Figure 3-54. Current Distribution Tree For Bluetooth Circuitry - Motorola APX 5000 Service Manual

3-70
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 3-54 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 VOCON.
2.23V LDO
TPS 73601
J2001 pin 11
AS3930A
Low Freq.
3.5.2 Bluetooth Clocks
The Bluetooth IC requires a 26 MHz TCXO (Y2204, TCXO_CLK) for the core and a 32.768 kHz
(U6101 pin E2 on vocon, RTC_CLK) slow clock for the USART. This is the same clock used for the
GPS portion of the BT/GPS combination IC.
The host processor IC requires a 12 MHz crystal oscillator (Y2475) clock. The LF receiver IC
requires a 32.768 kHz (U6101 pin E2 on vocon, RTC_CLK) clock.
1.85V LDO
LP38693SD
TI NL5500
BT/GPS
ST LIS3331DL
Accelerometer
8 x Level Shifters
JTAG
Logic & Level

Figure 3-54. Current Distribution Tree for Bluetooth Circuitry

7.5V Batt
SW_B+
3.6V Switcher
800mA TPS 62050
V_SW_3.60
J4001 pin41
J1001 pin 37
P2001 pin 41
VSW_3.6
3.3V LDO
500mA LP2989
GPS_BT_3.3V
Logic & Level
1 x Inverter
1 x NOR
Theory of Operation
VCP_IN
Vocon
12 MHz OSC
AT32UC3A
AVR32
16MB SDRAM
: Bluetooth
Expansion