ST X-NUCLEO-53L8A1 Manuale utente

Introduction

The X-NUCLEO-53L8A1 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 based on the

VL53L8 series Time-of-Flight sensors.

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

VL53L8 applications with Bluetooth or Wi-Fi interfaces.

Figure 1. X-NUCLEO-53L8A1 expansion board, spacers, cover glass holder, and oval cover glass

Getting started with the X-NUCLEO-53L8A1 Time-of-Flight expansion board

based on the VL53L8 series for STM32 Nucleo

UM3120

User manual

UM3120 - Rev 1 - March 2023

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-53L8A1

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

Figure 2. Electrostatic logo

1.1.2 Laser safety considerations

The VL53L8CX 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.

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

focusing the laser beam.

Caution: Use of controls or adjustments, or performance of procedures other than those specified herein may result in

hazardous radiation exposure.

Figure 3. Class 1 laser product label

Figure 4. Laser notice 56: applies to IEC 60825-1:2014

1.2 Features

•VL53L8CX, low-power, high performance 8x8 multizone Time of-Flight sensor

• Hideable behind a dark cover window

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

• Up to 400 cm ranging

UM3120

Getting started

UM3120 - Rev 1 page 2/23

• Histogram-based technology

• I²C (up to 1 MHz) or SPI (up to 20 MHz) interface

• 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

1.3 VL53L8 series Time-of-Flight sensor characteristics

• Laser wavelength : 940 nm

• Invisible laser radiation

• Maximum laser power emitted : 215 mW

• Integration time : 2 ms minimum

1.4 Spacers and covers

The X-NUCLEO-53L8A1 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

VL53L8 and the rectangular-shaped cover glass;

• two twelve-pin headers that allow connecting the two mini PCB of the SATEL boards to the X-

NUCLEO-53L8A1 expansion board through flying wires.

Attention: The VL53L8 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 PCB version Core product

X-NUCLEO-53L8A1A X$NUCLEO-53L8A1A VL53L8

1.6 Ordering information for the VL53L8 series Time-of-Flight sensors

This board is equipped with a noncommercial VL53L8CA evaluation purposes only Time of Flight sensor. Its

equivalent orderable products are listed in the following table. For a detailed description of each sensor, please

refer to its datasheet on the product web page. Additional information is available from the user manual and

collateral documents of the target ToF sensor.

Table 2. VL53L8 series ordering information

RPN CPN Datasheet Features

VL53L8CX VL53L8CXV0GC/1 DS14161 Low-power high-performance 8x8

multizone Time-of-Flight

UM3120

VL53L8 series Time-of-Flight sensor characteristics

UM3120 - Rev 1 page 3/23

2Using the expansion board

The X-NUCLEO-53L8A1 expansion board allows the user to test the VL53L8 sensor functionality, to program it

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

The X-NUCLEO-53L8A1 integrates:

• the VL53L8 sensor;

• Arduino UNO R3 connectors;

• Connectors for SATEL-VL53L8 optional breakout boards;

Important: Program a microcontroller to control the VL53L8CX 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-53L8A1 expansion board can be connected to the STM32 Nucleo development board through

the Arduino UNO R3 connectors (CN5, CN6, CN8, and CN9).

I²C (up to 1 MHz) and SPI (up to 20 MHz) interfaces are available on the X-NUCLEO-53L8A1 expansion board.

The user can choose between the two using the J9 jumper to configure the SPI_I2C_N signal as depicted in the

following picture.

Figure 5. Use onboard jumper J9 to select between I2C and SPI interfaces

UM3120

Using the expansion board

UM3120 - Rev 1 page 4/23

3Breakout boards

The X-NUCLEO-53L8A1 package does not include the VL53L8 breakout boards.

You can purchase them in a pack of two PCBs as SATEL-VL53L8.

For mechanical integration purposes, it could be interesting to use the mini PCB by breaking the SATEL-VL53L8

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 6. SATEL-VL53L8

The SATEL-VL53L8 boards cannot be directly plugged onto the X-NUCLEO-53L8A1 through the two 6-pin

headers (see Figure 7).

