Failure Failure Mode Possible Causes Failure Effects Method of Criticality Remarks No. Detection B1 Output = 0V Failure of power Lack of power to Observe Low Inconvenient to user supply circuit circuit components (capacitors, inductors, diodes) B2 Actual output > Failure of power Power MOSFETs Observation High Could destroy expected output supply circuit source 1A current components on board (either 3.3V or components constantly; could 5V) (capacitors, cause combustion inductors, diodes) B3 Output out of Failure of power Unpredictable Observation Medium Could overpower tolerance supply circuit output components or components components and (capacitors, cause them to function inductors, diodes) incorrectly Figure F-2: FMECA Table for Voltage Regulators Failure Failure Mode Possible Causes Failure Effects Method of Criticality Remarks No. Detection C1 Output Software; peripheral No output to Observation Low Inconvenient to user continuously 0 failures peripherals
Failure No. Failure Mode Possible Causes Failure Effects Method of Detection Criticality Remarks B1 Output = 0V Failure of power supply circuit components (capacitors, inductors, diodes) Lack of power to circuit Observe Low Inconvenient to user B2 Actual output > expected output (either 3.3V or 5V) Failure of power supply circuit components (capacitors, inductors, diodes) Power MOSFETs source 1A current constantly; could cause combustion Observation High Could destroy components on board B3 Output out of tolerance Failure of power supply circuit components (capacitors, inductors, diodes) Unpredictable output Observation Medium Could overpower components or components and cause them to function incorrectly Figure F-2: FMECA Table for Voltage Regulators Failure No. Failure Mode Possible Causes Failure Effects Method of Detection Criticality Remarks C1 Output continuously 0 Software; peripheral failures No output to peripherals Observation Low Inconvenient to user
hw15_team_20_final_report_x.docx