DS2480

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. In contrast to the DS9097 (E) where a full character must be sent by the host for each 1-Wire time slot, the DS2480 can translate each character into eight 1-Wire time slots thereby increasing the data throughput significantly. In addition, the DS2480 can be set to communicate at four different data rates including 115.2 kbps, 57.6 kbps and 19.2 kbps with 9.6 kbps being the power-on default. Command codes received from the host's crystal controlled UART serve as a reference to continuously calibrate the onchip timing generator. The DS2480 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 DS2480 are optimized for MicroLAN 1-Wire networks and support the special needs of all current 1-Wire devices including the Crypto iButton, EPROM-based Add-Only Memories, EEPROM devices and 1-Wire Thermometers.