PCA9535DWG4

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PCA9535DWG4 belongs to the Interface - I/O Expanders. It can manage the extra inputs and outputs, transfer the data and receive the messages from external devices and systems. Additionally, this kind of Interface - I/O Expanders can intelligently control output pins of a microcontroller. This device can also work as a general purpose CPU for collecting the status report for making decisions, when the processor cannot perform the mission due to the limited processing capability.

The application field of this Interface - I/O Expanders is quite wide that including consumer electronics, communication equipment, home automation, office automation, automotive electronics and industrial applications. Especially, this device has great practicability in the intelligent electrical energy management.

The PCA9535DWG4 is an I2C device and works as a port expander to the main controller. The main controller can access the device by the two wire I2C interface and technically speaking, there can be 256 slave devices on the I2C bus. Furthermore, the device has sixteen general purpose I/O pins, and each of them can be configured as input or output. There are several function registers that are used to control the device’s I/O port, interrupt and power-down event.

The working principle of PCA9535DWG4 is simple and efficient. Firstly, the main controller communicates with the PCA9535DWG4\'s I2C interface with the right address and sends out specific command. Secondly, the status of the PCA9535DWG4\'s I/O ports will change. Thirdly, the changed status will be transferred to the main controller. The main controller can use this status to make decisions regarding with the future work.

There are four different types of interrupt outputs which are driven by the active input pins and they can be used to support different kinds of operations, such as controlling equipment, robots, and temperature or pressure measurement. When a certain pin’s status is changed, the interrupt output will send a signal to the main controller, then the controller take the proper actions.

In conclusion, the PCA9535DWG4 is a kind of Interface - I/O Expanders suitable for many applications such as consumer electronics, communication equipment, home automation, office automation, automotive electronics and industrial applications. It has an efficient two wire I2C Interface for communication between the main controller and the device, and can be configured as an input or output and each pin can be driven to an interrupt output.

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