Pressure sensor for a fluid circuit or for a sealed enclosure of a motor vehicle

A pressure sensor for a fluid circuit or a sealed enclosure, in particular of a motor vehicle, the sensor comprising:

• an elastically deformable membrane comprising two opposite faces, one of which is intended to be in contact with a fluid,
• a resonant circuit of the RLC type comprising a capacitor which is located on one of the faces of the membrane, and whose capacitance varies as a function of the amplitude of elastic deformation of said membrane, and a first coil which is connected to said capacitor, said resonant circuit being configured to have a resonant frequency which varies as a function of the capacitance of the capacitor and therefore of the elastic deformation of the membrane, and
• a readout circuit offset from the membrane and comprising a second coil located opposite the first coil and configured to detect the resonant frequency of said resonant circuit and to emit a readout signal accordingly,
• characterised in that the capacitor comprises two electrodes which are connected respectively to the terminals of said first coil and which are both located on the face of the membrane so that they both follow the elastic deformation of the membrane, and in that said first coil is located on or above that face of the membrane.