US Patent 7644349 Interface circuit

An interface circuit comprises at least one supply input and at least one data input with a protective circuit coupled between the at least one supply input and the at least one data input. A power supply circuit is coupled to the at least one supply input. The interface circuit further comprises an error detection circuit coupled to the supply input and to the at least one data input. The error detection circuit is designed to compare a supply signal applied to the supply input with a data signal applied to the at least one data input and to generate an error signal on the basis of the comparison result.