NXP PCA9558PW,112 I/O Expander TSSOP28 SMD (Pk of 5)

Manufactured by NXP - Part # PCA9558PW,112
Pack of 5 expanders

NXP PCA9558PW,112 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 in a TSSOP28 Surface Mount package

Supplied in a sealed RS Components package of 5 expanders.
RS Components Part # - 511-121
RoHS Compliant Item

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.

• 5-bit 2-to-1 multiplexer, 1-bit latch DIP switch
• 6-bit MUX_OUTx and NON_MUXED_OUT EEPROM programmable and readable via I2C-bus
• 5 V tolerant open drain MUX_OUTx and NON_MUXED_OUT outputs
• Active-LOW override input forces all MUX_OUTx outputs to logic 0
• I2C readable MUX_INx inputs
• 5 V tolerant open drain I/Ox pins, power-up default as outputs
• 1 address pin, allowing up to 2 devices on the I2C-bus
• Active-LOW reset input with internal pull-up for the 8 I/O pins
• 2048-bit EEPROM programmable and readable via the I2C or I/Os
• Operating power supply voltage range of 3.0V to 3.6V
• SMBus compliance with fixed 3.3 V levels
• 2.5 V to 5 V tolerant inputs