A circuit module, in particular for use in a vehicle tire, having at least: a housing (2), a piezoelectric generator (3), which has a mass element (10) that is movable within the housing (2) and a spring device (12, 14), which has at least one piezoelectric element (14), the mass element (10) and the spring device (12, 14) forming an oscillatory system, and the piezoelectric element (14) being elastically deformable in response to the oscillation of the oscillatory system (10, 12, 14); and a current-supply circuit (5) for receiving a piezoelectric voltage output by the piezoelectric element (14) in response to the mechanical deformation thereof and for supplying power to the circuit module (1).