Philips PageWriter TC70 - Voltage Rails; Vin; VCC_Battery 1;2

Power System Overview Theory of Operation
PageWriter TC 70 Cardiograph Service Manual 8-11
Figure 8-4 Power System Block Diagram
Voltage Rails
The following section describes the various voltage rails used on the PageWriter TC70
cardiograph.
Vin
The DC voltage is supplied from the AC/DC adapter through fuses and diodes. The voltage
level is between 13.95 to 14.43 VDC, with a maximum power output of 80watts. This voltage
is not monitored.
VCC_Battery 1/2
The battery voltages range between 9.0V to 12.6V. Discharge current (on each battery) is
limited to a continuous 6.0 amps, with a 6.3 to 8.7 amp limit for short periods. These two
voltages are monitored through the battery charger.
(CP U)
VCC_BATT
VCC_Motor
PHD_5V
CF2_nVCCD1
VCC_CORE
VCC_IO_PLD
VCC_INT_PLD
3.3V
CF2_VCC
(FPGA)
(CP U)
(CPU)
5V_PWR_ON
VCC_RTC
PWR_OUT
FLASH, SDRAM, Intel 270,SM501, Buffer, Ethernet, Touch screen, LCD, LED,
AC97 ,RS232, CF card, Wi-FI, FPGA, ADC, SDIO card, modem
5V
3.3V
USB_nRSTAC 97 _nRESET
3.3V
3.3V
3.3V
5V
3.3V
5V
VCC_BATT (3.3V)
PHD_26V_ON
LOAD_PWR
3A Max charging current
3.3V
3.3V
PWR_EN
SYS_EN
5V
VCC_1P 8
5V
12V
BACKLIGHT INVERTER
15" LCD: NEC NL10276BC30-18
10" LCD: NEC NL8060BC26-28
6" LCD: AU O G065VN 0 1
LOAD_PWR
VBAT2
(9 ~12.6 V)
Vin
VCC_PRNHD
110~240V,
50~60 Hz
AC
VM
(26V)
External AC/DC
Module
(MW159RA1549F02)
SW RGL TR
(LM2588S-Adj)
POWER SWITCH
SW RGLTR CONT
LTC1778EGN-1
VBAT1
(9~ 12. 6V)
Current limit
/switch circuit
Printer Motor Driver
(L6219DS)
Printer Head
Li-ion Battery 1
ME202CJ
(11.1V, 7100mAH)
Li-ion Battery 2
ME202CJ
(11.1V, 7100mAH)
Daul Smart Battery System
Manager
(LT1760)
SMBUS
SMBUS
5V
PWM Regulator
LTC1628
(5V Current: 4A Max
3.3V Current: 4A Max)
VCC_1P5
Regulator Adj
LTC3406
VCC_PLL
VCC_SRAM
Regulator
LTC3445
LT3470
SMBUS
Printer Motor
Battery discharging
3.3V
FPGA
SM501
Intel PXA270
BKL_PWR_ON
BOOST_PWR_ON
To PXA270
SYS_EN
Regulator Adj
LTC3404
MOSFET Power
switch
MOSFE T
Power Switch
MOSFE T
Power Switch
PWR_ON
USB1 Switch
USB2 Switch
USB3 Switch
USB4 Switch
Ke yboard
5V
5V
5V
5V
USB1_nEN
USB2_nEN
USB3_nEN
USB4_nEN
Internal Modem
Module
Modem_P WR_ ON
External
Magnetic Card/
Smart card
Reader
EXT_PS2_PWR_ON
3.3V
SDIO Power
Switch
SDIO_PWR_ON
3.3V
Int. CF Storage
Card Power
Switch
CF1_PWR_ON
3.3V
Analog Out
Power Switch
3.3V
LCD Logic
Control Power
Switch
Panel_PWR_ON
3.3V
3.3V
3.3V
Flash Memory
PWR_EN
3.3V
LAN Controller
(LAN91C111)
LAN_RST
GC_nRST
3.3V
USB_Hub
(USB2504)
UI_P WR_ON
3.3V
Touchscreen/AC97 Codec
(Wolfson WM9712LGEFL/RV )
DAC_SHDN
CHG_VDDS_ON
nCHG_MODE_ C TL
Ext. CF socket
power switch
CF2_nVCCD0
CF 2_nOC
CF2_nSHDN
Fuse
Switch
PWR_ON
PRT_5V_ON
MOSFET
Power switch
(CPU)
(CP U)
(CP U)
(CPU)
(CP U)
(CP U)
(FPGA)
(FPGA)
(F PGA )
(F PGA )
(F PGA )
(FPGA)
(FP GA )
(F PGA )
(FPGA)
(FPGA)
(FPGA)
(FPGA)
(FPGA)
(CPU) (CPU)
(CPU)
Real Time clock
Power
Option
MOSFET
Power Switch
LT1761
CPLD
VCC_BACKUP
VCC_PLD