tab) evaluates: max34451 max34451 evaluation kit www.maximintegrated.com
maxim integrated 16 figure 9. max34451 ev kit gui (data log graph tab) evaluates: max34451 max34451 evaluation kit www.maximintegrated.com
maxim integrated 17 figure 10. max34451 ev kit gui (fault log dashboard tab) evaluates: max34451 max34451 evaluation kit www.maximintegrated.com
maxim integrated 18 fault log tab the fault log tab sheet (figure 11) displays a single log in the nv fault log. to read the fault log, press the read nv fault log button and all 255 bytes from mfr_nv_ fault_log (dch) are displayed in the table. the fault log number is displayed above the read nv fault log button. to save the current fault log displayed in the table, press the dump to a file button and the table is saved as a csv file. pins tab the pins tab sheet (figure 12) shows all the pin names, pin numbers, and pin descriptions. the pin name and description columns can be edited to specify how the pin is configured. the pin names listed in the pin name column are copied to the pin name columns on the other tabs and are saved in the xml file when a project is saved. registers tab the registers tab sheet (figure 13) displays all the pmbus commands and their current data. to read the reg - isters, select a page in the top drop-down list and all the pmbus commands valid for that page are automatically read. the commands not valid for that page are grayed out. press the read all button to read the registers again. to write to a command, enter the hex value in the cell and click another cell or press enter on the keyboard. the crc of all three memory arrays in the device can be read by pressing the read crc of all memory arrays button, which reads/writes to the mfr_crc (feh) command. the current register configuration can be saved to main flash by pressing the save to main flash button, which sends the store_default_all (11h) command. the configuration can also be saved to backup flash by pressing the save to back up flash button, which reads/writes to the mfr_store_all (eeh) command. to return the device to the configuration in main flash, press the restore from main flash button, which sends the restore_default_all (12h) command. the device can also be returned to the configuration stored in backup flash by pressing the restore from back up flash button to read/write to the mfr_restore_all (efh) command. to reset the device, press the soft reset button to write to a bit in mfr_mode (d1h). the command description shows the bitmap for selected pmbus commands. select the command in the drop- down list and the table below shows a description of each bit for that command. multiple devices the gui has the ability to display data for up to four devices. if multiple slave addresses are detected, the number of devices option in the connection menu allows the user to choose how many devices to display. to choose the order of devices, select the appropriate slave address in the devicex slave address options. most tabs have separate tables and controls for each device. the fault log dashboard , fault log , and register tabs all have a drop-down list to select the device to read/ write if the number of devices is greater than one. evaluates: max34451 max34451 evaluation kit www.maximintegrated.com
