ST STEVAL-STWINMA2 Manuale utente

Introduction

The STEVAL-STWINMA2 microphone array expansion adds advanced audio sensing capabilities to the STEVAL-STWINKT1B

(and STEVAL-STWINKT1) SensorTile Wireless Industrial Node (STWIN) kit for high frequency vibration monitoring applications.

The board includes four low-power, high signal-to-noise ratio (SNR) IMP23ABSU capacitive sensing microphones, supported by

a very low drop voltage, low quiescent current, and low-noise voltage regulator, ideal for battery-powered applications such as

STWIN.

The expansion board is connected via a dedicated 12-pin connector to the core system board.

The combination of STWIN and STEVAL-STWINMA2 is supported thanks to the software examples provided within the

X-CUBE-MEMSMIC1 expansion software package for STM32Cube.

The package includes one example of microphone data steaming via USB and one example of ultrasound condition monitoring

(UltrasoundFFT) that calculates the FFT of the analog microphone signal and streams the result to a PC GUI via USB.

The microphone sampling rate is set by default to 192 kHz whereas the microphone bandwidth is up to 80 kHz.

Figure 1. STEVAL-STWINMA2 board

Getting started with the industrial analog microphone array expansion for STWIN

UM3098

User manual

UM3098 - Rev 1 - May 2023

For further information contact your local STMicroelectronics sales office. www.st.com

1Features

• Analog microphone array expansion for STEVAL-STWINKT1B (and STEVAL-STWINKT1)

• Connects to the STWIN core system board through a dedicated 12-pin connector

• 3 V to 5.5 V power supply input

• 4 mm square-shaped differential microphone array

• Four IMP23ABSU high-performance, single-ended, analog, bottom-port MEMS microphones

•LDK130 300 mA low quiescent current very low noise LDO

• Ultrasound frequency response up to 80 kHz

• On-board audio-grade quad ADC

• Serial audio interface (SAI) digital output

UM3098

Features

UM3098 - Rev 1 page 2/14

2Precautions for use

Important: The STEVAL.STWINMA2 evaluation board has a level of radiated emissions in Class A. Regarding immunity,

the board is not immune to indirect electrostatic discharges (electrostatic discharges applied to objects adjacent

to the board). During the ESD test the board obtained level C, meaning that the board was not damaged during

the test, but requires the intervention of the operator to reset it. When an electrostatic discharge is applied to an

adjacent object, there is the risk that the board interrupts its functioning, and in this case the intervention of the

operator is required to reset the board, meaning un-plug and re-plug the device.

Important: This kit is not immune to indirect electrostatic discharges. During the ESD test, the kit has obtained level C. This

means that the expansion board has not been damaged during the test, but the intervention of the operator was

necessary to reset it. When an electrostatic discharge is applied to an adjacent object, the board might interrupt

its functioning. In this case, the intervention of an operator is required to reset the board (that is, to unplug and

replug the power supply line).

UM3098

Precautions for use

UM3098 - Rev 1 page 3/14

3How to use the board

The STEVAL-STWINMA2 has to be used with the STEVAL-STWINKT1B (or STEVAL-STWINKT1). The board

should be plugged on top of the STWIN core system board, using the CN4 connector, as shown below.

Figure 2. STWIN core system board

The shape of the connector makes it impossible to plug the board with the wrong orientation (see the figure

below).

Figure 3. STWIN core system board and STEVAL-STWINMA2 (or STEVAL-STWINMAV1)

The three firmware examples that allow you to test the development board can be found in the X-CUBE-

MEMSMIC1 package:

• AMicArray_Microphones_Streaming: microphone acquisition and streaming via USB

• AMicArray_Acoustic_SL: real-time sound source localization application using four signals acquired via

digital MEMS microphones and the AcousticSL middleware to estimate the arrival direction of an audio

source

• AMicArray_UltrasoundFFT: ultrasound condition monitoring application that calculates the FFT of the

analog microphone signal and streams the result to a PC GUI via USB

Refer to X-CUBE-MEMSMIC1 documentation for more details on the firmware package.

