PCA9535PWR

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I/O expanders expand the number of available digital inputs, outputs and other peripherals for embedded systems and microcontrollers. The PCA9535PWR (IO-Link compatible) is a popular and versatile I/O expander designed by NXP Semiconductors. It is a low-cost, web-enabled input/output (I/O) and event control module, providing a cost-effective way to easily expand embedded systems. In this article, we will explain the application field and working principle of the PCA9535PWR.

Application Field

The PCA9535PWR is an ideal I/O expander for a wide variety of embedded applications. It features a 32-bit I/O port with 8-bit bidirectional ports, allowing for both inbound and outbound communication. It also includes two 16-bit Event Control Registers (ECRs) for event-driven I/O expansion. The device is controlled via a two-wire serial interface, which simplifies System on Chip (SoC) design, eliminates I/O pins and reduces board space requirements. The device is also compatible with NXP\'s IO-Link protocol for machine communications, allowing legacy devices to be seamlessly connected to new systems. This makes the PCA9535PWR ideal for industrial and home automation applications, wireless connected home monitoring and gateway solutions, and automotive and security systems.

Working Principle

The PCA9535PWR is a simple, inexpensive 8-bit programmable input/output (I/O) expander. It is designed to increase the versatility of embedded solutions that require additional ports. The PCA9535PWR operates on a 2 wire I2C bus, which allows the master device to control up to seven PCA9535PWR devices on the same bus, either as a master or slave. The device includes 128 8-bit registers, including 8 General-Purpose I/O (GPIO) registers and two Event Control Registers (ECRs).

The GPIO registers contain D0-D7 values, which can be set to input, output or interrupt mode. The ECRs allow the user to configure operations such as interrupting a microcontroller when an input is received. The device also includes an interrupt mask register which provides a way to mask out unwanted interrupts. The PCA9535PWR can be set to operate in active low mode, allowing logic low signals to be detected. The device logic is also immune to noise, as it has low input hysteresis. As such, the device can be used in environments with high levels of electrical noise.

Overall, the PCA9535PWR is a versatile input/output expander for embedded applications. It features a 32-bit I/O port with 8-bit bidirectional ports, two 16-bit Event Control Registers and an interrupt mask register. It also includes logic level noise immunity, making it suitable for noisy environments. The device is controlled via a two-wire serial interface, which simplifies SoC design and reduces board space requirements. It is also IO-Link compatible, making it ideal for industrial and home automation applications, wireless connected home monitoring and gateway solutions, and automotive and security systems.

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