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5.15. Power Supplies
5.15.1. Introduction
VBAT
UPR
Sel 2.8 V
Sel 1.8 V
BACKUP
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
5.15.2. Power Source
The battery comprises a single Lithium-Ion (Li-Ion) cell with a nominal voltage of 3.7 V and 730 mAh capacities.
This type of battery has an advantage in weight and size over Nickel Metal Hydride (Ni-MH) cells.
ABB
VCRAM
VCMEM
VLMEM
VCDBB
VLRTC
VCIO1
VCIO2
VCABB
VBAT
BBS
BACKUP
ABB
VRPC Core
Figure 5.10. Power Management Block Diagram
RSIM
VRSIM
1.8 V/2.9 V
10 mA
SL
RRAM
VRRAM
1.8 V/2.8 V
50 mA
SLP
RMEM
VRMEM
1.8 V/2.8 V
60 mA
SL
VSDBB
RDBB
1.3 V/1.5 V/1.8 V
VRDBB
120 mA
SL
VRIO1
RIO
2.8 V
VRIO2
100 mA
SL
ABB
Digital Core I/O
ABB
Analogue Core
RABB
VRABB
2.8 V
50 mA
NM/SL
UPR
VLRTC
RRTC
VRRTC
1.3 V/1.5 V/1.8 V
10 µA
BK
– 5-11 –
SIM
Card
SRAM
Core
Memories
I/O Core
DBB
Memories
I/O
DBB
Core
DBB
I/O
DBB
Split Power
Low Power
Domain
Sel 1.8 V
Sel 1.5 V
DBB Backup
RTC
I/O RTC
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