DESCRIPTION
The PCA9559 is a 20-pin CMOS device consisting of one 6-bit non-volatile EEPROM registers, 5 hardware pin inputs and a 5-bit multiplexed output with one latched EEPROM bit. It is used for DIP switch-free or jumper-less system configuration and supports Mobile and Desktop VID Configuration, where 2 preset values (1 set of internal non-volatile registers and 1 set of external hardware pins) set processor voltage for operation in either performance or deep sleep modes. The PCA9559 is also useful in server and telecom/networking applications when 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.

FEATURES
• 5-bit 2-to-1 multiplexer, 1-bit latch DIP switch
• 6-bit internal non-volatile register
• Internal non-volatile register programmable and readable via I2C-bus
• Override input forces all outputs to logic 0
• 5 open drain multiplexed outputs
• 1 open drain non-multiplexed (latched) output
• 5 V and 2.5 V tolerant inputs
• Useful for ‘jumperless’ configuration of PC motherboards
• 2 address pins, allowing up to 4 devices on the I2C-bus
• ESD protection exceeds 2000 V HBM per JESD22-A114, 200 V MM per JESD22-A115 and 1000 V CDM per JESD22-C101
• Latch-up testing is done to JESDEC Standard JESD78 which exceeds 100 mA