D.H.S. Digijock Home Security

1. D.H.S. Digijock Home Security ECE477 – Team 7: Linda Stefanutti Zach Smith Stuart Pulliam Will Granger

2. Summary: • Reliability and safety analysis: • Criticality • Components considered • Failure modes: • Causes • Effects Digijock Home Security

3. Components considered • Microcontroller (MC9S12) • Voltage translator (74LVC8T245) • Voltage regulators Digijock Home Security

4. Criticality • High criticality: detecting smoke • Medium: inability to activate alarm • Low: user inconvenience • Microcontroller: high • Voltage regulators: 1 high, 1 medium • Voltage translators: medium Digijock Home Security

5. Microcontroller • Predicted number of failures (λp) • C1 (die complexity): 0.12 (16-bit MOS MCU) • πT(temp coeff.) : 0.49 (45 degrees Celsius) • C2 (const) : 0.025 (hermetic SMT, < 60 pins) • πE (envir. const) : 2.0 (ground fixed) • πL (learning factor) : 1.0 (>2 years) • πQ(quality factor) : 10 (commercial grade) • λp = (C1xπT+C2xπe)xπqxπl = 1.088 failures/106 hours Digijock Home Security

6. Voltage translator • Predicted number of failures (λp) : • C1 (die complexity): .01 (digtl MOS <100 gates) • πT (temp coeff.) : 0.49 (45 degrees Celsius) • C2 (const) : 0.0087(hermetic SMT, 24 pins) • πE (envir. const) : 2.0 (ground fixed) • πL (learning factor) : 1.0 (>2 years) • πQ(quality factor) : 10 (commercial grade) • λp = (C1xπT+C2xπe)xπqxπl = 0.223 failures/106 hours Digijock Home Security

7. Voltage regulators • Classification: low frequency diode • Predicted number of failures (λp) • Λb(base failure rate) : 0.0020 (voltage reg) • πT(temp coeff.) : 1.5 (45 degrees Celsius) • πS(electrical stress factor) : 1.0 (voltage reg) • πC (contact constr. factor) : 1.0 (metalurgically bonded) • πQ(quality factor) : 6.0 (plastic) • πE (envir. const) : 6.0 (ground fixed) • λp = λbπTπSπCπQπE = 0.108 failures/106 hours Digijock Home Security

8. Failuremodes/ effects Digijock Home Security

9. Questions? Digijock Home Security