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1 Hardware Overview 1.5 Power Supply
1-16 [CONFIDENTIAL] Satellite M40X Maintenance Manual
? Battery charging control
? The EC controls the following.
– The quick charging ON/OFF
– The detection of full charge
? 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.
? 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.
? Battery capacity calculation
? The EC reads battery remaining and percentage capacity from the battery through
SMBus.