PCA9546AD,118

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PCA9546A is an I2C multiplexer used for communication with multiple I2C devices over a single 7-bit or 10-bit address bus. It is also known as a master-slave I2C switch or multi-master I2C multiplexer. The PCA9546A can help alleviate I2C bus congestion by providing an additional eight (8) I2C channel lines that can be shared between multiple I2C devices. It supports both 7-bit and 10-bit addressing and allows any of the eight channels to be enabled either directly or through an I2C-compatible control register.

The PCA9546A is suitable for a variety of applications including embedded systems, automotive systems, video equipment, medical equipment, communication equipment, security systems, and access control systems.

The PCA9546A has two 7-bit I2C-compatible control registers which can be used to control the multiplexer: The I2C Bus Address Register (IBAR) and the I2C Bus Control Register (IBAR). The IBAR contains eight (8) bits which correspond to the eight (8) I2C channels and one (1) additional bit used to flag the presence of an I2C device on a particular channel. The IBAR bit setting shows which I2C channel is currently enabled. The IBCR is an I2C-compatible control register that can be used to control the multiplexer by setting its 8-bit "enable" bits. The enable bits in the IBCR determine which I2C channel is currently enabled and also whether or not the multiplexer will respond to direct I2C messages.

The PCA9546A supports standard and fast I2C protocols. It can be used with any I2C-compatible device, allowing multiple of those devices to be accessed on the same bus (controlling up to 8 devices at the same time on one bus). It also allows the user to switch control between the I2C devices on the bus, or to drive multiple buses / busses simultaneously. Additionally, it supports hot swapping of any of the eight (8) I2C channel lines.

The PCA9546A has a low power consumption and a wide operating temperature range. It can operate at temperatures ranging from -40 to +85 degrees Celsius, and its maximum power consumption is 130mW (down to 12mW in standby mode). It also has excellent electrical characteristics, including maximum data rates of up to 400kHz, line spikes and noise immunity of up to 2V, and a built-in low-resistance current-limiting protection circuit.

In summary, the PCA9546A is an ideal device for applications that require multiple I2C devices to be accessed on the same bus, and it is a cost-effective solution for applications where I2C bus expansion is required. The device is well-suited for a variety of applications, and its features make it an excellent choice for applications that require excellent performance and reliability.

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