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Technical content

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

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 6 4 RTS DTR RXD TXD GND RS-232 COM PORT REG DS2480B RJ11 1-W GND ID CHIP DS9097U-009 ONLY DB25 VERSION 6 4 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 P roducts, Inc. 19-4874; Rev 6/11

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 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 serial 1-Wire line driver chip. The RXD/TXD polarity select input of the DS2480B is connected to VDD (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 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 19200bps, 57600bps, and 115200bps. The two higher rates are r ecommended 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-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.

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. Maxim 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

9/00 Initial release — 2/04 Updated for change in plastic 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 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