Toshiba P205 manual Hardware Overview Power Supply

1 Hardware Overview 1.5 Power Supply

1.5Power Supply

This specification defines the performance and characteristic of 65W, 75W, and 90W AC adapter power supply. It supplies a constant voltage 19V output source for Satellite P200/ P205 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 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: blue)

•Blue: indicates AC adaptor 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 [CONFIDENTIAL]Satellite P200/P205 Series Maintenance Manual