Product Summary

The DS2480B is a Serial 1-Wire Line Driver with Load Sensor. 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. 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 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 on-chip timing generator. The DS2480B 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 DS2480B 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.

Parametrics

DS2480B absolute maximum ratings: (1)Voltage on 1-W to Ground: –0.5V to +14.0V; (2)Voltage on RXD, TXD, POL to Ground: –0.5V to +7.0V; (3)Operating Temperature: –40℃ to +85℃; (4)Storage Temperature: –55℃ to +125℃; (5)Soldering Temperature: 260℃ for 10 seconds.

Features

DS2480B features: (1)Universal, common-ground serial port to 1 Wire line driver for MicroLAN applications; (2)Works with all iButtons and MicroLANcompatible 1-Wire slave devices; (3)Communicates at regular and Overdrive 1-Wire speed and serial port data rates of 9600 (default), 19200, 57600 and 115200 bps; (4)Supports 12V EPROM programming and stiff 5V pullup for crypto iButton, sensors and EEPROM; (5)Load sensor to terminate the stiff pullup as the energy demand of the crypto iButton drops; (6)Self-calibrating time base with ±5% tolerance for serial and 1-Wire; (7)communication; (8)Slew rate controlled 1-Wire pulldown and active pullup to accommodate long lines and reduce radiation; (9)User-selectable RXD/TXD polarity minimizes component count when interfacing to 5V based RS232 systems or directly to UARTs; (10)Programmable 1-Wire timing and driver characteristics accommodate a wide range of MicroLAN configurations at regular speed; (11)Smart protocol combines data and control information without requiring extra pins; (12)Compatible with optical, IR and RF to RS232 converters; (13)Low cost 8-pin SOIC surface mount package; (14)Operates over 4.5V to 5.5V from -40℃ to +85℃.

Diagrams

DS2480B block diagram

Image Part No Mfg Description Data Sheet Download Pricing
(USD)
Quantity
DS2480B
DS2480B

Maxim Integrated Products

Buffers & Line Drivers

Data Sheet

Negotiable 
DS2480B/T&R
DS2480B/T&R

Maxim Integrated Products

Buffers & Line Drivers

Data Sheet

Negotiable 
DS2480B+T&R
DS2480B+T&R

Maxim Integrated Products

Buffers & Line Drivers Serial - 1-Wire Line Driver

Data Sheet

0-1905: $1.48
1905-2500: $1.48
DS2480B+
DS2480B+

Maxim Integrated Products

Buffers & Line Drivers Serial - 1-Wire Line Driver

Data Sheet

0-1: $3.31
1-25: $2.22
25-50: $1.61
50-100: $1.59