Team 3 Humphrey's Treasure Chest Roy Scheck Tony Leichty Charles Lan Steve Kingsley

MIDI-Phone Project Description Convert real-time audio signal to equivalent MIDI stream Capabilities Instrument Tuning Sensitivity/Volume Control Note Feedback (units of Frequency)

Criticality Definition Low Improper results Ability to continue operation No damage Medium Disrupts operation No damage High Disrupts operation Potential for damage

Functional Blocks FUNCTION BLOCK A FUNCTION BLOCK C FUNCTION BLOCK B FUNCTION BLOCK D FUNCTION BLOCK E FUNCTION BLOCK F

Power Supply Failure No. Failure ModePossible CausesFailure EffectsMethod of Detection CriticalityRemarks A1Vcc = 0 VWall wart/USB cable disconnected, TPS76733 damaged, Capacitor failure The device will not activate ObservationMediumSystem will not function A2Vcc > 3.3 V or 5 V TPS76733 damagedThe device will cause other components to fail and eventually the system itself ObservationHighCould cause entire product to fail A3Exposure to maximum rating Wall wart/ USB cable faulty Voltage regulators will fail over time ObservationHighProduct will be limited to a shortened lifetime

Analog Circuit Failure No. Failure ModePossible CausesFailure EffectsMethod of Detection CriticalityRemarks B1No audio output Microphone fault, Amplifier fault or gain set too low, Digital Potentiometer open-fault, Filter fault or cutoff set too low The device will not output any data ObservationLowOperation will still continue B2Audio input exceeds expected value Amplifier fault or gain is set too high, Loud input by user Signal will be incorrectly analyzed ObservationLowThe signal will saturate but still remain safely below VCC B3Noisy signalFilter fault or cutoff set too high, External interference Signal will be incorrectly analyzed ObservationLowOperation will still continue

Microcontroller (DSP) Failure No. Failure ModePossible CausesFailure EffectsMethod of Detection CriticalityRemarks C1No power or improper power level Voltage regulator fault, bulk or bypass capacitor fault The device will cease operation ObservationMedium-HighPotential for damage if power level is high C2Incorrect output Software error, PIN damage or ESD MIDI conversion will be incorrect or non-existent ObservationMedium-HighESD and pin damage may damage system C3System sporadically resets Reset switch fault, Voltage regulator fault, Power connector fault System will restart ObservationMediumNo damage to system

Digital Potentiometer Failure No. Failure ModePossible CausesFailure EffectsMethod of Detection CriticalityRemarks D1No power or improper power level Voltage regulator fault, bulk or bypass capacitor fault The device will cease operation and retain a constant voltage ObservationLowPotentiometer may be damaged but will not cause damage to rest of system D2Incorrect output DSP fault, Software error, Digital potentiometer fault The volume will not operate correctly ObservationLowOperation will still continue

LCD Display Failure No. Failure ModePossible CausesFailure EffectsMethod of Detection CriticalityRemarks E1No power or improper power level Voltage regulator fault, bulk or bypass capacitor fault No display on the LCD ObservationLowLCD may be damaged but will not cause damage to rest of system E2Incorrect outputSoftware error, LCD fault LCD will display incorrect information ObservationLowLCD may be damaged but will not cause damage to rest of system

USB Controller Failure No. Failure ModePossible CausesFailure EffectsMethod of Detection CriticalityRemarks F1No power or improper power level Voltage regulator fault, bulk or bypass capacitor fault, USB connection falut The device will cease operation ObservationMediumSystem operation will cease F2Transmit errorSoftware error, DSP fault, USB cable fault MIDI conversion will be incorrect or non-existent ObservationMediumSystem operation will cease F3Receive errorSoftware error, DSP fault, USB cable fault, host computer fault Operation will pause until expected data is received ObservationMediumSystem operation will cease