Product Overview: NXP PCF8574TS/3

The NXP PCF8574TS/3 is a robust I/O expander that offers a seamless solution for expanding the input/output capabilities of microcontrollers and microprocessors. Designed by NXP Semiconductors, a leader in the field, this device operates as an interface between the parallel data bus of a microcontroller and serial I2C-bus, ensuring efficient communication and control.

Key Features

• I2C Interface: The PCF8574TS/3 utilizes the I2C-bus interface, allowing for easy serial communication with a host controller using only two bidirectional lines, SDA (Serial Data Line) and SCL (Serial Clock Line).
• 8-bit Remote I/O Ports: This device provides an additional 8-bit I/O that can be used as either inputs or outputs. This flexibility allows for a variety of peripheral devices to be controlled, without the need for additional pins on the microcontroller.
• Addressing: Up to eight PCF8574TS/3 devices can share the same I2C-bus, thanks to the three hardware address pins that allow for multiple devices to be addressed uniquely.
• Interrupt Output: An interrupt output is provided, which can be configured to alert the host microcontroller of changes in the input port, thereby reducing the need for constant polling and enabling efficient power management.
• Low Standby Current: Designed for power-sensitive applications, the PCF8574TS/3 features a low standby current, making it suitable for battery-powered devices.

Applications

The PCF8574TS/3 is versatile and can be used in a wide range of applications, including:

• Industrial control systems
• Robotics
• Sensor networks
• Home automation systems
• Extended keyboard input

Technical Specifications

The device is housed in an SO16 package and operates over a supply voltage range of 2.5V to 6V. It is compatible with standard I2C-bus protocols and can operate at clock frequencies up to 100 kHz (Standard-mode) or 400 kHz (Fast-mode).

Conclusion

With its ability to expand I/O without increasing the footprint of a microcontroller, the NXP PCF8574TS/3 is an ideal choice for designers looking to enhance the functionality of their systems without compromising on space or power consumption.