STMicroelectronics X-NUCLEO-EEPRMA2 User Manual

UM2665

User manual

Getting started with the X-NUCLEO-EEPRMA2 standard I²C and SPI EEPROM
memory expansion board based on M24xx and M95xx series for STM32 Nucleo

Introduction

The X-NUCLEO-EEPRMA2 expansion board is designed for M24xx series I²C and M95xx series SPI EEPROM for data reading
and writing.

The expansion board acts as an external storage device that can be used to store data such as manufacturing traceability,
calibration, user settings, error flags, data logs and monitoring data to make applications more flexible and accurate.

The X-NUCLEO-EEPRMA2 expansion board is compatible with the Arduino UNO R3 connector pin assignment and can be
easily plugged to any STM32 Nucleo development board. You can mount the ST morpho connectors if required.

Figure 1. X-NUCLEO-EEPRMA2 expansion board

UM2665 - Rev 3 - August 2020

For further information contact your local STMicroelectronics sales office.

www.st.com

1 Acronyms and abbreviations

Table 1. List of acronyms

Acronym Description

EEPROM Electrically erasable programmable read only memory

MHz Mega Hertz

MCU Microcontroller unit

SPI Serial peripheral interface

I2C Inter-integrated circuit

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Acronyms and abbreviations

UM2665 - Rev 3

page 2/23

2 Getting started

2.1 Overview

The X-NUCLEO-EEPRMA2 main features are:

• Up to 1-Mbit serial I²C bus embedded EEPROM

• Up to 4-Mbit SPI bus embedded EEPROM

• Easy portability across different MCU families

• Equipped with Arduino™ UNO R3 connector

• Compatible with STM32 Nucleo boards

• Free comprehensive development firmware library and sample implementation available when the X-

NUCLEO-EEPRMA2 expansion board is plugged on top of a NUCLEO-F401RE or NUCLEO-L053R8

development board

• Developer can choose and solder an EEPROM to be tested using the evaluation software provided

2.2 Typical applications

The X-NUCLEO-EEPRMA2 expansion board acts as an external storage device that can be used for storing data
such as manufacturing traceability, calibration data, user setting, error flags, data log and monitoring data to make
applications more flexible and accurate.

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Getting started

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page 3/23

2.3 Hardware requirements

To use STM32 Nucleo development boards with the X-NUCLEO-EEPRMA2 expansion board, connect the boards
as shown below.

Figure 2. X-NUCLEO-EEPRMA2 expansion board connected to an STM32 Nucleo development board

UM2665

Hardware requirements

2.4

2.5

UM2665 - Rev 3

The EEPROM communicates with the STM32 Nucleo development board host microcontroller through the SPI or
I²C signals available on the Arduino UNO R3 connector.

The X-NUCLEO-EEPRMA2 has been designed to allow using any STM32 Nucleo board, although complete
testing has been performed using the NUCLEO-F401RE and NUCLEO-L053R8 boards.

System requirements

To use the STM32 Nucleo development boards with the X-NUCLEO-EEPRMA2 expansion board you need:

• a Windows PC/laptop (Windows 7 or above) to install the firmware package (X-CUBE-EEPRMA1)

• a type A to Mini-B USB cable to connect the STM32 Nucleo board to the PC

• an STM32 Nucleo development board (NUCLEO-F401RE or NUCLEO-L053R8)

• an X-NUCLEO-EEPRMA2 expansion board

Board setup

Step 1. Check the jumper on J1 and J2 connectors are connected.

These jumpers provide the required voltage to the devices.

Step 2. Ensure jumper on J11 is put between VCC and WPn.

Step 3. Ensure jumper on J10 is put between U7_Sn and CN5_3_U7_Sn.

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Step 4. Connect the X-NUCLEO-EEPRMA2 to the STM32 Nucleo board as shown in Figure 2.

Step 5. Power the STM32 Nucleo development board using the Mini-B USB cable.

Step 6. Program the firmware in the development board.

Step 7. Reset the MCU board using the reset button on the STM32 Nucleo development board.

The evaluation kit is ready-to-use.

