ST X-NUCLEO-SAFEA1B Mode d'emploi

Introduction

The X-NUCLEO-SAFEA1B expansion board is based on the STSAFE-A110 secure element. It can be used with any STM32

Nucleo development board.

The on-board STSAFE-A110 is customized with a standard profile for evaluation and is compatible with the Arduino UNO R3

connector.

The X-NUCLEO-SAFEA1B expansion board is used with free X-CUBE-SAFEA1 or X-CUBE-SBSFU software packages

containing sample code to demonstrate how to implement security applications.

Figure 1. X-NUCLEO-SAFEA1B

How to use STM32 Nucleo expansion board based on the STSAFE-A110 secure

element

UM3195

User manual

UM3195 - Rev 1 - June 2023

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

1 Getting started

1.1 Hardware requirements

The X-NUCLEO-SAFEA1B expansion board can be connected to any STM32 Nucleo development board through

the matching Arduino UNO R3 connector pins.

Note: Handle the X-NUCLEO-SAFEA1B with care and avoid bending or damaging the pins as the board has male/

female pass-through connectors and ESD sensitive components.

1.2 System requirements

To complete the system setup, you need:

• a PC running Windows version 7, 8 or 10

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

• software package (X-CUBE-SAFEA1 or X-CUBE-SBSFU) installed on the user PC

• one of the compatible software development environments: IAR, Arm Keil, AC6, or Atolic

UM3195

Getting started

UM3195 - Rev 1 page 2/16

2 Hardware description

The X-NUCLEO-SAFEA1B expansion board has an embedded STSAFE-A110 secure element to allow you to

evaluate its authentication and data management services connected to a local or remote host.

This STSAFE-A110 is factory personalized with a generic sample profile.

The main features of the X-NUCLEO-SAFEA1B expansion board are:

• On-board STSAFE-A110 customized with a standard evaluation profile

• HE10 extension connector to mount additional STSAFE devices

• Arduino UNO R3 connector

• Free drivers, middleware and software samples compatible with the STM32 ODE

• RoHS and WEEE compliant

The X-NUCLEO-SAFEA1B interfaces with the STM32 Nucleo microcontrollers via the I²C communication bus.

2.1 Jumpers and solder bridges

Table 1. X-NUCLEO-SAFEA1B expansion board jumper and solder bridge functions

Jumper Alternative soldering point function

P1 SB13 Connects embedded LD3 green LED to STM32 Nucleo board

P4 SB1 Connects embedded 2.2kΩ pull-ups to I²C bus for SCL

P5 SB2 Connects embedded 2.2kΩ pull-ups to I²C bus for SDA

P7 Can be used to put STSAFE-A110 secure element in reset mode

SB5 Can be used to drive the STSAFE-A110 reset pin via the STM32 MCU PC0 GPIO

2.2 Connector

X-NUCLEO-SAFEA1B Nucleo expansion board has an HE10 extension connector (J2) to mount an additional

STSAFE-A1xx secure element.

Note: If you use the connector to accommodate new generation STSAFE-A devices, be sure that you insert jumper P7

to place the current STSAFE-A110 secure element soldered on the board in reset mode.

UM3195

Hardware description

UM3195 - Rev 1 page 3/16

3 STM32L4 series microcontroller software

The STM32 ODE software package X-CUBE-SAFEA1 provides demonstration source code for a NUCLEO-

L476RG development board with X-NUCLEO-SAFEA1B expansion. The X-CUBE-SAFEA1 package includes

drivers, middleware and several demonstration codes that implement the features of the STSAFE-A110 device

through a host microcontroller. The demonstration codes use the STSAFE-A1xx middleware built on the

STM32Cube software technology. They illustrate authentication, key pair generation, key establishment, local

envelope wrapping and pairing features.

