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070302
DS1411
Serial Port iButton Holder
www.maxim-ic.com
FEATURES
Small size, true-ground interface to an RS232
COM Port for reading and writing iButton
devices
CE and FCC compliant
Works with bipolar logic signals of 5V to
12V (RS232C) as well as unipolar signals of
5V to 12V
Supports reading and writing at standard and
Overdrive speeds
Provides strong pullup to 5V for Temperature
iButton, Crypto iButton and EEPROM
iButton
Communicates at data rates of 9.6k (default),
19.2k, 57.6k, and 115.2k bits/s
Powered entirely from an RS232 interface
Standard DB female connector for mating to
the COM Port of a computer with DS9098P
iButton Retainer for a single iButton
Includes DS2502 identification chip
(DS1411-009 version only)
SCHEMATIC (for illustration)
6
4
RTS
DTR
RXD
TXD
GND
RS232
COM Port
5V
Reg.
DS
2480B
1
7
8
5
2
ID
Chip
DS1411-009
only
ORDERING INFORMATION
DS1411-009
DB-9 Connector, with ID chip
DS1411-S09
DB-9 Connector, no ID chip
DESCRIPTION
The DS1411 is a sophisticated RS232-to-1-Wire
adapter and iButton holder that 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 or laptop computer to directly read all and write any
non-EPROM iButton devices. The DS1411 has a DS9098P retainer for a single F5 MicroCan
and can
replace the DS9097U-009 or DS9097U-S09, respectively, in applications that use only a single iButton.
1-Wire communication is supported by the adapter for standard 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
recommended for communication at Overdrive speed with Overdrive capable devices. Since the DS1411
operates in a byte mode, every data byte received from the RS232 port generates eight time slots on the 1-
Wire bus.
The DS1411 is based on the DS2480B Serial 1-Wire Line Driver chip and therefore is not a plug-in
replacement for the DS1412 Serial Port Adapter. The RXD/ TXD Polarity Select input of the DS2480B is
tied to V
DD
(non-inverting).
iButton, 1-Wire, and MicroCan are registered trademarks of
Dallas Semiconductor.
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