Team 1 – AlgorhythmsTeam 1 – AlgorhythmsReliability and SafetyReliability and Safety

Chris ArgesChris Arges Sumanth PeddamathamSumanth Peddamatham

Radhika MulaniRadhika Mulani Alex TuckerAlex Tucker

SafetySafety Exploding Lithium Ion BatteryExploding Lithium Ion Battery

““Polymer electrolyte is not flammable” Polymer electrolyte is not flammable” - Wikipedia: Lithium ion polymer battery- Wikipedia: Lithium ion polymer battery

Noise DoseNoise Dose OSHA and EPA enforce hearing conservation OSHA and EPA enforce hearing conservation

measures when exposed to an equivalent of 90 dBA measures when exposed to an equivalent of 90 dBA for 8 hours. for 8 hours. L. Beranek, ed. L. Beranek, ed. Noise and Vibration Control.Noise and Vibration Control. Washington, DC: Institute of Noise Washington, DC: Institute of Noise

Control Engineering, 1988, ch. 17.Control Engineering, 1988, ch. 17.

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i

T

CD

1

Duration PermissiblePer Day (Hr) Exposure (dBA)

8 904 952 1001 105

0.5 1100.25 115

FMECAFMECA

PowerPower Battery & Charger, LDO, CoreBattery & Charger, LDO, Core

ProcessorsProcessors Blackfin, AVRBlackfin, AVR

MemoryMemory miniSD, SDRAM, SPI FlashminiSD, SDRAM, SPI Flash

I/OI/O Mic, DAC, Accelerometer, Communication Mic, DAC, Accelerometer, Communication

(RS-232, JTAG, ISP, etc.)(RS-232, JTAG, ISP, etc.)

MAX1555MAX1555Li+ Battery ChargerLi+ Battery Charger

CC11 = 0.04 = 0.04

ππTT = 2.6 = 2.6

CC22 = 0.0015 = 0.0015

ππEE = 4.0 = 4.0

ππQQ = 10 = 10

ππLL = 1.0 = 1.0

BiCMOS, 541 BiCMOS, 541 transistorstransistors

8585º Cº C 5 pin SOT23 (eq.1)5 pin SOT23 (eq.1)

GGMM, handheld, handheld

OtherOther > 2 years> 2 years

λλpp = = (C(C1 1 ππTT + C + C2 2 ππEE)) x ππQ Q ππLL = 1.1016 Failures/10 = 1.1016 Failures/1066 hours hours

MTTF = 1/ MTTF = 1/ λλpp = 9.08 x 10= 9.08 x 1055 hours hours

SchematicSchematic

ModuleModule

BlackfinBlackfin

CC11 = 0.24 = 0.24

ππTT = 1.5 = 1.5

CC22 = 0.35 = 0.35

ππEE = 4.0 = 4.0

ππQQ = 10 = 10

ππLL = 1.0 = 1.0

16-bit with 32-bit 16-bit with 32-bit extended precisionextended precision

100100º Cº C 176 pin LQFP (eq.3)176 pin LQFP (eq.3)

GGMM, handheld, handheld

OtherOther > 2 years> 2 years

λλpp = = (C(C1 1 ππTT + C + C2 2 ππEE)) x ππQ Q ππLL = 17.6 Failures/10 = 17.6 Failures/1066 hours hours

MTTF = 1/ MTTF = 1/ λλpp = 5.68182 x 10= 5.68182 x 1044 hours hours