Another package, called X-CUBE-SBSFU, provides demonstration source code for Secure Boot and Secure

Firmware Update solution. It updates of the STM32 microcontroller firmware with new features and addresses

potential issues. The update process is a secure operation using the STSAFE-A110 to prevent unauthorized

updates and access to confidential on-device data. It is available for the STM32L4 Series microcontrollers with

examples provided for the B-L475E-IOT01A discovery kit with the X-NUCLEO-SAFEA1B expansion.

UM3195

STM32L4 series microcontroller software

UM3195 - Rev 1 page 4/16

4 Schematic diagrams

Figure 2. X-NUCLEO-SAFEA1 circuit schematic - STSAFE-A chips

4GND

SCL 7

IC4

GND

3NC

3V3

NC 6

3V3

1RST

VCC

RESET-C2

3V3

100nF/25V

STSAFE-A110 UFDFPN8 3x2

IC1

SDA 5

GND

SDA 5

SCL

IC2

GND

STSAFE-A110 SO8N

2VCC

3NC

2VCC

SDA

RESET-C1

SDA

STSAFE-A110 UFDFPN8 3x2

SCL

RESET-C1

GND

RST

NC 6

RST 8

SCL

SCL 2VCC

SCL

NC 8

SCL

RESET-C2

SDA

RST 8

IC3

1NC

NC 6

GND

SDA

STSAFE-A110 SO8N

SCL 7

NC 8

3V3

4GND

GND

NC 6

SDA 5

UM3195 - Rev 1 page 5/16

UM3195

Schematic diagrams

Figure 3. X-NUCLEO-SAFEA1 circuit schematic - Arduino and morpho connectors

morpho connector

CN10

CN9

PA9

GND

21 22

CN6

3V3

Arduino connector

Header 19x2

3 5

GND

21 22

SPI_CLK

29 30

23 24

35 36

PC0

PC1

CN5

SPI_MOSI

SPI_MISO

SPI_NSS 16 6

Header 19x2

CN8

CN7

PA10

E5V

PA11

PA12

PH1

PH0

morpho connector

SDA

SCL

CN5-6

35 36

1817

23 24

Arduino connector

Arduino connector Arduino connector

UM3195 - Rev 1 page 6/16

UM3195

Schematic diagrams

Figure 4. X-NUCLEO-SAFEA1 circuit schematic - LEDs and jumpers

2K2

1KR

PC0

(CN8-Pin 6)

LD3

SDA

3V3

RST1

SDA

SCL pull-up

SCL

61.9R

Amber LED

RESET-C1

SDA pull-up

GND

3V3

CN5-6

3V33V3

SPI_MOSI

SB5

Sel SCL Sel SDA

pull-up

RST1 CMD

pull-up

SPI_MISO

SPI_CLK

SPI_NSS

820R

3V3

User Led

Header 5X2 male

GND

SCL

(CN5-Pin 9)

SB13

LD1

2K2

(CN5-Pin 10)

Green LED

SB2

SB1

UM3195 - Rev 1 page 7/16

UM3195

Schematic diagrams

5 Bill of materials

Table 2. X-NUCLEO-SAFEA1B bill of materials

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

1 1 C2

0.1 µF 0603 [1608

Metric] 25 V ± 10 %

SMD X7R

Multilayer ceramic

capacitor Multicomp MC0603B104K250CT

2 0 C3 0.1 µF 0603 [1608

Metric] 25 V ± 10 %

Multilayer ceramic

capacitor (not

mounted)

Multicomp MC0603B104K250CT

3 0 C4, C5

22 pF 0603 [1608

Metric] 50 V ± 5%

C0G/NP0

Multilayer ceramic

capacitors (not

mounted)

Multicomp MC0603N220J500CT

4 1 CN5

Vertical, 2.54 mm, 10

contacts, receptacle,

ESQ series, through

hole

Board-to-board

connector SAMTEC ESQ-110-24-T-S

5 1 CN6

Vertical, 2.54 mm, 8

contacts, receptacle,

ESQ series, through

hole

Board-to-board

connector SAMTEC ESQ-108-24-T-S

6 0 CN7

Vertical, 2.54 mm, 38

contacts, receptacle,

ESQ series, through

hole

Board-to-board

connector (not

mounted)

