LEON-G100 / LEON-G200 - System Integration Manual
GSM.G1-HW-09002-G3
Preliminary
System description
Page 58 of 125
LEON-Gx00-06x or
subsequent
R1
IN
OUT
GND
GPS LDO
Regulator
SHDN
u-blox
3.0 V GPS receiver
SDA2
SCL2
R2
3V0
3V0
VMAIN
3V0
U1
21
GPIO2
SDA
SCL
C1
TxD1
EXTINT0
GPIO3
GPIO4
31
30
23
24
VCC
R3
2
V_BCKP
V_BCKP
Figure 34: Application circuit for LEON-G100-06x / LEON-G200-06S wireless modules (and subsequent versions) and u-blox 3.0 V
GPS receivers
Reference
Description
Part Number - Manufacturer
R1, R2
4.7 k
Ω
Resistor 0402 5% 0.1 W
RC0402JR-074K7L - Yageo Phycomp
R3
47 k
Ω
Resistor 0402 5% 0.1 W
RC0402JR-0747KL - Yageo Phycomp
U1
Voltage Regulator for GPS Receiver
See GPS Receiver Hardware Integration Manual
Table 19: Components for application circuit for LEON-G100-06x / LEON-G200-06S and subsequent versions and u-blox 3.0 V GPS
receivers
LEON-Gx00-04S and LEON-Gx00-05S versions
LEON-Gx00-04S and LEON-Gx00-05S versions support 3 different types of GPS aiding:
Local aiding
Assist
Now
Online
Assist
Now
Offline
The embedded GPS aiding features can be used only if the DDC (I
2
C) interface of the wireless module is
connected to a u-blox GPS receiver.
GPIO pins can handle the power on/off of the GPS receiver (“GPS supply enable” function provided by
GPIO2
).
“GPS data ready” and “GPS RTC sharing” functions are not available on LEON-Gx00-05S and previous
versions.
LEON-Gx00-05S and previous versions don’t enter idle-mode when the DDC (I
2
C) interface is enabled by
the AT+UGPS command, even if power saving is enabled by the AT+UPSV command.
GPIO2
is by default configured to provide the “GPS supply enable” function (parameter <gpio_mode> of
AT+UGPIOC command set to 3 by default), to enable or disable the supply of the u-blox GPS receiver connected
to the wireless module by the AT+UGPS command. The pin is set as
Output / High, to switch on the u-blox GPS receiver, if the parameter <mode> of AT+UGPS command is set
to 1
Output / Low, to switch off the u-blox GPS receiver, if the parameter <mode> of AT+UGPS command is set
to 0 (default setting)