DS9097U DALLAS | Alldatasheet

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Technical content

Universal 1-Wire® COM Port Adapter

FEATURES

/elevenoclock True-ground interface to an RS232 COM Port for reading and writing 1-Wire devices /elevenoclock Works with bipolar as well as unipolar logic signals /elevenoclock Compatible to COM ports of (±)5V to (±)12V (DB-9 version only) or (±)6V to (±)12V (DB-25 version) /elevenoclock Supports reading and writing at regular and Overdrive speeds /elevenoclock Provides strong pull-up to 5V for Tempera- ture-, Crypto- and EEPROM 1-Wire devices /elevenoclock Programs 1-Wire EPROM devices (DB-25 version with external 12V power supply only) /elevenoclock Communicates at data rates of 9.6 (default), 19.2, 57.6 and 115.2 kbits/s /elevenoclock Standard DB-9 or DB-25 female connector and 6-lead RJ-11 connector for easy attach- ment of standard 1-Wire cables and probes /elevenoclock Includes DS2502 identification chip (DS9097U-009 only) PIN ASSIGNMENT DB-25: TXD (2), RXD (3), DTR (20), RTS (4), PC-Ground (7); all other pins not connected DB-9: TXD (3), RXD (2), DTR (4), RTS (7), PC-Ground (5); all other pins not connected NOTE: The external supply for the DS9097U-E25 must provide well regulated 12V @ 10 mA minimum, center = GND, outer ring = V+ (Newark Electronics Stock No. 84F2081, Allied Electronics Stock No. 928-9895, Stancor Model STA-300R, or equivalent)

ORDERING INFORMATION

DS9097U-009 DB-9, with DS2502 ID chip DS9097U-S09 DB-9, no ID chip DS9097U-E25 DB-25, with EPROM write PACKAGE OUTLINE DB-09 version SIDE VIEW REAR VIEW RJ-11 pin 1 DB-25 version RJ-11 pin 1 SIDE VIEW REAR VIEW + contact - contact 2.1mm power jack SCHEMATIC (for illustration) DB-9 version RTS DTR RXD TXD GND RS232 COM Port Reg. DS 2480B RJ-11 1-W GND ID Chip DS9097U-009 only DB-25 version RTS DTR RXD TXD GND RS232 COM Port Reg. DS 2480B RJ-11 1-W GND Power Jack www.dalsemi.com

DESCRIPTION

The DS9097U is a sophisticated RS232 to 1-Wire Adapter, which performs RS232 level conversion and actively generates the 1-Wire communication signals. Together with an adequate TMEX software driver it enables an IBM-compatible PC to directly communicate with any 1-Wire device connected to the adapter's RJ-11 port. The DB-9 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. All DS9097U adapters are based on the DS2480B Serial 1-Wire Line Driver chip and therefore are not a plug-in replacement for the DS9097 or DS9097E . The RXD/TXD Polarity Select input of the DS2480B is tied to Vdd (non-inverting). Free software drivers can be downloaded from http://www.ibutton.com/software/tmex/index.html. The DS9097U communicates with 1-Wire devices at regular speed as well as Overdrive speed. The serial port must support a data transmission rate of 9600 bits/s. Under software control, the adapter can be set up for RS232 data rates of 19200, 57600 and 115200 bits per second. The two higher rates are rec- ommended for communication at Overdrive speed with Overdrive capable devices. Since the DS9097U operates in a byte mode, every data byte received from the RS232 port generates eight time slots on the 1-Wire line. At 19200 bits/s data rate the DS9097U-E25 is already faster than the DS9097 (E) at 115200 bits/s. Note that there are some COM ports that use signal levels of less than ( ±) 5V. The DB-9 versions of this adapter will not work with such ports. The DS9097U-E25 adapter, however, will function in most cases if external power is supplied. Without EPROM programming the external power may be anywhere in the range of 6 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.