PCA9558 8-bit I2C And SMBus I/O Port With 5-bit Multiplexed/1-bit Latched 6-bit I2C EEPROM DIP Switch And 2-kbit EEPROM

The PCA9558 is a highly integrated, multi-function device that is composed of a 5-bit multiplexed/1-bit latched 6-bit I2C SMBus EEPROM DIP Switch an 8-bit I/O expander and a 2-kbit serial EEPROM with write protect. The PCA9558 integrates these commonly used components into a single chip to reduce component count and board space requirements and is useful in computer, server and telecom/networking applications. Multiplexed/latched EEPROM DIP Switch , used to select digital information between a set of 5-bits of default hardware inputs and an alternative set of inputs provided by the I2C SMBus Interface and stored in the EEPROM Examples of this type of selection include processor voltage configuration or processor vendor identification (VID). The multiplexed/latched EEPROM CAN also be used to replace DIP switches or jumpers, since the settings CAN be easily changed via I2C SMBus without having to power down the equipment to open the cabinet. The non-volatile memory retains the most current setting selected before the power is turned off. 8-bit I/O expander , used to control, monitor or collect remote information or power LEDs Monitored or collected information CAN be read through the I2C SMBus or CAN be stored in the internal EEPROM 2-kbit serial EEPROM , used to store information such as card identification or revision/maintenance history on every motherboard/linecard and CAN be read or written via I2C SMBus when required. The PCA9558 has 1 address pin allowing up to 2 devices to be placed on the same I2C-bus or SMBus
By NXP Semiconductors