ST X-NUCLEO-53L4A2 Manuale utente

Introduction

The X-NUCLEO-53L4A2 is an expansion board for any STM32 Nucleo development board equipped with the Arduino R3

connectors. It provides a complete evaluation kit that allows you to learn, evaluate, and develop applications using the

VL53L4CX Time-of-Flight sensor with extended range measurement.

The expansion board is delivered with a cover glass holder in which you can fit three different spacers of 0.25, 0.5, and 1 mm

height below the cover glass to simulate various air gaps. A small oval cover glass fitting the sensor is included.

Several ST expansion boards can be stacked through the Arduino connectors, which allow, for example, the development of

VL53L4CX applications with Bluetooth or Wi-Fi interfaces.

Figure 1. X-NUCLEO-53L4A2 expansion board, spacers, cover glass holder, and oval cover glass

Getting started with the X-NUCLEO-53L4A2 expansion board for STM32 Nucleo

based on the VL53L4CX

UM2976

User manual

UM2976 - Rev 1 - December 2021

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

1Getting started

1.1 Safety considerations

1.1.1 Electrostatic precautions

Warning:

Take electrostatic precautions, including ground straps, when using the X-NUCLEO-53L4A2

expansion board. Failure to prevent electrostatic discharge could damage the device.

Figure 2. Electrostatic logo

1.1.2 Laser safety considerations

The VL53L4CX contains a laser emitter and the corresponding drive circuitry.

The laser output is designed to remain within Class 1 laser safety limits under all reasonable foreseeable

conditions, including single faults, in compliance with the IEC 60825-1:2014 (third edition).

The laser output remains within Class 1 limits as long as you use the STMicroelectronics recommended device

settings and respect the operating conditions specified in the data sheet.

The laser output power must not be increased and no optics should be used with the intention of focusing the

laser beam.

Figure 3. Class 1 laser product label

1.2 Features

•VL53L4CX Time-of-Flight sensor with extended range measurement

• Accurate absolute ranging distance, independent of the reflectance of the target

• 0.25, 0.5, and 1 mm spacers to simulate air gaps

• Two different cover windows to protect the sensor from dust

• Compatible with STM32 Nucleo development boards

• Equipped with Arduino UNO R3 connectors

• Full system software supplied, including code examples and graphical user interface

• RoHS, CE, UKCA, and China RoHS compliant

UM2976

Getting started

UM2976 - Rev 1 page 2/22

1.3 Spacers and covers

The X-NUCLEO-53L4A2 expansion board is delivered with:

•three spacers of 0.25 mm, 0.5 mm, and 1 mm height, used to simulate different air gaps between the

VL53L4CX and the rectangular-shaped cover glass;

• an oval-shaped cover glass to simulate the integration of the VL53L4CX into the customer's final product;

• two six-pin headers that allow connecting the two breakout boards to the X-NUCLEO-53L4A2 expansion

board.

Attention: The VL53L4CX is delivered with a liner to prevent potential foreign material from piercing the module holes

during the assembly process. Remove this liner before use.

UM2976

Spacers and covers

UM2976 - Rev 1 page 3/22

1.4 Simplified schematic

Figure 4. X-NUCLEO-53L4A2 expansion board - simplified schematic

D7 / PA8 8

D6 / PB10

D5 / PB4

D4 / PB5

D3 / PB3

D2 / PA10

D1 / PA2

D0 / PA3

CN9

ARDUINO HEADERS

D15 / PB8

D14 / PB9

D13 / PA5

D12 / PA6

D11 / PA7

D9 / PC7

D10 / PB6

D8 / PA9

CN5

GND

SCL

SDA

A0 / PA0

A1 / PA1

A2 / PA4

A3 / PB0

A4 / PC1

A5 / PC0

CN8

CN6

GND

+5V

+3V3

ARDUINO/F401RE

AVDD

VIN

NRST

IOREF

SDA

SCL

3.3V

GND

XSHUT

GPIO1

SDA

SCL

3.3V

GND

GPIO1

XSHUT

SDA

SCL

3.3V

GND

GPIO1

XSHUT

NUCLEO-F401RE

J4_Left

Satellite

Left header

J4_Right

Satellite

Right header 1

VL53L4CX

UM2976

Simplified schematic

UM2976 - Rev 1 page 4/22

2Using the expansion board

The X-NUCLEO-53L4A2 expansion board allows the user to test the VL53L4CX sensor functionality, to program it

and to understand how to develop an application using this sensor.

