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ISO7763: Device failure resulting in low impedance path from pin 16 to pin 9

Part Number: ISO7763

During varying steps of a manufacturing process & acceptance testing of a Printed Wiring Assembly, the behavior of an ISO7763FDBQR will permanently change from nominal to a low impedance path from VCC2 (pin 16) to GND2 (pin 9). This results in this design's VCC2 +5v power rail being pulled down to the GND2 rail. After the malfunction, VCC2 - to - GND2 impedance measures approximately 7ohms. What could be the failure mechanism inside the device that would result in the low impedance state? What are the likely causes of this behavior? I was unable to find a tech document that discussed this type of low impedance failure mode. Thanks.