Features• 3 on-board MP23ABS1 analog MEMS microphones• 5 slots to plug analog microphone coupon boards (e.g., STEVAL-MIC004V1)• Synchronized acquisition and streaming of up to 4 microphones• Amplification stage based on TSV91x wide bandwidth operational amplifiers• On-board external ADC• Direct acquisition of a single microphone exploiting STM32 embedded ADC• Up to 192 KHz sampling frequency• Free comprehensive development firmware library and audio capture plus USB

streaming sample application compatible with STM32Cube• Compatible with STM32 Nucleo boards• Equipped with ST morpho connectors (top and bottom) and Arduino UNO R3

connectors (top) to allow stacking of multiple boards• RoHS and WEEE compliant

DescriptionThe X-NUCLEO-AMICAM1 expansion board allows synchronized acquisition andstreaming of up to 4 microphones at a maximum sampling rate of 192 KHz.

It represents a quick and easy solution to develop microphone-based applicationsand start implementing audio algorithms.

The expansion board is designed around the MP23ABS1 analog MEMS microphoneand is compatible with the ST morpho connector layout and with analog microphonecoupon boards (e.g., STEVAL-MIC004V1).

The X-NUCLEO-AMICAM1 embeds three MP23ABS1 microphones: two connectedto an external ADC and one directly routed to the STM32 embedded ADC.

The analog amplification stage is achieved thanks to ST TSV91x wide bandwidthoperational amplifiers.

Product summary

Analog MEMSmicrophone expansionboard based onMP23ABS1 for STM32Nucleo

X-NUCLEO-AMICAM1

Microphone couponboard based onMP23ABS1 analogMEMS microphone

STEVAL-MIC004V1

High performance MEMSaudio sensor singleended analog bottom-port microphone

MP23ABS1

Application Sensing

Analog MEMS microphone expansion board based on MP23ABS1 for STM32 Nucleo

X-NUCLEO-AMICAM1

Data brief

DB4065 - Rev 1 - December 2019For further information contact your local STMicroelectronics sales office.

