AR4100 Datasheet, PDF (7/29 Pages) Freescale Semiconductor, Inc – Low power modes consuming as little as 5 μA of current

2 Features Summary
2.1
2.2
2.3
Overview
The AR4100 is an IEEE 802.11 (b, g, n) System in Package (SiP) based on cutting edge
technology. The AR4100 includes full digital MAC and baseband engines handling all 802.11b
m _{(CCK) and 802.11g/n (OFDM). An embedded low-power CPU core minimizes host loading to}
provide an easy to implement solution.
o _{The AR4100 is architected for ultra-low power consumption, with near-zero power consumption}
.c ^{in power down modes with fast wakeup.}
le ^{Radio Front End}
The AR4100 features a high-power high-efficiency on-chip power amplifier that features:
a _{ Qualcomm Atheros proprietary EPA™ linearization technology for WiFi.}
c _{ Highly integrated LNAs.}
 Integrated Balun for Tx and Rx paths
s _{ Integrated receive and transmit RF matching and switching to enable direct antenna}
e connection with high performance, low power consumption, and near-zero RBOM for lowest
solution cost.
re _{Power Management}
.f _{The AR4100 requires both 3.3 V and 1.8 V supplies from the system. The AR4100 3.3 V inputs}
support operating voltage from 4.2 V down to 3.1 V and is tolerant of momentary overvoltage up
to 5.5 V. An on-chip switching regulator supports PWM mode and burst mode to optimize power
w _{efficiency under both peak operation and low load conditions.}
The AR4100 power management engine uses advanced power save techniques such as: gating
w _{clocks to idle or inactive blocks, voltage scaling to specific blocks in certain states, fast start and}
settling circuits to reduce Tx and active duty cycles, CPU frequency scaling, and other techniques
w^{to optimize power consumption across all operation states.}
For applications with a small Tx duty cycle, the AR4100 has the ability to quickly wake up and
burst data out at a high rate and go back into standby mode, thus taking advantage of the 5 μA of
power consumption in standby mode.
Additionally, Qualcomm Atheros can provide system level design recommendations to take
AR4100 standby current to essentially zero with the use of a high impedance FET.
MKG-16487 Ver. 5.0
7
Qualcomm Atheros, Inc.
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