NEO-M8U - Hardware Integration Manual
UBX-15016700 - R07
Design
Page 11 of 28
Production Information
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 changed name along with their old and new
names.
No
Previous Name
New name
14
ANT_ON
LNA_EN
18
SDA
SPI CS_N
SDA /
SPI CS_N
19
SCL
SPI CLK
SCL /
SPI CLK
20
TxD
SPI MISO
TXD /
SPI MISO
21
RxD
SPI MOSI
RXD /
SPI MOSI
Table 3: Pin name changes in NEO-M8U
2.2
Minimal design
This is a minimal design for a NEO-M8U GNSS receiver.
Figure 4: NEO-M8U passive antenna design
☞
Use series resistors in the UART lines to avoid electromagnetic interference as mentioned in
section
1.5.1.
2.3
Layout: Footprint and paste mask
Figure 5 describes the footprint and provides recommendations for the paste mask for NEO-M8U
modules. These are recommendations only and not specifications. Note that the copper and solder
masks have the same size and position.
To improve the wetting of the half vias, reduce the amount of solder paste under the module and
increase the volume outside of the module by defining the dimensions of the paste mask to form a T-
shape (or equivalent) extending beyond the copper mask. For the stencil thickness, see section 5.2.
