Patent ID: 7077008

Claim:
A differential pressure sensor system, comprising: an absolute pressure sensor comprising a plurality of pressure sense die for detecting sensed media, wherein each of said plurality of pressure sense die possesses a back side and a front side and are respectively associated with a plurality of varying pressures; wherein said sensed media are applied only at said backside of said plurality of pressure sense die, thereby preventing wire bonds and active regions associated with said front side of said plurality of pressure sense die from exposure to sensed media and attack from acids and abrasive chemicals associated with said sensed media; at least one ASIC for automatically calibrating said plurality of pressure sense die, wherein said at least one ASIC comprises a high port ASIC in association with a reference port ASIC; an over-voltage and reverse polarity protection circuit that provides data as input to said high port ASIC and said reference port ASIC; a differential circuit associated with a pressure pulsation circuit, wherein said differential circuit receives as input, data transmitted from said high port ASIC; an output protection circuit which receives as input, data output from said differential circuit and said pressure pulsation circuit; and an EMC protection circuit, which receives as input, data output from said output protection circuit, wherein said EMC protection circuit outputs data which is fed as input to said over-voltage and reverse polarity protection circuit.