Electronic Cornhole Team 7 Safety/Reliability Analysis Jimmy Tsao Tom Collopy Andrew Reder Ryan Scheckelhoff

Hardware Overview Power Supply  9.0VDC regulated input (.7 A max)  5.0VDC rail (LM2940 LDO linear regulator)  3.3VDC rail (TPS73633 LDO linear regulator) Microcontroller (MC9S12XD256)  Facilitates data flow (4 SCI, 5 GPIO) TI S4100 RFID Reader Module (x2) Free2Move Bluetooth Module (F2M03GLA) Vorne Industries LED Display (GY2200)

Critical Components Voltage Regulators (5.5V, 3.3V)  Chosen because of higher temperature operation than other components, failure could cause complete system shutdown or damage to other components  MTTF ~ 6.72 X 10^7 hours (5V – LM2940) Based on linear gate array model  MTTF ~ 2.0 X 10^7 hours (3.3V – TPS73633)  Based on linear gate array model

Critical Components Microcontroller (MC9S12XD512)  Chosen because of complexity, possibility of higher temperature operation than other components; failure could cause system shutdown  MTTF ~ 2.7 X 10^5 hours Based on VLSI CMOS model

FMECA (excerpt) Failure No.Failure ModePossible CausesFailure Effects Method of DetectionCriticalityRemarks A1 5V power supply LM2940 failure, shorted power supply output/input components No components will operate, possible excessive heat ObservationMediumNo injury likely possible, loss of functionality A2 5V power supply LM2940 failurePossible failure of micro, RFID and Bluetooth modules ObservationMediumNo injury likely possible, loss of functionality A3 5V power supply out of tolerance LM2940, C1, C2, C3, D1Unpredictable, high ripple voltage ObservationMediumNo injury likely possible, loss of functionality