One useful application that takes advantage of the TMUX13xx-Q1 features is multiplexing various physical switches in a body control module (BCM) or electronic control unit (ECU). Automotive BCMs are complex systems designed to manage numerous functions such as lighting, door locks, windows, wipers, turn signals, and many more inputs. The BCM monitors these physical switches and controls power to various loads within the vehicle. A CMOS multiplexer can be used to multiplex the inputs and minimize the number of GPIO or ADC inputs needed by an onboard MCU. Figure 10-1 shows a typical BCM system using the TMUX1308-Q1 to multiplex system inputs.

Figure 10-1 Multiplexing BCM Inputs