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Board setup

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UM2665

Hardware description and configuration

3 Hardware description and configuration

3.1 Interconnection details

The X-NUCLEO-EEPRMA2 expansion board and the NUCLEO-L053R8 or NUCLEO-F401RE board connection
details are listed below.

Table 2. X-NUCLEO-EEPRMA2 and NUCLEO-L053R8 connection details (left connector)

Signal name

NC IOREF RESET 3V3 5V GND GND VIN A0 A1 A2 A3 A4 A5

Connector name

CN6 Power CN8 Analog

Pin number

1 2 3 4 5 6 7 8 1 2 3 4 5 6

NUCLEO-L053R8 MCU port

NRST PA0 PA1 PA4 PB0 PC1/PB9 PC0/PB8

NUCLEO-L053R8 MCU signals

3.3 V
RESET

REF

NC 3V3 GND GND M95_WPn M24_VCC M95_Hn U8_Sn

3.3 V
input/

output

5 V

output

GND GND

POWER

INPUT

X-NUCLEO-EEPRMA2 expansion board signals

ADC_IN0 ADC_IN1 ADC_IN4 ADC_IN8

ADC_IN11(PC1)

or

I2C1_SDA(PB9)

ADC_IN10(PC0)

or

I2C1_SCL(PB8)

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UM2665

Interconnection details

Table 3. X-NUCLEO-EEPRMA2 and NUCLEO-L053R8 connection details (right connector)

Signal name

D15 D14 AREF GND D13 D12 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0

Connector name

CN5 Digital CN9 Digital

Pin number

10 9 8 7 6 5 4 3 2 1 8 7 6 5 4 3 2 1

NUCLEO-L053R8 MCU port

PB8 PB9 PA5 PA6 PA7 PB6 PC7 PA9 PA8 PB10 PB4 PB5 PB3 PA10 PA2 PA3

NUCLEO-L053R8 MCU signals

I2C_SCL

I2C_SDA

M24_I2C_SCL

M24_I2C_SDA

AVDD

GND

GND

SPI1_SCK

SPI1_MISO

M95_MISO

M95_SCLK

SPI1_CS

TIM12_CH2

TIM12_CH2 SPI1_MOSI

X-NUCLEO-EEPRMA2 shield signals

M95_MOSI

U6_Sn

CN5_3_U7_Sn

TIM2_CH3

TIM12_CH1

TIM2_CH2

U5_Sn

USART2_TX

Table 4. X-NUCLEO-EEPRMA2 and NUCLEO-F401RE connection details (left connector)

Signal name

NC IOREF RESET 3V3 5V GND GND VIN A0 A1 A2 A3 A4 A5

Connector name

CN6 Power CN8 Analog

Pin number

1 2 3 4 5 6 7 8 1 2 3 4 5 6

NUCLEO-F401RE MCU port

NRST PA0 PA1 PA4 PB0 PC1 PC0

NUCLEO-F401RE MCU signals

3.3 V
RESET

REF

NC 3V3 GND GND M95_WPn M24_VCC M95_Hn U8_Sn

3.3 V
input/

output

5 V

output

GND GND

POWER

INPUT

X-NUCLEO-EEPRMA2 expansion board signals

ADC1_0 ADC1_1 ADC1_4 ADC1_8

ADC1_11(PC1)

or

I2C1_SDA(PB9)

ADC1_10(PC0)

or

I2C1_SCL(PB8)

USART2_RX

UM2665 - Rev 3

page 7/23

UM2665

Current measurement

Table 5. X-NUCLEO-EEPRMA2 and NUCLEO-F401RE connection details (right connector)

Signal name

D15 D14 AREF GND D13 D12 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0

Connector name

CN5 Digital CN9 Digital

Pin number

10 9 8 7 6 5 4 3 2 1 8 7 6 5 4 3 2 1

NUCLEO-F401RE MCU port

PB8 PB9 PA5 PA6 PA7 PB6 PC7 PA9 PA8 PB10 PB4 PB5 PB3 PA10 PA2 PA3

NUCLEO-F401RE MCU signals

I2C1_SCL

I2C1_SDA

M24_I2C_SCL

M24_I2C_SDA

AVDD

GND

GND

SPI1_SCK

SPI1_MISO

M95_MISO

M95_SCLK

3.2 Current measurement

J1 can be used to monitor the I²C device power consumption, whereas J2 can be used to monitor the SPI device
power consumption. Connect an ammeter probe between the connector pin 1 and pin 2 for measurements.

