u-blox MAX-7 Series - Minimal Design (MAX-7 Q)

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