Toshiba TECRA S1 User Manual

The power supply unit provides many different voltages for the system board and performs 
the following functions: 

1.  Power input monitor 

• Checks whether the DC power supply (AC adapter) is connected to the computer. 
• Checks whether the battery pack is connected to the computer. 
• Monitors the DC power supply input voltage (AC Adapter output voltage). 

2.  Power supply's internal control 

• Turns on and off the battery pack charging power supply. 
• Issues a charging current instruction to the PWM control IC of the battery pack 

charging power supply. 

• 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). 
• Controls forced shutdown if the power supply malfunctions. 

3.  Logic circuit control 

• Instructs the gate array to enable/disable tuning the power on. 
• Controls power-on/off operation. 

4. Status display 

• Turns on the DC IN LED (in orange or green). 
• Battery indicator (in orange or green) 

5. External interface 

• Performs communication through the I2C bus (via the internal EC/KBC). 
• Transfers the power supply operation mode. 

6. Output monitor 

• Monitors the voltage output to the system block (load/logic circuit side). 
• Monitors the voltage, overvoltage, input/output current of the battery pack. 
• Monitors the internal temperature of the battery pack. 
• Monitors the supply voltage from the AC adapter.