User's Manual

Laird MSD45N
Hardware Integration Guide, version 0.04
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3
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13
Laird Technologies
Pin
#
Name
I/O
Default
State
Ref.
Description
If Unused
ANTE
 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 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
56
SDIO_CLK
I
Hi-Z
VDD_IO
SDIO Clock (25 MHz max)
57
SDIO_DATA_0
I/O
Pull-H
VDD_IO
SDIO Data 0
58
SDIO_DATA_3
I/O
Pull-H
VDD_IO
SDIO Data 3
59
SDIO_DATA_1
I/O
Pull-H
VDD_IO
SDIO Data 1
60
GND
-
Ground
Must be
connected to
GND
Note Regarding CHIP_PWD_L: During power on/down period, the CHIP_PWD_L must be held in
low state longer than 5 µsec (T
A
and T
B
) after the VCC3_3 reaches its high state. See Figure 2.