TMUX6612-Q1 can be used to expand the functionality of an EV Charging station to an additional connector or outlet that follows the same communication and hardware protocols (such as NACS and CCS1). The input signal is a ±12V differential, and requires the switch to have low R_ON and handle the full voltage range with minimal changes in resistance on a ±15V supply. For this application the 4 channel 1:1 switch is reconfigured into a 2 channel 2:1 by connecting D1 and D3 to outlet 1 then D2 and D4 to outlet 2. Then S1:S2 is shorted for differential Plus while S3:S4 is shorted for differential Minus. Shorting Sel1:Sel3 and Sel2:Sel4 allows for the device to be controlled with only two GPIOs. Sel1:Sel3 selects outlet 1 and Sel2:Sel4 selects outlet 2. This device can support 1.8V logic signals on the control input, allowing the device to interface with low logic controls of an FPGA or MCU. The TMUX6612-Q1 can be operated without any external components except for the supply decoupling capacitors. The select pins have an internal pull-down resistor to prevent floating input logic. The TMUX6612-Q1 supports asymmetric supply rails within a 40V differential, and down to 4.5V on the positive supply. For this design, the signal range must stay within the supply rails of the device and at or below 30V V_DS.

Figure 18-1 EV Charging Station Application