DS9097U Universal 1-Wire COM Port Adapter FEATURES PACKAGE OUTLINE True-Ground Interface to an RS-232 COM Port DB9 VERSION for Reading and Writing 1-Wire Devices RJ11 PIN 1 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 SIDE VIEW REAR VIEW Overdrive Speeds Provides Strong Pullup to 5V for Temperature DB25 VERSION and EEPROM 1-Wire Devices RJ11 PIN 1 Programs 1-Wire EPROM Devices (DB-25 Version with External 12V Power Supply Only) Communicates at Data Rates of 9.6kbps 2.1mm (default), 19.2kbps, 57.6kbps, and 115.2kbps POWER JACK Standard DB9 or DB25 Female Connector and 6-Lead RJ11 Connector for Easy Attachment - CONTACT of Standard 1-Wire Cables and Probes Includes DS2502 Identification Chip + CONTACT (DS9097U-009 Only) SIDE VIEW REAR VIEW PIN ASSIGNMENT DB9: TXD (3), RXD (2), DTR (4), RTS (7), PC-Ground (5) all other pins not connected SCHEMATIC (FOR ILLUSTRATION) DB25: TXD (2), RXD (3), DTR (20), RTS (4), PC- DB9 VERSION Ground (7) all other pins not connected RS-232 DS9097U-009 RJ11 COM PORT ONLY Note 1: The external supply for the DS9097U-E25 Functional Diagrams 5V must provide well-regulated 12V at 10mA minimum, 6 RTS REG center = GND, outer ring = V+ (Newark Electronics 5 DTR Stock No. 84F2081, Allied Electronics Stock No. 928- 4 1-W 4 6 RXD 9895, Stancor Model STA-300R, or equivalent). 3 GND 8 TXD ID DS2480B Note 2: The color of the DS9097U plastic case can 2 5 GND CHIP 1 vary. 7 2 1 ORDERING INFORMATION PART TYPE DB25 VERSION DS9097U-009 DB9, with DS2502 ID chip POWER JACK DS9097U-S09 DB9, no ID chip RS-232 DS9097U-E25 DB25, with EPROM write COM PORT RJ-11 Denotes a RoHS-compliant device that may include lead(Pb) that 5V is exempt under the RoHS requirements. 6 RTS REG 5 9V DTR 4 1-W 4 6 RXD 3 GND 8 TXD 1-Wire is a registered trademark of Maxim Integrated P roducts, Inc. DS2480B 2 5 GND Pin Configurations appear at end of data sheet. 1 7 2 Functional Diagrams continued at end of data sheet. 1 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 Maxims website at www.maxim integrated.com. 19-4874 Rev 6/11 AVAILABLEDS9097U 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 aW indows- based PC to directly communicate with any 1-Wire device connected to the adapters RJ11 port. The DB9 version reads and writes any non-EPROM -1Wire device. To write to EPROM devices, the DB25 version with external power supply is required. For a list of suitable 1W- ire 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). DD Free software drivers can be downloaded from www.maxim-ic.com/1-Wiredrivers. The DS9097U communicates with 1W- ire 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 -RS232 data rates of 19200bps, 57600bps, and 115200bps. The two higher rates are ecr 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 DB9 versions of this adapter do not work with such ports. The DS9097U-E25 adapter, howevferunc, tions in most cases if external power is supplied. Without EPROM programming, the external powercan 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