Laird MSD45N
Hardware Integration Guide, version 1.1
Embedded Wireless Solutions Support Center:
http://ews-support.lairdtech.com
www.lairdtech.com/wireless
11
Laird Technologies
Americas: +1-800-492-2320 Option 2
Europe: +44-1628-858-940
Hong Kong: +852-2268-6567 x026
Pin
#
Name
I/O
Default
State
Ref.
Description
If Unused
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/
ANTE
O
LOW
VCC3_3
Used for the following:
Antenna switch control signal when
sharing antenna with BT signal. See
“Sharing Antenna Implementation”
for more information.
LED indicator for Wi-Fi is active
(sending a signal).
43
No Connect
-
-
No internal connection. Leave it open
Leave open
44
No Connect
-
-
No internal connection. Leave it open
Leave open
45
No Connect
-
-
No internal connection. Leave it open
Leave open
46
No Connect
-
-
No internal connection. Leave it open
Leave open
47
No Connect
-
-
No internal connection. Leave it open
Leave open
48
CHIP_PWD_L
I
Pull-H
VDD_IO
Input signal to power down the
module. Active low
See
Note 1
.
See
Note
Regarding CHIP_PWD_L.
49
No Connect
-
-
No internal connection. Leave it open
Leave open
50
No Connect
-
-
No internal connection. Leave it open
Leave open
51
No Connect
-
-
No internal connection. Leave it open
Leave open
52
No Connect
-
-
No internal connection. Leave it open
Leave open
53
No Connect
-
-
No internal connection. Leave it open
Leave open
54
No Connect
-
-
No internal connection. Leave it open
Leave open
55
SDIO_CMD
I/O
Pull-H
VDD_IO
SDIO Command