PCA9545AD.112 is a digital I2C switch from NXP that provides bidirectional level shifting switching for up to four I2C buses. It helps isolate one I2C bus from another and also enables bidirectional level-shifting operation when two buses require different logic levels, such as when two different voltage supplies are connected. The device has two operating latches with an active-low enable input for each of them for fast switching between buses. The device also has an independent I2C address for each of the four ports. Additionally, a Power-On Reset (POR) feature that automatically resets all control registers after a power cycle. PCA9545AD.112 is ideal for use in applications such as distributed sensor networks, networked data acquisition, and multi-master, multi- slave systems.