Method and system for manufacturing a sensor by means of marks and markings, and corresponding sensor

A method for manufacturing a sensor for motor vehicles, said sensor comprising a leadframe, an integrated circuit and a magnetic element, said leadframe having a support zone for said integrated circuit and a plurality of branches constituting electrical tracks, said branches comprising at least one positioning reference system, the integrated circuit comprising at least one measurement cell, said magnetic element being mounted in the electromagnetic proximity of the at least one measurement cell, said method comprising:

• placing the integrated circuit on the support zone of the leadframe formed in a metal baseplate,
• electrically connecting the integrated circuit to the branches of the leadframe,
• placing a camera facing the leadframe so as to generate a sequence of images showing the at least one positioning reference system and the at least one measurement cell or the integrated circuit,
• detecting the at least one measurement cell or the integrated circuit in the images generated by the camera,
• determining the position of the at least one measurement cell or the integrated circuit relative to the at least one positioning reference system,
• applying a first marking to the baseplate, said first marking indicating said determined position,
• overmolding the assembly formed by the support zone and the integrated circuit, with the at least one positioning reference system still being visible,
• positioning the magnetic element in the electromagnetic proximity of the at least one measurement cell,
• detecting the magnetic element in the images generated by the camera,
• determining the position of the magnetic element relative to the at least one positioning reference system, and
• applying a second marking to the sensor, said second marking indicating said determined position.