3-62
Theory of Operation
: Bluetooth
The host processor operates from a 3.3V LDO regulator (U2402). The 1.85V regulator enables the
3.3V LDO regulator output. The LF receiver IC is powered from a 3.3V LDO regulator (U2402).
Figure 3-50
is a partial current tree showing the flow of current from the battery to the Bluetooth-
related major components sourced by the 3.6V switching regulator on the Main Board.
Figure 3-50. Current Distribution Tree for Bluetooth Circuitry
7.5V Batt
3.6V Switcher
800mA TPS 62050
2.23V LDO
TPS 73601
1.85V LDO
LP38693SD
J2301 pin23
J1001 pin 37
VCP_IN
Main Board
Keypad Board
P2001 pin 23
TI NL5500
BT/GPS
3.3V LDO
500mA LP2989
AS3930A
Low Freq.
ST LIS3331DL
Accelerometer
Logic & Level
8 x Level Shifters
1 x Inverter
Logic & Level
1 x NOR
12 MHz OSC
AT32UC3A
AVR32
16MB SDRAM
SW_B+
V_SW_3.60
VSW_3.6
GPS_BT_3.3V
Summary of Contents for APX 2000
Page 1: ...APXTM TWO WAY RADIOS APX 1000 APX 2000 APX 4000 APX 4000Li DETAILED SERVICE MANUAL ...
Page 4: ......
Page 6: ...iv Document History Notes ...
Page 8: ...Notes vi Commercial Warranty ...
Page 10: ...Notes ...
Page 22: ...xiv List of Figures Notes ...
Page 226: ...6 64 Troubleshooting Waveforms LF CW on Spectrum Analyzer Notes ...
Page 688: ...Index 4 Index Notes ...
Page 690: ...ii Notes ...
Page 700: ...xvi List of Figures Notes ...
Page 806: ...5 50 Troubleshooting Charts PA Failure Notes ...
Page 1008: ...8 178 Schematics Boards Overlays and Parts Lists Transceiver RF Boards UHF2 84012621001 Notes ...
Page 1062: ...8 234 Schematics Boards Overlays and Parts Lists Keypad Board M2 and M3 PC000261A01 Notes ...
Page 1064: ...ii Notes ...
Page 1068: ...Notes A 4 EMEA Warranty Service and Technical Support Further Assistance From Motorola ...
Page 1090: ...Glossary 10 Glossary Notes ...
Page 1094: ...Index 4 Index Notes ...
Page 1095: ......