DS9097U-009# Datasheet DS9097U-S09#, DS9097U-009#, DS9097U-E25# | P1-P3

AVAILABLE

Functional Diagrams

Pin Configurations appear at end of data sheet.

Functional Diagrams continued at end of data sheet.

UCSP is a trademark of Maxim Integrated Products, Inc.

For pricing, delivery, and

ordering information, please contact Maxim Direct

at 1-888-629-4642, or visit Maxim’s website at www.maximintegrated.com.

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

(DB9 Version Only) or (±)6V to (±)12V (DB25

Version)

 Supports Reading and Writing at Standard and

Overdrive Speeds

 Provides Strong Pullup to 5V for Temperature

and EEPROM 1-Wire Devices

 Programs 1-Wire EPROM Devices (DB-25

Version with External 12V Power Supply Only)

 Communicates at Data Rates of 9.6kbps

(default), 19.2kbps, 57.6kbps, and 115.2kbps

 Standard DB9 or DB25 Female Connector and

6-Lead RJ11 Connector for Easy Attachment

of Standard 1-Wire Cables and Probes

 Includes DS2502 Identification Chip

(DS9097U-009 Only)

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 other 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 chip

DS9097U-S09#

DB9, no ID chip

DS9097U-E25#

DB25, with EPROM write

#Denotes a RoHS-compliant device that may include lead(Pb) that

is exempt under the RoHS requirements.

PACKAGE OUTLINE

DB9 VERSION

SIDE VIEW

REAR VIEW

RJ11 PIN 1

DB25 VERSION

RJ11 PIN 1

SIDE VIEW

REAR VIEW

+ CONTACT

- CONTACT

2.1mm

POWER JACK

SCHEMATIC (FOR ILLUSTRATION)

DB9 VERSION

RTS

DTR

RXD

TXD

GND

RS-232

COM PORT

REG

DS2480B

RJ11

1-W

GND

CHIP

DS9097U-009

ONLY

DB25 VERSION

RTS

DTR

RXD

TXD

GND

RS-232

COM PORT

REG

DS2480B

RJ-11

1-W

GND

POWER JACK

DS9097U

Universal 1-

Wire COM Port Adapter

1-Wire is a registered trademark of Maxim Integrated Products, 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 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

(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.

DS9097U

REVISION HISTORY

REVISION

DATE

DESCRIPTION

PAGES

CHANGED

9/00 Initial release —

2/04

Updated for change in plastic body style; added note that the color of the plastic

body may vary

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, 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

1, 2

Maxim Integrated 160 Rio Robles, San Jose, CA 95134 USA 1-408-601-1000

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. The parametric values (min and max limits) shown in the Electrical

Characteristics table are guaranteed. Other parametric values quoted in this data sheet are provided for guidance.

2011 Maxim Integrated

The Maxim logo and Maxim Integrated are trademarks of Maxim Integrated Products, Inc.

P1-P3

DS9097U-009#

Mfr. #:

Buy DS9097U-009#

Manufacturer:

Maxim Integrated

Description:

iButtons & Accessories Universal 1-Wire COM Port Adapter

Lifecycle:

New from this manufacturer.

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DS9097U-009#

DS9097U-009#

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