ASIC Capping Unit for Micromechanical Sensor Stress Reduction
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Solution Overview
Problem
Micromechanical sensor devices face mechanical stress issues during assembly and packaging, which can influence sensor signals and increase manufacturing costs due to the need for separate cap elements and complex packaging processes.
Innovation Solution
Integrating an ASIC chip into the capping unit, which serves as protection for the micromechanical sensor chip, allowing for mechanical decoupling and minimizing signal interference, while using standard assembly processes like wire bonding and molding to reduce overall component dimensions and costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a separate cap element is used to protect the micromechanical sensor chip, then protection is improved, but device complexity and manufacturing cost increase
Solution Approach 1:
The ASIC chip is integrated into the capping unit by forming a recess in the ASIC chip that receives the micromechanical sensor chip, merging the protection function and electronic integration into a single component structure, thereby eliminating the need for a separate cap element
Solution Approach 2:
The ASIC chip serves multiple functions simultaneously: it provides electronic signal processing and also forms the capping unit that protects the sensor chip, demonstrating multi-functionality that reduces overall device complexity
2Ease of manufacture
If standard assembly processes are used, then manufacturing cost is reduced, but mechanical stress on sensor chip increases
Solution Approach 1:
The bonding process is segmented into two stages: first bonding the ASIC chip to the substrate, then bonding the sensor chip to the substrate, allowing stress distribution and minimizing mechanical stress on the sensor chip during assembly
Solution Approach 2:
The substrate serves as an intermediary element that facilitates standard assembly processes while protecting the sensor chip from direct mechanical stress during bonding operations
3Volume of moving object
If the ASIC chip is integrated into the capping unit, then device size is minimized, but manufacturing precision requirements increase
Solution Approach 1:
The recess is pre-formed in the ASIC chip before final assembly, allowing precise positioning and integration of the sensor chip into the capping unit, thereby minimizing overall device size while maintaining manufacturing precision
Data Source
AI summary
A micromechanical sensor device and a corresponding manufacturing method are described. The micromechanical sensor device is fitted with a substrate including a front side and a rear side; a micromechanical sensor chip including a sensor area attached to the front side of the substrate; and a capping unit attached to the front side of the substrate, which is formed at least partially by an ASIC chip. The capping unit surrounds the micromechanical sensor chip in such a way that a cavity closed toward the front side of the substrate is formed between the sensor area of the micromechanical sensor chip and the ASIC chip. A mold package is formed above the capping unit.