SCPS143G June 2009 – March 2021 PCA9548A
The PCA9548A is an 8-channel, bidirectional translating switch for I2C buses that supports Standard-Mode (100 kHz) and Fast-Mode (400 kHz) operation. The PCA9548A features I2C control using a single 8-bit control register in which each bit controls the enabling and disabling for one of the 8 switch channels of I2C data flow. Depending on the application, voltage translation of the I2C bus can also be achieved using the PCA9548A to allow 1.8-V, 2.5-V, or 3.3-V parts to communicate with 5-V parts. Additionally, in the event that communication on the I2C bus enters a fault state, the PCA9548A can be reset to resume normal operation using the RESET pin feature or by a power-on reset which results from cycling power to the device.