MAX-7 / NEO-7 / LEA-7 - Hardware Integration Manual
GPS.G7-HW-11006-1
Design
Page 19 of 55
3.2.2
Minimal design (MAX-7Q)
This is a minimal setup for a GPS/GNSS receiver with a MAX-7Q module:
Figure 6: MAX-7 passive antenna design
For active antenna design, see section 3.4.2
For information on increasing immunity to jammers such as GSM, see section 5.3.7.
Function
PIN
No
I/O Description
Remarks
Power
VCC
8
I
Supply Voltage
Provide clean and stable supply.
GND
1,10,12
I
Ground
Assure a good
GND
connection to all
GND
pins of the module,
preferably with a large ground plane.
V_BCKP
6
I
Backup Supply
Voltage
Backup supply voltage input pin. Connect to
VCC_IO
if not used.
Antenna
RF_IN
11
I
GPS signal
input from
antenna
The connection to the antenna has to be routed on the PCB. Use a
controlled impedance of 50
Ω
to connect RF_IN
to the antenna or
the antenna connector. DC block inside.
VCC_RF
14
O
Output Voltage
RF section
Can be used for active antenna or external LNA supply.
ANT_ON
(MAX-7C/Q)
Reserved
(MAX-7W)
13
O
ANT_ON
Active antenna or ext. LNA control pin in power save mode.
ANT_ON pin voltage level is VCC_IO
-
Reserved
Leave open
UART
TXD
2
O
Serial Port
UART, leave open if not used, Voltage level referred VCC_IO. Can
be configured as TX-ready indication for the DDC interface.
RXD
3
I
Serial Port
UART, leave open if not used, Voltage level referred VCC_IO
System
TIMEPULSE
4
O
Timepulse
Signal
Leave open if not used, Voltage level referred VCC_IO
EXTINT
5
I
External
Interrupt
Leave open if not used, Voltage level referred VCC_IO
SDA
16
I/O
DDC Pins
DDC Data. Leave open, if not used.
SCL
17
I
DDC Pins
DDC Clock. Leave open, if not used.
VCC_IO
7
I
VCCC_IO
IO supply voltage. Input must be always supplied. Usually connect to
VCC Pin 8
RESET_N
9
I
Reset
Reset
V_ANT
(MAX-7W )
Reserved
(MAX-7C/Q)
15
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
-
Reserved
Leave open
Reserved
18
-
Reserved
Leave open
Table 5: Pinout MAX-7
