ON Semiconductor PCA9535ECDTR2G I/O Expander

The PCA9535ECDTR2G is a robust, low-voltage 16-bit I/O expander designed and manufactured by ON Semiconductor, a leader in energy-efficient innovations. This integrated circuit (IC) is an essential component for designers looking to increase the number of input/output ports in their microcontroller-based projects or systems, particularly when I/O pins are at a premium.

The PCA9535ECDTR2G operates over a wide voltage range from 2.3V to 5.5V, making it suitable for a variety of applications, including handheld devices, telecommunications, and industrial control systems. It communicates with the host controller via the I²C bus, a popular serial interface known for its simplicity and efficiency. This allows for easy cascading of multiple devices on the same bus without the need for complex wiring or additional hardware.

Each of the 16 I/O ports on the PCA9535ECDTR2G can be independently configured as either an input or an output, giving designers the flexibility to tailor the device to their specific needs. The outputs are capable of driving LED indicators directly, and each I/O can be inverted if required, which is useful for adapting to different logic level requirements.

To ensure reliable performance, the PCA9535ECDTR2G features built-in power-on reset and low standby current, making it an energy-efficient choice for battery-operated devices. Additionally, it offers an interrupt output which can be connected to the host microcontroller's interrupt input to signal a change in the input state, thus allowing for efficient software polling.

The device comes in a TSSOP package, which is ideal for space-constrained applications. The PCA9535ECDTR2G is also designed to prevent bus lock-up by incorporating hardware noise filter on the SCL/SDA inputs, and it supports hot insertion. These features make the PCA9535ECDTR2G a reliable, versatile, and user-friendly choice for expanding I/O capabilities in a wide range of electronic systems.

With its combination of flexibility, ease of use, and ON Semiconductor's reputation for quality, the PCA9535ECDTR2G is an excellent choice for designers looking to add more I/O ports to their systems without increasing complexity or cost.