PCF8574ADWRG4

Series:	--
Packaging:	Tape & Reel (TR)
Part Status:	Obsolete
Number of I/O:	8
Interface:	I²C
Interrupt Output:	Yes
Features:	POR
Output Type:	Push-Pull
Current - Output Source/Sink:	1mA, 25mA
Clock Frequency:	100kHz
Voltage - Supply:	2.5 V ~ 6 V
Operating Temperature:	-40°C ~ 85°C
Mounting Type:	Surface Mount
Package / Case:	16-SOIC (0.295", 7.50mm Width)
Supplier Device Package:	16-SOIC
Base Part Number:	PCF8574A

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Introduction

I/O expanders are essential components of embedded systems, which allow devices to communicate data to and from other devices. The PCF8574ADWRG4 is a type of I/O expander and an example of a powerful I/O expanding technology. In this article, we will discuss the application field of the PCF8574ADWRG4 and its working principle.

Application Field

The PCF8574ADWRG4 is an 8-bit I/O expander with 8 output buffered I/O pins and is especially suitable for applications like remote I/O expansion with communication interface, which includes 5 V and 3.3 V systems. It has an operating voltage range of 2.4 V to 6.0 V and power-on reset, allowing for reliable power connections. The I/O pins are open drain and can sink up to 25 mA at VCC = 5 V and 12.5 mA at VCC = 3.3 V. This expander also offers support for multiple communication interfaces such as I2C, SPI, GPIO, and UART.The PCF8574ADWRG4 is designed to provide efficient and reliable I/O connectivity for small to medium-sized applications. It provides fast and reliable connection speeds which allow data communication to occur with no noticeable latency. It is very efficient power-wise, only drawing additional power when actively communicating data, and can operate at minimal power when idle. Furthermore, the PCF8574ADWRG4 is also highly reliable and durable due to its protection from electrostatic discharge. This protection makes it ideal for applications in harsh environments or heavy use, as it can handle voltage spikes without any damage. The PCF8574ADWRG4 is also designed to have low noise emissions, reducing the chances of interference.

Working Principle

The PCF8574ADWRG4 is a Master/slave type I/O expander and operates using either I2C or SPI communication protocol. In I2C mode, the PCF8574ADWRG4 is the slave and requires external pull-up resistors to connect the SCL and SDA lines to VCC until communication takes place. During communication, the master uses a 7-bit address to initialize communication and then reads and writes data in 8-bit bytes between the master and the slave.In SPI mode, the PCF8574ADWRG4 is the slave and is initialized by pulling the SS pin low. Data is then clocked in and out of the device through an 8-bit data frame, with the MSB sent first.The PCF8574ADWRG4 also has an interrupt pin, which allows an interrupt signal to be sent from the device to the microcontroller when there is a change on one of the input pins. The interrupt can be configured to trigger on either the rising edge or falling edge of the signal, depending on the application.

Conclusion

The PCF8574ADWRG4 is an I/O expander designed specifically for small to medium-sized applications. It is equipped with a variety of features which allow it to be used in a wide range of scenarios. The PCF8574ADWRG4 is designed to be power-efficient and reliable, making it the ideal choice for applications which require a consistent connection. Furthermore, its multiple communication interfaces and interrupt functions make the PCF8574ADWRG4 a versatile choice for any I/O expansion project.

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