ST X-NUCLEO-53L7A1 Manuale utente

Introduction

The X-NUCLEO-53L7A1 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

VL53L7CX Time-of-Flight 8x8 multizone ranging sensor with 90° FoV.

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

VL53L7CX applications with Bluetooth or Wi-Fi interfaces.

Figure 1. X-NUCLEO-53L7A1 expansion board, spacers, cover glass holder, and oval cover glass

Getting started with the X-NUCLEO-53L7A1 expansion board for STM32 Nucleo

based on the VL53L7CX

UM3067

User manual

UM3067 - Rev 1 - October 2022

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-53L7A1

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

Figure 2. Electrostatic logo

1.1.2 Laser safety considerations

The VL53L7CX 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

•VL53L7CX Time-of-Flight 8x8 multizone ranging sensor with 90° FoV

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

• Up to 350 cm ranging

• Histogram-based technology

• Multiobject detection capability

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

• One cover glass 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

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Getting started

UM3067 - Rev 1 page 2/22

1.3 VL53L7CX Time-of-Flight sensor characteristics

• Laser wavelength: 940 nm

•Invisible laser radiation

• Maximum laser power emitted: 130 mW

• Integration time: 2 ms minimum

1.4 Spacers and covers

The X-NUCLEO-53L7A1 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

VL53L7CX and the rectangular-shaped cover glass;

• two nine-pin headers that allow connecting the two breakout boards to the X-NUCLEO-53L7A1 expansion

board.

Attention: The VL53L7CX is delivered with a liner to prevent potential foreign material from piercing the module holes

during the assembly process. Remove this liner before use.

1.5 Ordering information

Table 1. Ordering information

Order code Core product

X-NUCLEO-53L7A1 VL53L7CX

UM3067

VL53L7CX Time-of-Flight sensor characteristics

UM3067 - Rev 1 page 3/22

2Simplified schematic

Figure 4. X-NUCLEO-53L7A1 expansion board - simplified schematic

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Simplified schematic

UM3067 - Rev 1 page 4/22

3Using the expansion board

The X-NUCLEO-53L7A1 expansion board allows the user to test the VL53L7CX sensor functionality, to program it

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

The X-NUCLEO-53L7A1 integrates:

• the VL53L7CX sensor;

• Arduino UNO R3 connectors;

• Connectors for SATEL-VL53L7CX optional breakout boards;

Important: Program a microcontroller to control the VL53L7CX 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-53L7A1 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.

UM3067

Using the expansion board

UM3067 - Rev 1 page 5/22

4Breakout boards

The X-NUCLEO-53L7A1 package does not include the VL53L7CX breakout boards.

You can purchase them in a pack of two PCBs as SATEL-VL53L7CX.

The X-NUCLEO-53L7A1 supplies the VL53L7CX 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-

VL53L7CX 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-VL53L7CX

The SATEL-VL53L7CX boards can be directly plugged onto the X-NUCLEO-53L7A1 through the two 9-pin

headers (see Figure 6. SATEL-VL53L7CX breakout boards connected to the X-NUCLEO-53L7A1 expansion

board).

As an alternative, they can be connected to the X-NUCLEO-53L7A1 by using the mini PCB through flying wires

(see Figure 7).

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Breakout boards

UM3067 - Rev 1 page 6/22

Figure 6. SATEL-VL53L7CX breakout boards connected to the X-NUCLEO-53L7A1 expansion board

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Breakout boards

UM3067 - Rev 1 page 7/22

Figure 7. VL53L7CX mini PCB flying wire connection to the X-NUCLEO-53L7A1 expansion board

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Breakout boards

UM3067 - Rev 1 page 8/22

5Graphical user interface (GUI) and programming example for the

X-NUCLEO-53L7A1

To evaluate the VL53L7CX device performance, use the related GUI.

The X-NUCLEO-53L7A1 expansion board requires the NUCLEO-F401RE development board to use the GUI.

Important: Despite the fact that the X-NUCLEO-53L7A1 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-53L7A1 web page) to evaluate the

VL53L7CX.

UM3067

Graphical user interface (GUI) and programming example for the X-NUCLEO-53L7A1

UM3067 - Rev 1 page 9/22

6Schematic diagrams

Figure 8. X-NUCLEO-53L7A1 circuit schematic (1 of 5)

INT

LPn

SCL

SDA

I2C_RST

PWR_EN

Sensor.SchDoc

PWR_EN

INT

LPn

SDA

I2C_RST

SCL

Right

Satellite Connector.SchDoc

PWR_EN

INT

LPn

SCL

I2C_RST

SDA

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

UM3067

Schematic diagrams

UM3067 - Rev 1 page 10/22

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