MAX-7 / NEO-7 - Hardware Integration Manual
UBX-13003704
-
R09
Production Information
Design
Page
17 of 52
3.2.1
Minimal design (NEO-7N)
Figure 5: NEO-7 passive antenna design
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
to connect
RF_IN
to the antenna or
the antenna connector. DC block inside.
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
Time pulse
signal
Configurable time pulse 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) HIGH can be used to turn on and LOW to
turn off an optional external LNA.
-
Reserved
Reserved, leave open.
RESET_N
8
I
Reset input
Reset input
D_SEL
2
I
selects the
interface
Used to select UART/DDC or SPI
Open = UART/DDC; low = SPI
RESERVED
1, 15,
16, 17
-
Reserved
Leave open.
Table 4: Pinout NEO-7
