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TECHNICAL DESCRIPTION
4.5. Power Supplies
4.5.1
Introduction
MAIN
BATTERY
BAT-TEMP
I/O
CN780
ACC-PWR
EXTPWR
nACC-SENSE
DATA-MODE0
DATA-MODE1
The Power Management Block consists of six parts as follows:
1.
Power Source
2.
Power On/Off Control
3.
Power Source Failure detection
4.
Voltage Regulation
5.
Battery Charging & Monitoring
6.
Accessory Control
4.5.2
Power Source
The battery comprises a single Lithium-Ion (Li-Ion) cell with a nominal voltage of 3.7 V and 690 mAh capacity. This type of
battery has an advantage in weight and size over Nickel Metal Hydride (NiMH) cells.
Issue 1
Revision 0
U620
IOTA
VBAT
UPR
VR
VR
VR
VR
VR
Q781
ACC-PWR
EXT-IRQ
UPR
VR
VR
Figure 5.1: Power Supply Block Diagram
R625
VBACKUP
BACKUP
CELL
VRRAM
VRMEM
D28VB
VRIO
U751
MELODY
VRABB
GENERATOR
A28V
HEADSET
VRBB
ONOFF
RESPWONZ
RPWON
VRRTC
VRSIM
VSDD
MICBIAS
CN720
MIC
(SIM)
Section 4
– 14 –
D621
D28VR
FLASH
D28V
+ SRAM
U600
CALYPSO
D18V
INT2
RFEN
VRTC
TCXOEN
U640
VBAT
SPEAKER
AMP
VSTX
U204
REG
VSRF
10578-1
MMCD020801C8
Service Manual
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