1 of 6 features ? demonstrates the capabilities of the ds2502 1kb add-only memory including: ? identification ? eprom memory ? interfaces to the usb port of a pc running a windows xp? operating system or older index evaluation kit contents equipment needed introduction setup and installation board connections software installation selecting the com port program menus menu windows program tabs rom codes tab memory tab evaluation kit contents 1 pc. evaluation board 1 pc. ds9123o usb port adapter 1 pc. rj-11 cable equipment needed 1. a pc running windows xp operating system or older and an available serial port. 2. cables with mini-grabbe r style clips or the ability to solder direct ly to connection pads. 3. a lithium-ion (li+) battery and a power supply and/or load circuit. ordering information part type DS2502EVKIT+ ev kit + denotes lead(pb)-free and rohs compliant . introduction the ds2502 evaluation kit (ev kit) makes perf ormance evaluation, software development, and prototyping with the ds2502 1kb add-only memory easy. the evaluation board interfaces to a pc through a ds9123o usb adapter and rj-11 cable connection. separate control tabs allow the user access all ds2502s that are connected to the 1-wire? bus and access all memory locations of those devices. kit demonstration boards will vary as they are improved upon over time. DS2502EVKIT+ 1kb add-only memory evaluation kit www.maxim-ic.com windows xp is a registered trademark of microsoft corp. 1-wire is a registered trademark of maxim integrated products, inc. downloaded from: http:///
DS2502EVKIT+ 2 of 6 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 pr ovided standard six conductor rj-11 cord. a battery should be connected between the vdd (pos itive terminal) and vss (n egative terminal) and provide enough voltage to power the ds2502. in order to program th e device, a 12 volt programming voltage should be connect ed between vpp and vss. figure 1: connecting the ds2502 evaluation kit software installation to install the ds2502 ev kit software , download the latest version at www.maxim-ic.com . unzip the compressed file and double-click th e setup.exe icon to begin the in stallation process. follow the prompts to complete the installati on. the ds2502 ev kit software can be uninstalled in the add/remove programs tool in the control panel. after the installation is complete , open the ds2502k folder and run ds2502k.exe or select ds2502k from the program menu. a splash screen containing information about the evaluation kit appears as the program is being loaded. selecting the communication port the first time the software runs, the select preferences window may appear. in th is window, select either serial port or usb communication and the port number; then hit ok. the ds2502 ev kit software saves this port selection and automatically uses the selection each time the program starts. to change the port later, click the preferences option on the menu bar, sele ct port settings, and then select the appropriate port. to attempt to automatically lo cate the ds9123, click the poll ports button. warning: automatically polling for the ds9123 can disrupt other devices connected to your computer?s com ports . vpp vdd battery + - ds2502 evaluation board 12- v power supply vss downloaded from: http:///
DS2502EVKIT+ 3 of 6 program menus several pull down menu options have been provided to simplify use of the ds2502 ev kit software for the user. their functions are in dividually detailed below. file menu the file menu allows the user to save or load all of the data in the text boxes on the memory tab. selecting the load setup does not wr ite the ds2502, but rather it loads th e values into the text boxes. the user must still click the write button in order to write the device. 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 maxim. downloaded from: http:///
DS2502EVKIT+ 4 of 6 program tabs all functions of the program are divided under two ta bs in the main program window. left click on the appropriate tab to move to the desired function page. located on the ro m codes tab are the rom codes of all the ds2502s that are found on the 1-wire bus. the memory tab displays the contents of all of the memory locations inside the ds2502 and allows the user to alter the data. rom codes tab the rom codes tab displays the rom codes of all the ds2502s that are found on the 1-wire bus. the user can refresh the list of rom codes by left -clicking on the find ds2502 rom codes button. this will initiate a search rom sequence to find all of the 1-wire devices with the family code of the ds2502. downloaded from: http:///
DS2502EVKIT+ 5 of 6 memory tab the memory tab gives the user access to read the c ontents of all of the memory inside the ds2502. left- clicking the write page x or read page x buttons will access the device for the specific page that is displayed. left-clicking on the read all pages or wr ite all pages will access pages 0-3 and the status registers. when the user writes to the device, the software will determine if the data was correctly written to the device by checking the crc byte. once the crc byte has been verified, the software will enable a programming pulse to program the da ta into the eprom of the device. a 12 volt programming voltage is requi red on the vpp terminal of the ds 2502 ev kit in order to write to the device. if the programming voltage is not present, an error message will be displayed and the memory will not be updated. downloaded from: http:///
DS2502EVKIT+ 6 of 6 maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a maxim product. no circu it patent licenses are implied. maxim reserves the right to change the ci rcuitry and specifications wi thout notice at any time. maxim integrated products, 120 san gabriel drive, sunnyvale, ca 94086 408-737-7600 ? 2009 maxim integrated products maxim is a registered tra demark of maxim integrated products. revision history revision date description pages changed 8/09 changed the ordering part number from ds2502k to DS2502EVKIT+. all downloaded from: http:///
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