DS2480B+

The DS2480B+ is a serial port to 1-Wire® Interface Chip, supports standard and overdrive speeds. It connects directly to UARTs and 5V RS-232 systems. Interfacing to RS-232C (±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 DS2480B+ can translate each character into eight 1-Wire time slots, thereby increasing the data throughput significantly. In addition, the DS2480B+ can be set to communicate at four different data rates, including 115.2, 57.6 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.

• Simplifies design of universal RS-232 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 pulldown & active pullup to accommodate long lines and reduce radiation
• Communicates at data rates of 9.6kbps (default), 19.2kbps, 57.6kbps and 115.2kbps
• Self-calibrating Time Base with ±5% Tolerance for Serial and 1-Wire Communication
• User-selectable RXD/TXD Polarity minimizes component count when Interfacing to 5V based RS232 System
• Smart Protocol Combines Data and Control Information Without Requiring Extra Pins
• Compatible with optical, IR and RF to RS232 converters
• Single Product Supports Various iButton® or 1-Wire Device Types for Easy System Integration
• Supports reading and writing at standard and overdrive speeds
• Provides strong pullup to 5V for temperature and EEPROM 1-wire devices
• Programs 1-wire EPROM devices with external 12V power supply

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Valor nominal, no se garantiza la operación funcional del dispositivo en estas condiciones o en cualquier otra condición indicada en las secciones de operación para esta especificación.

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