LG C3400 Service Manual page 31

3. TECHNICAL BRIEF
KEYON
DBBON
VCXOEN
2. LDO Block
1. There are 11LDOs in the AD6535.
- VCORE : supplies Digital baseband Processor core and AD6535 digital core (1.8V,
- VMEM : supplies external memory and the interface to the external memory on the
- VEXT
- VSIM
- VRTC
- VABB
- VMIC
- VVCXO : supplies the voltage controlled crystal oscillator ( 2.75 V, 10 mA)
- VAPP
- VBACK : supplies the backup battery (1.8V or 2.8V, 50mA)
- VUSB
AD6535
THERM
Thermal
Shutdown
DDLO
UVLO
CHGDET
VBAT
VRTC
VEXT
Figure 3-17. AD6535 POWER MODE LOGIC
80mA)
digital baseband processor (1,8V or 2.8V, 150mA)
: supplies Radio digital interface and high voltage interface (2.93V, 170mA)
: supplies the SIM interface circuitry on the digital processor and SIM card
(1.8V or 2.85V, 20mA)
: supplies the Real-Time Clock module (1.8 V, 20 µ A)
: supplies the analog portions of the AD6535
: supplies the microphone interface circuitry (2.5 V, 2 mA)
: supplies the application (1.8V or 3.0V, 250mA)
: supplies the USB Interface (3.3V, 15mA)
VAPPEn Control Bit
VAPPmode Control Bit
VEXTmode Control Bit
VSIMEn Control Bit
POWERMODE
VCORECP
low: VCORE < 1.6 V
high: VCORE > 1.6 V
VMEMCP
low: VMEM < 2.6 V or 1.6 V
high: VMEM > 2.6 V or 1.6 V
VEXTCP
low: VEXT < 2.6 V
high: VEXT > 2.6 V
- 30 -
Enable
Application
LDO Regulator
Mode
Enable
Digital Core
LDO Regulator
Mode
Enable
Memory Interface
LDO Regulator
Mode
Enable
External Interface
LDO Regulator
Mode
Enable
SIM Interface
LDO Regulator
Mode
Enable
VCXO
LDO Regulator
VCORE Comparator
VCORE
VMEM Comparator
VMEM
VEXT Comparator
VEXT
LDOEN
VAPP
VCORE
VMEM
VEXT
VSIM
VVCXO