TIM3_CH2

TIM4_CH4 SPI1_CS

TIM1_CH1N SPI1_MOSI

X-NUCLEO-EEPRMA2 shield signals

M95_MOSI

U6_Sn

CN5_3_U7_Sn

TIM2_CH3

TIM3_CH1

TIM2_CH2

U5_Sn

USART2_TX

USART2_RX

UM2665 - Rev 3

page 8/23

X-NUCLEO-EEPRMA2 component placement details

3.3 X-NUCLEO-EEPRMA2 component placement details

Figure 3. X-NUCLEO-EEPRMA2 component placement details

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Figure 4. X-NUCLEO-EEPRMA2 top view layout

UM2665 - Rev 3

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X-NUCLEO-EEPRMA2 component placement details

Figure 5. X-NUCLEO-EEPRMA2 bottom view layout

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UM2665 - Rev 3

page 10/23

4 Component description

4.1 M24XX

Feature Description

Sales type M24C02-FMC6TG

Package UFDFPN8

Single supply voltage 1.7 to 5.5 V (full temperature range) and 1.6 to 1.7 V (limited temperature range)

Feature Description

Sales type M24256-DFDW6TP

Package TSSOP8

Single supply voltage and high speed 1 MHz clock from 1.7 to 5.5 V

UM2665

Component description

Table 6. M24C02 details

Table 7. M24256 details

Sales type M24M01-DFMN6TP

Package SO8

Single supply voltage and high speed 1 MHz clock from 1.7 to 5.5 V

4.2 M95XX

Sales type M95040-RMC6TG

Package UFDFPN8

Single supply voltage 1.7 to 5.5 V

Sales type M95256-DFDW6TP

Package TSSOP8

Single supply voltage 1.7 to 5.5 V

Table 8. M24M01 details

Feature Description

Table 9. M95040 details

Feature Description

Table 10. M95256 details

Feature Description

UM2665 - Rev 3

page 11/23

Table 11. M95M04 details

Feature Description

Sales type M95M04-DRMN6TP

Package SO8

Single supply voltage 1.8 to 5.5 V

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M95XX

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page 12/23

5 External EEPROMs

External SPI EEPROM

You can easily solder a specific EEPROM density I²C or SPI to be used with the X-NUCLEO-EEPRMA2
expansion board. The software can handle any density between 2 Kbit and 4 Mbits.

To use the external EEPROM, you have to apply some changes to the firmware and the hardware, as described
below.

Step 1. Uncomment the macro M24XX (to use the I²C EEPROM) or M95XX (to use the SPI EEPROM) in the

“eeprom_expansion.h” file

Step 2. Comment the macro I²C (to use the external I²C EEPROM) or the macro SPI (to use the external SPI

EEPROM).

Step 3. Open J5 and J6 3V3 and VCC pins and short the EXT and VCC pins

Note: External VCC can be used to power EEPROM with a different VCC for specific evaluations.

