DS1411_11 Datasheet, PDF (1/2 Pages) Maxim Integrated Products – Provides Strong Pullup to 5V for Temperature iButton and EEPROM iButton

19-4862; Rev 6/11
DS1411
Serial Port iButton Holder
FEATURES
 Small Size, True-Ground Interface to an
RS-232 COM Port for Reading and Writing
iButton^® Devices
 CE and FCC Compliant
 Works with Bipolar Logic Signals of ±5V to
± 12V (RS-232C) 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 and EEPROM iButton
 Communicates at Data Rates of 9.6kbps
(default), 19.2kbps, 57.6kbps, and 115.2kbps
 Powered Entirely from an RS-232 Interface
 Standard DB9 Female Connector for Mating
to the COM Port of a Computer with
DS9098P iButton Retainer for a Single
iButton
SCHEMATIC (FOR ILLUSTRATION)
RS-232
COM PORT
DS1411-009
ONLY
5V
RTS
REG
DTR
RXD
46
TXD
GND
8
DS2480B ₅
ID
CHIP
7
2
1
 Includes DS2502 Identification Chip
(DS1411-009 Version Only)
ORDERING INFORMATION
PART
TYPE
DS1411-009# DB9 connector, with ID chip
DS1411-S09# DB9 connector, no ID chip
#Denotes a RoHS-compliant device that may include lead(Pb) that is
exempt under the RoHS requirements.
DESCRIPTION
The DS1411 is a sophisticated RS-232-to-1-Wire^® adapter and iButton holder that 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 read all and write any non-EPROM iButton devices.
The DS1411 has a DS9098P retainer for a single F5 MicroCan. For a list of suitable 1-Wire network
cables, e.g., to connect multiple iButtons, refer to the Connectivity Matrix table in the DS1402x 1-Wire
network cables data sheet. 1-Wire communication is supported by the adapter for standard 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 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 DS1411 operates in a byte mode, every data byte received from the RS-232 port generates eight
time slots on the 1-Wire bus. The DS1411 is based on the DS2480B serial 1-Wire line driver chip. The
RXD/TXD polarity select input of the DS2480B is connected to V_DD (noninverting). Free software
drivers can be downloaded from www.maxim-ic.com/1-Wiredrivers.
iButton and 1-Wire are registered trademarks of Maxim Integrated Products, Inc.
Windows is a registered trademark of Microsoft Corp.
1 of 2