PCA9559

General 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.

The PCA9559 typically resides between the CPU and Voltage Regulator Module (VRM) when used for CPU VID (Voltage IDentification code) configuration. It is used to bypass the CPU-defined VID values and provide a different set of VID values the VRM, if an increase in the CPU voltage is desired. An increase in CPU voltage combined with an increase in CPU frequency leads to a performance boost of up to 7.5pct. Lower CPU voltage reduces power consumption.

The PCA9559 has 2 address pins allowing up to 4 devices to be placed on the same I²C-bus or SMBus.

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

Products/packages

Pricing/ordering/availability

Applications

Related applications
LCD display - discretes focus
PDA - discretes focus
Motherboard components
50-60 Hz CRT integrated DTV (TV210D)
Mid-range integrated DTV (TV810)
Intelligent washing machine

Block diagrams/pinning

Technical documents

Application Notes

AN10216_1; I2C manual (27-Mar-03)

AN10441_1; Level shifting techniques in I²C-bus design (20-Jun-07)

AN250_1; PCA8550 4-bit multiplexed/1-bit latched 5-bit I2C EEPROM (01-Oct-98)

Support Documents

75013239; I 2 C Logic Selection Guide (2005-01-12)

75011212; I2C 2002-1A Evaluation Board Kit (01-Mar-03)

75012744; I2C Bus Solutions 2004 (2004-02-01)

UM10206_1; I2C Demonstration Board 2005-1 Quick Start Guide (13-Jun-06)

philips_i2c_handbook; I2C Handbook (2004-01-01)

39340011_21; I2C-bus specification (version 2.1) (2000-01-01)

UM10204_3; I2C-bus specification and user manual (26-Jun-07)

pca9559; IBIS model of PCA9559 bit multiplexed/1-bit latched 6-bit I2C TSSOP 20-pin Package (1999-09-15)

75016022; NXP 8/16-bit I2C/SMBus GPIO expanders PCA9554/54A/55 (2007-06-01)

75006813; PCA9559 System Mgmt ICs (2002-06-13)

75015669; Your complete choice for I2C-bus peripherals (01-Dec-07)

75014395; Your connection to I 2 C,UART,CAN,and USB Connecting with Philips Wired Connectivity (2005-04-01)

Parametrics/similar products

Similar products

PCA9559 links to the similar products page containing an overview of products that are similar in function or related to the type number(s) as listed on this page. The similar products page includes products from the same catalog tree(s), relevant selection guides and products from the same functional category.

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