St Steval-mic008a User manual

Introduction

The STEVAL-MIC008A is an adapter board where two MP23DB01HP digital MEMS microphones are mounted.

The two microphones, mounted with a distance of 30mm, allow to perform some beam forming algorithms able to maximize gain

in some direction.

STEVAL-MIC008A can be mounted on different boards of the STM32H7 discovery kit (for example STM32H735G-DK,

STM32H7B3I-DK, STM32H747I-DISCO).

Figure 1. STEVAL-MIC008A

STEVAL-MIC008A adapter board with two MP23DB01HP MEMS microphones

UM3204

User manual

UM3204 - Rev 1 - July 2023

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

1 Getting started

1.1 Features

• Ideal to plug in the STM32H7 discovery kits, as:

–STM32H735G-DK

–STM32H7B3I-DK

–STM32H747I-DISCO

•MP23DB01HP is a bottom port digital MEMS microphones with:

– Voltage supply from 1.52 to 3.6 V

– 135 dBSPL acoustic overload point

– Omnidirectional sensitivity

– Two different operation mode (low power and performance mode)

– Sensitivity -41 dBFs ±1 dB

• Power supply coming from STM32H7 board via CN1 connector of STEVAL-MIC008A

1.2 Precautions for use

During the radiated emissions test according with EN 55032, the STEVAL-MIC008A board is compliance with

EMC standards for radiated emissions in class A (industrial environment intended use).

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Getting started

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2 How to use

Connect STEVAL-MIC008A using connector CN1 with STM32H7xxx discovery kit. If correctly mounted, the LED

LD1 mounted on the bottom of the board, switches on.

Some examples:

Figure 2. Connection with STM32H7B3I-DK

Figure 3. Connection with STM32H747I-DISCO

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How to use

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3 Schematic diagram

Figure 4. STEVAL-MIC008A circuit schematic

MEMS microphones Daughter Board

3V3_MIC_1

DETECTn

DATIN3

DETECTn

CLK_0

DATA_0

CONNECTORS LED

CARD DETECT

3V3_MIC_1

CLK_0

3V3_MIC_1

VCC_LED

3V3_MIC_1

CLK_0

DATIN7

1uF

100nF

10K

1KR3

1KR6

100RR4

20021221-00020T4LF

10 10

12 12

14 14

16 16

18 18

20 20

CN1

SB1

DATA_0

DATIN7

DATIN2

Open

Fitted: NO

DETECTn

DATIN3

CLK_0

DATA_0

3V3_MIC_1

122

344

566

788

10 10

13 12 12

14 14

CN2

DETECTn : PC12 UART5_TX

VCC_LED : PD2 UART5_RX

MP23DB01HPTR

GND

LR 2

CLK 4

VDD

DOUT 1

MP23DB01HPTR

GND

LR 2

CLK 4

VDD

DOUT 1

RED

LD1

VCC_LED

3V3_MIC_1

DATIN2 DATIN1

DATIN3

DATIN1

Open

Open SB3

SB2

SB4

By default:

DATA0 - DATI N7

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Schematic diagram

4 Bill of materials

Table 1. STEVAL-MIC008A bill of materials

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

1 2 C1, C7 1uF, 0402, 25 V CAPACITOR Murata GRM155R61E105KA12D

2 2 C2, C4 100nF, 0402, 25

VCAPACITOR Multicomp MC0402B104K250CT

3 1 CN1

SMD

Connector, 2x10

1.27mm step

Header, 10x2,

1.27mm, VR,

SMT, Height

5.600mm,

Shrouded

FCI-

AMPHENOL 20021221-00020T4LF

4 1 R3 1K, 0402, 1 W Resistor Panasonic ERJ2GEJ102X

5 1 R4 100R, 0402, 1

WResistor Multicomp PRO MCSR04X101 JTL

6 1 R5 10 K, 0402, 1 W Resistor Multicomp PRO MCMR04X103 JTL

7 1 LD1 Red Led, 0603

LED_0603_OS

RAM_LS-Q976-

NR-1_RED_1A

2K_H0P8

OSRAM LS Q976-Z

8 1 SB1 Solder bridge,

0603

SOLDER-

BRIDGE_R060

3-0R

Multicomp PRO MC0063W06030R

9 2 U1, U2 MP23DB01HPT

R, RHLGA

MEMS

Microphone ST MP23DB01HPTR

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Bill of materials

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5 Board versions

Table 2. STEVAL-MIC008A versions

Finished good Schematic diagrams Bill of materials

STEVAL$MIC008AA (1) STEVAL$MIC008AA schematic diagrams STEVAL$MIC008AA bill of materials

1. This code identifies the STEVAL-MIC008A evaluation board first version.

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Board versions

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6 Regulatory compliance

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

determinewhether 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).

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Revision history

Table 3. Document revision history

Date Revision Changes

07-Jul-2023 1 Initial release.

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Contents

1Getting started ....................................................................2

1.1 Features ......................................................................2

1.2 Precautions for use .............................................................2

2How to use ........................................................................3

3Schematic diagram ................................................................4

4Bill of materials....................................................................5

5Board versions ....................................................................6

6Regulatory compliance ............................................................7

Revision history ........................................................................8

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Contents

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List of tables

Table 1. STEVAL-MIC008A bill of materials ........................................................5

Table 2. STEVAL-MIC008A versions.............................................................6

Table 3. Document revision history ..............................................................8

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List of figures

Figure 1. STEVAL-MIC008A .................................................................1

Figure 2. Connection with STM32H7B3I-DK.......................................................3

Figure 3. Connection with STM32H747I-DISCO ....................................................3

Figure 4. STEVAL-MIC008A circuit schematic .....................................................4

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Information in this document supersedes and replaces information previously supplied in any prior versions of this document.

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