DS2480B_15 Datasheet, PDF (1/32 Pages) Maxim Integrated Products – Serial to 1-Wire Line Driver

19-5047; 4/15
DS2480B
Serial to 1-Wire Line Driver
BENEFITS AND FEATURES
• Simplifies the Design of a Low-Cost, Universal
RS-232 COM Port to 1-Wire® Interface
True-Ground
o Interface to an RS-232 COM Port for Reading
and Writing 1-Wire Devices
o Works with Bipolar as well as Unipolar Logic
Signals
o Slew Rate Controlled 1-Wire Pulldown and
Active Pullup to Accommodate Long Lines
and Reduce Radiation
o Communicates at Data Rates of 9.6kbps
(default), 19.2kbps, 57.6kbps, and 115.2kbps
o Self-Calibrating Time Base with ±5%
Tolerance for Serial and 1-Wire
Communication
o User-Selectable RXD/TXD Polarity
Minimizes Component Count When
Interfacing to 5V Based RS232 Systems or
Directly to UARTs
o Smart Protocol Combines Data and Control
Information Without Requiring Extra Pins
o Compatible with Optical, IR, and RF to
RS232 Converters
• Single Product Supports Various iButton® or
1-Wire Device Types for Easy System Integration
o Supports Reading and Writing at Standard
and Overdrive Speeds
o Provides Strong Pullup to 5V for Temperature
and EEPROM 1-Wire Devices
o Programs 1-Wire EPROM Devices with
External 12V Power Supply
o Programmable 1-Wire Timing and Driver
Characteristics Accommodate a Wide Range
of Slave Device Configurations at Standard
Speed
o Operates Over 4.5V to 5.5V from -40°C to
+85°C
PIN ASSIGNMENT
GND
1
8
RXD
1-W
2
NC
3
7
TXD
6
POL
VDD
4
5
VPP
8-Pin SO (150 mil)
PIN DESCRIPTION
GND
- Ground
1-W
- 1-Wire Input/Output
NC
- No Connection
V_DD
- 4.5V to 5.5V
V_PP
- Optional EPROM
Programming Voltage
POL
- RXD/TXD Polarity Select
TXD
- Serial Data from UART
RXD
- Serial Data to UART
ORDERING INFORMATION
PART
DS2480B+
TEMP
PIN-
RANGE PACKAGE
-40°C to +85°C 8 SO
DS2480B+T&R -40°C to +85°C 8 SO
+ Denotes a lead(Pb)-free/RoHS-compliant package.
T&R = Tape and reel.
1-Wire and iButton are registered trademarks of
Maxim Integrated Products, Inc.
DESCRIPTION
The DS2480B is a serial port to 1-Wire interface chip that supports standard and overdrive speeds. It con-
nects directly to UARTs and 5V RS232 systems. Interfacing to RS232C (±12V levels) requires a passive
clamping circuit and one 5V to ±12V level translator. Internal timers relieve the host of the burden of
generating the time-critical 1-Wire communication waveforms. In contrast to the DS9097(E) where a full
character must be sent by the host for each 1-Wire time slot, the DS2480B can translate each character
Maxim Integrated 1