ST X-NUCLEO-53L3A2 Manuale utente

Introduction

This document provides detailed hardware information on the X-NUCLEO-53L3A2 expansion board. This expansion board is

compatible with the STM32 Nucleo family and the Arduino™ electronic boards. It is designed around the VL53L3CX ranging

sensor and is based on the ST patented FlightSense technology.

To allow the user to validate the VL53L3CX in an environment as close as possible to its final application, the

X‑NUCLEO-53L3A2 expansion board is delivered with a holder in which three different height spacers of 0.25 mm, 0.5 mm, and

1 mm can be fitted with the cover glass above the spacer. The height spacers are used to simulate different air gap distances

between the VL53L3CX sensor and the cover glass.

The X-NUCLEO-53L3A2 expansion board is delivered with two VL53L3CX breakout boards.

Getting started with X-NUCLEO-53L3A2 multi target ranging ToF sensor

expansion board based on VL53L3CX for STM32 Nucleo

UM2757

User manual

UM2757 - Rev 2 - April 2021

For further information contact your local STMicroelectronics sales office.

www.st.com

Figure 1. X-NUCLEO-53L3A2 expansion board, spacers, cover glass, and breakout boards

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UM2757 - Rev 2 page 2/17

1Overview

The X-NUCLEO-53L3A2 expansion board features the VL53L3CX ranging sensor, based on ST’s FlightSense,

Time-of-Flight (ToF) technology.

It is compatible with the STM32 Nucleo development board family, and with the Arduino UNO R3 connector

layout.

Several ST expansion boards can be stacked through the Arduino connectors, which allows, for example, the

development of VL53L3CX applications with Bluetooth or Wi-Fi interfaces.

The X-NUCLEO-53L3A2 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

VL53L3CX and the cover glass.

• Two cover windows to simulate the integration of the VL53L3CX into the customer’s final product.

• Two VL53L3CX breakout boards which can be plugged onto the X-NUCLEO-53L3A2 expansion board or

connected through flying wires to the X-NUCLEO-53L3A2 expansion board.

• Two 10-pin connectors to enable the customer to connect the two breakout boards onto the X-

NUCLEO-53L3A2 expansion board.

Note: The VL53L3CX is delivered with a liner to prevent potential foreign material from penetrating inside the module

holes during the assembly process. This liner must be removed at the latest possible step during final assembly,

before module calibration.

Table 1. Ordering information

Order code Description

X-NUCLEO-53L3A2 STM32 Nucleo expansion board - spacers and glass - two breakout boards

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Overview

UM2757 - Rev 2 page 3/17

2Document references

Table 2. Document references

Description DocID

VL53L3CX datasheet DS13204

X-NUCLEO-53L3A2 data brief DB4226

P-NUCLEO-53L3A2 data brief DB4194

X-CUBE-53L3A2 data brief DB4193

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Document references

UM2757 - Rev 2 page 4/17

3X-NUCLEO-53L3A2 expansion board

This section describes the X-NUCLEO-53L3A2 expansion board features and provides useful information for

understanding the electrical characteristics.

Figure 2. X-NUCLEO-53L3A2 expansion board schematic diagram

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X-NUCLEO-53L3A2 expansion board

UM2757 - Rev 2 page 5/17

3.1 Description

The board allows the user to test the VL53L3CX functionality, to program it and to understand how to develop an

application using the VL53L3CX. It integrates:

• 2.8 V regulator to supply the VL53L3CX

• Level translators to adapt the I/O level to the main board of the microcontroller

• Arduino UNO R3 connectors

• Optional VL53L3CX breakout board connectors

• Solder drops to allow different configurations of the expansion board

It is fundamental to program a microcontroller to control the VL53L3CX through the I2C bus. The application

software and an example of the C-ANSI source code are available on www.st.com/VL53L3CX.

The X-NUCLEO-53L3A2 expansion board and STM32 Nucleo development board are connected through the

Arduino UNO R3 connectors CN5, CN6, CN8, and CN9 as shown in Figure 3. X-NUCLEO-53L3A2 expansion

board connector layout and as described in Table 3. Left Arduino connector and Table 4. Right Arduino connector.

The X-NUCLEO-53L3A2 must be plugged onto the STM32 Nucleo development board through the Arduino UNO

R3 connectors.

