Power Management
Power Consumption (pre-production SA-1100)
- sleep, LCD off: 15 mW 1 week = 2 W-h
- sleep, LCD on: 40 mW 2 days = 2 W-h
- 60 MHz idle: 130 mW 18 hours = 2 W-h
- 200 MHz idle: 190 mW 12 hours = 2 W-h
- 133 MHz MPEG: 1000 mW 1 hour = 1 W-h
- 200 MHz loop: 1800 mW 20 min = 0.6 W-h
Current Status
- kernel enters idle mode, button press for sleep mode
- simple kernel interface for suspending devices
Future Directions
- fine-grained control over CPU clock rate
- power-conserving scheduler, applications