FEST ECE 477 Fall 2011 TEAM 5 Gloria Budiman Alexander Kidarsa Christopher Sakalis Vishal Gala

FEST  Far  End  Speakerphone  Test  System

INTRODUCTION  Speakerphone quality testing  Micro Controller  Codec  Muxes  Capacitors  etc

RELIABILITY ANALYSIS  Voltage Regulator 2 voltage needed 3.3V 5V 2 boards -> 4 needed Gets really hot  λ p = λ b x π T x π T x π S x π C x π Q x π E = x 3.7 x 3.7 x 1.0 x 1.0 x 1 x 6.0 =

RELIABILITY ANALYSIS  Micro Controller Main brain of the whole system Most complex chip Most pins Might get warm when doing a lot of computation  λ p = [C 1 x π T + C 2 x π E ] x π Q x π L = [0.56 x x 2.0] x 10 x = 8.36

RELIABILITY ANALYSIS  Codec Used to convert digital to analog Used to convert analog to digital Second most pin Second most complicated chip  λ p = λ BD x π MFG x π T x π CD + λ BP x π E x π Q x π PT + λ EOS = 0.16 x 0.55 x 0.35 x x 2.0 x 10 x = 1.335

RELIABILITY ANALYSIS PARAMETER NAMEDESCRIPTIONVALUECOMMENTS Voltage RegulatorGets really hot Some of the words are barely readable. Micro Controller UnitDie Complexity8.36 CodecDie Complexity1.335 Entire Design

FMECA

FMECA P1_PS1 Failure No.Failure ModePossible Causes Failure Effects Method of Detection CriticalityRemarks PS-aOutput < 3.3V or 5V Voltage regulator stopped working The device will stop working Output voltage lower than expected. Device stops working Low PS- bOutput = 0Capacitor stopped working The device will stop working Heartbeat LED stops blinking. Low

FMECA

FMECA P1_PERI1 Failure No.Failure Mode Possible Causes Failure Effects Method of Detection CriticalityRemarks PERI-aPressing push button doesn’t navigate through menu Push button failure Unable to start or stop testing modules. ObservationLow PERI-bSD Card detected but no data found SD Card board broken Unable to read or write to SD Card ObservationLow PERI-cUnable to run initialize test RS232-Mux failure Unable to initialize SPL ObservationLow PERI-dLCD is blank LCD failure OR RS232-Mux failure Unable to see and navigate menus ObservationLow

FMECA

FMECA P1_MCU1 Failure No.Failure ModePossible Causes Failure Effects Method of Detection CriticalityRemarks MCU-aSystem haltMCU Failure, Capacitor failure The device stops working Heartbeat LED stops blinking Low MCU-bSystem behaves weirdly Decoupling Capacitor failure Dirty signals received might cause the system to behave weirdly System behavior is not as expected Low Not sure what might happened

FMECA

FMECA P2_PS1 Failure No.Failure ModePossible Causes Failure Effects Method of Detection CriticalityRemarks PS-aOutput < 3.3V or 5V Voltage regulator stopped working The device will stop working Output voltage lower than expected. Device stops working Low PS- bOutput = 0Capacitor stopped working The device will stop working Heartbeat LED stops blinking. Low

FMECA

FMECA P2_AC1 Failure No.Failure ModePossible Causes Failure Effects Method of Detection CriticalityRemarks AC-aNo sound from speaker Codec failure, Codec Mux failure, MCU failure No sound can be heard from the speaker ObservationLow Cable failure is a possibility but not regarded as device failure AC-bUnable to write data Codec Failure, Codec Mux Failure, MCU failure, Single Ended to Differential Chip failure No data can be written to the SD card ObservationLow AC-cUnable to connect to phone CH1840 failure Unable to dial nor be dialed No dial tone, observation Low Telco system failure a possibility but not regarded as device failure

SUMMARY  Product should be pretty reliable Assuming correct usage  Low Criticality The user should not be injured should the product fail Unless the user touches the voltage regulator directly as soon as the device fails.

QUESTIONS(?_?)