PCA9673DK,118

I/o Expanders Overview

The PCA9673DK,118 is a remote 16-bit I/O expander for the Fast-mode Plus (Fm+) I2C-bus with interrupt and reset capabilities. It provides general-purpose remote I/O expansion for most microcontroller families via the two-line bidirectional bus. The device features a 1 MHz I2C interface compliant with Fast and Standard modes, offering higher speeds than legacy counterparts. It operates within a voltage range of 2.3 V to 5.5 V with 5.5 V tolerant I/Os. The component includes latched outputs with 25 mA sink capability per pin and a total package sink capacity of 400 mA. It supports 16 programmable slave addresses using two address pins and features an active LOW open-drain interrupt output.

I/o Expanders Feature Summary

• Supports high-speed 1 MHz I2C communication for efficient data transfer
• Provides hardware interrupt signaling to notify microcontrollers of input changes
• Includes dedicated hardware reset functionality alongside power-on reset
• Features robust current drive capabilities suitable for direct LED driving

I/o Expanders Applications

• LED signs and displays
• Servers
• Industrial control systems
• Medical equipment
• Programmable Logic Controllers (PLCs)

I/o Expanders Procurement Notes

Verify the specific suffix DK indicates the HVQFN24 package variant when sourcing. Confirm the manufacturer designation matches NXP Semiconductors specifications. Ensure compatibility with existing PCB footprints for the DHVQFN24 or HVQFN24 form factor depending on the exact revision requirements. Cross-reference the ordering information table to validate the part number against the intended package type before procurement.

I/o Expanders Selection Notes

Select this component when upgrading from PCF8575 devices requiring higher bus speeds and drive currents. Consider the 16-bit port count and 25 mA per-pin sink capability for direct load driving needs. Evaluate the availability of 16 unique addresses for complex bus topologies. Ensure the operating temperature range of -40 °C to +85 °C meets environmental constraints. Verify that the 2.3 V minimum supply voltage aligns with the system power architecture.

I/o Expanders Part Context

The PCA9673 series serves as a drop-in upgrade for the PCF8575 family, enhancing performance through increased I2C speed and drive strength. It replaces the A2 address pin with a RESET input, expanding configuration options. The device is part of NXP's Fast-mode Plus family, designed to support more devices on the bus without buffers. It offers improved total package sink capacity compared to previous generations.

I/o Expanders Replacement Considerations

PCA9673D, PCA9673PW, PCA9673BS are alternative package variants of the same functional device.