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I2C COMPATIBLE DUAL BIDIRECTIONAL BUS BUFFER
DESCRIPTION
The UTC UMX82B96 is a bus buffer that supports
bidirectional data transfer between an I2C bus and a range of
other bus configurations with different voltage and current levels.
One of the advantages of the UTC UMX82B96 is that it
supports longer cables/traces and allows for more devices per I2C
bus because it can isolate bus capacitance such that the total
loading (devices and trace lengths) of the new bus or remote I2C
nodes are not apparent to other I2C buses (or nodes). The
restrictions on the number of I2C devices in a system due to
capacitance, or the physical separation between them, are greatly
improved.
The device is able to provide galvanic isolation (optocoupling)
or use balanced transmission lines (twisted pairs), because
separate directional Tx and Rx signals are provided. The Tx and
Rx signals may be connected directly (without causing bus
latching), to provide an bidirectional signal line with I2C properties
(open-drain driver). Likewise, the Ty and Ry signals may also be
connected together to provide an bidirectional signal line with I2C
properties (open-drain driver). This allows for a simple
communication design, saving design time and costs.
FEATURES
* Operating Power-Supply Voltage Range of 2V to 15V
* Can Interface Between I2C Buses Operating at Different Logic
Levels (2V to 15V)
* Outputs on the Transmission Side (Tx/Ty) Have High Current
Sink Capability for Driving Low-Impedance or High-Capacitive Buses
* Interface With Optoelectrical Isolators and Similar Devices That
Need Unidirectional Input and Output Signal Paths by Splitting
I2C Bus Signals Into Pairs of Forward (Tx/Ty) and Reverse
(Rx/Ry) Signals
* 400-kHz Fast I2C Bus Operation Over at Least 20 Meters of Wire |
