Team 3

Piano GloveReliability and Safety Analysis

Carolyn McMicanDaniel Stein

Jonathan KuntzmanMihir Shah

Reliability Analysis - Overview

4 main components considered Glove Micro - PIC24FJ128GA310 Base Micro - PIC18F87K90 3.3V Power Supply - CC3-0503SR-E 5V Power Supply - VEFT1-SMT

Glove Micro - PIC24FJ128GA310

Parameter name

Description Value Comments

C1 Die Complexity Failure Rate

0.28 16 bit device

πT Temperature Factor

0.24 Assume max current draw for power dissipation

C2 Package Failure Rate

0.025 Assumed Hermetic SMT package, 64 pins

πQ Quality Factor 10 Commercial grade parts

πE Environmental Factor

2.0 Assume environment is ground, fixed Gf

πL Learning Factor 1.0 >2 Yrs in production

Entire design: 1.172

Base Micro - PIC18F87K90Parameter name

Description Value Comments

C1 Die Complexity Failure Rate

0.14 8 bit device

πT Temperature Factor

0.24 Assume max current draw for power dissipation

C2 Package Failure Rate

0.032 Assumed Hermetic SMT package, 80 pins

πQ Quality Factor 10 Commercial grade partsπE Environmental

Factor2.0 Assume environment is

ground, fixed GfπL Learning Factor 1.0 >2 Yrs in productionEntire design: 0.976

3.3V Power Supply - CC3-0503SRE

Parameter name

Description Value Comments r

λd Base Failure Rate 0.012 Model as Power MOSFET

πT Temperature Factor

4.5 Picked high thermal coefficient because package is not standard transistor package.

πA Application Factor 1.5 Power < 2W, so use linear amplification value.

πQ Quality Factor 5.5 Assume quality is lowerπE Environmental

Factor8 Assume environment is

ground, fixed Gf

Entire design: 3.564

5V Power Supply - VEFT1-SMT

Parameter name

Description Value [1]

Comments

λd Base Failure Rate 0.012 Model as Power MOSFET

πT Temperature Factor

4.5 Picked high thermal coefficient because package is not standard transistor package.

πA Application Factor 1.5 Power < 2W, so use linear amplification value.

πQ Quality Factor 5.5 Assume quality is lowerπE Environmental

Factor8 Assume environment is

ground, fixed Gf

Entire design: 3.564

FMECA – OverviewOne high criticality failure mode

Glove PS fail short or input capacitors fail short Causes heating of glove and high stress on the

batteries

Detected through loss of power LED illumination, loss of function, and heating of glove

Glove power supply has internal 5A fuse No protection against short of input capacitors

Questions?