A fabrication method of a sheathed yarn includes the following steps: making a core run axially through a sheathing area; winding a sheathing fibre around the core in the sheathing area; and presenting a microelectronic chip fixed onto the core in the sheathing area. A polymer material is present between the microelectronic chip and the core when the sheathing step is performed. The polymer material creeps during the sheathing step to form a protective coating.

A fabrication method of a sheathed yarn includes the following steps: making a core run axially through a sheathing area; winding a sheathing fibre around the core in the sheathing area; and presenting a microelectronic chip fixed onto the core in the sheathing area. A polymer material is present between the microelectronic chip and the core when the sheathing step is performed. The polymer material creeps during the sheathing step to form a protective coating.