RAK18000 WisBlock PDM Stereo Microphone Module Datasheet

Overview

Figure 3895: RAK18000 PDM Stereo Microphone Module

Description

RAK18000 is a WisBlock Sensor module that extends the WisBlock system with sound sensing capability. It is based on two MP34DT06J microphone modules.

The RAK18000 is a digital microphone module that is designed to detect sounds and to support left and right channels. It is also capable of changing microphone orientation on the left or right channel through the switch resistor.

Features

• Module Specifications

  • Voltage Supply: 3.3 V
  • Current Consumption: 5 µA to 650 µA
  • Chipset: ST MP34DT06J
  • 64 dB signal-to-noise ratio
  • –26 dBFS ± 1 dB sensitivity
  • Stereo microphone 2 x MP34DT06J
  • Low power consumption

• Size

  • 25 x 15 mm

Specifications

Overview

Mounting

The RAK18000 WisBlock PDM Stereo Microphone Module can be mounted to the IO slot of the WisBlock Base board. Figure 2 shows the mounting mechanism of the RAK18000 on a WisBlock Base module.

Figure 3896: RAK18000 PDM Stereo Microphone Module Mounting

Hardware

The hardware specification is categorized into five parts that cover the chipset and pinouts and the corresponding functions and diagrams of the board. It also presents the parameters and their standard values in terms of acoustic, electrical, and mechanical.

Chipset

Vendor	Part number
ST	MP34DT06J

Pin Definition

The RAK18000 WisBlock PDM Stereo Microphone Module comprises a standard WisBlock connector. The WisBlock connector allows the RAK18000 module to be mounted to a WisBlock Base board. The pin order of the connector and the pinout definition is shown in Figure 3.

NOTE

DMIC1, DMCLK, 3V3, and GND are connected to WisConnector.

Figure 3897: RAK18000 PDM Stereo Microphone Module Pinout Diagram

Acoustic and Electrical Characteristics

The table below shows RAK18000 digital microphone module acoustic and electrical characteristics:

Symbol	Description	Min.	Nom.	Max.	Unit
VDD	Supply Voltage	1.6	3.3	3.6	V
IDD	Current consumption in normal mode	-	650	-	µA
IddPdn	Current consumption in power-down mode	-	-	5	µA
AOP	Acoustic Overload Point	-	122.5		dBSPL
SNR	Signal-to-Noise Ratio	-	64	-	dB
Clock	Input clock frequency	1.2	2.4	3.25	MHz
Top	Operating temperature range	-40	-	+85	°C

Mechanical Characteristic

Board Dimensions

Figure 4 shows the dimensions and the mechanical drawing of the RAK18000 module.

Figure 3898: RAK18000 PDM Stereo Microphone Module Mechanical Drawing

WisConnector PCB Layout

Figure 3899: WisConnector PCB footprint and recommendations

Schematic Diagram

WisConnector Connection

Figure 6 shows the WisConnector connection and the digital microphone data line connected to IO3 and the clock line connected to IO4.

Figure 6: RAK18000 PDM Stereo Microphone Module Connection

Digital Microphone

Figure 7 shows the schematic of RAK18000. The two digital microphones, left or right channel, can be switch through R6, R7, R8, and R9.

Figure 3901: RAK18000 PDM Stereo Microphone Module Schematic