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general description the ds2484 evaluation system (ev system) consists of a ds2484 evaluation kit (ev kit) and a ds9400 usb-to-i 2 c adapter. the ds2484 is an i 2 c-to-1-wire ? bridge device that performs protocol conversion from an i 2 c master to any attached 1-wire slave devices. relative to any attached 1-wire slave device, the ds2484 is a 1-wire master. the evaluation software runs under a windows ? 7, windows 8, or windows xp ? operating system (os), providing a handy user interface to exercise the features of the ds2484. order the DS2484EVKIT# for the complete ev system to evaluate the ds2484 using a pc. evaluation software for the ev system is also available on our website at: www.maximintegrated.com/evkit . features i 2 c host interface supports 100khz and 400khz i 2 c communication speeds i 2 c operating voltages: 1.8v 5% and 3.3v 5% 1-wire operating voltage: 1.8v 5% and 3.3v 5% ev kit contains a mounted 6-pin sot23 ds2484r+t ic convenient on-board test points and to-92 socket standard rj11 connector interfaces to ds9120 socket boards downloadable evaluation software 19-6892; rev 0; 1/14 ordering information appears at end of data sheet. windows and windows xp are registered trademarks and registered service marks of microsoft corporation. 1-wire is a registered trademark of maxim integrated products, inc. qty description 1 ds2484 evaluation board 1 ds9400 usb-to-i 2 c adapter maxim ds9400# qty description 1 usb type a to usb-mini type b cable qualtek 3021003-03 1 1024-bit 1-wire eeprom (3 to-92) maxim ds2431+ ev system contents ds2484 evaluation kit board evaluates: ds2484 ds2484 evaluation system
maxim integrated 2 quick start recommended equipment maxim ds9400 ev kit (included) ds2484 ev kit (included) usb type a to usb-mini type b cable (included) ds2431+ (included) pc with a windows 7, windows, 8, windows vista ? , or windows xp os and a spare usb port note: in the following sections, software-related items are identified by bolding. text in bold refers to items directly from the ev kit software. text in bold and underlined refers to items from the windows os. procedure 1) a) do the following to install pl-2303 prolific driver: download the driver file called pl2303_prolific_ driverinstaller_1_9_0.zip or newer from http:// prolificusa.com/pl-2303hx-drivers. open and run the file with the name or newer version pl2303_prolific_driverinstaller_ v1417.exe . b) follow the directions of the install wizard until finish is reached of the pl-2303 usb-to-serial driver install. close by clicking the finish button. 2) the ds9400 usb-to-i 2 c adapter uses both the prolific pl-2303hxd and a microcontroller to provide an i 2 c port on any computer. verify correct installation of the virtual com port by inserting the ds9400 into a spare usb port on the computer. check the com port by looking in control panel | system | device manager and expand ports (com & lpt) . if the driver installed correctly, the driver should display as in the example shown in figure 1 . note that your com port number may be different. you have now completed the installation of the ds9400 adapter. 3) proceed now by setting up the ds2484 ev kit hard - ware by doing the following: a) set the jumpers per figure 16 for 3.3v operation for both the i 2 c i/ f and 1-wire. b) insert the ds2431 device into j1 of the ds2484 ev kit. windows vista is a registered trademark and registered service markof microsoft corp. ds2484 evaluation system www.maximintegrated.com evaluates: ds2484 ds2484 evaluation system
maxim integrated 3 c) plug the j2 of the ds9400 adapter into j2 of the ds2484 ev kit. 4) now download the ds2484 evkit software from www.maximintegrated.com/evkit . 5) unzip the ds2484 evkit.zip in a known location. 6) open the ds2484 evkit folder and double-click the setup.exe . if you encounter the dialog box shown in figure 2 , click the cancel button. when prompted by the window as shown in figure 3 , click install. 7) the ds2484 ev kit software detects if the pc has the required .net framework 2.0 files. if the files do not exist, the program prompts to download them from the web. otherwise, the program will install and display the ds2484 evkit main page ( figure 4). figure 1. ds9400 com port figure 2. program compatibility assistant www.maximintegrated.com evaluates: ds2484 ds2484 evaluation system
maxim integrated 4 figure 3. application install C security warning www.maximintegrated.com evaluates: ds2484 ds2484 evaluation system
