Toshiba Satellite A130, Maintenance Manual

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1 Hardware Overview 1.5 Power Supply
1-10 Satellite A130/ A135 Series Maintenance Manual
1.5 Power Supply
This specification defines the performance and characteristics of the 65W/ 75W/ or 90W AC
adapter power supply. It supplies a constant voltage 19V output source for the IAKAA Series
Personal Computer.
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A/D conversion
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The EC uses 10-bit sampling for A/D conversion to determine the following values:
– Battery and temperature
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AC adapter and battery check
•
The EC checks the following by A/D converted values:
– Battery installed
•
The EC checks the following by GPIO values:
– AC adapter connected
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Abnormal check
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The EC determines whether the condition is abnormal, and if so, stores an error
code into the error register.
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Input port management
•
The EC monitors the following input signal status:
– System power ON/OFF status
– Direct CD power ON/OFF status
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Beep and LED control
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Beep is caused by the low battery status.
•
The EC controls the following two kinds of LED
– DC IN LED (one color: blue)
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Blue: indicates AC adapter is connected
– Battery LED (two colors: orange and blue)
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Blue solid: The battery is fully charged.
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Orange: The computer is quick-charging the battery / the battery is low.
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Power ON/OFF sequence
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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