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1.9 Power Supply 1 Hardware Overview
Satellite M40/M45 TECRA A4 dynabook Vx/4 Maintenance Manual 25
1.9 Power Supply
The power supply unit provides many different voltages for the system board and performs the
following functions:
1. Power input monitor
y Checks whether the DC power supply (AC adapter) is connected to the computer.
y Checks whether the battery pack is connected to the computer.
y Monitors the DC power supply input voltage (AC Adapter output voltage).
2. Power supply's internal control
y Turns on and off the battery pack charging power supply.
y Issues a charging current instruction to the PWM control IC of the battery pack charging
power supply.
y Controls the supply of DC power supply input (AC Adapter output) to the power supply
unit.
y Controls the supply of power to the system block (load/logic circuit side).
y Controls forced shutdown if the power supply malfunctions.
3. Logic circuit control
y Instructs the gate array to enable/disable tuning the power on.
y Controls power-on/off operation.
4. Status display
y Turns on the Power LED (in Green or AMBER).
y Battery indicator (in Green or AMBER).
5. External interface
y Performs communication through the I2C bus (via the internal EC/KBC).
y Transfers the power supply operation mode.
6. Output monitor
y Monitors the voltage output to the system block (load/logic circuit side).
y Monitors the voltage, over voltage, input/output current of the battery pack.
y Monitors the internal temperature of the battery pack.
y Monitors the supply voltage from the AC adapter.