Introducing the PCA9535 16-bit I/O Expander from NXP

The PCA9535 is a robust 16-bit I/O expander from the trusted semiconductor manufacturer, NXP Semiconductors. This versatile component is designed to provide additional I/O capabilities to microcontrollers over a two-wire bidirectional I²C-bus. The PCA9535 is a perfect solution for systems that require more I/O ports than what is available on the microcontroller, such as in industrial controls, servers, and personal electronics.

Featuring 16 I/O pins that can be individually set as inputs or outputs, the PCA9535 allows for a wide range of expansion possibilities. The inputs can be used to sense status changes or interrupt signals, while the outputs are capable of driving LEDs or other indicators. Each I/O port can be configured via software, providing flexibility and control over your device's functionality.

Key Features of the PCA9535:

• Low Standby Current: Ideal for battery-driven and power-sensitive applications due to its low power consumption.
• Operating Voltage Range: Supports a wide range of power supplies, from 2.3V to 5.5V, making it suitable for various logic levels and systems.
• High Noise Immunity: Inputs and outputs are designed to withstand electrostatic discharge and other transient noise events, ensuring reliable operation in harsh environments.
• Interrupt Output: An interrupt output signals the host microcontroller when an input state has changed, which is essential for event-driven applications.
• Software Reset: An onboard reset feature allows the device to be reset through I²C commands, simplifying software control and management.

The PCA9535 is also equipped with an internal power-on reset, ensuring that the I/O expander starts in a known state, which is crucial for system stability. Additionally, the device's built-in oscillator eliminates the need for external timing components, further simplifying design and reducing component count.

Whether you are designing a complex industrial system or a simple consumer gadget, the PCA9535 from NXP is an excellent choice to extend your I/O capabilities with reliability and ease of use. Its small footprint, available in both SO and TSSOP packages, ensures it can fit into space-constrained applications, making it a highly versatile component in your electronics design toolkit.