PCAL6524EVJ

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The PCAL6524EVJ, which is part of the PCAL family of I/O expanders, serves as a reliable and versatile interface between 3V and 5V systems, making communication between those systems possible. It is ideal for applications requiring a wide range of input/output (I/O) expansion while consuming minimal power.

The PCAL6524EVJ is an I/O expander that is capable of providing additional I/O pins for microprocessors with very few input/output pins. It operates in either 3V or 5V logic voltage levels and offers flexibility for a variety of applications. For example, it can be used to interface 3V microprocessors to 5V circuits in an embedded system, or to connect two different logic families with different logic voltages. It is also suitable for simple tasks such as driving keypads or LEDs.

Application Field

The PCAL6524EVJ has many applications in industrial, automotive, medical and consumer device manufacturing. In particular, it is ideal for applications such as digital input/output expansion, general-purpose switching and controlling, and LCD interface applications. It is also commonly used for adding auxiliary I/O pins to microcontrollers, LCDs, or off-board sensors.

Working Principle

The PCAL6524EVJ is a SPI/I2C interface I/O Expanders. It is designed to work in either 3V or 5V logic operation, and offers 24 open-drain I/Os for general-purpose input/output control. The I/Os of the I/O expander are controlled from one output port (PCAL/SPI mode) or two output ports (I2C mode). It accepts input from a 3V or 5V microcontroller. The device also includes a configurable high impedance interrupt that monitors activity on up to 17 I/O pins, allowing the microcontroller to be interrupted only when the selected pins match specific conditions.

The PCAL6524EVJ supports various configurations, such as the pull-up or pull-down resistors and LED brightness control. The I/O pin level can be set to either 3V or 5V logic, and a low-voltage reset I/O pin (LVR) is also provided. In SPI/I2C modes, all 24 pins can be configured as digital inputs, digital outputs, and analog inputs.

The PCAL6524EVJ offers flexibility and is suitable for many applications. Its I/O expanders are designed to be used in both low power and high performance applications, and offer low voltage operation ideal for embedded system designs.

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