maxim integrated 19 figure 11. max34451 ev kit gui (fault log tab) evaluates: max34451 max34451 evaluation kit www.maximintegrated.com
maxim integrated 20 figure 12. max34451 ev kit gui (pins tab) evaluates: max34451 max34451 evaluation kit www.maximintegrated.com
maxim integrated 21 figure 13. max34451 ev kit gui (registers tab) evaluates: max34451 max34451 evaluation kit www.maximintegrated.com
maxim integrated 22 detailed description of hardware user-supplied i 2 c interface to communicate with the max34451 with a user-supplied i 2 c interface, first remove j23 jumpers to disconnect the usb i 2 c dongle. if the dongle is no longer desired, it can be separated from the ev kit by snapping the pcb at the scored line. connect test points sda, scl, gnd, and 5v to the off-board i 2 c interface. the i 2 c interface should operate at 3.3v. user-supplied power supplies to disconnect the on-board power supplies, turn off 4-pole dip switches rs (s5), psen (s6), and pwm (s7). the power supplies gnd should be connected to the banana jack (gnd). connect the desired psenn pins to the enable pin on the power supply, and the rsn pins to a voltage-divider on the output of the power supply. the voltage-divider is only required if the output voltage is greater than 1.8v. for pwm margining, the pwmn outputs can be connected to the feedback of the power supply for channels 0C7. resistors r68Cr75 should be adjusted to match the power-supply feedback circuitry. refer to the max34451 ic data sheet for details or use the pwm calculator to determine the proper values. user-supplied ds75lv to use an off-board digital temperature sensor, connect msda, mscl, and gnd on j3 to the ds75lv. the slave address for the user-supplied ds75lv should be 92h, 94h, or 96h. the on-board ds75lv has slave address 90h. current-sense amplifer the ev kit comes with an on-board 25v/v current-sense amplifier (u3) to demonstrate how the device can monitor current. the output of the amplifier is connected to rs15 and can be removed by removing the jumper on j15. multiple device system to chain multiple max34451 ev kits together as one system, follow the steps below. note: do not chain more than four ev kits together. 1) remove power to all ev kits. 2) on one ev kit, populate the four jumpers on j23. for all other boards, remove the four jumpers on j23. 3) for all ev kits, switch the sda and scl signals on the 8-pole dip switch (s4) to on. 4) if using the other signals on the 8-pole dip, then switch those signals to on; otherwise, turn the switches off. note: to connect the seq , fault1 , or fault2 signals, jumpers j4, j6, or j5 must also be set to seq , fault1 , or fault2 , respectively. 5) connect the ev kit signals together using ribbon-cable connectors on j7 or j8. to power and communicate to another ev kit, ensure that 5v, gnd, sda, and scl are all connected on j7 or j8. all other signals are optional. 6) connect the ev kit with the four jumpers on j23 to a pc using the usb cable. evaluates: max34451 max34451 evaluation kit www.maximintegrated.com
