Toshiba A135 Personal Computer User Manual


 
1 Hardware Overview 1.5 Power Supply
1-10 Satellite A130/ A135 Series Maintenance Manual
1.5 Power Supply
This specification defines the performance and characteristics of the 65W/ 75W/ or 90W AC
adapter power supply. It supplies a constant voltage 19V output source for the IAKAA 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