Figure 6. I2C and SPI EEPROM soldered on the X-NUCLEO-EEPRMA2 expansion board

UM2665

External EEPROMs

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6 Bill of materials

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

1 1 U1

2 1 U2

3 1 U3

4 1 U5

5 1 U6

6 1 U7

7 2 U4, U8 SO8 Not mounted Any

8 1 U9 UFDFPN5 Not mounted Any

9 1 U10 WLCSP Not mounted Any

8 1 CN5

9 2 CN6, CN9

10 2 CN7, CN10

11 1 CN8

12 8

13 2 J1, J2 2 pin male strip Jumpers Any

14 1 J4 5 pin male strip Jumpers Any

15 4

16 1 J7

17 1 J9 4 pin male strip Jumpers Any

18 1 J8 6 pin male strip Jumpers Any

19 5

20 2 R5, R6

21 1 R37

C1, C2, C3,
C4, C5, C6,
C7, C9

J5, J6, J10,
J11

R1, R2, R8,
R9, R35

Table 12. X-NUCLEO-EEPRMA2 bill of materials

2 KBIT 400 KHZ
UFDFPN8

256 KBIT 1 MHZ
TSSOP8

1 MBIT 1 MHZ
SO8

4 KBIT 5 MHZ
UFDFPN8

256 KBIT 20 MHZ
TSSOP8

4 MBIT 10 MHZ
SO8

10 pin female-male
strip, 2.54 mm
pitch

8 pin female-male
strip, 2.54 mm
pitch

19x2 through hole,

2.54 mm pitch

6 pin female-male
strip, 2.54 mm
pitch

100 nF 25 V ±10%
X7R SMD0603

3 pin male strip Jumpers Any

open - 2 pin male
strip

10 K ±5% 1/10 W
SMD0603

3.3 K ±5% 1/10 W
SMD0603

1 kohm ±5% 1/10
W SMD0603

2-Kbit serial I²C bus
EEPROM

256-Kbit serial I²C
bus EEPROM

1-Mbit serial I²C bus
EEPROM

4-Kbit SPI bus
EEPROM with high­speed clock

256-Kbit serial SPI
bus EEPROM with
high speed clock

4-Mbit serial SPI bus
EEPROM

Header Samtec ESQ-110-24-T-S

Header Samtec ESQ-108-24-T-S

Header Samtec ESQ-119-24-T-S

Header Samtec ESQ-108-24-T-S

Ceramic capacitor Murata GRM188R71E104KA01D

Jumpers Any

Resistors Panasonic ERJ-3GEYJ103V

Resistors Yageo RC0603JR-073K3L

Resistors Panasonic ERJ-3GEYJ102V

ST M24C02-FMC6TG

ST M24256-DFDW6TP

ST M24M01-DFMN6TP

ST M95040-RMC6TG

ST M95256-DFDW6TP

ST M95M04-DRMN6TP

UM2665

Bill of materials

UM2665 - Rev 3

page 14/23

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

22 4

23 8

24 2 S11, S15 OPEN Solder bridge Any

25 2 S10, S13 OPEN Solder bridge Any

R22, R32,
R33, R34

S1, S2, S3,
S4, S5, S6,
S7, S20

10 K ±5% 1/10 W
SMD0402

CLOSE Solder bridge Any

Resistors Panasonic ERJ-2GEJ103X

UM2665

Bill of materials

UM2665 - Rev 3

page 15/23

M95_MOSI

C2

D

3
4

VWSS

5

J11

M95M04-DRMN6TP

M95_VCC

U6

10K

M95_VCC

3V3

U8_EXT_SUPPLY

A3

J6

100nF

3
4

VWSSD

5

10K

M95_SCLK

CON3

10K

U6_Sn

C

6

3V3

2

9

Ex.PAD

M95_Hn

M95_MISO

M95_SCLK

C

6

1
2
3

J4

HOLD

VCC

8

M95_Hn

U9

EEPROM_WLCSP

M95_VCC

7

HOLD

M95_WPn

U8_VCC

A1

M95_SCLK

CON5

7

HOLD

U5_Sn

M95_Hn

M95_VCC

FOR CURRENT MEASUREMENT

R1

CON3

Q

2

C1

C5

U10

VCC

8

7

M95_VCC

M95_MISO

CN5_3_U7_Sn

U8_Sn

E15
2
4

1
2
3
4

M95_Hn

U8_VCC

10K

M95256-DFDW6TP

S

1

1
2
3

M95_VCC

CON3

10K

R34

100nF

M95_MISO

EEPROM_UFDFPN5

U8_VCC

(4Kb, DFN8 )

(256Kb, TSSOP)

(4Mb, SO8N)

