PCA9558 2 8-bit I C-bus and SMBus I/O port with 5-bit multiplexed/1-bit 2 latched 6-bit I C-bus EEPROM DIP switch and 2-kbit EEPROM Rev. 5 25 June 2012 Product data sheet 1. General description The PCA9558 is a highly integrated, multi-function device that is composed of a 5-bit 2 multiplexed/1-bit latched 6-bit I C-bus/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 2 provided by the I C-bus/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 2 DIP switches or jumpers, since the settings can be easily changed via I C-bus/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 2 LEDs. Monitored or collected information can be read through the I C-bus/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/line card and can be read or 2 written via I C-bus/SMBus when required. The PCA9558 has one address pin, allowing up to two devices to be placed on the same 2 I C-bus or SMBus. 2. Features and benefits 5-bit 2-to-1 multiplexer, 1-bit latch DIP switch 6-bit MUX OUTx and NON MUXED OUT EEPROM programmable and readable via 2 I C-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 2 I C-bus readable MUX INx inputs 5 V tolerant open-drain IOx pins, power-up default as outputs 2 One address pin, allowing up to two devices on the I C-bus Active LOW reset input with internal pull-up for the eight I/O pins 2 2048-bit EEPROM programmable and readable via the I C-bus or I/Os Operating power supply voltage range of 3.0 V to 3.6 V SMBus compliance with fixed 3.3 V levelsPCA9558 NXP Semiconductors 2 8-bit I C-bus/SMBus I/O port 2.5 V to 5 V tolerant inputs ESD protection exceeds 2000 V HBM per JESD22-A114 and 1000 V CDM per JESD22-C101 Latch-up testing is done to JEDEC Standard JESD78 which exceeds 100 mA 3. Applications Board version tracking and configuration Board health monitoring and status reporting Multi-card systems in telecom, networking and base station infrastructure equipment Field recall and troubleshooting functions for installed boards General-purpose integrated I/O with DIP switch and memory 4. Ordering information Table 1. Ordering information Type number Topside mark Temperature Package range Name Description Version PCA9558PW PCA9558DH 0 C to 70 C TSSOP28 plastic thin shrink small outline package SOT361-1 28 leads body width 4.4 mm PCA9558 All information provided in this document is subject to legal disclaimers. NXP B.V. 2012. All rights reserved. Product data sheet Rev. 5 25 June 2012 2 of 29