PCA8575BQ,118

I/o Expanders Overview

The PCA8575BQ,118 is a remote 16-bit I/O expander for the I2C-bus with interrupt functionality. It provides general-purpose remote I/O expansion for microcontroller families via a two-line bidirectional I2C interface (SCL, SDA). The device features a 16-bit quasi-bidirectional port and latched outputs with high current drive capability for directly driving LEDs. It includes an active LOW open-drain interrupt output that allows the remote I/O to inform the microcontroller of incoming data without bus communication. The internal Power-On Reset initializes the I/Os as inputs.

I/o Expanders Feature Summary

• Supports 400 kHz I2C-bus interface with 2.3 V to 5.5 V operation and 5.5 V tolerant I/Os
• Features 16-bit remote I/O pins that default to inputs at power-up
• Includes latched outputs with 25 mA sink capability for directly driving LEDs
• Provides active LOW open-drain interrupt output and 8 programmable slave addresses using 3 address pins

I/o Expanders Applications

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

I/o Expanders Procurement Notes

Verify the specific ordering suffix

I/o Expanders Selection Notes

Select this component when a drop-in replacement for the PCF8575 is required with identical electrical and software compatibility. Consider the DHVQFN24 package for thermal performance if board space is limited. Ensure the application utilizes the I2C protocol and requires remote I/O expansion with interrupt capabilities.

I/o Expanders Part Context

The PCA8575BQ belongs to the PCA8575 family of remote 16-bit I/O expanders. It shares functional characteristics with other variants like the PCA8575D and PCA8575PW but differs in physical packaging. The BQ variant specifically denotes the DHVQFN24 package, which offers a compact form factor suitable for space-constrained designs.

I/o Expanders Replacement Considerations

The PCA8575 serves as a drop-in replacement for the PCF8575 without electrical or software modifications. Note differences in interrupt output release timing during read operations compared to the PCF8575.