PCA9559PW,118

Specialized Overview

The PCA9559PW,118 is a 20-pin CMOS device designed for system configuration without DIP switches. It integrates a 6-bit non-volatile EEPROM register, five hardware pin inputs, and a 5-bit multiplexed output with one latched EEPROM bit. The supply voltage ranges from 3.0 V to 3.6 V. It supports I2C-bus and SMBus communication with a maximum clock frequency of 400 kHz. The device features two address pins (A0, A1) allowing up to four devices on the same bus. It operates within an ambient temperature range of 0 °C to 70 °C.

Specialized Feature Summary

• Features a 5-bit 2-to-1 multiplexer and a 1-bit latch DIP switch function.
• Contains a 6-bit internal non-volatile register programmable via I2C-bus.
• Includes an active-LOW OVERRIDE_N input that forces all outputs to logic 0.
• Provides ESD protection exceeding 2000 V HBM and 1000 V CDM.

Specialized Applications

• Mobile and Desktop VID Configuration
• Server and telecom/networking applications replacing DIP switches
• Jumperless configuration of PC motherboards

Specialized Procurement Notes

Verify the specific ordering suffix

Specialized Selection Notes

Select this component when jumperless system configuration is required for CPU VID settings or motherboard setup. Ensure the design accommodates the 3.0 V to 3.6 V supply voltage range and utilizes the I2C/SMBus interface. Consider the TSSOP20 package dimensions and thermal resistance characteristics during PCB layout.

Specialized Part Context

This part belongs to the PCA9559 series, which functions as an I2C-bus EEPROM DIP switch. It is distinct from standard I/O expanders like the PCA9557 or PCA9559 by its specific focus on multiplexing hardware inputs and non-volatile memory for configuration purposes rather than general-purpose GPIO expansion.

Specialized Replacement Considerations

Public confirmed substitute part numbers are not available in the provided documentation.

Specialized FAQ

How does the MUX_SELECT signal affect the outputs?

When MUX_SELECT is logic 0, the multiplexer selects data from the non-volatile register. When it is logic 1, it selects data from the MUX_IN lines.

What is the function of the WP input?

The Write Protect (WP) input controls the ability to write to the non-volatile register. Logic 0 allows writing, while logic 1 prevents data from being written.

Can multiple PCA9559 devices share the same I2C bus?

Yes, the device has two address pins (A0 and A1), allowing up to four devices to be placed on the same I2C-bus or SMBus.