AW8155B
Jul. 2022 V1.3
www.awinic.com
15
COPYRIGHT ©2022 SHANGHAI AWINIC TECHNOLOGY CO. LTD.
Operation
The AW8155B is a non-crack-noise (NCN), ultra-low-EMI, filter-free, AB/D output mode selection, sec-
ond generation Class-D audio amplifier. Ultra low THD+N, Unique NCN function, which adjusts the
system gain automatically while detecting the “Crack” distortion of output signal, protects the speaker
from damage at high power levels and brings the most comfortable listening experience to the custom-
ers.
AW8155B NCN output power can be set to 0.65W or 0.85W for different speaker, this feature is em-
bedded in order to protect speakers from damage caused by an excessive sound level.
The AW8155B features a unique RNS technology, which effectively reduces RF energy, attenuate the
RF TDD-noise, an acceptable audible level to the customer.
The AW8155B features the EEE (Enhanced Emission Elimination) function which greatly reduces EMI
over the full bandwidth. The AW8155B achieves better than 20dB margin under FCC limits with 24 inch
of cable.
The filter-free PWM architecture and internal gain setting reduces external components count, board
area consumption, system cost and simplifies the design. The over-current, over-temperature is pre-
pared inside of the device.
The AW8155B is available in an ultra small
FCQFN
1.5mmX1.5mm-9L package. The AW8155B is
specified over the industrial temperature range of -40
℃
to +85
℃
.
One-wire pulse control
One wire pulse control technology only needs a single GPIO port to operate the chip, complete a variety of
functions, it is very popular in the area of the GPIO port shortage and portable systems.
When the control signal line is longer, because of the signal integrity or radio frequency interference problem,
it will produce the narrow glitch signal. Awinic one wire pulse control technology integrated the Deglitch circuit
in internal control pin, which can effectively eliminate the influence of the glitch signal, as shown in figure 10.
Deglitch
Glitch is eleminated
Control signal with glitch
CTRL
AW8155B
Figure 10.
Awinic Deglitch function diagram
The traditional one wire pulse control technology still receives pulse signal from control port when chip is
startup, so when the master control chip (such as mobile phone BB) sends wrong pulse during normal oper-
ation, the system will enter into error states. AW8155B uses one wire pulse latch technology, after the master
control chip has sent pulses, the state will be latched, no longer receive the latter mis-sending pulse signals,
as shown in figure 11.
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