www.st.com

1 Schematic diagrams

Figure 1. X-NUCLEO-AMICAM1 circuit schematic - connectors

1719

1012

2

2

6

2830

33

SPI1_MISO

29

SB1

I2S_CK

NRST

NC

SB3

8

5

4

8

SB2

1

3

3V3

34

SPI1_CS

32

23

18

SB6

0R

NC

SPI_MISO

6HEADER 19x2

27

3

1

0R

8

CN9

1

0R

CN5

SB7

SB8

E5V

SB22

SB13

I2S_CK

OTG_FS_DP_NUCLEOOTG_FS_DM_NUCLEO

10 SB18

6

1113

37

2

M5+

3537

35

15

2

36

9

20

8

SB20

I2S_CK

SPI_CS

24

SB15

35

26

12

1719

1

4

0R

16 16

I2S_MCLK

7

7

SB12

23

38

SPI_MOSI

NC

SB16

5

7

14SPI1_MOSI 15

SPI1_SCK

CN6 I2S_MCLK

CN10

3

14

SB14

6

SB111

2221

9

I2S_SD1

31

A2V5

7

CN7

18

HEADER 19x22

6

NC25

2

8

J2

4

24

283029

26 I2S_SD2

NC

4

21

2

38

9

5VV_IN

10

5

1

3133

3

7

3436

11

56

13 5

25

2022

SPI_SCK

I2S_WS

321

CN8

27

4

SB21

3

4

I2S_SD2

SB4

SB190R

NC0R

0R

0RNC0R0R0R

DB

4065 - Rev 1

page 2/7

X-NU

CLEO

-AM

ICA

M1

Schematic diagram

s

Figure 2. X-NUCLEO-AMICAM1 circuit schematic - USB, power, external ADC

5OUT

NRST

C2

R60

1

AGN

D3

36

24K

C19

C1

ASDATA1

24

5GND

48

C10

1

D1

1

AD1974

16

17

47µF

ADC2LN

SPI_CS

100nF

NC8

1

21ABCLK22

C16

1

C9

NC

2

10K

R2

R150

5

C18

VBUS

D34

10µF

AVDD

38

39

30

2

C12

USB Mini-B100nF

USB1

D+3

IN1

PD/RST10

M4+

1µF

3V3

STPS160A

C15

4

7NC2

45ADC2RP

C28

I2S_WS

MCLKO/XO

C29

NC

J1

CM

C8

R5

37AV

DD

4

M2+

33K

NC731

100nF

D2

LDK130M-R

3V3

2GND

100nF

D-2

V_USB

28

25D

GN

D2

SPI_MISO

AVDD

15LDK130M-R

42ADC1RN

COUT

AGN

D2

5

11NC

1µF

USB

51K

R10

3.0 V Analog LDO

AVD

D3

C32

NC

9SH4

to ADC

ID4

C24

COMM

R70

M1+

NC10

ASDATA220

EN3

NC38

43ADC2LP44

R4

NC5

100nF

ALRCLK

CIN23

C25

C14

M1-

2

D23

CLATCH27

R80

C30

NC

ADC

M3-

possible

SH38D1

1

A2V5

1

V_USB

I2S_CK

DVDD

AVDD

2.2nF

1µF

MCLKI/XI 3

I2S_SD1

DG

ND

113

DVD

D1

SP1

C27

C13 R140

1µF

AUXDATA2

C17

NC929

Vbus

OUT5

M3+

FILTR35

M4-

C6

NC

SH27

E5V

M2-

GND2

100nF

R3

IN1

AUXBCLK

18

9NC4

12

C5

32AG

ND

5

33

DVDD

USBLC6-2SC6U3

AGN

D1

3k32

NC

ADC1LP 40

C23

R120

I2S_SD2

AVD

D1

C20 39nF

C31

C22

14

CCLK26

I2S_MCLK

100nF

6SH1

AGN

D4

R11

NC4

R1NC

R90

12K

AUXLRCLK

19

C21

2.5 V Analog LDO

2

AVD

D2

34

3V3

SPI_SCK

OTG_FS_DM_NUCLEOOTG_FS_DP_NUCLEO

3V3

41ADC1RP

C4

Place as close as

C7

NC16

SPI_MOSI

C11

NC4

ESDA7P60-1U1M

DVDD

1µF

EN3

C3

C26

NC

R130

2

U4

AUXDATA1NC6

ADC1LN

D46

46ADC2RN

LF47

100nF

U1

U2

GND2

Power supply

1µF

1µF 1µF 1µF 1µF 1µF 1µF 1µF

DB

4065 - Rev 1

page 3/7

X-NU

CLEO

-AM

ICA

M1

Schematic diagram

s

Figure 3. X-NUCLEO-AMICAM1 circuit schematic - microphones to external ADC

M4

14

11IN4+

12

AVDD

COMM

R32 10K

C42

M2H

COMM

56K

M4OUT

M3+

4GND2

1DOUT

R28 10K

3

GN

D2

7

3G

ND

21

VDD

M4+

M1

R36 10K

MP23ABS1

AVDD

R41 10K

M2OB

9IN3-

OUT2

4

M2+

M2

100nF

COMM

4

IN4-13

IN1-3

R39 2K

5GND3

COMM

GND26

GND4

R27 2K

R3756K

OUT28

OUT3

OUT12

AVDD

6GND4

M2+

M2OB

COMM

M4-

5

IN1+

5

VCC+

6

TSV914

C38

1µF

1

M1+

OUT4

M1H

R40 2K

DOUT

10VCC-

VDD1

R24

M1OB

R29 10K

SB23

AVDD

R31 56K

3GND1

COMM

M1+

1µF

R26 2K

IN3-IN3+

10

COMM

COMM

R25 10K

U7

1µF

3GND1

M3+

M3-

1µF

1µF

IN3+

M3OUT

GND26

GND4GND3

M2OB

OUT2

M2-

2G

ND

1

56K

VCC-

HEADER 3X2

R35 56K

AVDD

1

56K

M2H

M1-

HEADER 3X2

4

4GND2

3

M4OUT

VCC+

6IN2-

SB25

5IN2+

SB26

MP23ABS1

R33 10K

SB24

4

HEADER 3X2

R38 10K

R23

8OUT3

C41

OUT12

IN1-

R22

6GND4

M1H

M3OUTG

ND

3

U6

C39

100nF

M3

IN2+

4

3IN1+

GN

D1

3GND1

4G

ND

3

COMM

R30 56K

M1OBAVDD

COMM

M1OB

COMMAVDD

M4+

2

VDD1

1

Microphones OpAmp

TSV914

M1OUT

GND3

M2OUT

2OUT

AVDD

1VDD

VDD5

5GND3

2OUT

C40

M2OUTM1OUT

C44

HEADER 3X2

11IN4+

12

COMM

9

IN4-13

GND15

IN2-7

OUT2

OUT414

C37

C43

5VDD

R34 56K

1µF

NC0R

0R0R

DB

4065 - Rev 1

page 4/7

X-NU

CLEO

-AM

ICA

M1

Schematic diagram

s

Figure 4. X-NUCLEO-AMICAM1 circuit schematic - microphones to internal ADC

IN2+4

VCC-

C34

1µF

R43

M3OB R421M

MINTOUT

VDD1

VCC+

IN1-3

M5H

10nF

A2V5

DOUT

4

8

3G

ND

2INTREF

INTREF_BUFFC33

MP23ABS1

GND26

GND4

C36

5

GN

D3

TSV912

R19 100k

C35

1

GN

D1

OUT2

R1656K

MINTOUT

INTREF

A2V5

IN1+5

A2V5

1OUT1

2

4

1M

M5+

6IN2-

7OUT2

HP Filter --> fc = 2.8HzLP Filter --> fc = 99.4 KHz

R184.7k

SB9 NC

M3OB

M5H

INTREF_BUFF

A2V5

R17 160

M5

M3OB5

VDD

HEADER 3X2

GND3

100nF

U5

INTREF_BUFF

3GND1

SB10 0R

2

1µF

DB

4065 - Rev 1

page 5/7

X-NU

CLEO

-AM

ICA

M1

Schematic diagram

s

Revision history

Table 1. Document revision history

Date Version Changes

09-Dec-2019 1 Initial release.

X-NUCLEO-AMICAM1

DB4065 - Rev 1 page 6/7

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© 2019 STMicroelectronics – All rights reserved

X-NUCLEO-AMICAM1

DB4065 - Rev 1 page 7/7