Internal handsfree (IHF) speaker
IHF speaker used is Amazon and is connected to BoostMono Vallu N2150. Vallu is a mono D-class speaker
amplifier with an integrated inductive boost converter. Vallu’s differential audio inputs are connected to
WCD9310 Line_out1 and Line_out3 and it can be enabled/disabled by PMIC GPIO19.
Figure 51 Internal handsfree (IHF) speaker diagram
Internal microphones
Tufnel microphones are used as internal microphones. The digital microphones are connected to WCD9310
Codec.
RM-824; RM-825; RM-826
System Module
Page 6 – 24 NOKIA INTERNAL USE ONLY Issue 2
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