PCA9536D,112

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The PCA9536D,112 is an I/O Expander providing 4-bit port expander functionality with the output pins controlled through I2C bus interface. This component allows a simple and quick connection of four I/O pins to an electronic circuit. It features an input voltage range of 2.3-3.6V and its operating temperature range varies from -40°C to 125°C. This device comprises of a 4-bit input port and 4-bit output port, expander, general purpose I/O lines, data direction registers, registers, serial data input/output, I2C bus interface, and power-down control.

The primary application field of the PCA9536D,112 is to extend the system’s general-purpose I/O pins beyond the eight lines available on the processor. It is ideal for increasing the number of inputs and outputs or push button and switches, LEDs, and other indicators controlled using the bus-enabled system. This component is an interface between the processor, memory or assistance processor, or any other I2C-compatible device along with other I2C peripherals.

The working principle of the PCA9536D,112 is quite simple. The input and output pins are connected to the processor, memory, or assistance processor. As soon as the device is powered, it starts to actively monitor the I2C bus and waits to receive commands from the master device via the I2C bus. After receiving the commands, the 16-bit internal data registers determine if the ports will be set as input or output. After the request is acknowledged and data update is done, then the required port voltage is delivered to the port pins.

The PCA9536D,112 features a hardware reset pin that allows resetting of the device to the default states without any need for software or hard resets. This reset pin is active low and is user-selectable with any external reset circuitry. In addition, this device also has a three-state mode that allows the I2C outputs to be put in a high-impedance state. This helps in reducing power consumption as it disconnects the I2C peripheral from the I2C bus.

The device can be used in applications with host-driven protocols such as Modbus, CANopen, and DeviceNet. Furthermore, the resistor on the SO-8 package helps to reduce power consumption. The current consumption of the chip is reduced by programmers, reset signals, and self-displays on the device.

The PCA9536D,112 is an ideal choice for applications that require simple I/O expansion via the I2C bus. It is used in many industrial and consumer applications such as lighting controls, remote monitoring and control systems, HVAC equipment, automotive and healthcare devices, portable devices, security systems, and home automation.

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