Panasonic CF-72 - Manual (Page 9)

3 - 1
3.Technical Information
3.1 System Overview
3.1.1 System Configuration
The main system is made up of a Main board, a SUB board, a LED board, a PAD board and a LID board.
The CPU operates at 1.6V, 1.35V(core)/2.5V; the main memory at 3.3V; the core logic at 3.3V/5V; and the
other main chips at 3.3V.
3.1.2 Power Supply System
The power supply used by the Main board is generated on the Main board based on the voltage from the AC adapter.
Power is supplied to the AC adapter and battery pack in that order when the RTC power is off or is in
suspend mode. When neither power supply can be accessed, power is supplied from the clock battery
(RTC battery).
Block Diagrams
Power Supply Configuration Diagram
Power Supply System Description On mode
Suspend
mode
Off/Hiber
nation
VC system (VC5, VC3, VC25, VC18,
VC16, VC15)
CPU and logic power supply ON OFF OFF
VB system (VB5, VB3) Logic power supply ON ON OFF
VA system (VA3) PMC power supply ON ON ON
VPP system (VPP) 12V power supply, for the card slot ON OFF OFF
Table 1: Description of Power Supply Systems
Li-Ion BATTERY
10.8V
3000mAh
VA3
AC ADAPTOR 15.6V
VC1
VB3
VC3
VD12
DC/DC
CONVERTER
OUTPUT 5V
VOLTAGE
DETECTOR
BATTERY
CHARGER
AC IN*
DC/DC
CONVERTER
OUTPUT
1.6V /1.35V
DC/DC
CONVERTER
OUTPUT 3.3V
IC44
SYSPW
AC ON*
OVERVOL
VOLTAGE
REGULATOR
OUTPUT12V
VC5
VOLTAGE
DETECTOR
VOLTAGE
DETECTOR
VOLTAGE
DETECTOR
SUSB*
SUSB*
SUSB*
SUSC*
OVERVOL
VM1
ACVOK
VA5 AC15
OVERVOL
OVERVOL
VOLTAGE
REGULATOR
OUTPUT 1.5V
IC53
IC53
IC52
IC56
VD12ON
IC54
IC24
VGA_CORE
VOLTAGE
REGULATOR
OUTPUT 2.5V
VOLTAGE
REGULATOR
OUTPUT 2.5V
IC55
VCT
VC25
VB5
SUSC*