Patent ID: 8701496

Claim:
A pressure sensor, the sensor comprising: a housing comprising a high side input port configured to allow a high pressure media to enter a high side of the interior of the housing and a low side input port configured to allow a low pressure media to enter a low side of the interior of the housing when the housing is placed in an environment containing the high pressure media and the low pressure media; a substrate securely mounted within the housing; a stress isolation member mounted to the substrate, wherein a channel extends from an end of the low side input port through the substrate and the stress isolation member, wherein at least one trace is embedded within the stress isolation member; a two layer die stack bonded to the stress isolation member, the two layer die stack comprising: a first sensor die, the first sensor die having a first recessed portion to form a first diaphragm having sensing circuitry formed on a circuitry side of the first sensor die opposite the recessed portion; a second sensor die, the second sensor die having a second recessed portion to form a second diaphragm, wherein a center post extends from the second diaphragm into the recessed portion; and at least one via extending through the first sensor die, the at least one via electrically connecting the sensing circuitry to the at least one trace; a low side atomic layer deposition applied to surfaces of the substrate, the stress isolation member and the two layer die stack that are exposed to the low side input port; and a high side atomic layer deposition applied to surfaces of the stress isolation member and the two layer die stack that are exposed to the high side input port.