NEO-M8U - Hardware Integration Manual
UBX-15016700 - R07
Design
Page 10 of 28
Production Information
2
Design
2.1
Pin description
No
Name
I/O
Description
1
SAFEBOOT_N
I
SAFEBOOT_N, Test-point for service use (Leave OPEN)
2
D_SEL
I
Interface select
3
TIMEPULSE
I/O
Time pulse (disabled by default). Do not pull low during reset.
Note: configured using TIMEPULSE2 messages (see
u-blox 8 / u-blox M8
Receiver Description Including Protocol Specification [2])
4
EXTINT
I
External Interrupt Pin (disabled by default).
5
USB_DM
I/O
USB Data
6
USB_DP
I/O
USB Data
7
VDD_USB
I
USB Supply
8
RESET_N
I
RESET_N
9
VCC_RF
O
Output Voltage RF section
10
GND
I
Ground
11
RF_IN
I
GNSS signal input
12
GND
I
Ground
13
GND
I
Ground
14
LNA_EN
O
Antenna / External LNA control
15
Reserved
-
Reserved
16
Reserved
-
Reserved
17
Reserved
-
Reserved
18
SDA /
SPI CS_N
I/O
DDC Data if D_SEL =1 (or open)
SPI Chip Select if D_SEL = 0
19
SCL /
SPI CLK
I/O
DDC Clock if D_SEL =1(or open)
SPI Clock if D_SEL = 0
20
TXD /
SPI MISO
O
Serial Port if D_SEL =1(or open)
SPI MISO if D_SEL = 0
21
RXD /
SPI MOSI
I
Serial Port if D_SEL =1(or open)
SPI MOSI if D_SEL = 0
22
V_BCKP
I
Backup voltage supply
23
VCC
I
Supply voltage
24
GND
I
Ground
Table 2: Pinout of NEO-M8U
