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
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