Geostar GeoS-3, Руководство пользователя

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© R&D Center “GeoStar navigation” Ltd. 2012-12-25 6

Pushbuttons, connectors, switches

LED indicators

Signal pads.
USB
—RS232
RX0
TX0
Port #0 & #1
ON/OFF
Reset
generator
1PPS
Antenna
Tx0
Battery
1.8
V←VDD_IO→3.3V
1.8V
VDD_IO
PD ON/OFF
E_FRQ
TX0
E_PPS
TX1
PD_ACK
STATUS nRESET
VBAT
RX1
1PPS
RX0
GND
+3.3V GND
5.0V
3.3V
1.8V
VDD_IO
ON OFF
1
.8
V
V
D
D
_
IO
GeoS-3
L
e
v
e
l
tr
a
n
s
la
to
rs
VDD_IO
3.3V
Tx1
Rx0
Rx1
nRESET
PD
VDD_IO
PD_ACK
STATUS
0
TX0
TX1
RX0
RX1
0
PD_ACK
STATUS
1
P
P
S
V
B
A
T
V
D
D
V
D
D
_
IO
V
_
A
N
T
ON/OFF
NRESET
PD
E
_
P
P
S
E
_
F
R
Q
0
DC-DC
LDO
3.3V
5.0V
RX1
TX1
3.3V
POWER
0
0
ON OFF
Figure 2: Block Diagram
Refer to Appendix A for schematic diagram.
2.3.1
GeoS-3 Connections
The module is connected to the following supply voltages:

VDD: 1.8V

VDD_IO: 1.8V or 3.3V (defined by dedicated switch)

V_ANT: 3.3V

VBAT: on-board battery.
There are on-board signal pads for direct connection to the module (see section 3.1.3 ).