PCA9671BQ,118

I/o Expanders Overview

The PCA9671BQ,118 is a remote 16-bit I/O expander for the Fast-mode Plus (Fm+) I2C-bus with reset functionality. It provides general-purpose remote I/O expansion via a two-line bidirectional bus and serves as a drop-in upgrade for the PCF8575. The device features a 1 MHz I2C interface, compliant with Fast-mode and Standard-mode protocols. It operates within a voltage range of 2.3 V to 5.5 V, supporting 5.5 V tolerant I/Os. Each latched output offers 25 mA sink capability for direct LED driving, with a total package sink capacity of 400 mA. The SDA pin supports 30 mA sink current for buses up to 4000 pF. Sixty-four programmable slave addresses are available using three address pins. The component includes an active LOW reset input, low standby current, and readable device ID information.

I/o Expanders Feature Summary

• Provides 16-bit quasi-bidirectional I/O ports that default to inputs at power-up
• Features latched outputs with high current drive capability suitable for directly driving LEDs
• Includes an active LOW hardware reset input replacing the interrupt output found in predecessor devices
• Supports 64 programmable slave addresses through three dedicated address pins

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 ordering suffix '118' corresponds to the DHVQFN24 package variant when sourcing. Confirm the manufacturer is NXP Semiconductors. Ensure the part number matches the specific revision required for your design. Check datasheet version compatibility for any functional updates.

I/o Expanders Selection Notes

Select this component when upgrading from PCF8575 designs requiring higher bus speeds or drive currents. Consider the DHVQFN24 package for thermal performance if operating near maximum current limits. Verify that the system requires a hardware reset input rather than an interrupt output. Ensure the I2C bus capacitance does not exceed specifications without buffering.

I/o Expanders Part Context

This device belongs to the PCA967x family of remote I/O expanders designed for Fm+ I2C-bus applications. It shares architectural similarities with the PCA9673 but lacks the interrupt output feature. The BQ suffix indicates the DHVQFN24 package type, which is a plastic dual in-line compatible thermal enhanced very thin quad flat package.

I/o Expanders Replacement Considerations

PCA9673: Offers identical electrical characteristics but includes an interrupt output instead of the hardware reset input. PCA9538: Provides 8-bit I/O expansion with interrupt and reset capabilities but differs in bit width and address configuration.