User's Manual
Laird MSD45N
Hardware Integration Guide, version 0.04
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3
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www.lairdtech.com/wireless
12
Laird Technologies
Pin
#
Name
I/O
Default
State
Ref.
Description
If Unused
open
24
No Connect
-
-
No internal connection. Leave it
open
Leave open
25
No Connect
No internal connection. Leave it
open
Leave open
26
No Connect
-
-
No internal connection. Leave it
open
Leave open
27
SDIO_DATA_2
I/O
Pull-H
VDD_IO
SDIO Data2
Note: See “Integration
Considerations” for
additional integration
information.
28
WL_ACTIVE
O
Low
VDD_IO
3-Wire Wi-Fi/BT coexistence signal;
WLAN_ACTIVE for Bluetooth
coexistence
29
VCC3_3
-
3.3 V Module Power
30
GND
-
Ground
Must be
connected to
GND
31
GND
-
Ground
Must be
connected to
GND
32
No Connect
-
-
No internal connection. Leave it
open
Leave open
33
No Connect
-
-
No internal connection. Leave it
open
Leave open
34
No Connect
-
-
No internal connection. Leave it
open
Leave open
35
No Connect
-
-
No internal connection. Leave it
open
Leave open
36
BT_ACTIVE
I
Hi-Z
VDD_IO
3-Wire Wi-Fi/BT coexistence signal;
BT_ACTIVE for Bluetooth
coexistence
37
No Connect
-
-
No internal connection. Leave it
open
Leave open
38
No Connect
-
-
No internal connection. Leave it
open
Leave open
39
No Connect
-
-
No internal connection. Leave it
open
Leave open
40
No Connect
-
-
No internal connection. Leave it
open
Leave open
41
No Connect
-
-
No internal connection. Leave it
open
Leave open
42
WL_LED_ACT/
O
LOW
VCC3_3
Used for the following: