DESCRIPTION

The DS2480 is a serial port to 1–Wire interface chip that supports standard 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–WireTM line driver for MicroLANTM 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 pull–up for Crypto iButton, sensors and EEPROM

•Self–calibrating time base with ±5 tolerance for serial and 1–Wire communication

•Slew rate controlled 1–Wire pull–down and active pull–up 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 characteris tics accommodate a wide range of MicroLAN configurations at regular speed

•Smart protocol combines data and control information without requiring extra pins

•Compatible to 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