PCA9541D/02,112

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The PCA9541D/02,112 is a highly specialized device with particular application fields and the principle of its working. It is a low voltage bidirectional I2C-bus and SMBus voltage-level translator with two-channel addressable switches. This device is designed primarily for the systems that require isolation from potential data bus conflicts which might arise from multiple master operation.

The PCA9541D/02,112 is a pin and package compatible device of the PCA9541A/01, which replaced it. The PCA9541D/02,112 allows a system designer to easily configure an I2C switching device to an I2C-bus with two independent addressable ICs as sources or sinks on the same bus. This solution is ideal in systems such as control networks, bus distribution designs, and multiple network interconnects.

The PCA9541D/02,112 acts as a two-channel bidirectional voltage level translator which can switch two I2C masters from one I2C-bus to the other. This device is designed to feature two independent bidirectional channels, each of which is accessible via a single I2C-compatible address. Each channel is isolated by separate control pins so that one channel cannot interfere with the other. This device offers a modular approach to I2C system design and a smooth migration path from PCA9541A/01, to PCA9541D/02,112.

The PCA9541D/02,112 enables the system designer to configure their chosen I2C switch without the limitations of traditional crosspoint switches which may require additional buffering logic to prevent bus contention. This device is also more power efficient than an equivalent opto-isolator solution. It lowers overall system power consumption and improves the noise immunity of the part by providing galvanically isolated power supply domains.

The PCA9541D/02,112 provides two independent selector pins on each channel to allow the designer to select between two I2C devices for each channel. Depending on the state of the selector pins, either the first or the second I2C device is available for communication on the I2C bus. Each channel is enabled and disabled by a single enable/disable pin, allowing the designer to control the bus activity on a per-channel basis.

The PCA9541D/02,112 works by using a logic-controlled voltage level shifter that provides a 3.3V and 5V bidirectional level shifting capability. If a channel is enabled, one side of the channel’s data path is connected to the 5V I2C bus, while the other side is connected to either the 3.3V or the 5V side of the I2C-bus, depending on the status of the select pin connection.

When the PCA9541D/02,112 is disabled, both data paths are disconnected from the I2C bus and the two ICs being connected are separated from the bus. This allows the two ICs to be seen as disconnected from each other and thus avoided from potential bus conflicts. The low voltage operation of the device ensures that no additional external components are needed for operation and that it can be used in any standard I2C-bus system.

The PCA9541D/02,112 is suitable for many application fields such as serial data ports for smart lighting, communication bus interconnects, and mobile-device switchable buses. Its bidirectional nature ensures that it can be used to switch between different voltage levels as well as providing electrically isolated switching between different I2C-buses.

In summary, the PCA9541D/02,112 is an excellent device for addressing I2C system requirements. It is a low voltage bidirectional I2C-bus and SMBus voltage-level translator with two-channel addressable switches ideal for communication bus interconnects and mobile-device switchable buses. It provides low power consumption, a modular approach to system design and smooth migration path from PCA9541A/01, which makes it the device of choice for I2C system designers.

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