1 of 3 features ? true - ground interface to an rs - 232 com port for reading and writing 1 - wire ? devices ? works with bipolar as well as unipolar logic signals ? compatible to com port of ()5v to ()12v (db 9 version only) or ()6v to ()12v (db 25 ve rsion) ? supports reading and writing at standa rd and overdrive speeds ? provides strong pullup to 5v for tempera ture and eeprom 1 - wire d evices ? programs 1 - wire eprom devices (db-25 version with external 12v power supply only) ? communicates at data rates of 9.6 kbps (default), 19.2 kbps , 57.6 kbps , and 115.2kbps ? standard db 9 or db 25 female connector and 6 -l ead rj 11 connector for easy attach ment of standard 1 - wire cables and probes ? includes ds2502 identification chip (ds9097u -009 o nly) pin assignment db9: txd (3), rxd (2), dtr (4), rts (7), pc - ground (5); all other pins not connected db25: txd (2), rxd (3), dtr (20), rts (4), pc - ground (7); all oth er pins not connected note 1: the external supply for the ds9097u - e25 must provide well - regulated 12v at 10ma minimum, center = gnd, outer ring = v+ (newark electronics stock no. 84f2081, allied electronics stock no. 928- 9895, stancor model sta - 300r, or equivalent) . note 2: the color of the ds9097u plastic case can vary. ordering information part type ds9097u - 009# db9, with ds2502 id c hip ds9097u - s09# db9, no id chip ds9097u - e25# db25, with eprom w rite # denotes a rohs - compliant device that may include lead(pb) that is exempt under the rohs requirements. package outline db 9 version side view rear view rj11 pin 1 db 25 versi on rj11 pin 1 side view rear view + contact - contact 2.1mm power jack schematic (for illustration) db 9 version 6 4 rts dtr rxd txd gnd rs - 232 com port 5v reg ds2480b 1 7 8 5 2 rj 11 1 - w gnd 6 5 4 3 2 1 id chip ds9097u - 009 only db 25 version 6 4 rts dtr rxd txd gnd rs - 232 com port 5v reg ds2480b 1 7 8 5 2 rj - 11 1 - w gnd 6 5 4 3 2 1 power jack 9v ds9097u universal 1 - wire com port adapter 1 - wire is a registered trademark of maxim integrated p roducts, inc. 19 - 4874; rev 6/11
ds9097u 2 of 3 description the ds9097u is a sophisticated rs - 232 to 1- wire adapter, which performs rs - 232 level conversion and actively generates the 1 - wire communication signals. together with an adequate software driver, it enables a windows ? - based pc to directly communicate with any 1 - wire device connected to the adapter ? s rj 11 port. the db 9 vers ion reads and writes any non - eprom 1 - wire device. to write to eprom devices, the db 25 version with external power supply is required. for a list of suitable 1 - wire network cables, refer to the connectivity matrix table in the ds1402x 1 - wire network cables data sheet. all ds9097u adapters are based on the ds2480b s erial 1 - wire l ine d river chip . the rxd/txd p olarity s elect input of the ds2480b is connected to v dd (non inverting) . free software drivers can be downloaded from www.maxim - ic.com/1 - wiredrivers . the ds9097u communicates with 1 - wire devices a t standard speed as well as o verdrive speed. the serial port must support a data transmission rate of 9600bps. under software control, the adapter can be set up for rs - 232 data rates of 19200 bps , 57600 bps , and 115200bps. the two higher rates are r ec ommended for communication at overdrive speed with overdrive - capable devices. since the ds9097u operates in a byte mode, every data byte received from the rs - 232 port generates eight time slots on the 1- wire line. note that there are some com ports that use signal levels of less than ( ) 5v. the db 9 versions of this adapter do not work with such ports. the ds9097u - e25 adapter, however, function s in most cases if external power is supplied. without eprom programming, the external power can be anywhere in the range of 6v to 9v. for eprom programming the voltage must be at 12v in any case. before using an externally powered ds9097u -e2 5 with a com port of less than ( ) 5v , check whether the com port will not be damaged by 5v on its rxd input. windows is a registered trademark of microsoft corp.
ds9097u 3 of 3 maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a maxim product. no cir cuit patent licenses are implied. max im reserves the right to change the circuitry and specifications without notice at any time. maxim integrated products, 120 san gabriel drive, sunnyvale, ca 94086 408 - 737 - 7600 ? 2011 maxim integrated products maxim is a registered trademark of maxim integrated products, inc. revision history revision date description pages changed 9/00 initial release ? 2/04 updated for change in p lastic body style; added note that the color of the plastic body may vary 1 8/09 added the # sign to all the part numbers in the ordering information table ; added the revision history table 1 , 3 6/11 deleted references to crypto devices , tmex , ds9097, a nd ds9097e ; added reference to the connectivity matrix table in the ds1402 x 1 - wire network cables data sheet; updated the url for software drivers download 1, 2
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