Aufruf-Generator zur Verwendung mit einem Mehrstellen-Widerstandsleiterschalter

摘要

A wakeup generator for generating an interrupt pulse to a microcontroller (10) of an electronics module in response to a switch position change of a multi-position resistance ladder switch (14) to awaken the microcontroller (10) from a low power sleep mode. The wakeup generator uses a low current constant current source (18) and a detector(12). The low current constant current source (18) provides sense current for the switch (14) with a voltage developing across the switch varying according to the switch position selected with each switch position developing a different voltage. The detector detects a change in the voltage across the switch due to a switch position change and generates the interrupt pulse to the microcontroller.