Carrier Board Design Guide for SOM-9X35 Module
18
3.3.2
M.2 Slot Height Notes
The M Key M.2 connector height should be calculated carefully to avoid mechanism interference between
SOM-9X35 module bottom heat sink and carrier board top layer components. For example, if the 0402
components (height less than 0.5mm) are placed on the carrier board top layer (under the SOM-9X35 module),
then the M Key M.2 connector height should be ≥5mm.
3.3.3 M.2 Slot Placement (unit mm)
23.00
45.00
23.00
4.00
60.00
J1
J2
77
75
151
74
75
2
2
Figure 33:
M.2 slot placement
3.4
M.2 Slot Pin Assignments
The M.2 slot consists of 132 pins. The pinouts of the M.2 slot are shown below.
PIN#
PIN Name
GPIO#
Voltage
Level
Power
Domain
I/O
Reset
Assignment
Function
J2.1
USB_DM_P1 MT8365
USB_DM_P1
3.3V
AVDD33_
USB
AIO
USB_DM_P1 2nd USB2.0 Host D-
J2.2
AU_VIN1_N
MT6390/
MT6357
AU_VIN1_N
2.8V
AVDD28_
MIC
AI
AU_VIN1_N
Earphone MIC,
Differential MIC1-
input,
J2.3
USB_DP_P1 MT8365
USB_DP_P1
3.3V
AVDD33_
USB
AIO
USB_DP_P1 2nd USB2.0 Host D+
J2.4
AU_VIN1_P
MT6390/
MT6357
AU_VIN1_P
2.8V
AVDD28_
MIC
AI
AU_VIN1_P
Earphone MIC,
Differential MIC1+
input, need Vbias on
carrier board
J2.5
GND_SIGNAL Ground
Power
Ground
SIGNAL Ground