MAX-7 / NEO-7 / LEA-7 - Hardware Integration Manual
GPS.G7-HW-11006-1
Design
Page 20 of 55
3.2.3
Minimal design (LEA-7N)
This is a minimal setup for a GPS/GNSS receiver with a LEA-7N module:
Figure 7: LEA-7N passive antenna design
For active antenna design, see section 3.4.2
Function
PIN
No
I/O Description
Remarks
Power
VCC
6
I
Supply Voltage
Provide clean and stable supply.
GND
7, 13, 14,
15, 17
I
Ground
Assure a good
GND
connection to all
GND
pins of the module
VCC_OUT
8
O
Leave open if not used.
V_BCKP
11
I
Backup Supply
Voltage
It is recommended to connect a backup supply voltage to
V_BCKP
in order to enable Warm and Hot Start features on the positioning
modules. Otherwise, connect to
VCC
.
VDD_USB
24
I
USB Power
Supply
To use the USB interface connect this pin to 3.0 – 3.6V.
If no USB serial port used connect to GND.
Antenna
RF_IN
16
I
GPS/GALILEO
signal input
from antenna
Use a controlled impedance transmission line of 50
Ω
to connect to
RF_IN.
Do not supply DC through this pin. Use
V_ANT
pin to supply
power.
VCC_RF
18
O
Output Voltage
RF section
Can be used to power an external active antenna (
VCC_RF
connected to
V_ANT with 10
Ω
). The max power consumption of
the antenna must not exceed the datasheet specification of the
module.
Leave open if not used.
V_ANT
19
I
Antenna Bias
voltage
Connect to
GND
(or leave open) if passive antenna is used. If an
active antenna is used, add a 10
Ω
resistor in front of
V_ANT
input
to the Antenna Bias Voltage or
VCC_RF
AADET_N
20
I
Active Antenna
Detect
Input pin for optional antenna supervisor circuitry. Leave open if not
used.