UM3098

How to use the board

UM3098 - Rev 1 page 4/14

4Schematic diagrams

Figure 4. STEVAL-STWINMA2 schematic - Mics, VDD and connector

SB2

C27

110k

SB3

SAI_SCK

A3V

GND1

4GND3

3V3

A3V

MP23ABS11

SB1

GND1

100nF

3GND2

100nF

C24 C25

A3V

SB4

GND3

39k 1uF

DOUT DOUT

C21

C26

5VDD

M55-7001242R

GND1

5VDD

100nF

SAI_SD

1uF

A3V

MP23ABS11

1uF

GND2

C28

1uF

LDK130M-R

2GND

GND1

SAI_MCLK

C20

GND3

A3V

3V3 U2

C29

DOUT

VDD

MP23ABS11

5VDD

GND2

4GND3

100nF

D3V3

SAI_FS

3GND2

C23C22

Analog VDD

Analog Mics

Connector

3.3 to 5.5 V

MP23ABS11

ADJ/BYP

OUT 5

VIN

CN1

VIN

3V3

I2C_SDA

I2C_SCL

DOUT

SB5 0R

UM3098 - Rev 1 page 5/14

UM3098

Schematic diagrams

Figure 5. STEVAL-STWINMA2 schematic - ADC

ADC

D3V3

A3V

SAI_MCLK

SAI_SD

SAI_FS

SAI_SCK

I2C_SDA

I2C_SCL

4.87k

C15

ADAU1978

AGND1

VREF

PLL_FILT

AVDD2

AGND2

PD_RST

MCLKIN

IOVDD

SDATAOUT1

SDATAOUT2

LRCLK

BCLK

AGND3 21

ADDR1_CIN

AGND4 22

NC2 23

NC5 26

NC6 27

AGND5 28

AGND6 29

NC7 30

SDA_COUT

NC1

SA_MODE

DVDD

DGND

SCL_CCLK

ADDR0_CLATCH

NC3 24

NC4 25

AVDD3 31

AIN1N 32

AIN1P 33

AIN2N 34

AIN2P 35

AIN3N 36

AIN3P 37

AIN4N 38

AIN4P 39

AVDD1 40

C13

100nF

C17 C2

10uF

39nF

C12

2200pF

C18

100nF

C11

C10C4

C14

10uF

Place close to AVDD1,

AVDD2, AVDD3 pins

Place close to

IOVDD

D3V3

A3V

C16

100nF

C19

10uF

100nF

100nF 100nF

100nF

100nF100nF

47k

UM3098 - Rev 1 page 6/14

UM3098

Schematic diagrams

5Bill of materials

Table 1. STEVAL-STWINMA2 bill of materials

Item Q.ty Ref. Part/value Description Manufacturer Order code

1 1 CN1 M55-7001242R,

CN1

M55 series 12

pin connector Harwin M55-7001242R

2 1 C1 39nF, C_0402,

10%

CAP CER 39nF

10V X5R 0402 Vishay VJ0402Y393KXQCW1BC

3 18

C2, C3, C4, C5,

C6, C9, C10,

C11, C12, C13,

C15, C16, C17,

C18, C20, C23,

C25, C27

100nF, C_0402,

10%

CAP CER

0.1UF 16V X7R

0402

Wurth

Elektronik WE 885012205037

4 3 C7, C14, C19 10uF, C_0402,

20%

CAP CER 10UF

10V X5R 0402

Samsung

Electro-

Mechanics

America, Inc.

