Toshiba satellite a200 Instruction De Maintenance

1.5  Power Supply 

This specification defines the performance and characteristics of the 65W, 75W, 90W, and 
120W AC adapter power supply. It supplies a constant voltage 19V output source for the 
Minnesota 10M/10MG Series Personal Computer. 

‰  A/D conversion 

•  The EC uses 10-bit sampling for A/D conversion to determine the following 

values: 

–  Battery and temperature 

 

‰  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  

 

‰  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: blue) 

•  Blue: indicates AC adapter is connected 

–  Battery LED (two colors: orange and blue) 

•  Blue 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