Name: I2S MEMS Microphone Breakout - SPH0645LM4H
Brand: Adafruit
SKU: 3421

Logical pinout · physical placement not verified

3V
Power input for the microphone breakout. Adafruit Learn states it can be powered from 1.6V to 3.6V and the logic level must match.
Type · PowerVoltage · 1.6V to 3.6V
GND
Power and data ground.
Type · GroundVoltage · 0V
BCLK
I2S bit clock, also called data clock or clock. Driven by the I2S main device to tell the microphone when to transmit data.
Type · Signal
DOUT
I2S data output from the microphone.
Type · Signal
LRCLK
I2S left/right clock, also known as WS word select. Low selects left-channel transmission, high selects right-channel transmission.
Type · Signal
SEL
Channel-select pin. Default low transmits left-channel mono; connect to high logic voltage for right-channel transmission.
Type · Signal

Pin	Type	Function	Voltage
3V	Power	Power input for the microphone breakout. Adafruit Learn states it can be powered from 1.6V to 3.6V and the logic level must match.	1.6V to 3.6V
GND	Ground	Power and data ground.	0V
BCLK	Signal	I2S bit clock, also called data clock or clock. Driven by the I2S main device to tell the microphone when to transmit data.
DOUT	Signal	I2S data output from the microphone.
LRCLK	Signal	I2S left/right clock, also known as WS word select. Low selects left-channel transmission, high selects right-channel transmission.
SEL	Signal	Channel-select pin. Default low transmits left-channel mono; connect to high logic voltage for right-channel transmission.

Logical pinout · physical placement not verified

Pin details

6 connections

3V
Power input for the microphone breakout. Adafruit Learn states it can be powered from 1.6V to 3.6V and the logic level must match.
PowerVoltage · 1.6V to 3.6V
GND
Power and data ground.
GroundVoltage · 0V
BCLK
I2S bit clock, also called data clock or clock. Driven by the I2S main device to tell the microphone when to transmit data.
Signal
DOUT
I2S data output from the microphone.
Signal
LRCLK
I2S left/right clock, also known as WS word select. Low selects left-channel transmission, high selects right-channel transmission.
Signal
SEL
Channel-select pin. Default low transmits left-channel mono; connect to high logic voltage for right-channel transmission.
Signal

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, BCLK, DOUT, LRCLK, SEL. Schematik maps them to your board in the app.

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Pinout