The DS2480B is a serial port to 1-Wire® interface chip that supports regular and overdrive speeds. It connects 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. 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 various control functions of the DS2480B are optimized for MicroLAN 1-Wire networks and support the special needs of all current 1-Wire/iButton 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.
Key Features
Universal, Common-Ground Serial Port to 1-Wire Line Driver for MicroLAN Applications
Works with All iButtons and MicroLAN Compatible 1-Wire Slave Devices
Communicates at Regular and Overdrive 1-Wire speed and Serial Port Data Rates of 9600 (default), 19200, 57600, and 115200bps
Supports 12V EPROM Programming and Stiff 5V Pullup for Sensors and EEPROM
Self-Calibrating Time Base with ±5% Tolerance for Serial and 1-Wire Communication
Slew Rate Controlled 1-Wire Pulldown and Active Pullup to Accommodate Long Lines and Reduce Radiation
User-Selectable RXD/TXD Polarity Minimizes Component Count When Interfacing to 5V Based RS232 Systems or Directly to UARTs
Programmable 1-Wire Timing and Driver Characteristics Accommodate a Wide Range of MicroLAN Configurations at Regular Speed
Smart Protocol Combines Data and Control Information Without Requiring Extra Pins
Compatible with Optical, IR, and RF to RS232 Converters
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