Mass Interconnect Digital I/O Architecture for Protected Continuity Testing
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Solution Overview
Problem
Verifying continuity between instruments and a mass interconnect is challenging due to potential misconnections and damage in rack-mounted systems, with existing Field Diagnostic Testers (FDTs) lacking robust protection against overvoltage and limited flexibility in testing various instrument types.
Innovation Solution
Implementing digital input and output capabilities on each pin of the mass interconnect, resistively coupled with shift registers and buffer stages, allowing software reconfiguration for real-time testing and protection against overvoltage, and supporting multiple instrument types without additional hardware.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If traditional Field Diagnostic Testers are used for continuity testing, then the testing can be performed, but the system lacks robust protection against overvoltage and has limited flexibility in testing various instrument types
Solution Approach 1:
The patent implements a universal testing architecture where each pin of the mass interconnect is equipped with reconfigurable digital input/output capabilities. These pins can be programmed through software to test different instrument types and configurations, eliminating the need for multiple specialized testers. The shift registers and buffer stages allow the same hardware to adapt to various testing scenarios, providing both versatility and protection against overvoltage through controlled impedance and buffering.
2Adaptability or versatility
If digital input and output capabilities are implemented on each pin with shift registers and buffer stages, then flexibility and protection are enhanced, but the device complexity increases
Solution Approach 1:
The patent introduces shift registers and buffer stages as intermediary components between the digital input/output pins and the mass interconnect. These intermediaries provide controlled impedance matching and signal buffering, which protects against overvoltage while enabling software reconfiguration. The buffer stages act as mediators that isolate the testing control logic from the potentially harsh external environment, providing both protection and flexibility without requiring complex protection circuits.
3Reliability
If resistive coupling is used for digital input and digital output, then protection against overvoltage is provided, but the impedance is larger than normal
Solution Approach 1:
The patent utilizes the larger impedance inherent in resistively coupled digital I/O by dynamically changing the operational parameters through software control. The system configures the digital pins to operate in different modes (input/output, high/low impedance) depending on the testing requirements. This parameter changing approach allows the system to accommodate the higher impedance without compromising signal integrity, as the testing protocols are adjusted to work optimally with the resistive coupling characteristics.
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
Ensures reliable continuity testing across various instruments, reduces failure points, and enhances testing flexibility by supporting multiple configurations and protecting against overvoltage without additional hardware.
Implementation Method 1
a digital output may be resistively coupled to the pin through a buffer stage
Data Source
AI summary
Efficient continuity testing for instruments connected to a mass interconnect. Digital input and output capabilities may be used on each pin of the mass interconnect to test a variety of input/output (I/O) types on a device under test. Each pin of the interconnect may connect to a respective corresponding digital input and digital output in the tester, with the digital input resistively coupled to the digital output. The connectivity of the pin to the digital input and the digital output, and the connectivity between the digital input and the digital output may be implemented with shift registers and a buffer stage, respectively. In some embodiments, the structure may be implemented through parallel I/O blocks, as in a complex programmable logic device (CPLD), field programmable gate array (FPGA), or microcontroller.