NEO-M8U - Hardware Integration Manual
UBX-15016700 - R07
Migration from NEO-M8L to NEO-M8U
Page 16 of 28
Production Information
4
Migration from NEO-M8L to NEO-M8U
4.1
Hardware migration NEO-M8L to NEO-M8U
u-blox is committed to ensuring that NEO-M8U are backwards compatible to NEO-M8L. It is highly
advisable that customers consider a design review with the u-blox support team to ensure the
compatibility of key functionalities.
P
in
NEO-M8L
NEO-M8U
Remarks for Migration
Pin Name
Typical Assignment
Pin Name
Typical Assignment
1
SAFEBOOT_N Leave open.
SAFEBOOT_N Leave open.
No difference
2
D_SEL
selects the interface
D_SEL
selects the interface
No difference
3
TIMEPULSE
Timepulse (1PPS)
TIMEPULSE
Timepulse (1PPS)
No difference
4
WHEELTICK
Wheel-tick input
EXTINT
External Interrupt Pin
(disabled by default).
No problem, disabled by default.
5
USB_DM
USB Data
USB_DM
USB Data
No difference
6
USB_DP
USB Data
USB_DP
USB Data
No difference
7
VDD_USB
USB Supply
VDD_USB
USB Supply
No difference
8
RESET_N
Reset input
RESET_N
Reset input
No difference
9
VCC_RF
Can be used for active
antenna or external
LNA supply
VCC_RF
Can be used for active
antenna or external LNA
supply
No difference
10
GND
GND
GND
GND
No difference
11
RF_IN
GNSS signal input
RF_IN
GNSS signal input
No difference
12
GND
GND
GND
GND
No difference
13
GND
GND
GND
GND
No difference
14
LNA_EN
1
Used to turn on and off
an optional external
LNA
LNA_EN
Used to turn on and off an
optional external LNA
No difference
15
FWD
Forward/reverse input
for speed pulse
RESERVED
Leave open.
If it was connected on NEO-M8L,
OK to do the same on NEO-M8U.
16
RESERVED
2
Leave open.
RESERVED
Leave open.
If it was connected on NEO-M8L,
OK to do the same on NEO-M8U.
17
RESERVED
2
Leave open.
RESERVED
Leave open.
If it was connected on NEO-M8L,
OK to do the same on NEO-M8U.
18
SDA
DDC Data / SPI CS_N
SDA
DDC Data / SPI CS_N
No difference
19
SCL
DDC Clock / SPI SCK
SCL
DDC Clock / SPI SCK
No difference
20
TXD
Serial Port / SPI MISO TXD
Serial Port / SPI MISO
No difference
21
RXD
Serial Port / SPI MOSI RXD
Serial Port / SPI MOSI
No difference
22
V_BCKP
Backup Supply Voltage V_BCKP
Backup Supply Voltage
No difference
23
VCC
Supply voltage
VCC
Supply voltage
No difference
24
GND
GND
GND
GND
No difference
Table 4: Pin-out comparison NEO-M8L vs. NEO-M8U
☞
For software migration and an overall description of the module software operation, see the
u-blox
8 / u-blox M8 Receiver Description Including Protocol Specification [2].
1
In NEO-M8L documentation prior to firmware ADR 4.00 the pin 14 name was ANT_ON. The functionality of the pin 14 remains
the same, keeping the backward compatibility.
2
In NEO-M8L documentation prior to firmware ADR 4.00 pin name was NC.
