WLAN Power-up Sequence
V
B
A
T
,
2
.
3
t
o
5
.
5
V
V
I
O
,
1
.
8
V
S
O
C
K
_
E
<
1
0
0
µ
s
D
C
_
R
E
Q
D
C
2
D
C
,
1
.
8
V
C
K
_
R
E
Q
S
D
I
O
C
K
A
_
I
R
Q
F
R
E
F
T
1
T
2
T
A
K
E
U
P
The following sequence describes device power up from shutdown. Only the WLAN Core is enabled; the BT core is disabled.
1. No signals are allowed on the IO pins if no IO power supplied, because the IOs are not fail-safe. Exceptions are CLQ_REQ,
SLEEP_CLK, XTALP, and PCM_xxx, which are fail-safe and can tolerate external voltages with no VIO and DC2DC.
2. VBAT,VIO and SLEEP_CLK must be available before WLAN ENABLE.
3. TWAKE-UP = T1+T2. The duration of T1 is the time from WLAN ENABLE high until FREF is valid (55 ms typical).
The duration of T2 depends on:
Operating system
Host enumeration for the SDIO
PLL configuration
Firmware download
Releasing the core from reset
Firmware initialization
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© 2012 by RF Monolithics, Inc.
Technical support +1.972.448.3700
E-mail: tech_sup@rfm.com
Page 14 of 31
DR-WLS1273L-102 Data Sheet - 12/13/12
RFM [ RF MONOLITHICS, INC ]
