PCF8575DGVR Integrated Circuits (ICs)

Due to market price fluctuations, if you need to purchase or consult the price. You can contact us or emial to us:   sales@allicdata.com

Interface - I/O Expanders are a class of hardware components that allow communication and control between two digital devices or a computer and a peripheral device. In this article, we will discuss the application field and working principle of a PCF8575DGVR, a type of I/O Expander.

PCF8575DGVR is a 16-bit I/O Expander, which can be used to expand the I/O port number of a microcontroller. It can provide 16 level input and output between a microcontroller and external peripherals, greatly expanding the number of interface pins of a microcontroller. By connecting the PCF8575DGVR to the microcontroller, users can easily configure it by setting the corresponding operating registers, and then control the device.

PCF8575DGVR has many application scenarios, including keyboard, display screen, sensor, etc. Keyboard: In order to increase the number of keys of the keyboard, the microcontroller needs to scan all the keys. For example, the pin number of a microcontroller may be limited to 10, while the number of keys on a keyboard is much more, even thousands. In this way, PCF8575DGVR can be used to expand the number of pins, thus the microcontroller can detect all the keys.

Display screen: In general, a display screen is composed of multiple pixels, each of which requires an interface port to control the brightness of the pixel or the color of the pixel. If the number of ports provided by the microcontroller is too small, PCF8575DGVR can also solve this problem. By connecting ports from the microcontroller to the PCF8575DGVR, the microcontroller can provide enough ports to control the display screen.

Sensor: Some sensors measure physical quantities like temperature, humidity and gas, and the I/O port numbers required by this kind of sensors are generally larger. In this case, PCF8575DGVR can also be used to expand the number of pins.

Now let\'s look at the working principle of PCF8575DGVR. The PCF8575DGVR is the I/O expander of the PCF8575 family. It provides 16 pins that can be separately used as input or output. It is controlled by two kinds of signals, one is the I2C serial bus which is used to transfer data and commands, the other is a chip select signal which is used to select the chip. The chip select is used to latch a start bit, thus it can be known that the specific transfer is aimed at which chip. The I2C serial bus is used to transfer data. By sending commands to PCF8575DGVR, users can control the PCF8575DGVR and then control runtime behaviors of other external peripherals.

In summary, the PCF8575DGVR is a type of I/O Expander which can effectively increase the number of interface pins from a microcontroller to external peripherals. Its working principle is based on I2C protocol and chip select signal, which enables users to control the PCF8575DGVR and further control other external peripherals.

The specific data is subject to PDF, and the above content is for reference