Figure 3. X-NUCLEO-53L3A2 expansion board connector layout

CN6

IOREF

+3.3V

GND

VINP (3V3)

GND

RESET

+5V

VIN

CN9

CN5

D10

D11

D12

D13

GND

AVDD

D14

D15

SCL

SDA

INT_L

GPIO1_L INT_L*

INT_R*

GPIO1_R INT_R

CN8

INT U14 GPIO1

INT* U17

Fit

U15

U18

U11

NC U10

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Description

UM2757 - Rev 2 page 6/17

Table 3. Left Arduino connector

CN number VL53L3CX

board Pin number Pin name MCU pin X-NUCLEO-53L3A2 expansion

board function

CN6 power

1 NC NC

2 NC IOREF

Not used

3 NC RESET

Power 4 3V3 3V3 3.3 V supply

5 NC 5V Not used

Gnd 6 Gnd Gnd

Gnd

Gnd 7 Gnd Gnd

8 NC VIN

Not used

CN8 analog

1 NC PAO

2 NC PA1

GPIO1 3 INT PA4 Interrupt signal from VL53L3CX on

board soldered device

4 NC PB0 Not used

GPIO1 5 INT PC1 (1)

By default not used, interrupt

signal from VL53L3CX on board

soldered device

6 NC PC0 Not used

1. Depends on STM32 Nucleo board solder bridges, see details in Section 3.3: Solder drop configurations. These interrupt

signals are duplicated, but not used. This offers hardware connection flexibility in case of conflict on the MCU interface

management when the expansion board is used superimposed with other expansion boards. In this case, remove the solder

drop from the used interrupt and instead, fit the solder drop in “NC”.

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Description

UM2757 - Rev 2 page 7/17

Table 4. Right Arduino connector

CN number VL53L3CX

board Pin number Pin name MCU pin X-NUCLEO-53L3A2 expansion

board function

CN5 digital

SCL 10 D15 PB8 I2C1_SCL

SDA 9 D14 PB9 I2C1_SDA

8 NC AVDD Not used

Gnd 7 Gnd Gnd Gnd

6 INT_L PA5

Not used

5 NC PA6

4 NC PA7

3 NC PB6

GPIO1_L 2 INT_L PC7 By default not used, interrupt

signal from optional VL53L3CX left

breakout board (1)

GPIO1_L 1 INT_L PA9

CN9 digital

8 NC PA8

Not used

7 NC PB10

6 NC PB4

5 INT_R PB5

By default not used, interrupt

signal from optional VL53L3CX

right breakout board (1)

4 NC PB3 Not used

3 INT_R PA10

By default not used, interrupt

signal from optional VL53L3CX

right breakout board (1)

2 NC PA2

Not used

1 NC PA3

1. These interrupt signals are duplicated, but not used by default. This offers hardware connection of the breakout board

VL53L3CX interrupt signals and flexibility in case of conflict on the MCU interface management when the expansion board

is used superimposed with other expansion boards. In this case, select, through a solder drop, the MCU port which is free.

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Description

UM2757 - Rev 2 page 8/17

3.2 Electrical schematic

Figure 4. X-NUCLEO-53L3A2 expansion board schematic

VL53L3

VL53L1

VL53L3CX application

VL53L3CX

* Can be NC or grounded

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Electrical schematic

UM2757 - Rev 2 page 9/17

3.3 List of materials

Table 5. List of materials

Components Value Reference Supplier Comments

VL53L3CX application

C1, C3 100 nF X5R

Supply voltage decoupling

C2 4.7 µF X5R - 6.3 V

R1 47 k Interrupt output pull up

R2 47 k Reset input pull up

R66, R67 4.7 k SDA and SCL line pull up at 2.8 V

S1 VL53L3CX ST ToF ranging sensor

VL53L3CX breakout board interfaces

R20 47 k Left breakout board interrupt output

pull up

R21 47 k Left breakout board reset input pull

R22 47 k Right breakout board reset input pull

R23 47 k Right breakout board interrupt

output pull up

2.8 V regulator application

C8 10 µF X5R - 6.3 V Output voltage decoupling

C9 10 µF X5R - 6.3 V Input voltage decoupling

R35 49.9 k Feedback resistor bridge to set the

output voltage to 2.8 V

R43 20 k

U20 LD39050PUR ST Output programmable regulator

Level translator application

C4, C6, C11 100 nF 2.8 V decoupling capacitor

C5, C7, C13 100 nF

3.3 V decoupling capacitor

C12 1 µF X5R - 6.3V

R68, R69 4.7 k SDA and SCL line pull up at 3.3 V

U3, U9 TXS0108PWR TI For all signals except I2C interface

U24 ST2329AQTR ST For I2C interface

Add-on feature

C10 100 nF Supply decoupling capacitor

R45 4.7 k Push button pull up

R46 1 k Output pull up

R60 Delay time setting (def = 10 ms)

PB1 Push button

U22 TPS3838K33 TI Supervisory circuit

GPIO expander

C14, C15 100 nF Supply decoupling capacitor

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List of materials

UM2757 - Rev 2 page 10/17

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