Power Supply - Toshiba SATELLITE A200 Maintenance Manual

1 Hardware Overview
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
1-10 Minnesota 10M/10MG Series Maintenance Manual
1.5 Power Supply