maxim integrated 23 *default position. *default position. led color description d2 red fault0 : a fault has occurred. d3 red fault1 : a fault has occurred. d4 red fault2 : a fault has occurred. d7 red alert : a fault or warning has occurred. da green vout0: channel 0 is on. db green vout1: channel 1 is on. dc green vout2: channel 2 is on. dd green vout3: channel 3 is on. 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 fashes red when an i 2 c command is received. green initialized: hardware has been initialized by software. switch switch position description s1 on* control0: pulls the control0 pin high. s2 on* control1: pulls the control1 pin high. s3 pressed reset: pulls the rst pin low to reset the device. s4 on* multiple devices: connects all the multiple device signals to headers j7 and j8. s5 on* rs0Crs3: connects rsn of the device to the output of the power-supply channel. s6 on* psen0Cpsen3: connects psenn of the device to the enable pin of the power-supply channel. s7 on* pwm0Cpwm3: connects pwmn of the device to the feedback of the power-supply channel. jumper jumper position description j1 vdd-vdut connects vdd to vdut (u1). j4 psen11* connects the psen11/gpo11/ seq pin to the psen header. seq connects the psen11/gpo11/ seq pin to a pullup resistor and seq test point. j5 psen10* connects the psen10/gpo10/ fault2 pin to the psen header. fault2 connects the psen10/gpo10/ fault2 pin to a pullup resistor, led, and fault2 test point. j6 pwm7* connects the pwm7/gpo19/ fault1 pin to the pwm header. fault1 connects the pwm7/gpo19/ fault1 pin to a pullup resistor, led, and fault1 test point. j15 csa connects the current sense amplifer (u3) output to rs15. j23 5v-5v supplies 5v from the usb i 2 c dongle to the ev kit board. sda-sda connects sda from the usb i 2 c dongle to the u1 device sda. gnd-gnd connects gnd from the usb i 2 c dongle to the ev kit board gnd. scl-scl connects scl from the usb i 2 c dongle to the u1 device scl. table 3. description of leds table 4. description of switches table 5. description of jumpers evaluates: max34451 max34451 evaluation kit www.maximintegrated.com
maxim integrated 24 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 6 to help trouble - shoot the issue. 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. no slave address found and read/writes fail jumper j1 make sure jumper j1 is installed to power the u1 device. jumper j23 make sure four jumpers on j23 are installed. channels do not turn on is there a control# fault on the status tab of the gui? if the on_off_config command is set as turn-on power supplies with the control0/control1 pin, then make sure s1 and s2 are in on position. is the alert led on and all channel leds off? if so, make sure switch psen (s6) is in the on position to connect the psens of u1 device to channel power supplies. is the alert led on and at least one channel led on? if so, make sure switch rs (s5) is in the on position to connect the power-supply outputs to the u1 device. margining is not working, voltage is not changing s7 make sure the pwm (s7) switch is in