PCA9671BS,118

I/o Expanders Overview

The PCA9671BS,118 is a remote 16-bit I/O expander for the Fast-mode Plus (Fm+) I2C-bus with an active LOW reset input. It operates between 2.3 V and 5.5 V with 5.5 V tolerant I/Os. The device features a 1 MHz I2C interface, 30 mA SDA sink capability, and latched outputs with 25 mA sink capability per pin. Total package sink capacity reaches 400 mA. It provides 64 programmable slave addresses using three address pins and includes readable device ID information. The component supports low standby current and functions within a temperature range of -40 °C to +85 °C.

I/o Expanders Feature Summary

• Fast-mode Plus I2C interface supporting up to 1 MHz bus speed
• High drive capability with 25 mA per pin and 400 mA total package sink capacity
• Active LOW hardware reset input replacing interrupt output found in predecessor devices
• Readable device ID field providing manufacturer, part identification, and revision data

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 specific HVQFN24 package variant matches the design requirements. Confirm that the ordering suffix indicates the correct reel packaging orientation. Ensure the voltage supply range aligns with the system's power rails before finalizing procurement.

I/o Expanders Selection Notes

Select this component when high-speed I2C communication and significant LED drive current are required. It serves as a drop-in upgrade for PCF8575 designs needing increased bus drive and more available addresses. Consider the 16-bit port count and the absence of an interrupt output when choosing over variants like the PCA9673.

I/o Expanders Part Context

This device belongs to NXP's Fast-mode Plus family of I/O expanders. It is designed to replace older standard I2C expanders by offering faster bus speeds and higher current capabilities. The BS suffix denotes the HVQFN24 package type, which is a plastic thermal enhanced very thin quad flat package without leads.

I/o Expanders Replacement Considerations

The PCA9671BS,118 is a direct functional replacement for the PCF8575. For applications requiring an interrupt output instead of a reset input, consider the PCA9673. The PCA9670 offers an 8-bit alternative for lower pin count requirements.