1.5 Power Supply 1 Hardware Overview
Satellite M40X Series Maintenance Manual [CONFIDENTIAL] 1-15
1.5 Power Supply This specification defines the performance and characteristic of 65W and 75W AC adapter power
supply. It supplies a constant voltage 19V output source for EAL30 series notebook computer.
? A/D conversion
? The EC uses 10-bit sampling for A/D conversion to determine the following values:
– AC adaptor current
– Battery and temperature
? AC adaptor and battery check
? The EC checks the following by A/D converted values:
– Battery installed
? The EC checks the following by GPIO values:
– AC adaptor connected
? Abnormal check
? The EC determines whether the condition is abnormal, and if so, stores an error
code into the error register.
? Input port management
? The EC monitors the following input signal status:
– System power ON/OFF status
– Direct CD power ON/OFF status
? Beep and LED control
? Beep is caused by the low battery status.
? The EC controls the following two kinds of LED
– DC IN LED (one color: green)
? Green = indicates AC adaptor is connected
– Battery LED (two colors: orange and green)
? Green solid = The battery is fully charged.
? Orange = The computer is quick-charging the battery / The battery is low.
? 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