the on position to connect the pwms of the u1 device to the fb of channels 0C3. chaining multiple ev kits together using j7 and j8 does not seem to work s4 make sure that all the switches on the 8-pole dip switch (s4) are in the on position. the fault1 led does not turn on. j6 if the channel is confgured to assert the fault1 pin, make sure the output select for pwm7 on the pwm/gpo tab is set to fault1 . on the ev kit, make sure the j6 jumper is set to fault1 . the fault2 led does not turn on. j5 if the channel is confgured to assert the fault2 pin, make sure the output select for psen10 on the psen/gpo tab is set to fault2 . on the ev kit, make sure the j5 jumper is set to fault2 . the seq input/output signal is not working j4 if the channel is confgured to generate or match a seq signal, make sure the output select for psen11 on the psen/gpo tab is set to seq . on the ev kit, make sure the j4 jumper is set to seq . the current monitored on rs15 does not work j15 make sure the jumper on j15 is populated to connect the output of the current-sense amplifer to rs15. table 6. troubleshooting evaluates: max34451 max34451 evaluation kit www.maximintegrated.com
maxim integrated 25 figure 14a. max34451 ev kit schematic (sheet 1 of 3) rs4 rs3 rs2 rs1 rs0 cont rol 1 f aul t 0 control 0 rst p sen4 p sen3 p sen2 p sen1 p sen0 rsg1 rsg0 p w m 4 p w m 3 p wm6 a l ert p wm5 r s 5 r s 6 r s 7 r s 8 r s 9 r s 1 0 r s 1 1 r s 1 2 r s 1 3 p s e n 7 p s e n 6 p s e n 5 m s c l r s 1 4 m s d a p s e n 8 p s e n 9 p sen11 addr r102 0 r 1 0 1 1 0 0 k r103 1 0 0 k r111 10k r104 330 r 1 0 0 4 . 7 k r107 0 r109 100k r106 2.2k r105 2.2k r108 0 r132 dnp r133 100k c10 0.1uf c02 0.1uf c08 0.1uf c07 0.1uf 100 m ohm m a x e sr c06 dnp t p 15 control 1 d 2 red gnd gnd gnd gnd gnd gnd gnd t p 23 sda t p 19 control 0 t p 21 scl t p 17 f aul t 0 3.3v 3.3v r123 1 0 0 k r124 330 d 7 red. t p 22 a l e r t vdd vdd vdd 1 2 3 s1 s w - s p d t 2 3 4 1 j 2 i 2c dongl e scl sda vdd vdd 1 b 1 b l a c k banana jack gnd gnd gnd gnd gnd gnd gnd gnd vdut gnd 1 2 s3 s w - p b c03 0.1uf v d u t c05 1uf c04 0.01uf r e g 1 8 sda 1 scl 2 o.s. 3 gnd 4 a 2 5 a 1 6 a 0 7 v c c 8 u 2 ds75 r134 dnp r135 100k r130 4.7k r131 4.7k 1 2 3 j 3 3.3v gnd e p / v s s 5 7 rs4/gp i 4 1 rs3/gp i 3 2 rs2/gp i 2 3 rs1/gp i 1 4 rs0/gp i 0 5 control 1 6 vdda 7 n c 8 vss 9 f aul t 0 10 control 0 11 rst 12 p sen11/gp o11/seq 13 rs15/gp i 15 14 s d a 1 5 s c l 1 6 v d d 1 7 r e g 1 8 1 8 p s e n 1 0 / g p o 1 0 / f a u l t 2 1 9 r s 1 4 / g p i 1 4 2 0 m s c l 2 1 m s d a 2 2 n c 2 3 p w m 0 / g p o 1 2 2 4 p w m 1 / g p o 1 3 2 5 p w m 2 / g p o 1 4 2 6 p w m 3 / g p o 1 5 2 7 p w m 4 / g p o 1 6 2 8 p wm5/gp o17 29 a l e r t 30 addr 31 p wm6/gp o18 32 p wm7/gp o19/f aul t 1 33 rsg0 34 n c 35 rsg1 36 n c 37 p s e n0/ g p o 0 38 p s e n1/ g p o 1 39 p s e n2/ g p o 2 40 p s e n3/ g p o 3 41 p s e n4/ g p o 4 42 p s e n 5 / g p o 5 4 3 p s e n 6 / g p o 6 4 4 p s e n 7 / g p o 7 4 5 p s e n 8 / g p o 8 4 6 r s 1 3 / g p i 1 3 4 7 p s e n 9 / g p o 9 4 8 r s 1 2 / g p i 1 2 4 9 r s 1 1 / g p i 1 1 5 0 r s 1 0 / g p i 1 0 5 1 r s 9 / g p i 9 5 2 r s 8 / g p i 8 5 3 r s 7 / g p i 7 5 4 r s 6 / g p i 6 5 5 r s 5 / g p i 5 5 6 u 1 max3 4451 500 m ohm m ax esr from reg18 to gnd vdd c162 10uf 3.3v t p 44 5 v t p 43 3.3v c161 0.01uf r161 10k r160 45.3k i n 1 gnd 2 e n 3 g s 4 p o k 5 f b 6 b y p 7 out 8 u 4 max8902b r162 dnp c01 1uf gnd t p 1 vdd vdd 1 2 d 1 1 2 j 1 vdd- vdut vdut c165 10uf v l e d c164 0.01uf r164 10k r163 45.3k i n 1 gnd 2 e n 3 g s 4 p o k 5 f b 6 b y p 7 out 8 u 5 max8902b 5 v 5 v c160 10uf v l e d v l e d gnd + c163 dnp 470uf a l u m r s1 5 1 2 d 5 r165 0.1 dongle5v gnd 1 gnd 2 out 3 rs- 4 rs+ 5 u 3 max9938teuk + rs15' gnd header5v c09 0.1uf 1 2 3 s2 s w - s p d t gnd gnd p w m 0 p w m 1 p w m 2 c11 dnp r116 dnp r117 dnp r118 dnp r119 0 t p 24 addr gnd m s c l m s d a vdd 1 2 3 j 6 con3 1 2 3 j 5 con3 1 2 3 j 4 con3 r114 1 0 0 k r115 330 d 3 red. t p 25 f aul t 1 vdd v l e d p wm7 f aul t 1 r112 1 0 0 k r113 330 d 4 red. t p 20 f aul t 2 vdd v l e d f aul t 2 p sen10 r110 1 0 0 k t p 18 s e q vdd s e q 1 2 3 4 5 6 7 8 16 15 14 13 12 11 10 9 s4 s w d i p - 8 1 2 3 4 5 6 7 8 9 10 j 8 hdr_10p i n 1 2 3 4 5 6 7 8 9 10 j 7 hdr_10p i n sda scl f aul t 1 f aul t 2 seq control 0 control 1 gnd f aul t 0 header5v gnd evaluates: max34451 max34451 evaluation kit www.maximintegrated.com
maxim integrated 26 figure 14b. max34451 ev kit schematic (sheet 2 of 3) 5 v c0a 10uf c1a 0.01uf r1a 8.66k r2a 3.09k r3a 49.9 r4a 267 r5a 1k c2a 10uf d a l e d gnd r10 0 r11 0 r 8 0 r 9 0 r 6 0 r 7 0 r 4 0 r 5 0 r 2 0 r 3 0 r 0 0 r 1 0 r 3 1 d n p r 3 0 d n p r 2 9 d n p r 2 8 d n p r 2 7 d n p r 2 6 d n p r 2 5 d n p r 2 4 d n p r 2 3 d n p r 2 2 d n p r 2 1 d n p r 2 0 d n p rs0 rs1 rs2 rs3 rs4 rs5 rs6 rs7 rs8 rs9 r s1 0 r s1 1 1 1 2 2 3 3 4 4 5 5 6 6 7 7 8 8 j10 dnp 1 1 2 2 3 3 4 4 5 5 6 6 7 7 8 8 j11 dnp rs0' rs1' rs2' rs3' r 5 1 d n p r 5 0 d n p r 4 9 d n p r 4 8 d n p r 4 7 d n p r 4 6 d n p r 4 5 d n p r 4 4 d n p r 4 3 d n p r 4 2 d n p r 4 1 d n p r 4 0 d n p r 8 0 1 0 0 k 1 2 3 4 5 6 7 8 j13 dnp 10 11 12 9 j14 dnp p sen0' p sen1' p sen2' p sen3' p sen0 p sen1 p sen2 p sen3 p sen4 p sen5 p sen6 p sen7 p sen8 p sen9 p sen10 p sen11 r 8 1 1 0 0 k r 8 2 1 0 0 k r 8 3 1 0 0 k r 8 4 1 0 0 k r 8 5 1 0 0 k r 8 6 1 0 0 k r 8 7 1 0 0 k r 8 8 1 0 0 k r 8 9 1 0 0 k r 9 0 1 0 0 k r 9 1 1 0 0 k vdd gnd gnd r0a 100k t p 27 p sen0 p sen0' vout0 f b 0 t p 30 f b 0 rs0' t p 28 vout0 t p 29 rs0 f b 0 f b 1 f b 2 f b 3 1 2 j12 dnp r 3 7 0 r 3 6 0 r17 0 r16 0 rsg0 rsg1 i n 1 gnd 2 e n 3 g s 4 p o k 5 f b 6 b y p 7 out 8 u1a max8902b 5 v c0b 10uf c1b 0.01uf r1b 8.66k r2b 3.09k r3b 49.9 r4b 267 r5b 1k c2b 10uf d b l e d gnd r0b 100k t p 31 p sen1 p sen1' vout1 f b 1 t p 34 f b 1 rs1' t p 32 vout1 t p 33 rs1 i n 1 gnd 2 e n 3 g s 4 p o k 5 f b 6 b y p 7 out 8 u1b max8902b 5 v c0c 10uf c1c 0.01uf r1c 8.66k r2c 3.09k r3c 49.9 r4c 267 r5c 1k c2c 10uf d c l e d gnd r0c 100k t p 35 p sen2 p sen2' vout2 f b 2 t p 38 f b 2 rs2' t p 36 vout2 t p 37 rs2 i n 1 gnd 2 e n 3 g s 4 p o k 5 f b 6 b y p 7 out 8 u1c max8902b 5 v c0d 10uf c1d 0.01uf r1d 8.66k r2d 3.09k r3d 49.9 r4d 267 r5d 1k c2d 10uf d d l e d gnd r0d 100k t p 39 p sen3 p sen3' vout3 f b 3 t p 42 f b 3 rs3' t p 40 vout3 t p 41 rs3 i n 1 gnd 2 e n 3 g s 4 p o k 5 f b 6 b y p 7 out 8 u1d max8902b 1 2 3 4 8 7 6 5 s7 4 - p o l e d i p sw 1 2 3 4 8 7 6 5 s5 4 - p o l e d i p sw 1 2 3 4 8 7 6 5 s6 4 - p o l e d i p sw 100 m il header testpoints 100 m il header testpoints l ocated with rsx testpoints. r12 0 r13 0 r14 0 r15 0 r 3 2 d n p r 3 3 d n p r 3 4 d n p r 3 5 d n p r s1 2 r s1 3 r s1 4 r s1 5 gnd 1 2 3 4 5 6 7 8 j 9 dnp r68 10k r60 4.7k c61 0 . 