Package for a differential pressure sensing die
First Claim
1. A package for receiving a differential pressure sensing die, the differential pressure sensing die comprising a semiconductor die having an integral diaphragm adapted to measure a differential pressure applied to opposing sides of the integral diaphragm, the package comprising:
- a first housing member configured to receive the differential pressure sensing die, the first housing member defining a chamber and supporting a first flexible diaphragm that divides the chamber into a first internal volume and a first fluid-fillable volume, the first fluid-fillable volume in fluid communication with a first side of the integral diaphragm of the differential pressure sensing die when the differential pressure sensing die is installed in the package;
at least one second housing member, the at least one second housing member defining a second chamber and supporting a second flexible diaphragm that divides the second chamber into a second internal volume and a second fluid-fillable volume, the second fluid-fillable volume in fluid communication with a second side of the integral diaphragm of the differential pressure sensing die when the differential pressure sensing die is installed in the package, wherein the first housing member and the at least one second housing member are configured to mate with one another to define a housing, the housing defining a first central portion in which the first housing member and the second housing member directly contact one another and a second central portion defining a third internal volume for receiving the differential pressure sensing die, the first housing member having a first internal port defined in a wall of the first housing member at the second central portion and the second housing member having a second internal port defined in a wall of the second housing member at the second central portion, the internal ports being arranged to mate with the pressure sensing die, the respective walls attached directly to the differential pressure sensing die when the differential pressure sensing die is received by the third internal volume, and wherein the first housing member supports the first flexible diaphragm and the second housing member supports the second flexible diaphragm independent of the first housing member when the first housing member and the second housing member are not mated;
a first port defined through a first wall of the first housing member, the first port in fluid communication with the first internal volume; and
a second port defined through a second wall of one of the at least one second housing members, the second port in fluid communication with the second internal volume, wherein the first port is configured to receive a first fluid at a first pressure and the second port is configured to receive a second fluid at a second pressure.
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Accused Products
Abstract
A differential pressure sensor includes a pressure sensing die comprising a semiconductor die, having a thinned portion forming a diaphragm. The diaphragm includes piezo-resistive elements that exhibit varying resistance based on force exerted on the diaphragm. A first support structure is bonded to a first surface of the semiconductor die, having an aperture defined through the support structure such that a first surface of the diaphragm is exposed through the aperture. A second support structure is bonded to the opposite side of the semiconductor die having an aperture aligned with the opposing side of the diaphragm. Electrical components in electrical communication with the piezo-resistive elements are arranged outside the region defined by the bond between the first and second support structures and the semiconductor die. An oil-filled volume may be defined between the semiconductor die and a harsh medium which transmits a fluid pressure to the die without the harsh medium contacting the die.
44 Citations
21 Claims
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1. A package for receiving a differential pressure sensing die, the differential pressure sensing die comprising a semiconductor die having an integral diaphragm adapted to measure a differential pressure applied to opposing sides of the integral diaphragm, the package comprising:
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a first housing member configured to receive the differential pressure sensing die, the first housing member defining a chamber and supporting a first flexible diaphragm that divides the chamber into a first internal volume and a first fluid-fillable volume, the first fluid-fillable volume in fluid communication with a first side of the integral diaphragm of the differential pressure sensing die when the differential pressure sensing die is installed in the package; at least one second housing member, the at least one second housing member defining a second chamber and supporting a second flexible diaphragm that divides the second chamber into a second internal volume and a second fluid-fillable volume, the second fluid-fillable volume in fluid communication with a second side of the integral diaphragm of the differential pressure sensing die when the differential pressure sensing die is installed in the package, wherein the first housing member and the at least one second housing member are configured to mate with one another to define a housing, the housing defining a first central portion in which the first housing member and the second housing member directly contact one another and a second central portion defining a third internal volume for receiving the differential pressure sensing die, the first housing member having a first internal port defined in a wall of the first housing member at the second central portion and the second housing member having a second internal port defined in a wall of the second housing member at the second central portion, the internal ports being arranged to mate with the pressure sensing die, the respective walls attached directly to the differential pressure sensing die when the differential pressure sensing die is received by the third internal volume, and wherein the first housing member supports the first flexible diaphragm and the second housing member supports the second flexible diaphragm independent of the first housing member when the first housing member and the second housing member are not mated; a first port defined through a first wall of the first housing member, the first port in fluid communication with the first internal volume; and a second port defined through a second wall of one of the at least one second housing members, the second port in fluid communication with the second internal volume, wherein the first port is configured to receive a first fluid at a first pressure and the second port is configured to receive a second fluid at a second pressure. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A package for receiving a differential pressure sensing die, the differential pressure sensing die comprising a semiconductor die having an integral diaphragm adapted to measure a differential pressure applied to opposing sides of the integral diaphragm, the package comprising:
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a housing, defined by a plurality of housing members, a first housing member of the plurality of housing members defining a first internal volume and a first fluid-fillable volume separated by a first flexible diaphragm supported by the first housing member and a second housing member of the plurality of housing members defining a second internal volume and a second fluid-fillable volume separated by a second flexible diaphragm supported by the second housing member, the housing defining a first central portion in which the first housing member and the second housing member directly contact one another and a second central portion defining a third internal volume between the first fluid-fillable volume and the second fluid-fillable volume configured to support and receive the differential pressure sensing die when the first housing member is mated with the second housing member, the first housing member having a first internal port defined in a wall of the first housing member at the second central portion and the second housing member having a second internal port defined in a wall of the second housing member at the second central portion, the internal ports being arranged to mate with the differential pressure sensing die, the respective walls attached directly to the differential pressure sensing die when the differential pressure sensing die is received by the third internal volume, and wherein the first housing member supports the first flexible diaphragm and the second housing member supports the second flexible diaphragm independent of the first housing member when the first housing member and the second housing member are not mated; a first port defined through a first wall of the first housing member, the first port in fluid communication with the first internal volume; a second port defined through a second wall of the second housing member, the second port in fluid communication with the second internal volume; and at least one electrical connection pin extending outward from the housing, and in electrical communication through a wall of the third internal volume for connection to a bond wire in electrical communication with a piezo-resistive element formed in a surface of the integral diaphragm. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19)
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20. A package for receiving a differential pressure sensing die, the differential pressure sensing die comprising a semiconductor die having an integral diaphragm adapted to measure a differential pressure applied to opposing sides of the integral diaphragm, the package comprising:
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a first housing member configured to receive the differential pressure sensing die; at least one second housing member, the first housing member and the at least one second housing member configured to mate with one another to define a housing, the housing having defined therein an interior volume for containing said differential pressure sensing die; a first port defined through a wall of said first housing member, said first port positioned to be aligned with an aperture defined in a first side of said differential pressure sensing die when said differential pressure sensing die is contained in said first housing member; and a second port defined through a wall of said second housing member, said second port positioned to be aligned with a second aperture defined in a second side of said differential pressure sensing die, opposite said first side, when said first housing member is mated with said second housing member; and wherein the first housing member and the second housing member are mated and form a longitudinal axis and the differential pressure sensing die is insertable into the package between the first housing member and the second housing member when the first housing member and the second housing member are mated, the differential pressure sensing die configured to be inserted into the package from a side of the package, perpendicular to the longitudinal axis. - View Dependent Claims (21)
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Specification