Circuit/System Description

The head-up display switch is a multiplexed switch. The head-up display provides the head-up display switch with a low reference. The switch input to the head-up display is pulled low when a switch is activated. The head-up display switch is a momentary contact switch that connects a series of resistors in a resistor ladder format. The head-up display determines the switch pressed by the voltage drop across the resistors. Each switch state PAGE, UP, DOWN corresponds to a certain resistance value.