Team 1 – Algorhythms Reliability and Safety Chris ArgesSumanth Peddamatham Radhika MulaniAlex Tucker

Safety  Exploding Lithium Ion Battery Exploding Lithium Ion Battery Exploding Lithium Ion Battery  “Polymer electrolyte is not flammable” - Wikipedia: Lithium ion polymer battery  Noise Dose  OSHA and EPA enforce hearing conservation measures when exposed to an equivalent of 90 dBA for 8 hours. L. Beranek, ed. Noise and Vibration Control. Washington, DC: Institute of Noise Control Engineering, 1988, ch. 17.

FMECA  Power  Battery & Charger, LDO, Core  Processors  Blackfin, AVR  Memory  miniSD, SDRAM, SPI Flash  I/O  Mic, DAC, Accelerometer, Communication (RS-232, JTAG, ISP, etc.)

MAX1555 Li+ Battery Charger  C 1 = 0.04  π T = 2.6  C 2 =  π E = 4.0  π Q = 10  π L = 1.0  BiCMOS, 541 transistors  85º C  5 pin SOT23 (eq.1)  G M, handheld  Other  > 2 years λ p = (C 1 π T + C 2 π E )π Q π L = Failures/10 6 hours λ p = (C 1 π T + C 2 π E ) x π Q π L = Failures/10 6 hours MTTF = 1/ λp= 9.08 x 10 5 hours MTTF = 1/ λp = 9.08 x 10 5 hours

Schematic

Module

Blackfin  C 1 = 0.24  π T = 1.5  C 2 = 0.35  π E = 4.0  π Q = 10  π L = 1.0  16-bit with 32-bit extended precision  100º C  176 pin LQFP (eq.3)  G M, handheld  Other  > 2 years λ p = (C 1 π T + C 2 π E )π Q π L = 17.6 Failures/10 6 hours λ p = (C 1 π T + C 2 π E ) x π Q π L = 17.6 Failures/10 6 hours MTTF = 1/ λp= x 10 4 hours MTTF = 1/ λp = x 10 4 hours