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3.3.13 M.2 WWAN Key B Slot
M.2 WWAN Slot (Socket 2 Key B type 2260/3042)
Pin
Signal
1
---
3
GND
5
GND
7
USB5+
9
USB5-
11
GND
21
---
23
---
25
---
27
GND
29
---
31
---
33
GND
35
---
37
---
39
GND
41
PCIE_A_RX-_M2
43
PCIE_A_RX+_M2
45
GND
47
PCIE_A_TX-_M2
49
PCIE_A_TX+_M2
51
GND
53
PCIE_A_CLK-_M2
CSM-B79
CSM-B79 User Manual - Rev. First Edition: 1.0 - Last Edition: 1.1 - Author: A.R - Reviewed by S.R. - Copyright © 2021 SECO S.p.A.
CN38
Pin
Signal
2
+3.3V_ALW
4
+3.3V_ALW
6
+1.8V_ALW (2k2 pull-up)
8
W_DISABLE1#_B
10
M2_KEYB_LED
20
---
22
---
24
---
26
W_DISABLE2#_B
28
---
30
UIM_RST#
32
UIM_CLK
34
UIM_DATA
36
UIM_PWR
38
---
40
---
42
---
44
---
46
---
48
---
50
PCIE_A_RST#
52
PCIE_A_CLKREQ#
54
PCIE_WAKE#
On CSM-B79 carrier board, to add communications
functionality, it is available a dedicated M.2 Key B
Slot for WWAN connectivity (Modems), which allows
plugging modules with USB 2.0 and/or PCI-e x1
interface.
The connector used for the M.2 WWAN slot is
CN38, which is a standard 75 pin M.2 Key B
connector, type LOTES p/n APCI0087-P001A,
H=8.5mm, with the pinout shown in the table on the
left.
On-board there is also a Threaded Spacer which allows the placement of M.2
Socket 2 Key B WWAN modules in 2260 or 3042 size.
Please be aware that PCI-e interface will be available on this slot only if:
®
Used SMARC
modules offer at least 1x PCI-e x1 interface (since it is connected to
PCI-e port #A), AND configure properly 2-4 position of the dual DIP switch SW17,
according to the table at par.3.3.11
55
PCIE_A_CLK+_M2
57
GND
59
---
61
---
63
---
65
---
67
---
69
---
71
GND
73
GND
75
---
56
---
58
---
60
---
62
---
64
---
66
---
68
---
70
+3.3V_ALW
72
+3.3V_ALW
74
+3.3V_ALW
53
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