SPECIFICATIONS

Links to information:

https://pan.baidu.com/s/1SnKX3_b6Peelc6KMaQQr0w?pwd=zwsr extracted code: ZWSR

A novel microphone has arrived at the Adafruit store, the PDMMEMS Microphone! Apart from analog or I2S, PDM

\ is a "third" microphone that you can integrate with electronic devices. These microphones are very commonly used in the product, but in the manufacturer item

\ Rarely seen. However, they still have some benefits, so we think we will provide a breakthrough for the store.

The first thing to note is that this sensor does not provide an "analog" output like our electret microphone assembly. So, this is right

Useful for chips without analog input. Secondly, the digital interface is very simple pulse density modulation output. It is the number

\ word, but not PWM, nor I2S. You need to make sure your chip has a PDM interface - these days, most 32

Bit processor can be!

\ PDM is a bit like 1-bit PWM. You time the microphone at the 1mhZ-3mhz clock frequency and on the data line

\ A square wave synchronized with the clock. The data line is 0 or 1 logical output, and the density generated by the square wave will result when averaged

\ Analog value output.

\ There are several ways to manage these microphones:

Your chip comes with hardware peripherals and libraries that can manage all data at high speed, collect samples, apply filters and carry them for you

\ For simulation value (ideal!) .

\ Your chip comes with hardware peripherals that provide you with value, and then it's up to you to perform extraction/filtering. (we are in

\ Some sample code on ATSAMD21 chipset)

\ Your chip is not equipped with hardware peripherals, but you are very smart and have come up with a way to make it work (relevant

\ ATtiny85, see this example)

\ You generate a high-speed clock, then add an analog filter on the data line, and read the analog value (hack, but ok!).

Whichever way you decide to go, make sure you understand the support the platform offers, because these chips can be tricky!

\ Each order comes with a fully assembled and tested microphone and a small plug for welding the breadboard. please

\ Check out our complete guide for wiring details, schematics, sample code, data sheets, and more!

\ Technical details

\ Voltage range: 1.8-3.3V

\ Clock frequency: 1-3.25mhz

\ Current consumption: 0.6mA

\ SIGNAL to noise ratio: 61dB

\ Sensitivity: -26dbfs

\ Product size: 14.0mmx12.8mmx2.8mm/0.6 "x0.5" x0.1"

Item weight: 0.01kg