Semiconductor Package Debug Interface Using Backside Die Pads
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Solution Overview
Problem
Integrated circuit devices face limitations in debugging capabilities due to low pin count packages, which restrict the use of internal debug circuitry and often require shared pins with application I/O signals, leading to compromised debugging functionality and space constraints with larger pin count debug packages.
Innovation Solution
The solution involves fabricating debug circuitry on the semiconductor die with electrical connections to a lead frame structure, using an insulating adhesive to isolate the die from the package substrate, and forming encapsulating material to isolate debug circuitry from functional circuitry interfaces, allowing multiple debug interfaces without increasing the device footprint or pin count, utilizing a lead frame pad as a bidirectional interface for debugging.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a low pin count package is used, then cost and size constraints are satisfied, but debugging capability is restricted due to insufficient pins for internal debug circuitry
Solution Approach 1:
The patent utilizes the underside surface of the semiconductor die (a different dimension/space) to provide additional contact pads for debug circuitry. By moving the debug interface to the backside of the die rather than competing for pins on the front side, the invention enables multiple debug signals without increasing the pin count on the package substrate, effectively resolving the contradiction between low pin count and debugging capability.
2Device complexity
If shared pins are used for both debugging and application I/O signals, then pin count is reduced, but the functionality of application I/O signals cannot be debugged simultaneously
Solution Approach 1:
The patent segments the contact pads into two distinct groups: front side contact pads for application I/O signals and back side contact pads for debug circuitry. This physical segmentation allows independent use of each group, enabling simultaneous debugging and application I/O operations without functional conflicts, while still maintaining a low overall pin count package structure.
3Adaptability or versatility
If a larger pin count debug package is used, then debugging capability is improved, but space constraints are violated due to the need for adaptors
Solution Approach 1:
The patent makes the semiconductor die itself multi-functional by incorporating both application I/O contact pads on the front side and debug contact pads on the back side. This universal design allows the same die to serve both application and debugging functions simultaneously without requiring a separate debug package or adaptor, thereby improving debugging capability while maintaining the original device footprint.
4Adaptability or versatility
If additional debug pins are provided, then internal debug circuitry can be supported, but cost increases due to higher pin count packages
Solution Approach 1:
The patent resolves the cost vs. debugging capability contradiction by utilizing the backside of the semiconductor die to provide additional contact pads for debug circuitry. This approach adds debugging functionality without increasing the pin count on the package substrate, avoiding the need for more expensive high-pin-count packages while still supporting comprehensive internal debug circuitry.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach enables effective debugging with multiple interfaces without increasing the pin count or device footprint, allowing for internal code monitoring and profiling without interfering with functional circuitry operations, and supports heat transfer, thus enhancing debugging capabilities without adaptors.
Implementation Method 1
The opposing side of the semiconductor die that is mounted to the package substrate is affixed or otherwise joined using an insulating adhesive material that electrically isolates or insulates the die from the package substrate.
Implementation Method 2
An encapsulating material may also be formed overlying the semiconductor die and the package substrate, and the encapsulating material may physically and electrically isolate the debug circuitry from the package interfaces to be used for the functional circuitry.
Data Source
AI summary
Electronic device packages and related fabrication methods are provided. An exemplary electronic device includes a semiconductor die having debug circuitry fabricated thereon, a framing structure including an interior portion having the semiconductor die mounted thereto, and a conductive element providing an electrical connection between the interior portion and a contact pad on the semiconductor die that corresponds or is otherwise coupled to an interface of the debug circuitry.