u-blox NEO-8Q Series - 2 Design; Pin Description

NEO-8Q / NEO-M8 - Hardware Integration Manual
UBX-15029985 - R04 Production Information Design
Page 11 of 31
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  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
TIMEPULSE
1 (NEO-M8T)
3
O
Timepulse
Signal
Configurable Timepulse signal (one pulse per second by default).
Leave open if not used.
SAFEBOOT_
N
TP2/SAFEB
OOT_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