PCA8575DB,112

I/o Expanders Overview

The PCA8575DB,112 is a remote 16-bit I/O expander for the I2C-bus with interrupt output. It provides general-purpose remote I/O expansion via two-line bidirectional communication (SCL, SDA). The device features a 16-bit quasi-bidirectional port and an I2C interface. Operating voltage ranges from 2.3 V to 5.5 V with 5.5 V tolerant I/Os. It includes latched outputs with 25 mA sink capability per pin and a total package sink capability of 400 mA. The component supports a maximum clock frequency of 400 kHz and operates within a temperature range of -40 °C to +85 °C. It utilizes an active LOW open-drain interrupt output and offers 8 programmable slave addresses using three address pins.

I/o Expanders Feature Summary

• Provides 16-bit remote I/O expansion via a standard two-line bidirectional I2C-bus interface.
• Features latched outputs capable of directly driving LEDs with high current drive capability.
• Includes an active LOW open-drain interrupt line that signals incoming data changes without bus communication.
• Supports eight programmable target addresses through dedicated address input pins.

I/o Expanders Applications

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

I/o Expanders Procurement Notes

Verify the specific ordering suffix against official documentation to confirm package type and tape-and-reel specifications. Confirm RoHS compliance status and lead time requirements with authorized distributors prior to procurement. Ensure the component meets environmental operating conditions required for the final application design.

I/o Expanders Selection Notes

Select this component when expanding microcontroller I/O capabilities via I2C is required. Ensure the system voltage falls within the 2.3 V to 5.5 V range. Verify that the load current requirements do not exceed the 25 mA per pin or 400 mA total package limits. Consider the SSOP24 package dimensions for PCB layout constraints.

I/o Expanders Part Context

The PCA8575DB is part of the broader PCA8575 family of 16-bit I/O expanders. This family includes variants such as PCA8575D, PCA8575PW, and PCA8575BQ, which differ primarily in packaging options like SO24, TSSOP24, and HVQFN24. All variants share identical electrical characteristics and functional behavior, offering flexibility in mechanical design while maintaining software compatibility.

I/o Expanders Replacement Considerations

The PCF8575 serves as a drop-in replacement for the PCA8575 without electrical or software modifications. Note differences in interrupt output release timing during read operations between the two devices. Verify pinout compatibility and ensure the substitute meets the same voltage and current specifications.