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| page 1 of 14 features ? demonstrates the capabilities of the ds2782 standalone fuel gauge, including: ? estimation of available capacity for li+ cells ? voltage measurement ? current measurement ? current accumulation ? temperature measurement ? information storage ? identification ? interfaces to the usb por t of a pc running windows ? xp or older operating system evaluation kit contents 1 pc. evaluation board 1 pc. ds9123o usb adapter 1 pc. rj-11 cable equipment needed 1. a pc running windows xp or older operating system and an available usb port. 2. cables with mini-grabber style clips or the ability to solder directly to connection pads. 3. a lithium-ion battery and a power supply and/or load circuit. index evaluation kit contents equipment needed introduction setup and installation board connections software installation selecting the com port program menus menu windows status register program tabs real time tab parameters tab memory tab log data tab DS2782EVKIT+ standalone fuel gauge ic evaluation kit 19-4854; rev 9/09 www.maxim-ic.com windows xp is a registered trademark of microsoft corp. downloaded from: http:///
DS2782EVKIT+ 2 of 14 introduction the ds2782 evaluation kit (ev kit) makes perf ormance evaluation, software development, and prototyping with the ds2782 standalone fuel gauge easy. the evaluation board interfaces to a pc through a ds9123o usb adapter and rj-11 cable connection. the ds2782 ev kit evaluation software gives the user complete control of a ll functions of the ds2782. separate control tabs allow the user access to all eeprom and ram memory locations, all control registers, and real-time updates of all monitored parameters. the software also incorporates a data- logging feature to monitor a cell over time. the evaluation board circuit is designed to provi de the ds2782 with accurate parameter measurements. kit demonstration boards will vary as they are improved upon over time. for information on the demonstration board circuits refer to the indivi dual board datasheets lo cated online at www.maxim- ic.com. setup and installation board connections connections to the tssop demonstrati on board are best made either by so ldering directly to the pads or by using cables with mini-grabber clips. communicat ion to the tssop board can be accomplished either through the rj-11 jack by connecting the provided st andard six conductor rj-11 cord or by wiring directly to the sda, scl and p- pads . in the latter case, the size of th e board can be reduced by snapping off the rj-11 jack along the break line, see figure 1. to utilize the demonstration software, the sda, scl and pac- lines must be connected to the ds 9123o communication brick using either of the two methods described. figure 1: communication connections figures 2a and 2b show the recommended circuits to simulate charging and discharging. the lithium-ion cell is connected between the b+ and b- pads. the battery charger/power supply or circuit load is connected between the b+ and p- pads. the evaluation so ftware can be run in either configuration as long as a cell is connected between the b+ and b- termin als providing a minimum of 2.5 volts to power the ds2782. leaving the pio pin unconnected does not inte rfere with the operation of the demonstration board. refer to the datasheet for the operation of this pin. rj-11 break line p- b- sclb+ sda pio downloaded from: http:/// DS2782EVKIT+ 3 of 14 figure 2a: charging circuit fig 2b: discharging circuit software installation to install the ds2782 ev kit soft ware, exit all programs currentl y running and download the latest version at www.maxim-ic.com. unzip the compresse d file and double click the setup.exe icon to begin the installation process. follow the prompts to complete the installation. the ds2782 ev kit software can be uninstalled in the add/remove programs tool in the control panel. after the installation is complete, open the ds2782k folder and run ds 2782k.exe or select ds2782k from the program menu. a splash screen c ontaining information about the evaluation kit appears as the program is being loaded. selecting the communication port the first time the software runs, th e select preferences window may app ear. in this window, select either serial or usb communicati on and the port number; then hit ok. the ds2782 ev kit software saves this port selection and automatically uses the selection each time the program star ts. to change the port later, click the preferences option on the menu bar, select port settings, and then select the appropriate port. to attempt to automatically lo cate the ds9123o, click the poll serial ports button. warni ng - automatically polling for the ds9123o can disrupt other device s connected to your computers com ports. b+ p - battery + - DS2782EVKIT+ evaluation board sd a power supply / battery charger b- pio scl b+ p - battery + - DS2782EVKIT+ evaluation board scl b- pio load sd a downloaded from: http:/// DS2782EVKIT+ 4 of 14 program menus several pull down menu options have been provided to simplify use of the ds2782 ev kit software for the user. their functions are in dividually detailed below. file menu the file menu allows the user to store and recall information to and from a file directly into the text boxes on the parameters tab. these functions do not directly write or read the ds2782. it is still necessary for the user to store or recall this inform ation to or from the device by clicking on the write & copy or recall & read buttons on the parameters tab. registers menu the registers menu gives immediate access to all four status and functi on registers of the ds2782. selecting any of the registers will open an individua l control window giving the us er a description of each register bit and the ability to read or write it. see the status regi ster window example. status register the present state of all register bits are displayed immediatel y upon opening the register window. r/w locations contain a selection field or command button to allow the user to determine their state. pressing downloaded from: http:/// DS2782EVKIT+ 5 of 14 the write button will write the new value to the register and read th e corresponding register inside the ds2782 to verify the correct value was written. the c ontrol register is stored in eeprom, so when the write command is issued, the value is written and copied to eeprom without changing the values of the remainder of the parameter eeprom block. preferences menu the preferences menu allows the user to change co m port settings at any tim e. edit preferences opens the select preferences window. see se lecting the communication port above. help menu selecting the about topic from the help menu w ill open a window containing information about the current revision of this program and dallas semiconductor. program tabs all functions of the program are divided under four ta bs in the main program window. left click on the appropriate tab to move to the desired function page . located on the real time tab is all of the information measured and calculated by the ds2782. th at data is divided between the parametric data tab and fuel gauging tab. the parameters tab give s the user access to the entire parameter eeprom memory block in terms of applicati on units and device units . the memory tab disp lays the contents of every register and memory location inside the ds2782 an d allows the user to a lter the data. the data log tab allows the user to store all real time information to a file and view the data in a graphical form. real time tab the real time data is divided into two tabs: parametric data and fuel gauge data. the parametric data tab contains all of the real time measurements ta ken by the ds2782. the fuel gauge data contains all of the values calculated by the ds2782. downloaded from: http:/// DS2782EVKIT+ 6 of 14 parametric data tab the parametric data sub tab displays the latest real-time measurements of cell voltage, temperature, current and accumulated charge with both analog mete r readouts and digital valu es. the sense resistor value used to calculate the current reading is shown in the current section. go to the sense resistor value on the parameters tab to change this value the present states of pio pin is sh own at the bottom left of the window. there is also a button to toggle the state of the pio pin. set accumulated current register the user can bring up the set accumulated current re gister window by left clicking the set acr button. this window allows the user to enter a value fo r the accumulated curren t register in mah. downloaded from: http:/// DS2782EVKIT+ 7 of 14 set accumulation bias register the user can bring up the set accumulation bias re gister window by left clicking the set acc bias button. this window allows the user to enter values for the accumulation bias register in ma. the value entered here will be added to the accumulate d current register during ea ch current conversion. the bias value will not affect the current register reading, but will be reflected in the accumulated current register. update slave address when the ds2782 ev kit software st arts up, it will attempt to find the slave a ddress of the device connected to the ds9123o. if the device is not found at start up, the user can edit the slave address by left clicking on the update slave address button. if the user knows the slave address, simply enter the correct slave address in the text box and click the use this address button. if the slave address is unknown, clicking on the find sl ave address button will begin a sear ch of all addresses on the 2-wire bus. the slave address of the device can be changed by entering a new slave address in the text box and clicking the write slave address button. downloaded from: http:/// DS2782EVKIT+ 