Serial to 1-Wire Line Driver

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The DS2480B is a serial port to 1-Wire® interface chip that supports standard and overdrive speeds. It connects directly to UARTs and 5V RS-232 systems. Interfacing to RS-232C (±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 into eight 1-Wire time slots, thereby increasing the data throughput significantly. In addition, the DS2480B can be set to communicate at four different data rates, including 115.2kbps, 57.6kbps, and 19.2kbps, with 9.6kbps being the power-on default. Command codes received from the host's crystal controlled UART serve as a reference to continuously calibrate the on-chip timing generator. The DS2480B uses a unique protocol that merges data and control information without requiring control pins. This approach maintains compatibility to off-the-shelf serial to wireless converters, allowing easy realization of 1-Wire media jumpers. The various control functions of the DS2480B are optimized for 1-Wire networks and support the special needs of all current 1-Wire devices including EPROM-based add-only memories, EEPROM devices, and 1-Wire thermometers. See Application Note 192: Using the DS2480B Serial 1-Wire Driver for detailed software examples.
DS2480B: Block Diagram DS2480B: Block Diagram Enlarge+

Key Features

  • Simplifies the Design of a Low-Cost, Universal RS-232 COM Port to 1-Wire® Interface True-Ground
    • Interface to an RS-232 COM Port for Reading and Writing 1-Wire Devices
    • Works with Bipolar as well as Unipolar Logic Signals
    • Slew Rate Controlled 1-Wire Pulldown and Active Pullup to Accommodate Long Lines and Reduce Radiation
    • Communicates at Data Rates of 9.6kbps (default), 19.2kbps, 57.6kbps, and 115.2kbps
    • Self-Calibrating Time Base with ±5% Tolerance for Serial and 1-Wire Communication
    • User-Selectable RXD/TXD Polarity Minimizes Component Count When Interfacing to 5V Based RS232 Systems or Directly to UARTs
    • Smart Protocol Combines Data and Control Information Without Requiring Extra Pins
    • Compatible with Optical, IR, and RF to RS232 Converters
  • Single Product Supports Various iButton® or 1-Wire Device Types for Easy System Integration
    • Supports Reading and Writing at Standard and Overdrive Speeds
    • Provides Strong Pullup to 5V for Temperature and EEPROM 1-Wire Devices
    • Programs 1-Wire EPROM Devices with External 12V Power Supply
    • Programmable 1-WireTiming and Driver Characteristics Accommodate a Wide Range of Slave Device Configurations at Standard Speed
    • Operates Over 4.5V to 5.5V from -40°C to +85°C

Pricing Notes:
This pricing is BUDGETARY, for comparing similar parts. Prices are in U.S. dollars and subject to change. Quantity pricing may vary substantially and international prices may differ due to local duties, taxes, fees, and exchange rates. For volume-specific and version-specific prices and delivery, please see the price and availability page or contact an authorized distributor.
Product Reliability Reports: DS2480B.pdf 
Device   Fab Process   Technology   Sample size   Rejects   FIT at 25°C   FIT at 55°C   Material Composition  

Note : The failure rates are summarized by technology and mapped to the associated material part numbers. The failure rates are highly dependent on the number of units tested.

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