maxim integrated 5 detailed description of software figure 4 shows the evaluation softwares main window. this window consists of three main tabs: ds2484 , 1-wire sequences, and error log . the i2c data log and the 1-wire data log group boxes are shown regardless of which tab is selected and display communication activity. these two group boxes assist the engineer in becoming familiar with what command sequences the ds2484 device needs in order to function. a mini tool bar provides additional functionality for both the software and the ds2484 device. figure 4. ds2484 evkit main window www.maximintegrated.com evaluates: ds2484 ds2484 evaluation system
maxim integrated 6 viewer window areas ds2484 tab the 1-wire commands group box ( figure 5 ) allows the user to send 1-wire commands to any 1-wire slave device. the following features are supported in the 1-wire commands group box: ? reset: this sends a 1-wire reset command on the 1-wire bus. ? write byte(s): writes any number of 1-wire bytes on the 1-wire bus up to 16,382 bytes (no spaces or commas). ? read byte(s): reads any number of 1-wire time-slot bytes on the 1-wire bus up to 32,768 bytes. ? write bit: writes a 1-wire single bit with a value of 0 or 1 dependent on if logic 1 or logic 0 is selected to the 1-wire bus. ? triplets: writes a single triplet with a branch direction of 0 or 1 dependent on if direction 1 or direction 0 is selected to the 1-wire bus. this function assists in performing a search rom function on a 1-wire bus. figure 5. 1-wire commands group box www.maximintegrated.com evaluates: ds2484 ds2484 evaluation system
maxim integrated 7 the status register group box ( figure 6 ) provides access to the ds2484s status register bits. a read performs a read of the status register bits by the i 2 c interface. this is a read-only register. the software application automatically updates the contents when a command alters any of the bits in the status register group box. figure 6. status register group box www.maximintegrated.com evaluates: ds2484 ds2484 evaluation system
maxim integrated 8 the device configuration group box (figure 7) provides access to the ds2484s configuration register bits. a read performs a read of the device configuration register bits. the upper nibble always reads 0h. click on the header bit label to toggle the particular bit. when writing to the device configuration register, the new data is accepted only if the upper nibble (bits 7:4) is the ones complement of the lower nibble (bits 3:0). therefore, when a bit on the lower nibble is selected, the upper nibble bit with the same label and invert symbol (!) automatically shows as the ones complement. however, when reading the register, the upper nibble reads 0h. figure 7. device configuration group box www.maximintegrated.com evaluates: ds2484 ds2484 evaluation system
maxim integrated 9 1-wire sequences tab the single slave group box ( figure 8 ) allows the user to send 1-wire command sequences to any 1-wire slave device. using these commands with multiple slaves on the line may cause data corruption (logical anding of bits). the following features are supported in the single slave group box: ? read rom: sends a 1-wire reset command, read rom (33h) command followed by reading 8 bytes on the 1-wire bus. the rom id is then displayed and the crc is verified. ? skip rom: sends a 1-wire reset command followed by a skip rom (cch) command on the 1-wire bus. this is used to select a single 1-wire slave device. ? od skip rom: sends a 1-wire reset command fol - lowed by an od skip rom (3ch) command on the wire bus. this is used to place a single or all the 1-wire slave devices on the 1-wire bus into overdrive mode. figure 8. single slave group box www.maximintegrated.com evaluates: ds2484 ds2484 evaluation system
maxim integrated 10 the multiple sla ves group box (figure 9 ) allows the user to send 1-wire command sequences to any 1-wire slave device. the following features are supported in the multiple slaves group box: ? search rom (first): uses the search rom com - mand (f0h) to perform the first sequence of the 1-wire search rom algorithm to discover the first 1-wire slave device on the 1-wire bus. the first rom id is displayed in the device list . refer to application note 187: 1-wire search algorithm for more details. ? search rom (next): also uses the search rom com - mand (f0h) in a sequence as to continue the 1-wire search rom algorithm where the last binary search left off to discover the next 1-wire slave device rom id. ? match rom: sends the 1-wire reset command, fol - lowed by the match rom command (55h), followed by the rom id selected from the device list . if no 1-wire slave device is selected in the device list or none is available to select, an ! is displayed, indicat - ing a warning that no device has been selected. ? od match rom: sends the 1-wire reset command, followed by the match rom command (69h), followed by the rom id selected from the device list . if no 1-wire slave device is selected in the device list or none is available