Data Sheet

23
FORM NO.: FR2-015_ A Responsible Department：WBU Expiry Date: Forever
The information contained herein is the exclusive property of AzureWave and shall not be distributed, reproduced, or
disclosed in whole or in part without prior written permission of AzureWave.
3.6 Frequency References
The AW-NM372SM uses an internal 26MHz xtal for normal operation and an external secondary low
frequency clock for low-power-mode timing. Either the internal low-precision LPO or an external
32.768 kHz precision oscillator is required. The internal LPO frequency range is approximately 33
kHz ± 30% over process, voltage, and temperature, which is adequate for some applications.
However, a trade-off caused by this wide LPO tolerance is a small current consumption increase
during WLAN power save mode that is incurred by the need to wake up earlier to avoid missing
beacons.
The preferred approach for WLAN is to connect a precision external 32.768 kHz clock that meets
the requirements listed in Table below.
Parameter
LPO
Units
Nominal input frequency
32.768
kHz
Frequency accuracy
+-200
ppm
Duty cycle
30 - 70
%
Input signal amplitude
200 - 3300
mV , p-p
Input impedance
>100
kΩ
<5
pF
Signal type
Square-wave or sine-wave
-
Clock jitter (during initial start-up)
<10000
ppm
3.7 Power Consumption
*
3.7.1 WLAN
Band
(GHz)
Mode
BW
(MHz)
RF
Power
(dBm)
Transmit
Receive
Max.
Avg.
Duty.
(%)
Max.
Avg.
2.4 (5)
11b@1Mbps
20
17
295
290
97.7
42
41
11b@11Mbps
20
17
248
247
80.4
42
41
11g@54Mbps
20
15
148
145
45.3
40
40
11n@MCS0
20
13
223
222
86.5
42
41
11n@MCS7
20
13
133
131
43.2
42
41
Current Unit: mA
(5)Using MFG firmware.