Figure 3-48. Detailed Low-Frequency Transmit/Receive Paths; Figure 3-49. Chip Power-Up/Power-Down Sequence (Exernal Input/Output Shown) - Motorola APX 1000 Detailed 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 Main 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
CLK_REQ_POL
TCXO_CLK_REQ
VDD_TCXO
TCXO_CLK
REF_CLK_REQ

Figure 3-49. Chip Power-Up/Power-Down Sequence (Exernal Input/Output Shown)

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

Figure 3-48. Detailed Low-Frequency Transmit/Receive Paths

Figure 3-49.
APX 2000/ APX 4000
Partial Current Tree
VDDS
<2.5ms
VBAT
or
VDD1P8
RTC
Startup
(OR of
nshutdown
pins)
Max 36.5 ms
Analog PORz (~135 RTC cycles) +
Efuse shifting (~1000 RTC cycles)
Hi Z - PD
NFC_CS_INV
RX path
GPS_BT_3.3V
R2476M3
100K
U2412M3
NL17SZ02
4
7.5V Batt
5 ms
Max time from clock request/
voltage to TCXO_CLK availability
Hi Z - PD
C2465M3
1UF
12
SCL
11
CS
13
SDI
5
XIN
4
LFN
3
LF1P
R2477M3
100K
USART1_TX
TC1_OCA
3-61
U2403M3
AS3930A
51009735001
1
DAT
9
SDO
1
XOUT
6
WAKE
8
NC1
1
NC2
2
NC3