PDM MEMS Microphone Breakout

PDM (Pulse Density Modulation) MEMS microphone breakout for hosts with PDM microphone input support, such as nRF52 and SAMD51 microcontrollers.

Logical pinout · physical placement not verified

3V
Power input pin for the PDM microphone chip.
Type · PowerVoltage · 1.8V to 3.3V supported by chip; Adafruit notes 1.8V is not tested.
GND
Power and data ground reference.
Type · GroundVoltage · 0V reference
SEL
Left/right select. High outputs on falling CLK edge as right channel; low outputs on rising edge as left channel.
Type · ControlVoltage · 3V logic domain
CLK
PDM clock input.
Type · SignalVoltage · 1 MHz to 3 MHz square wave required
DAT
PDM data output.
Type · SignalVoltage · 3V logic domain

Pin	Type	Function	Voltage
3V	Power	Power input pin for the PDM microphone chip.	1.8V to 3.3V supported by chip; Adafruit notes 1.8V is not tested.
GND	Ground	Power and data ground reference.	0V reference
SEL	Control	Left/right select. High outputs on falling CLK edge as right channel; low outputs on rising edge as left channel.	3V logic domain
CLK	Signal	PDM clock input.	1 MHz to 3 MHz square wave required
DAT	Signal	PDM data output.	3V logic domain

Logical pinout · physical placement not verified

Pin details

5 connections

3V
Power input pin for the PDM microphone chip.
PowerVoltage · 1.8V to 3.3V supported by chip; Adafruit notes 1.8V is not tested.
GND
Power and data ground reference.
GroundVoltage · 0V reference
SEL
Left/right select. High outputs on falling CLK edge as right channel; low outputs on rising edge as left channel.
ControlVoltage · 3V logic domain
CLK
PDM clock input.
SignalVoltage · 1 MHz to 3 MHz square wave required
DAT
PDM data output.
SignalVoltage · 3V logic domain

Start wiring

I2S · Analog · 3.3 – 5 V · Breakout

Adafruit/Pimoroni list the electret microphone amplifier as a MAX4466-based board with 2.4–5 V DC supply, rail-to-rail analog output and …

Module pins: 3V, GND, CLK, DAT. Schematik maps them to your board in the app.

Microphones

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Pinout