1.5 Power Supply 1 Hardware Overview
Detroit 20 /Detroit 20E Series Maintenance Manual
[CONFIDENTIAL]
1-11
1.5 Power Supply
This specification defines the performance and characteristic of 65W AC adapter power supply.
It supplies a constant voltage 19V output source for Detroit 20 series notebook computer.
A/D conversion
• The EC uses 10-bit sampling for A/D conversion to determine the following values:
– Battery and temperature
AC adaptor and battery check
• The EC checks the following by A/D converted values:
– Battery installed
• The EC checks the following by GPIO values:
– AC adaptor 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: green)
• Green = indicates AC adaptor is connected
– Battery LED (two colors: orange and green)
• Green 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
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