The PCAL9535AHF,128 is a sophisticated I/O expander product from NXP Semiconductors, designed to provide a simple and efficient solution for expanding the input/output capabilities of microcontroller-based systems. This high-performance device is particularly well-suited for applications where additional I/Os are needed, and space or power constraints are a concern.

Key Features

• Interface: The PCAL9535AHF,128 operates via an I²C-bus/SMBus interface, supporting fast-mode Plus (Fm+) with up to 1 MHz clock frequency, making it ideal for high-speed data transfers and communication with a host controller.
• Channels: This I/O expander offers 16 I/O pins that can be configured as either inputs or outputs, providing significant flexibility for various applications.
• Interrupt Function: It includes an interrupt output which can be configured to reflect the status of the input ports, thereby enabling immediate response to input changes without the need to continuously poll the inputs.
• Voltage Range: The device operates over a wide supply voltage range from 2.3 V to 5.5 V, accommodating different logic levels and ensuring compatibility with most microcontrollers.
• Low Standby Current: Its low standby current makes it suitable for battery-powered devices where power conservation is critical.
• Additional Features: The PCAL9535AHF,128 includes features such as power-up logic state retention, ensuring predictable device behavior upon power cycling, and programmable polarity inversion registers to invert the polarity of the input port data.

Applications

The versatility of the PCAL9535AHF,128 makes it an excellent choice for a broad range of applications, including:

• Server motherboards and industrial PCs where I/O expansion is necessary due to a limited number of GPIOs on the main processor.
• Portable devices, such as mobile phones and tablets, where extending battery life and minimizing space usage are crucial.
• Consumer electronics, like smart home devices and gaming consoles, where additional buttons or LEDs require more I/O ports.

Package and Quality

The PCAL9535AHF,128 is offered in a TSSOP28 (Thin Shrink Small Outline Package) which provides a compact footprint for space-constrained applications. NXP is known for its commitment to quality, and this product is no exception, meeting stringent industry standards for performance and reliability.