to select, an ! is displayed indicating a warning that no device has been selected. this places the selected 1-wire slave device into overdrive mode. ? resume rom: sends a 1-wire reset command fol - lowed by the resume command (a5h). ? find all devices: performs the entire search rom algorithm sequence, and all the 1-wire slave rom ids discovered are displayed in the device list. ? clear device list: removes all 1-wire slave devices listed in the device list. log group boxes the log group boxes provide all the outputs of the i 2 c bus and the 1-wire bus. these logs can each be highlighted and copied to the clipboard for pasting into any windows program. the i2c data log (figure 10 ) allows the user to view all the i 2 c traffic transmitted and received from the i 2 c bus. this can assist the designer determining what i 2 c command sequences are needed to exercise the ds2484 device. the i2c data log displays the characters shown in table 1 . www.maximintegrated.com evaluates: ds2484 ds2484 evaluation system
maxim integrated 11 figure 9. multiple slaves group box table 1. i 2 c communication key key function s - start i 2 c start command represented by a single s in a line. sr - repeated start i 2 c repeated start command represented by sr in a line. p - stop i 2 c stop command represented by a single p in a line. hh - write to device (hex) i 2 c write from master to device represented by a pair of hex digits showing the byte that was transmitted. [hh] - read from device with ack (hex) i 2 c read from device represented by a pair of hex digits bounded by brackets [ ] showing that the byte that was received. this byte was acked by the master. [hh*] - read from device with nack (hex) i 2 c read from device represented by a pair of hex digits and an asterisk * bounded by brackets [ ] showing the byte that was received. this byte was nacked by the master indicated that the master is done reading. www.maximintegrated.com evaluates: ds2484 ds2484 evaluation system
maxim integrated 12 the 1-wire data log group box ( figure 11 ) allows the user to view all the 1-wire traffic transmitted and received from the 1-wire bus. this can assist the designer in determining what 1-wire command sequences are needed to exercise the ds2484 device and 1-wire slave devices. the 1-wire data log displays the characters shown in table 2 . figure 10. i2c data log group box www.maximintegrated.com evaluates: ds2484 ds2484 evaluation system
maxim integrated 13 table 2. 1-wire communication key figure 11. 1-wire data log group box key function rp - reset + presence 1-wire reset and presence pulse response. rn - reset + no presence 1-wire reset and no presence pulse response. hh - write to device (hex) 1-wire write from master to device represented by a pair of hex digits showing the byte that was transmitted. [hh] - read from device (hex) 1-wire read from device represented by a pair of hex digits bounded by brackets [ ] showing the byte that was received. 1b/0b - write to device (binary) 1-wire write bit from master to device represented by a single binary digit (1/0). [1b]/[0b] - read from device (binary) 1-wire read bit from master to device represented by a single binary digit (1/0) bounded by brackets [ ] showing the bit that was received. www.maximintegrated.com evaluates: ds2484 ds2484 evaluation system
maxim integrated 14 the error log tab (figure 12 ) allows the user to view any unhandled software exceptions. this error would display when the user does something that is outside the bounds of normal operation for the software and the software has no way to handle the specific event. the exception as shown in figure 12 was due to the user entering a value larger than what the read byte command could handle. figure 12. error log tab www.maximintegrated.com evaluates: ds2484 ds2484 evaluation system
maxim integrated 15 mini tool bar the mini tool bar icon short descriptions are provided in figure 13 . the following is the long description of each icon: ? device reset: causes the ds2484 to perform an internal reset cycle caused from executing the device reset command followed by a read of the device configuration register. ? change i2c speed: allows the i 2 c bus to run at the selected frequency of 100khz or 400khz. the selec - tion only affects the microcontroller. the ds2484 does not have to be configured for speed. ? change 1-wire timing: provides reading of the port configuration register and writing of the adjust 1-wire port. the window is shown in figure 14 . adjustment to any timing parameter shown is done by selecting the timing parameter and speed , adjusting the slider symbol,and clicking on the write button. verification of the write can be done by clicking on the read button. exit by clicking on the close button. ? data log