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1 Hardware Overview 1.8 Power Supply
1-18 PORTEGE A100 Maintenance Manual (960-460)
1.8 Power Supply
The power supply supplies 12 different voltages to the system board.
The power supply micro controller has the following functions.
1. Judges that the DC power supply (AC adapter) is connected to the computer.
2. Detects DC output and circuit malfunctions.
3. Controls the battery icon, and DC IN icon.
4. Turns the battery charging system on and off and detects a fully charged battery.
5. Turns the power supply on and off.
6. Provides more accurate detection of a low battery.
7. Calculates the remaining battery capacity.
8. Controls the transmission of the status signal of the main battery.
Table 1-11 lists the power supply output specifications.
Table 1-11 Power supply output specifications(1/2)
Name Voltage [V] Use
PPV 0.748 - 1.468 CPU
1R2-P1V 1.2 GMCH-M
PTV 1.05 CPU,GMCH,ICH4-M
2R5-B2V 2.5 GMCH-M, DDR MEM
1R25-P1V
1.25 GMCH,DDR MEM
LAN-E3V 3.3 ICH4-M,82562ET
B3V 3.3 PC Card Cont (YEBISU3S),PC Card
P3V 3.3
CPU Temperature Sensor (ADM1032), Clock Generator (CK408),
ICH4-M, TV Encoder, LCD, 1394, FWH, Mini PCI,
Sound Codec (AD1981), SD Card, Modem
E5V 5 USB Port
B5V 5 PC Card
P5V 5
Touch PAD, FL Inverter, ODD, KB LED, Other LEDs, HDD,
Mini PCI, Bluetooth, Cooling Fan
SND-P5V 5 AD1981, Sound Amplifier
15-EBV 10 - 15 Pull-up
1R8-C1V 1.8 1R5-C1V Power Circuit
1R8-P1V 1.8 CPU, GMCH, ICH4-M