SAMTEC ESQ-119-14-G-D

7 1 CN8

Vertical, 2.54 mm, 6

contacts, receptacle,

ESQ series, through

hole

Board-to-board

connector SAMTEC ESQ-106-24-T-S

8 1 CN9

Vertical, 2.54 mm, 8

contacts, receptacle,

ESQ series, through

hole

Board-to-board

connector SAMTEC ESQ-108-24-T-S

9 0 CN10

Vertical, 2.54 mm, 38

contacts, receptacle,

ESQ series, through

hole

Board-to-board

connector (not

mounted)

SAMTEC ESQ-119-14-G-D

10 1 IC1 STSAFE-A110 SO8N

Authentication and

brand protection

secure solution

ST STSAFA110DFSPL03

11 0 IC2 STSAFE-A110 SO8N

Authentication and

brand protection

secure solution (not

mounted)

ST STSAFA110DFSPL03

12 0 IC3, IC4 STSAFE-A110 DFN23

Authentication and

brand protection

secure solution (not

mounted)

ST STSAFA110DFSPL03

13 1 LD1 SM0805AC, 6MCD,

607 Amber LED Bivar Inc. SM0805AC

14 0 LD2 SM0805AC, 6MCD,

607

Amber LED (not

mounted) Bivar Inc. SM0805AC

15 1 LD3 1.8 V 2 mA 570 nm Green LED OSRAM LGT67K-H2K1-24-Z

16 0 J1

Receptacle, 5 ways,

surface mount, right

angle

USB connector,

shielded, Micro

USB Type B, USB

2.0 (not mounted)

MOLEX 47346-0001

UM3195

Bill of materials

UM3195 - Rev 1 page 8/16

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

17 1 J2

2.54 mm, 10 contacts,

header, 303 Series,

through hole, 2 rows

Wire-to-board

connector 3M 30310-6002HB

18 1 P7, P8 473, 80 way, 2 row,

straight pin header Connector Stelvio Kontek 613080262822

19 1 R1 61.9 ohm 0603 [1608

Metric] 75 V 100 mW Thick film resistor MULTICOMP MCWR06X61R9FTL

20 0 R2 680 ohm 0603 [1608

Metric] 50 V 100 mW

Thick film resistor

(not mounted) MULTICOMP MCWR06X6800FTL

21 4 R3, R4, R7,

2.2 kohm 0603 [1608

Metric] 50 V 100 mW

SMD

Chip resistors MULTICOMP MCWR06X2201FTL

22 1 R5 1 kohms 0603 [1608

Metric] ±1% Resistor MULTICOMP MCMR06X1001FTL

23 0 R6 1 kohms 0603 [1608

Metric] ±1%

Resistor (not

mounted) MULTICOMP MCMR06X1001FTL

24 3 SB1, SB2,

SB13

0 ohm 0603 [1608

Metric] 75 V 100 mW Chip resistor Vishay CRCW06030000Z0EA

25 0 SB3, SB10,

SB11, SB12

0 ohm 0603 [1608

Metric] 75 V 100 mW

Chip resistor (not

mounted) Vishay CRCW06030000Z0EA

26 0 X1

8 MHz, through hole,

11.5 mm x 5 mm, 10

ppm, 18 pF, 10 ppm,

9B Series

9B-8.000MEEJ-B -

Crystal, TXC Corp. 9B-8.000MEEJ-B

UM3195

Bill of materials

UM3195 - Rev 1 page 9/16

6 Board versions

Table 3. X-NUCLEO-SAFEA1 versions

CPN Finished good Schematic diagrams Bill of materials

X-NUCLEO-SAFEA1B X$NUCLEO-SAFEA1B (1) X$NUCLEO-SAFEA1B

schematic diagrams

X$NUCLEO-SAFEA1B bill of

materials

1. This code identifies the X-NUCLEO-SAFEA1B evaluation board first version.

UM3195

Board versions

UM3195 - Rev 1 page 10/16

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