CL05A106MP8NUB8

5 1 C8 2200pF,

C_0402, 20%

CAP CER

2200PF 10V

X5R 0402

Yageo AC0402KRX7R7BB222

6 6 C21, C22, C24,

C26, C28, C29

1uF, C_0402,

10%

CAP CER 1UF

10V X5R 0402

Wurth

Elektronik WE 885012105012

7 4 M1, M2, M3, M4

IMP23ABSUTR,

RHLGA

2.65X3.5X1.08(

MAX)MM 4L

Analog bottom

port microphone

with frequency

response up to

80 kHz for

ultrasound

analysis and

predictive

maintenance

applications

ST IMP23ABSUTR

8 1 R1 4.87k,

R_0402,1%

RES SMD

4.87K OHM 1%

1/16W 0402

Yageo RC0402FR-074K87L

9 1 R2 3k, R_0402, 1%

RES SMD 3K

OHM 1% 1/16W

0402

Yageo RC0402FR-073KL

11 1 R6 39k, R_0402,

RES SMD 39K

OHM 1% 1/16W

0402

TE Connectivity CRGCQ0402F39K

12 1 R7 110k, R_0402,

RES SMD 110K

OHM 1% 1/16W

0402

TE Connectivity CRG0402F110K

13 2 SB1,SB4 NC, R_0402

RES SMD 0

OHM 0402 (not

mounted)

Vishay Dale CRCW04020000Z0ED

14 3 SB2, SB3, SB5 0R, R_0402 RES SMD 0

OHM 0402 Vishay Dale CRCW04020000Z0ED

15 1 U1 ADAU1978,

LFCSP-40 PCM1864 ADC AD ADAU1978

16 1 U2 LDK130M-R,

SOT323-5L

300 mA low

quiescent

current very low

noise LDO

ST LDK130M-R

UM3098

Bill of materials

UM3098 - Rev 1 page 7/14

6Board versions

Table 2. STEVAL-STWINMA2 versions

PCB version Schematic diagrams Bill of materials

STEVAL$STWINMA2A (1) STEVAL$STWINMA2A schematic diagrams STEVAL$STWINMA2A bill of materials

1. This code identifies the SSTEVAL-STWINMA2 evaluation board first version. It is printed on the board PCB.

UM3098

Board versions

UM3098 - Rev 1 page 8/14

7Regulatory compliance information

Notice for US Federal Communication Commission (FCC)

For evaluation only; not FCC approved for resale

FCC NOTICE - This kit is designed to allow:

(1) Product developers to evaluate electronic components, circuitry, or software associated with the kit to

determine

whether to incorporate such items in a finished product and

(2) Software developers to write software applications for use with the end product.

This kit is not a finished product and when assembled may not be resold or otherwise marketed unless all

required FCC equipment authorizations are first obtained. Operation is subject to the condition that this product

not cause harmful interference to licensed radio stations and that this product accept harmful interference. Unless

the assembled kit is designed to operate under part 15, part 18 or part 95 of this chapter, the operator of the kit

must operate under the authority of an FCC license holder or must secure an experimental authorization under

part 5 of this chapter 3.1.2

Notice for Innovation, Science and Economic Development Canada (ISED)

For evaluation purposes only. This kit generates, uses, and can radiate radio frequency energy and has not been

tested for compliance with the limits of computing devices pursuant to Industry Canada (IC) rules.

À des fins d'évaluation uniquement. Ce kit génère, utilise et peut émettre de l'énergie radiofréquence et n'a pas

été testé pour sa conformité aux limites des appareils informatiques conformément aux règles d'Industrie Canada

(IC).

Notice for European Union

This device is in conformity with the essential requirements of the Directive 2014/30/EU (EMC) and of the

Directive 2015/863/EU (RoHS).

Notice for United Kingdom

This device is in compliance with the UK Electromagnetic Compatibility Regulations 2016 (UK S.I. 2016 No. 1091)

and with the Restriction of the Use of Certain Hazardous Substances in Electrical and Electronic Equipment

Regulations 2012 (UK S.I. 2012 No. 3032).

UM3098

Regulatory compliance information

UM3098 - Rev 1 page 9/14

Revision history

Table 3. Document revision history

Date Revision Changes

11-May-2023 1 Initial release.

UM3098

UM3098 - Rev 1 page 10/14

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