Toshiba Satellite M40 Maintenance Manual - Page 25

Power Supply, Hardware Overview - notebook

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1.5 Power Supply 1 Hardware Overview 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 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

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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 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