Intel PXA27 Series Design Manual page 55

Figure 3-1. Typical Battery and External Regulator Configuration
U2
S Y S_EN
ENABLE
IN
OUT
1.8V, 2.5V, 3.0V or 3.3V Regulator
U3
S Y S_EN
ENABLE
IN
OUT
1.8V, 3.5V, 3.0V or 3.3V Regulator
U4
S Y S_EN
ENABLE
IN
OUT
3.3V or 3.0V Regulator
U6
ENABLE
IN
OUT
1.1V Fixed Regulator
U5
ENABLE
IN
OUT
1.3V Fixed Regulator
U8
ENABLE
IN
OUT
0.85V - 1.30V Adj. Regulator
POW ER_SW ITCH
ADAPTER_PWR
U7
IN
Fixed Regulator
V1
Main Battery
®
Intel PXA27x Processor Family Design Guide
U9
3.0V
IN1 OUT
1.8V S Y S_EN
IN2 ENABLE
I2C Controlled Switch
PW R_EN
S Y S_EN
PW R_EN
PW R_EN
PWR_EN nBATT_FAULT
SYS_EN
PW R_EN
REG_OK
MAIN_BATT
ALL_REGULATORS_OK
PWR_SW_IN
LOGIC_VCC
P ower Control Interface
D1
OUT
PW R_ADAPTER_DETECTED
U10
nVDD_FAULT
Fault Monitor
U11
nRESET
I2C_CLK
I2C_DATA
PWR_SW_OUT
D3
R2
V2
B acku p Battery
Clocks and Power Interface
PXA27x
U 1
VCC_BB
VCC_LCD
VCC_MEM
VCC_IO
VCC_USIM
UVSO
nUVS1
nUVS2
VCC_SRAM
VCC_PLL
VCC_CORE
SYS_EN
PWR_EN
nBATT_FAULT
nVDD_FAULT
nRESET_OUT
nRESET
PWR_SCL
PWR_SDA
GPIO0
GPIO1
VCC_BATT
D2
R1
II:3-5