The X-NUCLEO-53L4A2 integrates:

• the VL53L4CX sensor;

• Arduino UNO R3 connectors;

• Connectors for SATEL-VL53L4CX optional breakout boards;

Important: Program a microcontroller to control the VL53L4CX through the I2C bus.

The application software and an example of the C-ANSI source code are available on the sensor web page.

The X-NUCLEO-53L4A2 expansion board can be connected to the STM32 Nucleo development board through

the Arduino UNO R3 connectors (CN5, CN6, CN8, and CN9) as shown in Figure 4.

UM2976

Using the expansion board

UM2976 - Rev 1 page 5/22

3Breakout boards

The X-NUCLEO-53L4A2 package does not include the VL53L4CX breakout boards.

You can purchase them in a pack of two PCBs as SATEL-VL53L4CX.

The X-NUCLEO-53L4A2 supplies the VL53L4CX breakout boards at 3.3 V (see Figure 4).

For mechanical integration purposes, it could be interesting to use the mini PCB by breaking the SATEL-

VL53L4CX along the red line as shown in the figure below. It is easier to integrate this setup into a customer's

device thanks to its small size.

Figure 5. SATEL-VL53L4CX

The SATEL-VL53L4CX boards can be directly plugged onto the X-NUCLEO-53L4A2 through the two 6-pin

headers (see Figure 6).

As an alternative, they can be connected to the X-NUCLEO-53L4A2 by using the mini PCB through flying wires

(see Figure 7).

UM2976

Breakout boards

UM2976 - Rev 1 page 6/22

Figure 6. SATEL-VL53L4CX breakout boards connected to the X-NUCLEO-53L4A2 expansion board

UM2976

Breakout boards

UM2976 - Rev 1 page 7/22

Figure 7. VL53L4CX mini PCB flying wire connection to the X-NUCLEO-53L4A2 expansion board

UM2976

Breakout boards

UM2976 - Rev 1 page 8/22

4Graphical user interface (GUI) and programming example for the

X-NUCLEO-53L4A2

To evaluate the VL53L4CX device performance, use the related GUI or the X-CUBE-TOF1.

The X-NUCLEO-53L4A2 expansion board requires the NUCLEO-F401RE development board to use the GUI or

run the ranging examples included in the X-CUBE-TOF1.

Important:

Despite the fact that the X-NUCLEO-53L4A2 can be stacked on any STM32 Nucleo board equipped the Arduino R3

connectors, the GUI is designed to work with the NUCLEO-F401RE only.

Download the GUI (in the Tools and Software tab of the X-NUCLEO-53L4A2 web page) or the X-CUBE-TOF1 to

evaluate the VL53L4CX.

UM2976

Graphical user interface (GUI) and programming example for the X-NUCLEO-53L4A2

UM2976 - Rev 1 page 9/22

5Schematic diagrams

Figure 8. X-NUCLEO-53L4A2 circuit schematic (1 of 6)

SCL

SDA

XSHUT

GPIO1

Sensor.SchDoc

SDA

SCL

XSHUT

GPIO1

Right

Satellite Connector.SchDoc

SCL

SDA

XSHUT

GPIO1

Left

Satellite Connector.SchDoc

PA1

PA0

PA3

PA4

PA2

PA6

PA5

PA7

PA8

PA10

PA9

PC1

PC0

PC7

PB0

PB10

PB6

PB5

PB4

PB3

PB8

PB9

Host.SchDoc

3V3

2.2k

LCD_SCL

LCD_SDA

Display Connector.SchDoc

3V3

2.2k

Note: The display connector is an optional connector to connect an SSD1306 I2C OLED display to output the ranging

data or other meaningful information if required. The related application note and example code will be available

on st.com.

UM2976

Schematic diagrams

UM2976 - Rev 1 page 10/22

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