Figure 3-52. Detailed Low-Frequency Transmit/Receive Paths; Figure 3-53. Chip Power-Up/Power-Down Sequence (Exernal Input/Output Shown) - Motorola APX 5000 Service Manual

Theory of Operation
: Bluetooth
32KHZ_3.3V
NFC
ANTENNA
L2407M3
6.8 mH
3.5.1 Bluetooth Power
Our Bluetooth IC operates from a 3.6V (U6504, VBAT) switching regulator located on the VOCON
board to supply the Bluetooth IC core and a 1.85V (U6508, VDDS) supply for the I/O. It has a
shutdown (U2415 pin L3) that must be high for operation to work. The power-up/down sequence
required for operation is shown in

Figure 3-53. Chip Power-Up/Power-Down Sequence (Exernal Input/Output Shown)

R2457M3
15K
C2475M3
1000PF
R2474M3
270K
O/P
C2457M3
18PF
I/P
4
TX path
R2475M3
150

Figure 3-52. Detailed Low-Frequency Transmit/Receive Paths

Figure 3-53.
APX 5000/ APX 6000/
APX 6000XE/ SRX2200
Partial Current Tree
VDDS
VBAT
or
VDD1P8
RTC
Startup
(OR of
nshutdown
pins)
CLK_REQ_POL
TCXO_CLK_REQ
VDD_TCXO
TCXO_CLK
REF_CLK_REQ
NFC_CS_INV
RX path
GPS_BT_3.3V
R2476M3 R2477M3
100K 100K
U2412M3
NL17SZ02
7.5V Batt
<2.5ms
Max 36.5 ms
Analog PORz (~135 RTC cycles) +
Efuse shifting (~1000 RTC cycles)
Hi Z - PD
5 ms
Max time from clock request/
voltage to TCXO_CLK availability
Hi Z - PD
C2465M3
1UF
U2403M3
AS3930
51009360002
12
SCL CL_DAT
11
CS DAT
13
SDI
SDO
5
XOUT
XIN
4
WARE
LFN
3
LFP NC1
NC2
USART1_TX
TC1_OCA
3-69
1
9
1
6
8
1
2