options: allows selecting to turn on/off the 1-wire data log or i2c data log . ? clear data logs: clears all data log group boxes. viewer menu the viewer menu consists only of file with the only option in the drop-down menu to exit. exit closes the program. the program also ends by the keyboard keys ( alt + f) and then (x). detailed description of connectors/ jumpers rj11 pinout the rj11 pinout mounted on the ev kit pcb at rj1 is shown in table 3 and figure 15 . rj11 pin 1 can supply 3.3v or 1.8v and can be used for auxiliary board power. gnd is ground of the 3.3v or 1.8v supply, depending on jumper settings. the signal 1-wire stands for the one- wire data bus. the ground return 1-wire is the signal gnd_rtn. pins 5 and 6 marked as nc are not connected. figure 13. mini tool bar figure 15. 1-wire rj11 port figure 14. port configuration register table 3. 1-wire rj11 pinout connector pin # signal name 1 vcc 2 gnd 3 1-wire 4 gnd_rtn 5 nc 6 nc 6 looking into female rj11 connector 5 4 3 2 1 www.maximintegrated.com evaluates: ds2484 ds2484 evaluation system
maxim integrated 16 j2 pinout the 4-position 100-mil-spaced i 2 c i/f connector is mounted at j2 of the ev kit pcb, as shown in table 4 . these signals are routed to u2 of the max3394e ic that is used as a dual-level translator to allow either 1.8v or 3.3v i 2 c signals to u3 of the ds2484 ic. j2 of the ev kit can be connected to j2 of the ds9400 for a complete ev system. the sda_port signal is the i 2 c serial-data input/output port and the sdc_port is the i 2 c serial- clock input port. jumper settings the ev kit has three jumpers that are needed to select power-supply inputs for the ds2484 ic. figure 16 to figure 19 show the most common power-supply input selections for the ds2484 device. table 4. i 2 c i/f pinout figure 16. 3.3v operation for both the i 2 c and 1-wire interfaces figure 18. 1.8v i 2 c i/f and 1.8v 1-wire figure 19. powered down (sleep mode) figure 17. 1.8v i 2 c i/f and 3.3v 1-wire connector pin # signal name 1 vcc3.3 2 sda_port 3 gnd 4 scl_port jp1 3.3v vi2c jp2 vi2c gnd slpz jp3 3.3v vi2c vcc 1.8v jp1 3.3v vi2c jp2 vi2c gnd slpz jp3 3.3v vi2c vcc 1.8v jp1 3.3v vi2c jp2 vi2c gnd slpz jp3 3.3v vi2c vcc 1.8v jp1 3.3v vi2c jp2 vi2c gnd slpz jp3 3.3v vi2c vcc 1.8v www.maximintegrated.com evaluates: ds2484 ds2484 evaluation system
maxim integrated 17 v c c 3.3 sd a_por t sc l_ por t 1 2 3 4 j2 i2c por t sh dn 3 out 5 gnd 2 in 1 4 u1 ma x8 891 slpz 1 gnd 4 sd a 2 sc l 3 io 5 v c c 6 u3 ds2484 v c c 3.3 v c c 1.8 gnd v c c 3.3 v c i2c v c i2c slpz v c i2c v c c 3.3 1 2 3 jp1 r1 3.3k/0603 r2 3.3k/0603 1 2 3 j1 t o-92 so c k e t gnd_rt n gnd_rt n 1-wire io r3 3.3 ohm r4 3.3 ohm gnd 1 2 3 4 5 6 r j1 r j11 c 1 1uf c 2 1uf 1-w ir e 1 2 3 jp2 1 2 3 jp3 c 3 0.1uf gnd_rt n c 4 0.1uf gnd v c c gnd t p4 1-w ir e sd a sc l t p6 sc l t p3 sd a t p7 gnd_rt n t p2 v c c 3.3 t p5 slpz t p1 gnd gnd v c c 1 en ab le 2 i/ o vcc 1 3 i/ o vcc 2 4 gnd 5 i/ o vl2 6 i/ o vl1 7 v l 8 ep ep u2 ma x3 394 v c c 1 io 1 3 io 2 4 gnd 6 u4 ma x1 3202 gnd c 5 0.1uf v c c v c c gnd gnd designation qty description c1, c2 2 1f 10%, 10v ceramic capacitors (0603) tdk corporation c1608x5r1a105k c3Cc5 3 0.1f 10%, 16v x7r ceramic capacitors (0603) kemet c0603c104k4ractu j1 1 3-position connector socket strip lopro samtec ssa-132-s-g j2 1 4-pin 100-mil female connector samtec ssq-104-02-t-s-ra jp1, jp2, jp3 3 0.100, 3-position vertical 0.318 breakaway headers tyco electronics 9-146276-0 r1, r2 2 3.3k? 1% resistors (0603) yageo rc0603fr-073k3l r3, r4 2 5.11? 1% resistors (0603) panasonic erj-8geyj5r1v designation qty description rj1 1 connector mod jack, 6-6 pcb 50au tyco electronics 5555165-1 tp1Ctp7 7 test points keystone electronics 5011 u1 1 high psrr, low-dropout, 150ma linear regulator (5 sc70) maxim max8891exk18+ u2 1 dual-channel level translator (8 tdfn-ep*) maxim max3394eeta+t u3 1 i 2 c-to1-wire master (6 sot23) maxim ds2484r+t u4 1 2-/4-/6-/8-channel 30kv esd protectors (6/8/10 dfn) maxim max13202 3 lp with handle, 2-position shunt, 30au te connectivity 881545-2 1 pcb: ds2484 evkit rev a figure 20. ds2484 ev kit schematic component list www.maximintegrated.com evaluates: ds2484 ds2484 evaluation system
maxim integrated 18 figure 21. ds2484 ev kit composite layout www.maximintegrated.com evaluates: ds2484 ds2484 evaluation system
maxim integrated 19 #denotes rohs compliant. part type DS2484EVKIT# ev system ordering information www.maximintegrated.com evaluates: ds2484 ds2484 evaluation system
? 2014 maxim integrated products, inc. 20 revision number revision date description pages changed 0 1/14 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: ds2484 ds2484 evaluation system 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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