I²C multiplexers for more consistant system management

16 Feb 2000 Telecoms, Datacoms, Wireless, IoT

Philips Semiconductors is offering a family of I2C multiplexers designed to provide more reliable, consistent switching for multiple system management buses and multiple I2C devices. Philips Semiconductors continues its leadership in I2C technology, offering a wide range of I2C devices to address all levels of the computing market, including desktop PCs, workstations, and servers.

The PCA954x family is designed for multiple system management buses or multiple I2C devices with the same address, different voltage levels, or loads too large for the I2C master to handle. The devices provide multiplexing and interrupt controlling to eliminate the need for glue logic and general purpose I/Os. In addition, the devices provide diodes to enable shifting between 5,0 and 3,3 V buses and bus isolation to prevent system hang-ups.

The PCA9540 is a two-channel I2C multiplexer without interrupts that switches between two I2C devices or buses. The PCA9542 is a two-channel multiplexer that contains three address pins, allowing a bus to use eight PCA9542s to switch up to 16 I2C devices or buses. The PCA9544 is a four-channel multiplexer that can be used for switching up to 32 I2C devices or buses. Both devices include an interrupt controller to prevent system hang-ups if a bus generates interrupts.

For further information see www.philipslogic.com/i2c or contact local distributors Arrow Altech Distributiion (011) 923 9600, Avnet Kopp (011) 444 2333 and Electrocomp (011) 458 9000.

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