Device and method for ratiometric measurement of voltages for an analog-digital-converter

A device for ratiometric measurement of voltages and monitoring of at least one voltage for an analog-digital-converter, wherein the device comprises a functional providing unit, a microcontroller and a first sensor, wherein a reference voltage is provided to the microcontroller and a first supply voltage is provided to the first sensor and the microcontroller by the functional providing unit, and wherein the first sensor is connected to the microcontroller in terms of signaling by transmission of sensor signals, and wherein the microcontroller comprises a first multiplexer and a second multiplexer, wherein the multiplexers output signals to the analog-digital-converter, wherein:

• the reference voltage and the first supply voltage are connected to the input side of the first multiplexer and to the input side of the second multiplexer respectively, wherein the first multiplexer and the second multiplexer are arranged in parallel to each other on the input side with respect to the first supply voltage, and the first multiplexer and the second multiplexer are arranged parallel to each other on the input side with respect to the reference voltage, and wherein it is possible to measure the first supply voltage on the output side in a first switching state by using the reference voltage as a reference for the analog-digital-converter and to measure the reference voltage in a second switching state by using the first supply voltage as a reference for the analog-digital-converter without dividing the first supply voltage.