User's Manual

T-0000-0004-V2.1: Using Mozart II
T-0000-0004-V2.1: Using Mozart II Page: 7 / 24
Some low-cost circuits will generate spurious oscillations at high frequency, therefore creating
unwanted emissions that can go quite high in terms of frequency. It is recommended that the DC/DC
converters are well-studied and tested before integration, especially when it comes to noise and
stability considerations. Because of the inherent burst structure of the Wi-Fi current consumption,
good transient response is a key factor of the power supply design – as well as track impedance and
proper grounding & decoupling of the module.
4.8 POWER MANAGEMENT FEATURES
To some extent, the module can manage power supply for itself and the external peripherals and be
informed of the type of powering it can count on. However, even if running a Mozart II-based
application on batteries can be done, it is not really the primary target of the module – continuous Wi-
Fi communication and decoding is not really energy-saving. A possible scenario would be to build a
“transportable device” (that is, mobility is a secondary function not supposed to be used every time) so
a minimal power management has been put in place.
The module will raise the Standby line when a low power / idle condition is active while reducing its
own consumption to a minimum (depending on software strategies and desired system behavior). It is
up to the internal circuitry to take the appropriate measures to lower its current consumption (powering
down the power amplifier, for instance).
5 Variants and extensions
Mozart II modules can come with some population options for special designs. The most important
variant is the so-called “all digital”: this module does not have any analog part (FM tuner and audio
codec). Please contact you nearest AwoX sales representative for more information. A separate app
note is available for this variant.
6 Connectors Description
The Mozart II module has two connectors; 2x20, 2.54mm standard male headers. Reference mating
connector to put on daughterboard (female header) is SULLINS PPTC202LFBN-RC (DigiKey S6104-
ND).
The regular mounting procedure is to have the module directly plugged to the daughterboard.
Depending on the actual connector selected, the mounting alone might be strong enough to hold
during drop tests, however it is strongly recommended to provision for mounting screws or mounting
compound.
The signal description can be found below.