Team 5 Reliability & Safety TCSP

High Criticality = λ < Low Criticality = λ < High Criticality determined by constant vehicular movement or unpredictable airsoft firing Block APower Block BMicrocontroller Block CMotors/Movement Block DSensor Block ECommunication Overview

Power Circuit

Failure NameFailure ModeCauseEffectsDetectionCriticality A13.3 V output = 0 V Capacitor Breakdown, MOSFET failure, Inductor breakdown, Max1791 failure, PCB Short Loss of circuit functionality ObservationLow A23.3 V output > 3.3 V Capacitor Breakdown, MOSFET failure, Inductor breakdown, Max1791 failure, PCB Short MCU damage, GPS module damage, component damage ObservationLow A3 3.3 V output out of tolerance Capacitor Breakdown, MOSFET failure, Inductor breakdown, Max1791 failure, PCB Short Unpredictable operation ObservationLow A45 V output = 0 V Capacitor Breakdown, MOSFET failure, Inductor breakdown, Max1791 failure, PCB Short Loss of SONAR functionality ObservationLow A55 V output > 5 V Capacitor Breakdown, MOSFET failure, Inductor breakdown, Max1791 failure, PCB Short SONAR damageObservationLow A6 5 V output out of tolerance Capacitor Breakdown, MOSFET failure, Inductor breakdown, Max1791 failure, PCB Short Unpredictable SONAR behavior ObservationLow

Microcontroller

Failure NameFailure ModeCauseEffectsDetectionCriticality B1 Outputs continuously Logic 0 Capacitor Breakdown, Crystal Distortion/Stalling, Failure A1, Failure A3, PCB Short, 9S12NE64 Failure Loss of circuit functionality ObservationLow B2 Outputs continuously Logic 1 Capacitor Breakdown, Failure A2, PCB Short, 9S12NE64 Failure Potential Irratic Movement and Airsoft Firing ObservationHigh B3 Unpredictable / Unstable Outputs Capacitor Breakdown, Crystal Distortion/Stalling, Failure A3, PCB Short, 9S12NE64 Failure Loss of circuit functionality ObservationLow

Motor/Movement Block

Failure NameFailure ModeCauseEffectsDetectionCriticality C1 Optoisolator output continuously 0 PCB Short, Resistor Failure, PS2501 (Opto- isolator) Failure, Failure B1, Failure B3 Loss of mobilityObservationLow C2 Optoisolator output continuously 1 PCB Short, Resistor Failure, PS2501 (Opto- isolator) Failure, Failure B2, Failure B3 Constant MovementObservationHigh C3 H-Bridge output continuously 0 V LMD18200 (H-Bridge) Failure, Failure C1 Loss of mobilityObservationLow C4 H-Bridge output continuously 9 V LMD18200 (H-Bridge) Failure, Failure C2 Constant MovementObservationHigh

Sensor Block

Failure NameFailure ModeCauseEffectsDetectionCriticality D1 Transistor Output to SONAR continuously 5 V MOSFET Failure, Failure A5, Failure B2 Loss of SONAR Functionality, Navigation errors ObservationLow D2 Transistor Output to SONAR continuously 0 V MOSFET Failure, Failure A4, Failure B1, Failure B3 Loss of SONAR Functionality, Navigation errors ObservationLow D3 Transistor Output to SONAR out of spec MOSFET Failure, Failure A6 Loss of SONAR Functionality, Navigation errors ObservationLow D4 Frequency to Voltage conversion output = Logic 0 LM2917 Failure, Capacitor Breakdown, Resistor Failure, External Input Voltage Out of Spec Loss of dead-reckoning ability, Navigation errors ObservationLow D5 Frequency to Voltage conversion output = Logic 1 LM2917 Failure, Capacitor Breakdown, Resistor Failure, External Input Voltage Out of Spec Loss of dead-reckoning ability, Navigation errors Observation, Possible Software Detection Low D6 GPS module not working GPS Module Failure, Failure A1, Failure A2, Failure A3, Failure B1, Failure B2, Failure B3 Loss of GPS navigation/waypoints, Product Failure Observation, Possible Software Detection Low D7 SONAR module not working SONAR Module Failure, Failure A4, Failure A5, Failure A6, Failure B1, Failure B2, Failure B3 Loss of Obstacle detection, Navigation errors Observation, Possible Software Detection Low

Communication Block

Failure NameFailure ModeCauseEffectsDetectionCriticality E1 Ethernet Doesn't Work 9S12NE64 Failure, RJ45 Magnetics Failure, PCB Short Loss of communcation to product, Product Failure ObservationLow E2 Serial Connection Doesn't Work RS232 Level Converter Failure, PCB Short, 9S12NE64 Failure No adverse EffectsObservationLow E3 Wireless Router Doesn't Work Router Failure, Power Connection Broken, Failure E1 Loss of communcation to product, Product Failure ObservationLow