8 of 14 fuel gauge data tab the fuel gauge data sub tab displays the latest fu el gauge calculations. the full, active empty, and standby empty levels are calculated from the data input on the parameters tab. the remaining active absolute capacity (raac) and the remaining stand- by absolute capacity (rsac) are displayed in terms of mahrs. the remaining active relativ e capacity (rarc), remaining stand-by relative capacity (rsrc) are displayed in terms of percent of capacity remaining. the analog meter on the left displays the remaining active absolute capacity (raac). the flags found in the status register are displaye d on the right side of the window. when the under voltage flag or the power-on-reset flag is set, a butt on will appear that will allow the user to clear those bits. scalar register the user can bring up the set age s calar window by left clicking the u pdate button in the scalar area. this window allows the user to read and write the scalar value in terms of percent of the nominal capacity. downloaded from: http:/// DS2782EVKIT+ 9 of 14 parameters tab the parameters tab gives the user access to th e entire parameter eeprom memory block (block 1, addresses 60h-7fh) in terms of a pplication units and device units. th e application units tab displays the parameters in units like ma, mahrs, and volts . the device units tabs performs the calculations needed to get the application units into the units that are stored in the device like v, vhrs, and ppm as well as show the hexadecimal values that get written to the device. application units tab the application units sub tab allows the user to read and write the parameter eeprom memory block. to change any of this information, simply click on the desired text field and enter the new value. clicking on the load default set up button will enter example data into the information fields of the application units sub tab. once all data is in the desired format, click on the write & copy button to copy it to the eeprom of the ds2782. this information can also be stored to a file and r ecalled later using the load/s ave set up buttons or the load/save parameters set up menu items. these functions do not directly write or read the ds2782. it is still necessary for the user to st ore or recall this information to or from the device by issuing a write & copy or recall & read buttons. downloaded from: http:/// DS2782EVKIT+ 10 of 14 device units tab the device units sub tab is read-o nly. it displays the actual hexadecimal values read from the ds2782 and displays the units that are stored in the device. downloaded from: http:/// DS2782EVKIT+ 11 of 14 memory tab the memory tab gives the user access to all 32 byt es of sram and all 56 byt es of eeprom inside the ds2782. they are separated into 6 sub-tabs for conve nience. any value can be modified by clicking in that address text box and typing a new value in hexadecimal format . the write button will copy the entire block of data to the corresponding location inside the ds2782 (scratchpad ram on the eeprom blocks). the read button will update the entir e blocks text boxes with data from the ds2782 (scratchpad ram on the eeprom blocks). sub-tabs displaying any eeprom data will also have copy and recall buttons to allow the user to transfer the data between scratchpad and eeprom memory internal to the ds2782. the permanently lock bloc k 0/1 buttons will perman ently store the data currently located in that blocks eeprom. warning C this data can never be cha nged once locked. verify your data first by issuing a recall and a read. downloaded from: http:/// DS2782EVKIT+ 12 of 14 log data tab the log data tab allows the user to see the ds2782 s real time measurements graphed over time. there are separate sub-tabs for voltage, current, temperature, and accumulate d charge. each graph displays the last 500 data points collected by the ds2782 ev kit software. the sampling interval can be adjusted from as fast as possible to 15 minutes and can be adjust ed from the sampling interv al menu at the bottom of the window. the clear graphs button will clear all data fr om all four graphs, but does not reset the log to file function. when the fastest sampling interval is selected, the graphs will not be updated, only the data logging is enabled. the log to file sub tab contains control information for storing all data to an ascii file. the default filename is c:\ds2782k_datal og.txt, but can be modified in the filename text field. the log data button toggles data logging off and on. data will be stored at the same interv al selected for updating the graphs in the tab-delimited format of time DS2782EVKIT+ 13 of 14 downloaded from: http:/// DS2782EVKIT+ 14 of 14 revision history revision date description pages changed 9/09 changed the part number from ds2782k to DS2782EVKIT+. all downloaded from: http:/// |
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