Table of Contents
Introduction........................................................................................................................................................... 5–5
Phone description ............................................................................................................................................ 5–5
Energy management.......................................................................................................................................... 5–11
Electrical Interface Between Baseband and Battery.................................................................................. 5–11
Electrical Interface Between Baseband and Charger................................................................................. 5–17
Normal and extreme voltages ..................................................................................................................... 5–26
Power key and system power-up................................................................................................................ 5–26
Modes of operation....................................................................................................................................... 5–26
Power Distribution........................................................................................................................................ 5–27
SIM, µSD............................................................................................................................................................... 5–29
Electrical Interface Between Baseband and SIM ........................................................................................ 5–29
Electrical Interface Between Baseband and Memory Card........................................................................ 5–30
User interface...................................................................................................................................................... 5–31
Electrical Interface Between Baseband and Displays ................................................................................ 5–31
Electrical Interface Between Baseband and Keypad.................................................................................. 5–32
Electrical Interface Between Baseband and Backlight and Illumination................................................. 5–34
Electrical Interface Between Baseband and Camera ................................................................................. 5–35
Electrical Interface Between Baseband and Vibra ..................................................................................... 5–37
Audio Concept................................................................................................................................................ 5–37
Audio Concept........................................................................................................................................... 5–37
Electrical Interface Between Baseband and Audio Components......................................................... 5–39
RF description ..................................................................................................................................................... 5–40
RF General Description.................................................................................................................................. 5–40
GSM Receiver.................................................................................................................................................. 5–41
GSM Transmitter ............................................................................................................................................ 5–42
Technical specifications..................................................................................................................................... 5–44
Main RF characteristics for GSM band phone.............................................................................................. 5–44
Environmental conditions ............................................................................................................................ 5–44
List of Tables
Table 6 Battery, LOVIISA PMU, JUNO BB ASIC Power Distribution................................................................... 5–13
Table 7 USB charger interface ........................................................................................................................... 5–21
Table 8 Charger electrical specification ........................................................................................................... 5–22
Table 9 Wall charger .......................................................................................................................................... 5–22
Table 10 USB switch mode charger.................................................................................................................. 5–23
Table 11 Nominal voltages................................................................................................................................ 5–26
Table 12 Top Level Power Distribution Table.................................................................................................. 5–28
Table 13 59036PMU&21351 BB Power Distribution Table............................................................................. 5–28
Table 14 D2800 Baseband ASIC (BCM21351) Memory Card Interface Pins.................................................... 5–30
List of Figures
Figure 33 Key component placement (top side)................................................................................................ 5–8
Figure 34 Key component placement (bottom side)......................................................................................... 5–8
Figure 35 Electrical interface between battery and PMU and baseband...................................................... 5–12
Figure 36 Electrical interface between charger and PMU and baseband ..................................................... 5–18
Figure 37 Wall charger....................................................................................................................................... 5–19
Figure 38 Wall charger protection.................................................................................................................... 5–19
Figure 39 USB charger........................................................................................................................................ 5–20
RM-497
System Module
Issue 1 COMPANY CONFIDENTIAL Page 5 – 3
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