Toshiba Satellite A100 Series, Maintenance Manual

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1.7 Power Supply 1 Hardware Overview
Satellite A100/A105 / TECRA A7 Maintenance Manual 19
1.7 Power Supply
The power supply unit provides many different voltages for the system board and performs the following
functions:
1. Power input monitor
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Checks whether the DC power supply (AC adapter) is connected to the computer.
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Checks whether the battery pack is connected to the computer.
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Monitors the DC power supply input voltage (AC Adapter output voltage).
2. Power supply's internal control
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Turns on and off the battery pack charging power supply.
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Issues a charging current instruction to the PWM control IC of the battery pack charging power
supply.
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Controls the supply of DC power supply input (AC Adapter output) to the power supply unit.
?
Controls the supply of power to the system block (load/logic circuit side).
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Controls forced shutdown if the power supply malfunctions.
3. Logic circuit control
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Instructs the gate array to enable/disable tuning the power on.
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Controls power-on/off operation.
4. Status display
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Turns on the Power LED (in Blue or Green or AMBER).
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Battery indicator (in Blue or Green or AMBER or AMBER Flash).
5. External interface
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Performs communication through the I2C bus (via the internal EC/KBC).
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Transfers the power supply operation mode.
6. Output monitor
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Monitors the voltage output to the system block (load/logic circuit side).
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Monitors the voltage, over voltage, input/output current of the battery pack.
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Monitors the internal temperature of the battery pack.
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Monitors the supply voltage from the AC adapter.