DS2480B+T&R

The DS2480B+T&R is a serial to 1-wire line driver in 8 pin NSOIC package. This interface chip 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 host of burden of generating the time-critical 1-wire communication waveforms. The device can translate each character into eight 1-wire time slots thereby increasing data throughput significantly. It 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. This IC 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, it allows easy realization of 1-wire media jumpers.

• Supply voltage range is 4.5V to 5.5V, operating temperature range from -40°C to 85°C
• Simplifies the design of a low-cost, universal RS232 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 pull down & active pull-up to accommodate long lines & reduce radiation
• Self-calibrating time base with ±5% tolerance for serial and 1-wire communication
• Compatible with optical, IR and RF to RS232 converters
• Single product supports various iButton or 1-wire device types for easy system integration

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