Toshiba Satellite M40X manual Power Supply Hardware Overview

1.5 Power Supply 1 Hardware Overview

1.5Power 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 comp uter.

?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

Satellite M40X Series Maintenance Manual [CONFIDENTIAL] 1-15