Table 3-13. Power And I/O Pins For Ni5500; Figure 3-42. Gps Block Diagram (Vhf/700-800 Mhz) - Motorola APX 5000 Service Manual

Theory of Operation
: Global Positioning Sytem (GPS)
Signal Name Type
VBAT Power
VDDS Power
VDD_TCXO Power
RTC_CLK Clock
TCXO_CLK_LV Clock
GPS_nShutdown Input
GPS_UART_TX Output
GPS_UART_RX Input
LNA_ENABLE Output
GPS_LNA_IN Input
.
RF-VOCON-Exp
Interconnect
RF Board
Ant
3.0V
LNA

Table 3-13. Power and I/O Pins for NI5500

NL5500 ball(s)
A2, H1, D8 VSW_3.6 [U6504] (Vocon)
B3, G10, K5, E2 VCC_1.85 [U6508] (Vocon)
G1 VSW_3.6 [U6504] (Vocon)
H9 CPLD IO74 [U6101] (Vocon)
F1 TCXO [Y2204] (Expansion)
D5 CPLD IO91 [U6101] (Vocon)
F5 OMAP pin R9 [U6302]
(Vocon)
E3 OMAP pin M18 [U6302]
(Vocon)
H6 LNA [U1304] (RF) + LNA
[U2404] (Expansion)
L2 GPS antenna/front-end
SAW LNA
Figure 3-42. GPS Block Diagram (VHF/700–800 MHz)
Source/Destination [ref]
(board
External Regulators
3.6V
2.8V
(VSW_3.6)
LNA Enable
GPS_EXT_LNA_EN (H6)
GPS_LNA_IN (L2)
SAW
Description
Main NL5500 power supply
I/O Power Supply
TCXO Power Supply
32kHz RTC
26MHz TCXO
GPS Reset
GPS UART TX to OMAP UART RX
OMAP UART TX to GPS UART RX
GPS External LNA Enable
GPS RF Input from antenna
Expansion Board
1.8V
(VCC_1.85)
VBAT VDDS
VDD_TCXO (G1)
TCXO_CLK_LV (F1)
GPS IC
TI NL5500
GPS Tx
GPS_UART_TX (F5)
GPS Rx
GPS_UART_RX (E3)
32kHz RTC
RTC_CLK (H9)
Reset
GPS_NSHUTDOWN (D5)
3-61
TCXO
26MHz,
<0.5ppm
[OMAP 1710]
UART2 Rx (R9)
UART2 Tx (M18)
[CPLD]
IO74 (E2)
IO91 (D12)