NEO-8Q / NEO-M8 - Hardware integration manual
UBX-15029985 - Production information
Design
Page 11 of 12
C1-Public
2
Design
2.1
Pin description
Function
Pin
No.
I/O
Description
Remarks
Power
VCC
23
Supply voltage
Provide 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 must 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
UART_TX/ SPI
MISO
Communication interface,
can be programmed as TX_READY for DDC interface.
If pin 2 low => SPI MISO.
RXD / SPI MOSI
21
I
UART_RX / 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
TIMEPULSE1
(NEO-M8T)
3
O
Timepulse
signal
Configurable Timepulse signal (one pulse per second by
default). Leave open if not used.
SAFEBOOT_N
TP2 /
SAFEBOOT_N
(NEO-M8T)
1
I
SAFEBOOT_N
SAFEBOOT_N, leave OPEN
I/O
TP2 /
SAFEBOOT_N
Configurable Timepulse2 signal
SAFEBOOT_N, leave open if not used. Do not pull low during
reset.
EXTINT
4
I
External
interrupt
External interrupt pin.
Internal pull-up resistor to VCC. Leave open if not used.
Function is disabled by default.
EXTINT0
(NEO-M8T)
RESERVED
EXTINT1
(NEO-M8T)
15
-
Reserved
Leave open.
I
External
interrupt
External interrupt pin.
Internal pull-up resistor to VCC. Leave open if not used.
Function is disabled by default.
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
LNA_EN
Antenna control can be used to turn on and off an optional
external LNA.
RESERVED
(NEO-M8M)
-
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
16, 17 -
Reserved
Leave open.
Table 2: NEO-8Q and NEO-M8 series pinout
