NEO-M8P - Hardware Integration Manual
UBX-15028081 - R05
Early Production Information
Design
Page 10 of 27
2
Design
2.1
Pin description
Function
PIN
No
I/O
Description
Remarks
Power
VCC
23
Supply Voltage
Provide a clean and stable supply.
GND
10,12,
13, 24
Ground
Assure a good
GND
connection to all
GND
pins of the
module, preferably with a large ground plane.
V_BCKP
22
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
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
GNSS 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 /SPI MISO
20
O
Serial Port/ SPI
MISO
Communication interface,.
Can be programmed as TX Ready for DDC interface.
If pin 2 low => SPI MISO.
RXD / SPI MOSI
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.
USB_DP
6
I/O
USB I/O line
System
TIMEPULSE
3
O
Timepulse Signal
Configurable Timepulse 1 signal (one pulse per second by
default). Leave open if not used.
SAFEBOOT_N
1
I
SAFEBOOT_N (for future service, updates and
reconfiguration, normally leave OPEN)
EXTINT
4
I
External Interrupt 0
External Interrupt Pin.
Internal pull-up resistor to
VCC
. Leave open if not used.
Function is disabled by default.
RTK_STAT
15
O
RTK Status
Shows current RTK position status
GEOFENCE_STAT
16
O
Geofence Status
Active if enabled, polarity programmable
SDA /SPI CS_N
18
I/O
DDC Data / SPI
CS_N
DDC Data
If pin 2 low => SPI chip select.
SCL /SPI CLK
19
I
DDC Clock / SPI
SCK
DDC Clock.
If pin 2 low => SPI clock.
LNA_EN
14
O
ANT_ON
LNA Enable can be used to turn on and off an optional
external LNA or active antenna
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
17
-
Reserved
Leave open.
Table 2: NEO-M8P Pinout
2.1.1
Pin name changes
Selected pin names have been updated to agree with a common naming convention across u-blox modules. The
pins have not changed their operation and are the same physical hardware but with updated names. The table
below lists the pins that have changed name along with their old and new names.
