PCA9673BQ,118

I/o Expanders Overview

The PCA9673BQ,118 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 16 quasi-bidirectional pins that default to inputs at power-up. Each pin supports a latched output sink capability of 25 mA, while the total package sink capacity reaches 400 mA. It includes an active LOW open-drain interrupt output and allows for 16 programmable slave addresses using two address pins.

I/o Expanders Feature Summary

• Supports 1 MHz I2C bus interface compliant with Fast and Standard modes
• Features latched outputs with high current drive capability for direct LED driving
• Includes active LOW open-drain interrupt output for microcontroller notification
• Provides readable device ID containing manufacturer, part identification, and revision data

I/o Expanders Applications

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

I/o Expanders Procurement Notes

Verify the ordering suffix

I/o Expanders Selection Notes

Select this component when upgrading from PCF8575 devices requiring higher bus speeds and drive currents. Ensure the application utilizes the DHVQFN24 package constraints, specifically connecting the exposed thermal pad to the PCB ground plane for proper operation. Confirm that the system accommodates the 16 available slave addresses via AD0 and AD1 pins.

I/o Expanders Part Context

This part belongs to the PCA9673 series, which serves as a drop-in upgrade for the PCF8575 family. It offers enhanced performance including increased I2C speed up to 1 MHz and higher sink currents compared to its predecessor. The BQ variant specifically denotes the DHVQFN24 package type, distinguishing it from SO24 or TSSOP24 options in the same functional family.

I/o Expanders Replacement Considerations

PCA9673D (SO24), PCA9673PW (TSSOP24), PCA9673BS (HVQFN24). These parts share identical electrical characteristics and functionality but differ only in physical package dimensions and pinout configurations.