User's Manual

page 13/64
Note d’étude / Technical document : URD1– OTL
5665.3 – 003 / 72238 Edition 01
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4.2 HOW TO CONNECT THE AUDIOS?
The HiLoNC V2 module features one input audio path and one output audio path. The input path is single-end
while the output path is differential. In this following chapter examples of design will be given including
protections against EMC and ESD and some notes about the routing rules to follow to avoid the TDMA noise
sometimes present in this sensitive area of design.
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Note that acoustic engineering competences are mandatory to get accurate audio performance on
customer’s product.
4.2.1 Connecting microphone and speaker
The HiLoNC V2 module can manage an external microphone (INTMIC_P) in single-end mode and an external
speaker (HSET_OUT_P / HSET_OUT_N) in differential mode. Thus, one speaker and one microphone can be
connected to the module. The 2.4V voltage to bias the microphone is implemented in the module.
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The speaker connected to the module should be 32 ohms.
Figure 7: Audio connection
If the design is ESD or EMC sensitive we strongly recommend reading the notes below.
A poor audio quality could either come from the PCB routing and placement or from the chosen components (or
even both).
HiLoNC
V2
Filter and
ESD
protection
HSET_OUT_P
HSET_OUT_N
INTMIC_P
32ohms speaker
MIC