Service Manual
6.2.2 Power Supply Description
Both PA circuit and baseband circuit are powered by the external power supply directly. The power
supply circuit for the baseband board supplies power for the baseband circuit and its auxiliary modules,
and provides 9.3V voltage for the exciter board and RX board. After the DC power supply is connected,
the baseband board is powered up, and provides 13.6V voltage for the external development interface
via OMPA control. See the following figure:
3V3A
5V_GPS
1V6D 900mA
B+
Bat Power
11V~15.6V
TX Board
Filter and
Fuse
Accessory
Connectory(1A)
13V6A(1A)
U821 (1A)
Receive Board
Exciter Board
U801
(3A)
Accy Level
Translator
VBUS_SW500mA
MMP/MMC_USB
OMAP DVDD
(1.2.3.5.6.7.8.9)DVddrtc
OMAP Perpherial
FLASH
Indication LED
DAC 5610/5604
Shift/store register BU4094BCFV
ADM8515 VDDIOǃAVDDǃVREF
TUSB1105 VCCǃVCCIO
VRTC
3V3D(1.2A)
CODEC Core
CODEC_VREF
SDRAM
OMAPDVDD4
1V8D(1A)
CODEC_DigIO
MAX3232
U807
U806
CODEC_AVDD
DSA321SDA
5VA
ADC U301
DAC U304
TPS72216DBVR
PMU U803
1V6A
OMAP
CVDDA.CVCCDLL
GPS 5V
Front Panel Board
OMAP Core
CVDD1.2.3.RTC
Reserved for
CVDDA of OMAP
U802
(3A)
DCDC3
DCDC2
DCDC1
9V3A(1A)
Audio_OpAmP
RST
MPU_RST
PWRON_RST
Figure 6-6 System Power Supply Block Diagram
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