MAX-7 / NEO-7 - Hardware Integration Manual
UBX-13003704
-
R09
Production Information
Design
Page
18 of 52
3.2.2
Minimal design (MAX-7Q)
Figure 6: MAX-7 passive antenna design
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
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
ANT_ON (antenna on) HIGH can be used to turn on and LOW to
turn off an optional external LNA.
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
Time pulse
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
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
