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Philips multiplexed EEPROMs target I2C, SMBus apps

Posted: 24 Jul 2002 ?? ?Print Version ?Bookmark and Share

Keywords:royal philips electronics? pca9558? pca9560? pca9561? multiplexed eeprom?

Royal Philips Electronics has introduced a family of multiplexed EEPROMsincluding the PCA9558, PCA9560, and PCA9561that target I2C and SMBus applications found in notebook PCs, servers, and telecom and networking equipment.

The PCA9558 is composed of a 5-bit multiplexed, 1-bit latched, 6-bit I2C/SMBus EEPROM, an 8-bit I/O expander, and a 2kb serial EEPROM with write protect.

The PCA9560 device is a dual 5-bit multiplexed, 1-bit latched, 6-bit I2C/SMBus EEPROM with two sets of internal non-volatile 6-bit EEPROMs. It is used for applications that require three settings, such as the ac, battery, and deep sleep modes in notebook computers.

The PCA9561 device integrates four 6-bit non-volatile registers and allows five different sets of 6-bit values (four internal 6-bit registers and one group of six external hardware pins) to be preset and selected without having to send lengthy commands via the I2C bus.

For laptops, the devices enable the use of the SMBus interface to optimize the laptop processor voltage configuration for different power sources where there is a requirement for different processor voltage.

In server, telecom, and networking applications, the devices replace dip switches or jumpers because the device output settings can be simply changed via the I2C bus without having to power down the equipment or open the cabinet.

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