Yesterday Innovative technologies arose to enrich people’s lives

Today

Gadgets are not only functional but also mobile, allowing enjoyment anytime and anywhere

Tomorrow

Computers eventually become ubiquitous, eliminating the hassle of carrying

Deployment of Low Power Modes For E-Textile Applications

Full-speed processing for essential computation

Speed reduced or parts turnedoff for idle waiting

Power-efficient design

Motivation

High Power Consumption

High Speed

Shorter Battery Less Mobility

Can power be saved when high speed is not required?

Yes, by going into low power modes !

Technology

Texas Instrument MSP430 F1232Application

Low Power Modes (LPM)

Measurement Results

Implementation

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.

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 SunElectrical & Computer Engineering,

Carnegie Mellon University

ChallengesProblems

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

Substantial savings of 10% ~ 90% depending on the power mode