SEMICONDUCTOR SENSOR DEVICE WITH METAL LID
A semiconductor sensor device is packaged using a lid in which one or more dies are mounted to a substrate within the lid housing and one or more other dies are mounted to the substrate outside of the lid housing. The dies located outside of the lid housing may be encapsulated in a molding compound. In one embodiment, the lid has a vent hole and an active region of a pressure-sensing die located inside the lid housing is covered by a pressure-sensitive gel that together enable ambient atmospheric pressure immediately outside the sensor device to reach the active region of the pressure-sensing die. The sensor device may also have one or more other types of sensor dies, such as an acceleration-sensing die, to form a multi-sensor device.
1 . A semiconductor sensor device, comprising:
a substrate;
a pressure-sensing die mounted to the substrate;
pressure-sensitive gel covering at least part of the pressure-sensing die;
a lid mounted to the substrate to form a housing for the gel-covered pressure-sensing die and having an opening that exposes the gel-covered pressure-sensing die to ambient atmospheric pressure outside the sensor device;
at least one other die mounted outside of the housing; and
molding compound encapsulating the at least one other die.
2 . The semiconductor sensor device of claim 1 , wherein the at least one other die is mounted to the substrate outside of the housing.
3 . The semiconductor sensor device of claim 2 , wherein the at least one other die comprises a second sensor die mounted directly to the substrate.
4 . The semiconductor sensor device of claim 1 , wherein the at least one other die comprises a second sensor die mounted to the substrate, and an Application Specific Integrated Circuit (ASIC) die mounted between the pressure-sensor die and the substrate.
5 . The semiconductor sensor device of claim 1 , wherein:
the at least one other die is mounted on top of the lid; and
the molding compound has an opening that exposes the gel-covered pressure-sensing die to the ambient atmospheric pressure outside of the molding compound.
6 . The semiconductor sensor device of claim 1 , further comprising:
an Application Specific Integrated Circuit (ASIC) die mounted between the pressure-sensing die and the substrate; and
bond wires electrically connecting the pressure-sensing die and the ASIC die, and the ASIC die and the substrate, and the at least one other die and the substrate.
7 . The semiconductor sensor device of claim 6 , wherein the pressure-sensitive gel covers the bond wires between the pressure-sensing die and the ASIC die.
8 . The semiconductor sensor device of claim 7 , wherein the pressure-sensitive gel does not cover the entire wire-bonding between the ASIC die and the substrate.
9 . The semiconductor sensor device of claim 1 , wherein:
the at least one other die comprises a second sensor die, and an Application Specific Integrated Circuit (ASIC) die mounted between the second sensor die and the substrate; and
wire-bonding between the second sensor die and the ASIC die, between the ASIC die and the substrate, and (iii) between the pressure-sensing die and the substrate.
10 . The semiconductor sensor device of claim 9 , wherein the molding compound encapsulates the entire wire-bonding between the second sensor die and the ASIC die, and between the ASIC die and the substrate.
11 . The semiconductor sensor device of claim 1 , wherein the lid has side walls that slant outward.
12 . The semiconductor sensor device of claim 1 , wherein the at least one other die comprises an acceleration sensor.
13 . The semiconductor sensor device of claim 1 , wherein:
the pressure-sensing die is mounted to an Application Specific Integrated Circuit (ASIC) die;
the ASIC die is mounted directly to the substrate inside the housing;
the pressure-sensitive gel covers (i) the pressure-sensing die, (ii) all of the wire-bonding between the pressure-sensing die and the ASIC die and (iii) part of the wire-bonding between the ASIC die and the substrate;
the at least one other die comprises a second sensor die mounted directly to the substrate outside of the housing; and
the molding compound encapsulates the second sensor die and is substantially as high as the lid.
14 . The semiconductor sensor device of claim 13 , wherein the second sensor die is an acceleration-sensing die.
15 . The semiconductor sensor device of claim 1 , wherein:
the pressure-sensing die is mounted to an Application Specific Integrated Circuit(ASIC) die;
the ASIC die is mounted directly to the substrate inside the housing;
the pressure-sensitive gel covers (i) the pressure-sensing die, (ii) all of the wire-bonding between the pressure-sensing die and the ASIC die and (iii) part of the wire-bonding between the ASIC die and the substrate;
the at least one other die comprises a second sensor die mounted on top of the lid outside of the housing; and
the molding compound encapsulates the second sensor die, is higher than the lid, and has an opening corresponding to the opening in the lid.
16 . The semiconductor sensor device of claim 15 , wherein the second sensor die is an acceleration-sensing die.
17 . The semiconductor sensor device of claim 1 , wherein:
the pressure-sensing die is mounted directly to the substrate;
the at least one other die comprises (i) a second sensor die and (ii) an Application Specific Integrated Circuit (ASIC) die mounted between the second sensor die and the substrate outside the housing;
the pressure-sensitive gel covers (i) the pressure-sensing die and (ii) part of the wire-bonding between the pressure-sensing die and the substrate; and
the molding compound encapsulates the second sensor die and the ASIC and is substantially as high as the lid.
18 . The semiconductor sensor device of claim 17 , wherein the second sensor die is an acceleration-sensing die.
19 . A semiconductor sensor device, comprising:
a substrate;
a controller die mounted to the substrate;
a pressure-sensing die mounted to a top surface of the controller die;
pressure-sensitive gel covering at least part of the pressure-sensing die;
a lid mounted to the substrate to form a housing for the controller die and the gel-covered pressure-sensing die, wherein the lid has an opening that exposes the gel-covered pressure-sensing die to ambient atmospheric pressure outside the sensor device;
a second sensor die mounted to the substrate outside of the housing; and
molding compound encapsulating the second sensor die, wherein the pressure sensing die and the second sensor die are in communication with the controller die.
20 . A semiconductor sensor device, comprising:
a substrate;
a controller die mounted to the substrate;
a pressure-sensing die mounted to a top surface of the controller die;
pressure-sensitive gel covering at least part of the pressure-sensing die;
a lid mounted to the substrate to form a housing for the controller die and the gel-covered pressure-sensing die, wherein the lid has an opening that exposes the gel-covered pressure-sensing die to ambient atmospheric pressure outside the sensor device;
a second sensor die mounted to an upper, outer surface of the lid, wherein the pressure sensing die and the second sensor die are in communication with the controller die.