Nokia N900 Service Manual page 163

RX-51
System Module
Introduction............................................................................................................................................................6-5
Phone description .............................................................................................................................................6-5
Functional description ......................................................................................................................................6-5
Main components..............................................................................................................................................6-5
Energy management..............................................................................................................................................6-7
Battery and charging ........................................................................................................................................6-7
Backup battery...................................................................................................................................................6-8
Normal and extreme voltages .........................................................................................................................6-8
Power key and system power-up ....................................................................................................................6-9
Power distribution
Clocking scheme .............................................................................................................................................
Bluetooth and FM RDS radio
GPS module ..........................................................................................................................................................
WLAN module ......................................................................................................................................................
FM transmitter module
High-speed USB....................................................................................................................................................
Memory card interfaces
I2C buses ..............................................................................................................................................................
User interface.......................................................................................................................................................
Display module ...............................................................................................................................................
Touch screen...................................................................................................................................................
Keyboard .........................................................................................................................................................
Cameras...........................................................................................................................................................
Illumination ....................................................................................................................................................
Sensors ............................................................................................................................................................
TV-out interface..............................................................................................................................................
Consumer infrared transmitter (CIR)
Audio concept ......................................................................................................................................................
Audio HW architecture...................................................................................................................................
Cellular RF technical description
RF block diagram............................................................................................................................................
Receiver (RX) ...................................................................................................................................................
Transmitter (TX) .............................................................................................................................................
Frequency mappings...........................................................................................................................................
GSM850 frequencies
EGSM900 frequencies
GSM1800 frequencies.....................................................................................................................................
GSM1900 frequencies.....................................................................................................................................
WCDMA 2100 Rx frequencies
WCDMA 2100 Tx frequencies
WCDMA IV (1700) frequencies
WCDMA VIII (900) frequencies.......................................................................................................................
List of Tables
Table 14 Nominal voltages....................................................................................................................................6-9
Table 15 I2C bus configurations
List of Figures
Issue 1
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