PCA9535PWG4

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The PCA9535PWG4 is an industry-standard integrated circuit (IC) that acts as an input/output (I/O) expander for general-purpose use with a variety of processors, microcontrollers, and embedded systems. It is part of the PCA family of products from NXP Semiconductors, a leading manufacturer of technology-specific integrated circuits.

Its primary function is to extend the range of I/Os available to the system. While a variety of NXP devices are available in this category, PCA9535PWG4 is the most commonly used one due its ease of use, reliability, and pricing. The PCA9535PWG4 has 16 I/Os, each of which can be configured as either an input or an output. An optional interrupt output is provided, which can be triggered when a specific input changes.

In addition, the PCA9535PWG4 can be programmed to be output steered mode, where the logic states of all outputs are determined by the state of a given input, or by setting a particular input logic threshold. It also offers up to 32 configurable addresses for connecting to other devices, allowing for multiple I/O expanders to be daisy-chained together. The PCA9535PWG4 is powered by a single +5V supply and is available in both commercial and industrial temperature ranges.

The PCA9535PWG4 can be used in a variety of applications, including control systems, signal monitoring, data acquisition, and process control. It is particularly well-suited to applications where a large number of I/O points are required, but where an expensive controller with many I/O lines might be overkill. It can also be used as a buffer between a microcontroller and external devices, protecting the microcontroller from damage caused by faulty devices.

The PCA9535PWG4 is a type of CMOS (Complementary Metal-Oxide Semiconductor) integrated circuit, and its logic is TTL/LVTTL (Transistor–Transistor Logic/Low Voltage Transistor–Transistor Logic) compatible. Its working principles are straightforward and simple. All I/Os are configured as either an input or an output and, if requested, an optional interrupt output is offered. Each output line has an associated open-drain output driver and an internal pull-up resistor.

When an output is set to a high level, its output driver is pulled ‘low’, enabling the internal pull-up resistor. When the output is set to a low level, its output driver is pulled ‘high’, disabling the internal pull-up resistor. If a ‘high’ input is connected to a line and an output connected to the same line is programmed ‘low’, the input will be delinked from the line and the output driver is in turn disabled.

The PCA9535PWG4 can be used with a wide range of interface communication standards, including, but not limited to, I2C and SPI. It is suitable for low-to-medium frequency applications such as data acquisition, digital IO expansion for intelligent instrumentation and industrial control systems, PWM motor control, or other digital control or monitoring apps. It is well suited for embedded systems, especially with its small size, low power consumption, and easy to use features. The NXP PCA9535PWG4 is an ideal choice for expanding user-specified I/O.

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