Yesterday Innovative technologies arose to enrich people’s lives

1. Tomorrow Computers eventually become ubiquitous, eliminating the hassle of carrying Yesterday Innovative technologies arose to enrich people’s lives Today Gadgets are not only functional but also mobile, allowing enjoyment anytime and anywhere Deployment of Low Power Modes For E-Textile Applications Technology Motivation Shorter Battery Less Mobility High Speed High Power Consumption Can power be saved when high speed is not required? Yes, by going into low power modes ! Speed reduced or parts turned off for idle waiting Full-speed processing for essential computation Application Texas Instrument MSP430 F1232 Low Power Modes (LPM) Power-efficient design Measurement Results Implementation Challenges Problems • Interrupt wake-up requires running timer • The period to “sleep” for has to be pre-determined at compile time Solutions • Soldered an oscillator onto the chip as timer source • Calculated how long software busy loops take and replicated in hardware When it’s time to go low-power • Turn on timer to generate interrupts that will later wake up the CPU • Set the timer period to be the length of “sleep” required • Go into low power mode • Measure the current once the application reaches steady state. Substantial savings of 10% ~ 90% depending on the power mode Acknowledgements I would like to thank my advisor Diana Marculescu and her graduate student Phillip Stanley-Marbell, for their invaluable help and guidance. Presented By Jianjian Sun Electrical & Computer Engineering, Carnegie Mellon University