EEPROM_SPI_SO8N

U8_VCC

M95_VCC

R2

M95_VCC

M95_VCC

M95_VCC

M95_WPn

C3

J10

1
2

S
Q

S

1

B2

R22
10K

M95_MOSI

1
2
3
4
5

C

6

M95_VCC

U8

M95_MOSI

M95_MISO

2
3

Q
W
VSS

4

R8

U7

R9

HOLD

8

VCC

M95_MISO

D

5

C3

C6

10K

C

6

M95040-RMC6TG

3
4

VWSSD

5

100nF

10K

1
2

S
Q

M95_SCLK

U5

U7_Sn

M95_WPn

J9

M95_WPn

U8_Sn

1

D2

10K

M95_VCC

1
2
3

M95_Hn

1
2
3

7

M95_MOSI

R33

R35

M95_WPn

E3

M95_WPn

R32

100nF

J2

M95_VCC

M95_MOSI

U7_Sn

8

VCC

M95_SCLK

UM2665 - Rev 3

7 Schematic diagrams

Figure 7. X-NUCLEO-EEPRMA2 circuit schematic (1 of 4)

page 16/23

Schematic diagrams

UM2665

M24_I2C_SCL

M24_WC

WC

7

9

Ex.PAD

M24_VCC

U1

1

(2Kb, DFN8 )

(256Kb, TSSOP)

(1Mb, SO8N)

EEPROM_I2C_SO8N

FOR CURRENT MEASUREMENT

3V3

M24_WC

M24_WC

100nF

M24_VCC

1K R37

M24_WC

U3

M24_WC

5

3

OPEN

5

VSSSDA

SCL

6

2

3.3K

M24_VCC

C7

M24_I2C_SDA

VSSSDA

SCL

6

M24_I2C_SDA

M24_I2C_SCL

3V3

VSS SDA

6

SCL

M24_I2C_SCL
M24_I2C_SDA

E1

2

U4

JJ11

R5

U2

4

M24M01-DFMN6TP

M24_VCC

5

M24_VCC

E0

1

M24_WC

5

JJ88

C4

M24256-DFDW6TP

R6

J5

M24_VCC

U4_VCC

M24C02-FMC6TG

1

U4_VCC
U4_EXT_SUPPLY

3.3K

2
3

EE1

2

4

1
2
3
4
5
6

VCC

8

100nF

M24_I2C_SCL

CON6

1
2

EE0

1

E2

3

WC

7

WC

7

VCC

8
2
3

EE1

2

4

CC11

M24_I2C_SCL

100nF

M24_I2C_SDA

VCC

8

4

EV2

SSSDA

SCL

6

1
2
3

CON3

2

DU

1

J7

8

VCC

100nF

C9

M24_I2C_SCL
M24_I2C_SDA

M24_VCC

M24_I2C_SDA

U4_VCC

WC

7

M24_VCC

M24_VCC

E0

1

M24_VCC

M24_VCC

UM2665 - Rev 3

Figure 8. X-NUCLEO-EEPRMA2 circuit schematic (2 of 4)

