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1 Hardware Overview 1.5 Power Supply
1-20 Tecra A3/S2 Series Maintenance Manual
6. Power ON/OFF sequence
When power is turned on or off, the EC starts the power on or off sequence.
• SQ0-4 = power ON sequence
• SQ5-B = power OFF sequence
7. Battery charging control
The EC controls the following.
• The quick charging ON/OFF
• The detection of full charge
8. Detection of the low battery
The EC detects the low battery point by the gas gauge.
• LB10M = The system will be driven by the battery for 12 more minutes.
• LB0 = The battery won't be able to drive the system after 3 minutes.
• LB1 = The battery can drive the system only during the suspend process.
• LB2 = The battery cannot drive the system.
9. New battery installation
When a new battery is installed, the EC communicates with the E
2
PROM in the battery to
read information of the newly installed battery.
10. Battery capacity calculation
The EC reads battery remaining and percentage capacity from the battery through SMBus.