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Intermittent and catastrophic faults in electronic control systems can now be prevented with Ridgetop Group’s SJ BIST™. The SJ BIST (Solder Joint Built-In Self-Test) technology accurately detects and reports instances of high resistance, including intermittent opens, in field programmable gate arrays (FPGAs)-to-board interface.


  • Application:Interconnect
  • Sensor: SJ BIST/SMRT Connector/TSV BIST
  • Data Type: Pin Read/Write
  • Reasoner: DigIO
  • GUI: Sentinel Dashboard


Solder joint connections in ball grid array (BGA) packages are especially subject to cumulative fatigue damage. Prior to development of Ridgetop’s Solder Joint Built-in Self-Test™ (SJ BIST) product, there were no known methods for detecting intermittencies and high-resistance defects in functioning solder joint networks related to BGA packages. The cumulative damage eventually causes the solder joint to crack, usually at the package or printed circuit board (PCB) boundary.
SJ BIST is designed to detect static and dynamic occurrences of interconnect resistance increases and then alert the system regarding the condition of interconnect and related solder joints. Maintenance is thus facilitated, either through replacement or by switching to a redundant system prior to catastrophic failure. In addition to solder joint health monitoring, SJ BIST serves a wide range of applications where interconnect integrity and reliability are of concern.

Features & Benefits

  • Built-in Self-Test IP Core detects incipient fatigue damage to dedicated pins of IC packages, and BGA packages in particular
  • Supports interconnect reliability test and qualification
  • Detects damage prior to catastrophic failure of interconnect
  • Improves fault coverage without significantly increasing complexity of system
  • Improves fault coverage for advanced redundancy management without using redundancy techniques
  • Provides positive correlation of hardware faults to intermittencies


DigIO: A Power-Draw Anomaly Detection Method

Ridgetop’s DigIO™ (Digital Input/Output) product provides an innovative method for non-intrusively assessing the state of health (SoH) and remaining useful life (RUL) of complex digital electronic systems including CPU control boards. DigIO is a valuable tool for reducing maintenance costs and increasing operational readiness of digital-based systems. It has the potential to provide complex electronic modules with an advanced level of critical-component and system-SoH visibility with the real-time knowledge of components’ RUL.
The ability to detect impending failures in complex electronic systems supports condition-based maintenance (CBM) programs to reduce maintenance costs and increase operational readiness of advanced systems such as industrial internet communication links with factory floor robotic cells and other systems. The DigIO technology also has significant value for commercial applications including navigation and communications equipment (air, land, sea and space), digital processing, microprocessors (FPGAs), microcontrollers (MCUs), and computers.
DigIO employs an advanced correlation algorithm using a correlation method to detect anomalous conditions in the monitored asset. Basically, DigIO correlates the input bitstream to the digital products on the power bus of a digital-based system. If the digital system is operating within its specifications, there will be a high correlation between the input pseudorandom sequence (PRS) and the power supply noise; but if the digital system is degraded, the degree of correlation is reduced, with the degree of non-correlation increasing as degradation increases. The amount of degradation can be mapped in a fault-to-failure progression (FFP) model compatible with other Ridgetop analysis modules.
The DigIO utility leverages key technology parameters such as non-invasiveness, Weibull distribution data capture, intermittency detection, and most importantly, real-time system-level health visibility.
Today’s operators in the commercial aerospace market are plagued by ever-increasing operating and maintenance costs while facing tighter safety restrictions by the FAA. DigIO can be used as a dynamic utility for aircraft maintenance personnel to constantly monitor the RUL of critical aircraft components accurately and non-invasively, thus eliminating the need for the tedious line and system inspections which are performed routinely.