PCA9515AD/G-T

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PCA9515AD/G-T is an integrated circuit (IC) designed to provide an isolated I2C-bus interface in multiplexed and long distance communications. Signal buffering, repeater, and splitter capability is provided for I2C communication interface, which makes it a suitable component for both simple and more complex bus systems.

The PCA9515AD/G-T uses two distinct voltage levels to define the “high” and “low” states. A logic “high” state is reached when the voltage is greater than VCC/2 while a logic “low” state is when the voltage is below VCC/2. The PCA9515AD/G-T is capable of conversion between two logic voltage levels, producing “pass-through” functionality by enabling the I2C communication between two devices.

Application field

The primary application for the PCA9515AD/G-T is in multi-device or long distance I2C networked applications. The PCA9515AD/G-T is ideal for isolating devices from each other, to prevent parasitic currents from flowing between them. It is particularly useful for applications involving sensitive technologies, where additional shielding may be necessary.

The PCA9515AD/G-T also provides the functionality of a bidirectional, mechanical isolator. This makes the device suitable for applications that require the physical isolation of two devices, while still allowing bidirectional communication. Additionally, due to its low power consumption and wide operating temperature range, the PCA9515AD/G-T can be used in both high temperature and low temperature applications.

The PCA9515AD/G-T is also suitable for applications that require an isolated SPI (Serial Peripheral Interface) bus. By using the PCA9515AD/G-T, two SPI-devices can be isolated from each other on the same bus and still communicate bidirectionally.

Working Principle

The PCA9515AD/G-T isolates devices connected to a common I2C bus with its bidirectional logic level translator circuit. The I2C bus is internally pulled up to VCC using the R1 and R2 resistors. This setup is known as the open-drain configuration, and is the most commonly used method to connect devices to a common I2C bus.

The logic level translator is enabled when operating in either the direction of the “high” or “low” logic level. The I2C messages pass through the logic level translator, allowing the two devices to communicate bidirectionally through an isolated pathway, before the signal is passed back to the receiver on the other side of the device. With this configuration, the PCA9515AD/G-T is able to provide an isolated pathway for I2C communication.

The PCA9515AD/G-T is also capable of working with multiple devices, as it provides signal buffering and repeater functions for the I2C bus. These functions allow the I2C bus to be extended, as well as to control the signal integrity. The PCA9515AD/G-T also provides signal splitting, which allows two devices to be connected to one I2C bus, while isolating the two devices.

In summary, the PCA9515AD/G-T is an integrated IC designed to provide an isolated I2C-bus interface, buffering, repeater, and splitter functions in multiplexed and long distance communications. The primary application is in multi-device and long distance networked applications. It is suitable for applications that require the physical isolation of two devices, and can also be used to extend the reach of an I2C bus and control signal integrity.

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