PCA9671D,112

I/o Expanders Overview

The PCA9671D,112 is a remote 16-bit I/O expander for the Fast-mode Plus (Fm+) I2C-bus and SMBus. It provides general-purpose expansion with 1 MHz interface speed, supporting PWM dimming and high drive capabilities. The device features latched outputs with 25 mA sink capability per pin and a total package sink capacity of 400 mA. Operating voltage ranges from 2.3 V to 5.5 V with 5.5 V tolerant I/Os. It includes an active LOW reset input, 64 programmable slave addresses via three address pins, and a readable device ID. The component operates within a temperature range of -40 °C to +85 °C.

I/o Expanders Feature Summary

• Supports 1 MHz I2C-bus interface speeds compliant with Fast-mode and Standard-mode protocols.
• Features latched quasi-bidirectional outputs capable of directly driving LEDs with 25 mA sink current per pin.
• Includes an active LOW hardware reset input and internal Power-On Reset for reliable initialization.
• Offers 64 programmable slave addresses using three address pins to minimize bus conflicts.

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 ordering suffix against the manufacturer's current production status. Confirm that the SO24 package variant matches the required board layout constraints. Ensure compatibility with the target system's I2C bus voltage levels and pull-up resistor configurations before finalizing procurement decisions.

I/o Expanders Selection Notes

Select this component when higher I2C bus speeds and greater drive currents are required compared to legacy expanders. The 1 MHz interface supports faster data throughput for applications like LED dimming. Consider the 400 mA total package sink capacity for designs requiring multiple high-current outputs simultaneously without external buffering.

I/o Expanders Part Context

The PCA9671 serves as a drop-in upgrade for the PCF8575, offering enhanced performance metrics. It replaces the interrupt output found in similar devices with a dedicated reset input. This evolution allows for more robust system control and higher bus drive capabilities, making it suitable for complex multi-device I2C networks.

I/o Expanders Replacement Considerations

The PCA9671 is designed as a functional replacement for the PCF8575. Designers should account for the difference between the PCA9671's reset input and the PCF8575's interrupt output when migrating existing circuit designs.