Method for producing an integrated circuit pointed element comprising etching first and second etchable materials with a particular etchant to form an open crater in a projection

An integrated circuit, comprising:

• a mobile metallic piece in a housing formed in an interconnect region of the integrated circuit, the mobile metallic piece being movable inside an evolution zone of the housing in response to a gravitational force;
• walls defining the evolution zone of the housing, the walls being formed within multiple metallization levels of the interconnect region,
• the walls comprising a floor wall and a ceiling wall,
• wherein at least one of the floor wall and ceiling wall incorporate a pointed element directing its pointed region towards the mobile metallic piece, the pointed element delimiting an open crater in a concave part of a projection;
• a plurality of electrically conducting elements positioned at boundary points of the evolution zone and configured to create an electrical signal in response to movement of the mobile metallic piece at the plurality of electrically conducting elements;
• and
• a detector configured to detect the electrical signal.

An orientation detection system, comprising:

• an integrated circuit comprising
• a mobile metallic piece in a housing formed in an interconnect region of the integrated circuit, the mobile metallic piece being movable inside an evolution zone of the housing in response to a gravitational force;
• walls defining the evolution zone of the housing, the walls being formed within multiple metallization levels of the interconnect region,
• the walls comprising a floor wall and a ceiling wall,
• wherein at least one of the floor wall and ceiling wall incorporate a pointed element directing its pointed region towards the mobile metallic piece, the pointed element delimiting an open crater in a concave part of a projection;
• a plurality of electrically conducting elements positioned at boundary points of the evolution zone and configured to create an electrical signal in response to movement of the mobile metallic piece at the plurality of electrically conducting elements;
• and
• a detector configured to detect the electrical signal;
• and
• a logic circuit electrically coupled to the detector and configured to determine orientation information using the electrical signal.