3.4.3 ICS-43434 MEMS Stereo Microphones
The ICS-43434 microphones are omnidirectional MEMS microphones with a wideband frequency response and a digital I
2
S output. The
microphones include a MEMS sensor, signal conditioning, ADC, filters, and different operating modes. The ICS-43434 is a bottom port
microphone, and it is placed on the bottom side of xG24 Dev Kit with acoustic ventilation holes going through to the top side. These
holes let sound waves into the microphone package.
On xG24 Dev Kit, the ICS-43434 microphones are connected through a switch. The switch must therefore be enabled by setting PC08
high before it can be used by the application. This enables power to the microphones and connects the I
2
S lines used for the sensor to
the EFR32MG24. The application code should always drive the PC08 signal either high or low to prevent it from floating. The figure
below shows how the ICS-43434 microphones are connected to the EFR32MG24.
VMCU
ICS-43434
I2S
Microphone (R)
ICS-43434
I2S
Microphone (L)
EFR32MG24
PD03
PD04
PD05
PC08
VDD_MIC
I2S_SCK
I2S_WS
I2S_SD
MIC_ENABLE
MIC_I2S_SCK
MIC_I2S_SD
MIC_I2S_WS
VDD_MIC
VDD_MIC
0: Sensor is not powered
1: Sensor is powered
Figure 3.6. ICS-43434 MEMS Microphones
UG524: xG24 Dev Kit User's Guide
Hardware
silabs.com
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