They can be connected to the X-NUCLEO-53L8A1 by using the mini PCB through flying wires (see

Figure 9. VL53L8 mini PCB flying wire connection to the X-NUCLEO-53L8A1 expansion in SPI mode. J9 jumper

with pin 1 and 2 connected).

The schematic can be duplicated for the sensor on the right allowing the use of both mini PCB.

UM3120

Breakout boards

UM3120 - Rev 1 page 5/23

Figure 7. SATEL-VL53L8 breakout boards can not be connected to the X-NUCLEO-53L8A1 expansion

board

Figure 8. VL53L8 mini PCB flying wire connection to the X-NUCLEO-53L8A1 expansion board in I2C

mode. J9 jumper with pin 2 and 3 connected

UM3120

Breakout boards

UM3120 - Rev 1 page 6/23

Figure 9. VL53L8 mini PCB flying wire connection to the X-NUCLEO-53L8A1 expansion in SPI mode. J9

jumper with pin 1 and 2 connected

UM3120

Breakout boards

UM3120 - Rev 1 page 7/23

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

X-NUCLEO-53L8A1

To evaluate the VL53L8 device performance, use the related GUI or the X-CUBE-TOF1.

The X-NUCLEO-53L8A1 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-53L8A1 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-53L8A1 web page) or the X-CUBE-TOF1 to

evaluate the VL53L8.

UM3120

Graphical user interface (GUI) and programming example for the X-NUCLEO-53L8A1

UM3120 - Rev 1 page 8/23

5Schematic diagrams

Note: These schematic diagrams refer to the board latest version.

Figure 10. X-NUCLEO-53L8A1 circuit schematic (1 of 5)

MISO

MOSI_SDA

NCS

MCLK_SCL

GPIO1

GPIO2

LPn

SPI_I2C_N

Sensor

Sensor.SchDoc

MCLK_SCL

SPI_I2C_N

PWR_EN

NCS

GPIO1

GPIO2

MOSI_SDA

MISO

LPn

Right

Satellite_Connector.SchDoc

MOSI_SDA

GPIO1

MCLK_SCL

GPIO2

IO_MCLK_SCL

IO_MOSI_SDA

MISOIO_MISO

NCSIO_NCS

IO_LPn LPn

IO_GPIO1

IO_GPIO2

IO_LPn_LEFT

IO_GPIO1_RIGHT

IO_GPIO1_LEFT GPIO1_LEFT

IO_GPIO2_LEFT

LPn_RIGHTIO_LPn_RIGHT

IO_GPIO2_RIGHT

GPIO1_RIGHT

GPIO2_LEFT

LPn_LEFT

GPIO2_RIGHT

NCS_LEFT

NCS_RIGHT

IO_NCS_LEFT

IO_NCS_RIGHT

Level Shifters

Level_Shifters.SchDoc

MCLK_SCL

SPI_I2C_N

PWR_EN

NCS

GPIO1

GPIO2

MOSI_SDA

MISO

LPn

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

Host.SchDoc

PWR_EN

Power

Power.SchDoc

3V3

J7[1-2]

J8[1-2]

J9[2-3]

R40

R41

IOVDD

R18

2.2k

R19

2.2k

TP1

TP2

TP3

FIDUCIAL

PWR_EN_Right

PWR_EN_Left

PWR_EN_Sensor

SILK

SPI_I2C_N

[1-2] : SPI

[2-3] : I2C

GND1

Clip

GND2

Clip

FIDUCIAL

One jumper for all devices

SILK

[1-2] : I2C

[2-3] : SPI

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.

UM3120 - Rev 1 page 9/23

UM3120

Schematic diagrams

Figure 11. X-NUCLEO-53L8A1 circuit schematic (2 of 5)

3V3_NUCLEO5V_NUCLEO

PB8

PB9

PC7

PB10

PB4

PB5

PA10

PA2

PA3

PA1

PA0

PA4

PB0

PC1

PC0

PA9

PB6

PA7

PA6

PA5

PB3

PA8

CN6

CN5

2.54mm, T/H, Vert

CN9

2.54mm, T/H, Vert

CN8

2.54mm, T/H, Vert

Nucleo Arduino connectors

HDR 8x1 Male 2.54mm

UM3120 - Rev 1 page 10/23

UM3120

Schematic diagrams

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