PCA9673D,112

I/o Expanders Overview

The PCA9673D,112 is a remote 16-bit I/O expander for Fast-mode Plus I2C-bus systems with interrupt and reset capabilities. It operates within a voltage range of 2.3 V to 5.5 V and features 5.5 V tolerant I/Os. The device provides latched outputs with a 25 mA sink capability per pin and a total package sink capacity of 400 mA. It supports a 1 MHz I2C-bus interface compliant with Fast and Standard modes, offering a 30 mA SDA sink capability. The component includes an active LOW open-drain interrupt output and allows for 16 programmable slave addresses using two address pins.

I/o Expanders Feature Summary

• Provides general purpose remote I/O expansion via the two-line bidirectional I2C-bus
• Features hardware interrupt output (INT) to notify microcontrollers of port data changes
• Includes hardware reset input (RESET) and internal Power-On Reset functionality
• Offers high current drive capability with 25 mA sink per pin and 400 mA total package capacity

I/o Expanders Applications

• LED signs and displays
• Servers
• Industrial control
• Medical equipment
• PLCs

I/o Expanders Procurement Notes

Verify the specific ordering suffix '112' against the manufacturer's official documentation to confirm tape and reel packaging specifications. Ensure the SO24 plastic small outline package variant matches the design requirements. Cross-reference the part number with the latest datasheet revision to confirm compliance with all electrical characteristics and operational temperature ranges before finalizing procurement orders.

I/o Expanders Selection Notes

Select this component when upgrading from PCF8575 devices to utilize higher bus speeds and drive capabilities. The PCA9673 replaces the A2 address pin with a RESET input, enabling more flexible system configurations. Consider the 16 available slave addresses and the ability to support PWM dimming due to the 1 MHz Fm+ speed. Evaluate the need for direct LED driving given the 25 mA per pin sink capability.

I/o Expanders Part Context

The PCA9673 serves as a drop-in upgrade for the PCF8575, offering enhanced performance through increased I2C bus speed and drive strength. It belongs to the Fast-mode Plus family and is designed for applications requiring efficient remote I/O management. The device integrates an interrupt line and hardware reset, distinguishing it from standard I/O expanders by providing event-driven communication capabilities.

I/o Expanders Replacement Considerations

The PCA9673 is explicitly documented as a drop-in upgrade for the PCF8575. When replacing the PCF8575, note that the A2 address pin on the legacy device is replaced by a RESET input on the PCA9673. This change affects address configuration but maintains compatibility with existing I2C bus architectures.