u-blox MAX-7 Series User Manual

MAX-7 / NEO-7 / LEA-7 - Hardware Integration Manual
GPS.G7-HW-11006-1 Design
Page 18 of 55
Function PIN No I/O Description Remarks
Power VCC 23 I Supply Voltage Provide clean and stable supply.
GND 10,12,13,
24
I Ground Assure a good GND connection to all GND pins of the module,
preferably with a large ground plane.
V_BCKP 22 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 7 I USB Power
Supply
To use the USB interface connect this pin to 3.0 – 3.6 V.
If no USB serial port used connect to GND.
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.
VCC_RF 9 O Output Voltage
RF section
VCC_RF can be used to power an external active antenna.
UART TxD 20 O Serial Port/ SPI
MISO
Communication interface,
Can be programmed as TX-ready for DDC interface.
If pin 2 low => SPI MISO.
RxD 21 I Serial Port / SPI
MOSI
Serial input. Internal pull-up resistor to VCC. Leave open if not used.
If pin 2 low => SPI MOSI.
USB USB_DM 5 I/O USB I/O line USB bidirectional communication pin. Leave open if unused.
Implementations see section 2.6.2.
USB_DP 6 I/O USB I/O line
System TIMEPULSE 3 O Timepulse
Signal
Configurable Timepulse signal (one pulse per second by default).
Leave open if not used.
EXTINT 4 I External
Interrupt
External Interrupt Pin.
Internal pull-up resistor to VCC. Leave open if not used.
SDA 18 I/O DDC Data / SPI
CS_N
DDC Data
If pin 2 low => SPI chip select.
SCL
19
I
DDC Clock / SPI
SCK
DDC Clock.
If pin 2 low => SPI clock.
ANT_ON
(NEO-7N)
RESERVED
(NEO-7M)
14 O ANT_ON ANT_ON (antenna on) can be used to turn on and off an optional
external LNA.
- Reserved Reserved, leave open.
RESET_N
8
I
Reset input
Reset input
D_SEL 2 I selects the
interface
Allow selecting UART/DDC or SPI
open-> UART/DDC; low->SPI
RESERVED 1, 15, 16,
17
- Reserved Leave open.
Table 4: Pinout NEO-7

u-blox MAX-7 Series Specifications

General

Brand	u-blox
Model	MAX-7 Series
Category	GPS
Language	English