SLVSLJ5 March 2026 TCA9846
ADVANCE INFORMATION
A typical application of the TCA9846 contains one or more data pull-up voltages, VDPUX, one for the controller device (VDPUM) and one for each of the selectable target channels (VDPU0 – VDPU7). In the event where the controller device and all target devices operate at the same voltage, then VDPUM = VDPUX = VCC. In an application where voltage translation is necessary, additional design requirements must be considered to determine an appropriate VCC voltage.
The A0, A1 pins are hardware selectable to control the target address of the TCA9846. These pins may be tied directly to GND or VCC in the application.
If multiple target channels are activated simultaneously in the application, then the total IOL from SCL/SDA to GND on the controller side is the sum of the currents through all pull-up resistors, Rp.
The pass-gate transistors of the TCA9846 are constructed such that the VCC voltage can be used to limit the maximum voltage that is passed from one I2C bus to another.
In order for the TCA9846 to act as a voltage translator, the Vpass voltage must be equal to or lower than the lowest bus voltage.