page 17/23

Schematic diagrams

UM2665

21

27

38

25

2
4
6
8
1
12

24

30

3V3
5V

31

RESET

1817

A5

14

D1
D0

35

CN7

36

26

23

D8

1
3
5
7
9

AREF

D6

17

A0

16

A2
A3

D4

13

SCL

D2

Vin

29

1
3
5
7
9

11

30
32
34

12

29

20

21

13
15

D13

28

22

0

33

26

3V3

19

34

CN10

22

D10
D9

0

15

31
33

D12

D7

A4

28

D5

14

24

SDA

35
37

D3

A1

37

2
4
6
8
1

36
38

27

D11

16
18

23
25

32

20

11

19

S15

2

D0

S1

S10

A3

4

3

S20

A5

6

D1

SCL

10

A5

TXD/D1

D2

3

CN8

A4

A2

S2

GND

7

S3

CLOSED

U8_Sn

M95_MISO

M95_Hn

AREF

9

SDA

2

A4

5

U5_Sn

S13

D4

5

S7

GND

6

CLOSED

MOSI/PWM/D11

5

8

A0

D7
D6

M24_WC

S5

IOREF

AREF

A0

1

D3

4

CN6

VIN

8

MISO/D12

6

D12

D13

A1

A3

D8

S4

D9

D11

D6

7

CN5_3_U7_Sn

SCK/D13

GND

7

M24_I2C_SDA

RESET

M24_I2C_SCL

M95_MOSI

D5

6

A2

3

OPEN

D2

4

3V3

PWM/D10

4

D7

8

D8

1

5V

CN5

S6

RXD/D0

2

D3

A1

2

5V

5

M95_WPn

3V3

NC

1

Vin

M95_SCLK

D10

U6_Sn

S11

1

D5
D4

CN9

RESET

PWM/D9

3

OPEN

OPEN

OPEN

CLOSED

CLOSED
CLOSED
CLOSED
CLOSED
CLOSED

SCL
SDA

UM2665 - Rev 3

Figure 9. X-NUCLEO-EEPRMA2 circuit schematic (3 of 4)

Figure 10. X-NUCLEO-EEPRMA2 circuit schematic (4 of 4)

page 18/23

Schematic diagrams

UM2665

Revision history

Date Revision Changes

03-Dec-2019 1 Initial release.

27-Feb-2020 2

28-Aug-2020 3 Updated Section 2.1 Overview.

UM2665

Table 13. Document revision history

Updated Figure 1. X-NUCLEO-EEPRMA2 expansion board and Figure 2. X-NUCLEO-EEPRMA2
expansion board connected to an STM32 Nucleo development board.

UM2665 - Rev 3

page 19/23

UM2665

Contents

Contents

1 Acronyms and abbreviations ......................................................2

2 Getting started ....................................................................3

2.1 Overview .....................................................................3

2.2 Typical applications.............................................................3

2.3 Hardware requirements .........................................................4

2.4 System requirements ...........................................................4

2.5 Board setup ...................................................................4

3 Hardware description and configuration ...........................................6

3.1 Interconnection details ..........................................................6

3.2 Current measurement...........................................................8

3.3 X-NUCLEO-EEPRMA2 component placement details ................................9

4 Component description ...........................................................11

4.1 M24XX ......................................................................11

4.2 M95XX ......................................................................11

5 External EEPROMs ...............................................................13

6 Bill of materials...................................................................14

7 Schematic diagrams ..............................................................16

Revision history .......................................................................19

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page 20/23

UM2665

List of tables

List of tables

Table 1. List of acronyms ....................................................................2

Table 2. X-NUCLEO-EEPRMA2 and NUCLEO-L053R8 connection details (left connector) .......................6

Table 3. X-NUCLEO-EEPRMA2 and NUCLEO-L053R8 connection details (right connector) ......................7

Table 4. X-NUCLEO-EEPRMA2 and NUCLEO-F401RE connection details (left connector) .......................7

Table 5. X-NUCLEO-EEPRMA2 and NUCLEO-F401RE connection details (right connector) ......................8

Table 6. M24C02 details .................................................................... 11

Table 7. M24256 details .................................................................... 11

Table 8. M24M01 details .................................................................... 11

Table 9. M95040 details .................................................................... 11

Table 10. M95256 details .................................................................... 11

Table 11. M95M04 details .................................................................... 12

Table 12. X-NUCLEO-EEPRMA2 bill of materials .................................................... 14

Table 13. Document revision history .............................................................19

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UM2665

List of figures

List of figures

Figure 1. X-NUCLEO-EEPRMA2 expansion board ..................................................1

Figure 2. X-NUCLEO-EEPRMA2 expansion board connected to an STM32 Nucleo development board .............4

Figure 3. X-NUCLEO-EEPRMA2 component placement details .........................................9

Figure 4. X-NUCLEO-EEPRMA2 top view layout ...................................................9

Figure 5. X-NUCLEO-EEPRMA2 bottom view layout................................................ 10

Figure 6. I2C and SPI EEPROM soldered on the X-NUCLEO-EEPRMA2 expansion board ..................... 13

Figure 7. X-NUCLEO-EEPRMA2 circuit schematic (1 of 4)............................................ 16

Figure 8. X-NUCLEO-EEPRMA2 circuit schematic (2 of 4)............................................ 17

Figure 9. X-NUCLEO-EEPRMA2 circuit schematic (3 of 4)............................................ 18

Figure 10. X-NUCLEO-EEPRMA2 circuit schematic (4 of 4)............................................ 18

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UM2665

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