u-blox M8 Series - Design; 2.1 Pin description; 2.1.1 Pin name changes; 2.2 Minimal design

000000 NEO-M8L - Hardware integration manual
UBX-16010549 - R08 Design Page 10 of 28
C1-Public
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 [4])
4
WHEELTICK
I
Wheel tick input
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
LNA enable
15
FWD
I
Forward/reverse input for speed pulse
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-M8L modules
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 a changed name along with their old and new
names.
No
Previous name
New name
14
ANT_ON
LNA_EN
16
NC
RESERVED
17
NC
RESERVED
20
TxD / SPI MISO
TXD / SPI MISO
21
RxD / SPI MOSI
RXD / SPI MOSI
Table 3: Pin name changes in NEO-M8L-0 (Professional grade)