PCA9534ADB

Series:	--
Packaging:	Tube
Lead Free Status / RoHS Status:	--
Part Status:	Active
Moisture Sensitivity Level (MSL):	--
Number of I/O:	8
Interface:	I²C, SMBus
Interrupt Output:	Yes
Features:	POR
Output Type:	Push-Pull
Current - Output Source/Sink:	10mA, 25mA
Clock Frequency:	400kHz
Voltage - Supply:	2.3 V ~ 5.5 V
Operating Temperature:	-40°C ~ 85°C
Mounting Type:	Surface Mount
Package / Case:	16-SSOP (0.209", 5.30mm Width)
Supplier Device Package:	16-SSOP
Base Part Number:	PCA9534A

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Introduction

The PCA9534ADB is an I/O expander device designed by NXP to support systems requiring high-density I/O expansion. This is the first device of its kind to combine both port extenders and interrupts on the same chip. It provides an easy, cost-effective way to increase the number of I/O pins available on a system while also reducing the amount of wiring required. The device connects to the microcontroller via a two-wire serial bus and includes four user-programmable port extenders, an interrupt-on-change flag, and a few other features. This article will discuss the application fields and working principles of PCA9534ADB.

Application Fields

The PCA9534ADB can be applied in various systems needing extended I/O capabilities. It is primarily designed for automotive systems, such as airbags and lighting, as well as consumer devices, industrial equipment and medical devices. The device could be used to add just a few extra I/O pins for a system to control a complex network of actuators, sensors, and other peripherals. The chip is also convenient for use in low-power applications, where low-power consumption is essential. For example, the PCA9534ADB supports open drain and pull-up resistive load I/O pins, which keeps the device leakage current to a minimum. In addition, the device has several other power saving features such as dynamic I/O port disable and low standby current.

Working Principle

The PCA9534ADB works by mapping external I/O pins or interrupts onto four user-defined port extenders. Each port extender consists of two 8-bit registers, an output register and an input register. The output register holds the 8-bit pattern that will be outputted to the external device while the input register holds the 8-bit pattern from the external device. To write the 8-bit patterns to the output register, a write command is sent to the PCA9534ADB via the two-wire serial bus. The write command consists of an 8-bit address followed by an 8-bit data byte. The 8-bit address specifies which register is to be written to and the 8-bit data byte specifies the 8-bit pattern that is to be written to the register. The write command can also be used to configure the device’s internal registers. To read from the input register, a read command is sent to the PCA9534ADB via the two-wire serial bus. The read command consists of an 8-bit address followed by an 8-bit data byte. The 8-bit address specifies which register is to be read and the 8-bit data byte specifies the 8-bit pattern that is to be read from the register. The PCA9534ADB also includes an interrupt-on-change flag. This flag is used to indicate to the microcontroller when an interrupt has been triggered. The interrupt-on-change flag is set when the input port on the PCA9534ADB senses a change in the input data of any port extender. The interrupt can be cleared by writing a zero to the interrupt flag register.

Conclusion

The PCA9534ADB is a useful I/O expander device designed by NXP that is ideal for automotive, consumer, industrial and medical applications. It combines port extenders and an interrupt-on-change flag that can be used to control a complex network of peripherals. The device works by mapping external I/O pins or interrupts onto four user-defined port extenders and supports a two-wire serial bus communication interface. The PCA9534ADB is convenient for use in low-power applications, as it features power saving features such as dynamic I/O port disable and low standby current.

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