0 1 u f r69 10k r61 4.7k r70 10k r62 4.7k r71 10k r63 4.7k r72 10k r64 4.7k r73 10k r65 4.7k r74 10k r66 4.7k r75 10k r67 4.7k c62 0 . 0 1 u f c63 0 . 0 1 u f c64 0 . 0 1 u f c65 0 . 0 1 u f c60 0 . 0 1 u f c66 0 . 0 1 u f c67 0 . 0 1 u f gnd p wm0 p wm1 p wm2 p wm3 p wm4 p wm5 p wm6 p wm7 rs15' c 2 5 d n p c 2 6 d n p c 2 7 d n p c 2 8 d n p c 2 9 d n p c 3 0 d n p c 3 1 d n p c 3 2 d n p c 3 3 d n p c 2 4 d n p c 2 3 d n p c 2 2 d n p c 2 1 d n p c 3 4 d n p c 2 0 d n p c 3 5 d n p 100 m il header testpoints 1 2 j15 con2 evaluates: max34451 max34451 evaluation kit www.maximintegrated.com
maxim integrated 27 figure 14c. max34451 ev kit schematic (sheet 3 of 3) mcl r 1 p 3,hb 2 com_l ed,boot 3 p 1 4 p 2 5 rcv 6 p 6, cs 7 gnd 8 osc1 9 osc2 10 p 4 11 uoe 12 p s_var 13 vusb 14 d - ,vm 15 d+,vp 16 enum 17 p 9,sdo 18 gnd 19 vdd 20 p 11,sdi ,sda 21 p 10,sck ,sc l 22 vmo 23 v p o 24 usb_de t 25 p 5 26 p 7,1w_dq 27 p 8,1w _ p u 28 u20 p i cfor ds3900 vbus 1 d - 2 d + 3 i .d. 4 gnd 5 j20 usb_5p i n r203 560 r201 0 r202 0 r211 330 r212 330 r213 2.2k r215 dnp r216 dnp r214 0 c204 10uf c212 0.1uf c211 1uf c202 10uf c201 10uf c213 220nf c214 0.01uf d - d + vbus 5v' 3.3v' 1 2 d22 3.3v' 3.3v' d + d - 3.3v' gnd' 5 v 3.3v scl ' sda' r210 4.7k c215 dnp 1 2 j21 dnp v p p osc1 h b c o m g r e e n d21b r e d d21a c o m i n h 1 gnd 2 out 3 v c c 4 x 1 osc_cmos_4pi n 3.3v' c l k 3.3v' 2 3 4 1 j22 i 2c dongl e scl sda gnd dongle5v 5v' r204 100k r e d d20a g r e e n d20b r205 560 c203 0.01uf r207 10k r206 45.3k out 1 gnd 2 seti 3 o n 4 i n 5 f l a g 6 u21 max4995a i n 1 gnd 2 e n 3 g s 4 p o k 5 f b 6 b y p 7 out 8 u22 max8902b 1 2 3 4 5 6 7 8 j23 gnd' gnd' gnd' gnd' usb to i2c programming board maxim * maxi m_l ogo 2x4 h eader i s the only connection between programming board and max34451 ev kit. evaluates: max34451 max34451 evaluation kit www.maximintegrated.com
maxim integrated 28 figure 15. max34451 ev kit pcb layouttop layer evaluates: max34451 max34451 evaluation kit www.maximintegrated.com
maxim integrated 29 figure 16. max34451 ev kit pcb layoutbottom layer evaluates: max34451 max34451 evaluation kit www.maximintegrated.com
maxim integrated 30 # denotes an rohs-compliant device that may include lead(pb), which is exempt under the rohs requirements part type MAX34451EVKIT# ev kit ordering information evaluates: max34451 max34451 evaluation kit www.maximintegrated.com
? 2013 maxim integrated products, inc. 31 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. maxim integrated and the maxim integrated logo are trademarks of maxim integrated products, inc. evaluates: max34451 max34451 evaluation kit 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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