PCA9698DGG,518

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Introduction

PCA9698DGG, 518 is a 2×16 I/O expander device from NXP Semiconductors. Specifically designed to expand board level I/O, it is the perfect solution for extending any system’s reach of connections in, for example, the automotive, industrial, and audio/video markets. This article provides a comprehensive overview of the potential applications and working principles of this piece of valuable equipment.

Application Field

The PCA9698DGG, 518 I/O expander provides an easy and cost-effective way of increasing the input/output capabilities of application architectures, such as digital bus systems. For instance, up to 128 I/O ports can be added to an application system with just two of these expanders, while at the same time they are still capable of achieving high speeds and low power consumption. Furthermore, the PCA9698DGG, 518 I/O expander\'s level shifting and open-drain drive technology allows communication with various voltage standards, such as 3V and 5V. Therefore, they are especially suitable for automotive and industrial applications, which tend to have various voltage levels.Another merit of the PCA9698DGG, 518 expander is the two independent address select pins (A2, A1) which allow the system to drive up to 8 expander devices autonomously. All this makes this I/O expander highly adaptable and effective for applications such as remote sensing systems and audio/video systems.

Working Principle

The PCA9698DGG, 518 I/O expander works on the basis of the two-wire I2C bus serial protocol. This allows two or more devices to communicate without the need of an external processing unit and data line. The system has the capacity of running speed up to 400kbps, allowing fast data transfer and reliable communication. Thanks to its open-drain drive technology, it only requires one of the devices to have the I2C bus line pulled up (3V3 or 5V). Also, it is important to understand that the logical state of PCA9698DGG, 518 I/O expander is set by its internal states, this is why the external logic regulating the logic state needs to be set by its internal logic, settings that can be set in either registers or pins as required. Finally, each input port can sense logic signals ranging from 0V to VCC, depending on the configuration. It is important to keep in mind that the inputs of this piece of equipment need to be pulled up in order to establish the desired logic state.

Conclusion

As explained above, the PCA9698DGG, 518 I/O expander is an extremely useful piece of equipment. Suitable for various applications, this I/O expander is a cost-effective solution for expanding board level I/O. Additionally, it works on the two-wire I2C serial protocol, with the potential of achieving communication speeds of up to 400kbps. The PCA9698DGG, 518 expander provides a reliable and efficient way of controlling digital systems.

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