Theory of Operation
: Bluetooth
3-53
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 3-44
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 3-44. Current Distribution Tree for Bluetooth Circuitry
7.5V Batt
3.6V Switcher
800mA TPS 62050
2.23V LDO
TPS 73601
1.85V LDO
LP38693SD
J1001 pin 37
VCP_IN
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
128MB SDRAM
SW_B+
V_SW_3.60
GPS_BT_3.3V
Summary of Contents for Astro APX 3000
Page 1: ...APXTM TWO WAY RADIOS APX 3000 DETAILED SERVICE MANUAL ...
Page 2: ......
Page 4: ...Notes ...
Page 6: ...vi Document History Notes ...
Page 10: ...x Table of Contents Notes ...
Page 12: ...xii List of Tables Notes ...
Page 18: ...xviii List of Figures Notes ...
Page 22: ...xxii CommercialWarranty Notes ...
Page 46: ...3 20 Theory of Operation Main Board Notes ...
Page 84: ...3 58 Theory of Operation Bluetooth Notes ...
Page 208: ...6 64 Troubleshooting Waveforms LF CW on Spectrum Analyzer Notes ...
Page 222: ...7 14 Troubleshooting Tables List of Board and IC Signals Notes ...
Page 282: ...8 60 Schematics Boards Overlays and Parts Lists Main Board Block UHF1 84012513001_A Notes ...
Page 390: ...8 168 Schematics Boards Overlays and Parts Lists Main Board Block VHF 84012512001_A Notes ...
Page 456: ...9 8 Debugging Fixture Powering up Covert Board Notes ...
Page 468: ...Glossary 10 Glossary Notes ...
Page 472: ...Index 4 Index Notes ...
Page 473: ......