DESCRIPTION

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.

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 115200 bps

Supports 12V EPROM programming and stiff 5V pullup for crypto iButton, sensors and EEPROM

Load sensor to terminate the stiff pullup as the energy demand of the crypto iButton drops

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

Low cost 8-pin SOIC surface mount package

Operates over 4.5V to 5.5V from -40°C to +85°C