#Denotes a RoHS-compliant device that may include lead(Pb) that
is exempt under the RoHS requirements.
1-Wire is a registered trademark of Maxim Integrated Products, Inc.
DS2480B
5
2
1
6
5
4 1-W
3 GND
2
1
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DS9097U
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 RJ11 port. The DB9 version
reads and writes any non-EPROM 1-Wire device. To write to EPROM devices, the DB25 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 serial 1-Wire line driver chip. The RXD/TXD polarity select input
of the DS2480B is connected to V
DD
(noninverting).
Free software drivers can be downloaded from
www.maxim-ic.com/1-Wiredrivers.
The DS9097U communicates with 1-Wire devices at standard speed as well as overdrive 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 19200bps, 57600bps, and 115200bps. The two higher rates are recommended 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 DB9 versions of this adapter do
not work with such ports. The DS9097U-E25 adapter, however, functions 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-E25
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.
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DS9097U
REVISION HISTORY
REVISION
DATE
9/00
2/04
8/09
6/11
DESCRIPTION
Initial release
Updated for change in plastic body style; added note that the color of the plastic
body may vary
Added the # sign to all the part numbers in the
Ordering Information
table;
added the
Revision History
table
Deleted references to Crypto devices, TMEX, DS9097, and DS9097E; added
reference to the
Connectivity Matrix
table in the DS1402x 1-Wire network cables
data sheet; updated the URL for software drivers download
PAGES
CHANGED
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1
1, 3
1, 2
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Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied. Maxim
reserves the right to change the circuitry and specifications without notice at any time.
M a x i m I n t e g r a t e d P r o d u c t s , 1 2 0 S a n G a b r i e l D r iv e , S u n n y v a le , C A 9 4 0 8 6 4 0 8- 7 3 7 - 7 6 0 0
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