The TMUX2889YBHEVM has two 3-pin headers to control the power supply connection, location C2 of the TMUX2889, and the control inputs, location A2.

1. Supply Header J2

   Header J2 connects the VDD pin to either the external power or to ground via a jumper. If Header J2 is not connected, then the devices supply is left floating. Figure 2-1 shows header J2.

   1. To connect to the external supply, short the J2-2 location on the header to J2-3. The VDD_EXT terminal is now supplying the device power.
   2. To connect to ground, short the J2-2 location on the header to J2-1. The device supply pin is now grounded.
   3. To leave the device supply pin floating, leave J2-2 unconnected and floating.
2. Control Header J7

   Header J7 connects the SEL pin to either the external power or ground via a jumper. If Header J7 is not connected, then the devices SEL pin are left floating.

   1. To connect to the external supply, short the J7-2 location on the header to J7-1. The VDD_EXT terminal is now connected to the devices SEL pin.
   2. To connect to ground, GND, short the J7-2 location on the header to J7-3. The device SEL pin is now grounded.
   3. Leaving J7-2 unconnected leaves the SEL pin floating. Doing this is not recommended as the device is in an unknown state.

Figure 2-1 Header J2 : J2-1(GND), J2-2(Connection to device VDD), J2-3 (VDD_EXT)

Figure 2-2 Header J7 : J7-1(VDD_EXT), J7-2(Connection to device SEL), J7-3 (GND)

The logic of headers J2(VDD) and J7(SEL) are shown at the top side of the TMUX2889YPHEVM.

Figure 2-3 TMUX2889YBHEVM Truth Table