1 Hardware Overview 1.5 Power Supply
1-14 Portege 2000 Maintenance Manual (960-333)
1.5 Power Supply
The power supply supplies ten different voltages to the system board.
The power supply microcontroller 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 1-5 lists the power supply output specifications.
Table 1-5 Power supply output specifications
Name
Voltage
[V]
Name/Use
PCOREV
1.35±0.1V
PⅢ-ULV
PGTLV
1.50±3%
PⅢ-ULV , M1644
B1R8V 1.8
M1644
B3V
3.30±5%
M1644,CLKGen(ICS94258), Memory slot1/2, YEBISUSS, PCMCIA
slot1, MDC(Asky), LAN(REL8139CL)
B2R5V
2.5±5%
M1644M, CLKGen(ICS94258)
P3V
3.30±5%
CPU(ADM11032), M1535, LCD, BIOS(TC58F401FT),
RTC(bq3285LD), Sound(YMF753),Mini PCI(Wireless LAN)
B5V
5.00±5%
M1644, PCMCIA slot1
VCC
5.00±5%
M1535, FLINV, YEBISUSS, Sound(YMF753), HDD, CD-R/W, USB,
FAN
SNDVCC
5.00±5%
Sound(MMM1517)
S5V
5.00±5%
CPU(MAX6501), SB(M1535)
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