19-4874; Rev 6/11 DS9097U Universal 1-Wire COM Port Adapter FEATURES PACKAGE OUTLINE 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) DB9 VERSION RJ11 PIN 1 SIDE VIEW DB25 VERSION RJ11 PIN 1 2.1mm POWER JACK - CONTACT + CONTACT SIDE VIEW 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), PCGround (7); all other pins not connected REAR VIEW REAR VIEW SCHEMATIC (FOR ILLUSTRATION) DB9 VERSION RS-232 COM PORT 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. 9289895, Stancor Model STA-300R, or equivalent). Note 2: The color of the DS9097U plastic case can vary. RTS DTR RXD TXD GND DS9097U-009 ONLY 5V REG 4 8 ID CHIP DS2480B 5 7 2 ORDERING INFORMATION PART DS9097U-009# DS9097U-S09# DS9097U-E25# 6 RJ11 6 5 4 1-W 3 GND 2 1 1 TYPE DB9, with DS2502 ID chip DB9, no ID chip DB25, with EPROM write DB25 VERSION POWER JACK RS-232 COM PORT #Denotes a RoHS-compliant device that may include lead(Pb) that is exempt under the RoHS requirements. RTS DTR RXD TXD GND 1-Wire is a registered trademark of Maxim Integrated Products, Inc. RJ-11 5V REG 8 9V 4 6 DS2480B 5 7 2 1 1 of 3 6 5 4 1-W 3 GND 2 1 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 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 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. 2 of 3 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 — 1 1, 3 1, 2 3 of 3 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 © 2011 Maxim Integrated Products Maxim is a registered trademark of Maxim Integrated Products, Inc.