Bi-Directional Buffer ICs for the I²C-Bus
The P82B96 und PCA9600 buffer ICs from NXP make it easy for designers to use the I²C-bus (and its derivatives) for long-distance communications or optoelectrical isolation purposes. They interconnect several buses or can split a single
bus into two unidirectional data streams.
Designed for usewith the I²C-bus and similar bi-directional buses, including SMBus and PMBus, the NXP P82B96 and PCA9600 provide true buffer functionality and extend the I²C-bus and its derivatives beyond the specification’s maximum bus capacitance of 400 pF.
The buffers can be used to interconnect several buses or, using analog techniques, can be used to “split” the bi-directional bus signals into two conventional, unidirectional data streams, so data can be transmitted over a wider array of media. The buffers can also recombine two split data streams, to restore the original, bi-directional I²C-bus signal.
Product Features
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Dual buffers (bi-directional) in 8-pin DIL/SO/MSOP packaging
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Bus speeds: up to 1 MHz
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Sx/Sy-side compatibility with I²C-bus, SMBus, and PMBus
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Tx/Rx-side compliance with 30 mA Fastmode Plus I²C-bus specification
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Wide supply and bus voltage range up to 15 V
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Can handle or level-shift logic signals (2 to 15 V)
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Connected buses are released if supply fails
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Splits the I²C-bus into two unidirectional Tx and Rx data signals, or re-combines them
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Safe isolation of the bus via simple interface to opto-couplers
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Optional x10 impedance reduction |
Applications
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Building large or distributed I²C-bus systems for automation/control/displays
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Transmitting I²C-bus signals over longdistance,
twisted-pair cabling
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Galvanic/safety (opto) isolation of sections of the I²C-bus
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Interfacing between logic devices or buses on different voltages
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Hot-plugging bus interface protection
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Interfacing SMBus to I²C-bus
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Interfacing 3 mA I²C-bus devices to a 30 mA Fast-mode Plus bus, at speeds to 1 MHz
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I²C-bus signalling via differential bus hardware (CAN bus, RS-485 etc.)
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Transmitting I²C-bus signals over RF links |
| NXP´s I²C-bus evaluation board with P82B96/
PCA9600 daughter board, enabling the transmission
of I²C-bus signals over twisted-pair cabling. |
Additional Information
For detailed specifications please contact
your local SPOERLE Branch Office or visit
www.nxp.com
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