Home Enhancement Suite Presenter: Allen Humphreys William Bouchonnet, Daniel Sabo, Nathan Irvin

Summary Definition of Design’s Criticality Levels Definition of Design’s Criticality Levels Components Under Consideration Components Under Consideration Failure Modes, Effects, and Criticality Analysis Failure Modes, Effects, and Criticality Analysis

PSSCs An ability to detect a user based on RFID and determine which user has priority, displaying the user's identity on an LCD. An ability to adjust the light intensity to match a user’s settings through X-10 protocol. An ability to adjust a television set or other HDMI device using CEC- HDMI protocol, to a user's preferred settings. (ON/OFF, Channel, Volume) An ability to unlock a door when an acceptable RFID is present. An ability to select/set preferred settings through an embedded web server and the ability to save the "light settings" with the press of a button.

Reliability & Safety Analysis

High Criticality High Criticality Potential Harm to User Potential Harm to User Medium Criticality Medium Criticality Irreparable Damage Irreparable Damage Low Criticality Low Criticality Inconvenience, single feature failure Inconvenience, single feature failure

Reliability & Safety Analysis Power Supply System Power Supply System Heat Heat Microcontroller System Microcontroller System Die Complexity Die Complexity Failure Rate C 1 =.56 for 32-bit µC Failure Rate C 1 =.56 for 32-bit µC Ethernet System Ethernet System Component Complexity Component Complexity 29 Passive Components 29 Passive Components

Power Supply

FMECA Analysis – Power Supply Failure No. Failure ModePossible CausesFailure EffectsMethod of Detection CriticalityRemarks A1Either Supply Output = 0V Failure to short circuit of any component in power supply Circuit inoperable ObservationMedium1A Fuse Protects Against Fire A25V Supply > 5VFailure of T1 or U9 Damage to U10, PLIX chip, RFID Reader ObservationMedium3.3V Supply Could Fail On This A33.3V Supply > 3.3V Failure of T1, U9, or U10 Potential damage to µC ObservationMedium A4Output out-of- tolerance Failure to open circuit of any component in power supply High ripple or out-of-spec operating voltage; Circuit Behavior Unpredictable ObservationMedium

Microcontroller

FMECA Analysis - Microcontroller Failure No.Failure ModePossible CausesFailure Effects Method of Detection CriticalityRemarks B1Lock Circuit Unknown R16, U3, SoftwareSecurity Breach ObservationHighPossible Injury by 3 rd Party B2Light FailureR14, U4, SoftwareLoss of Light Control ObservationLow B3Stuck in resetR6, S1, R5, C10, Software Micro will not operate ObservationMedium B4Receives < 3.3V Bypass Capacitors C3, C4, C5, C6, C8, C7 Short Micro will not operate, Unpredictabl e Outputs ObservationMedium

FMECA Analysis - Ethernet Failure No.Failure ModePossible Causes Failure Effects Method of Detection CriticalityRemarks C1External Oscillator Failure U8Ethernet Fails, µ C Fails ObservationMediumInteraction with µ C is unpredictable C2Noise Suppression Caps Fail C30, C29, C28, C31 No/Poor Ethernet Comm. ObservationLow C3Communicati on to µ C Fail R39 Open Circuit No EthernetObservationLow

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