ST X-NUCLEO-53L1A1 User manual

March 2018 DocID031498 Rev 1 1/17
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UM2359
User manual
Getting started with X-NUCLEO-53L1A1 long distance ranging ToF
sensor expansion board based on VL53L1X for STM32 Nucleo
Introduction
This document provides detailed hardware information on the X-NUCLEO-53L1A1
expansion board. This expansion board is compatible with the STM32 Nucleo family and the
Arduino™ electronic boards. It is designed around the VL53L1X ranging sensor and is
based on the ST patented FlightSense™ technology.
To allow the user to validate the VL53L1X in an environment as close as possible to its final
application, the X-NUCLEO-53L1A1 expansion board is delivered with a holder in which
three different height spacers of 0.25, 0.5, 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 VL53L1X sensor and the cover glass.
The X-NUCLEO-53L1A1 expansion board is delivered with two VL53L1X breakout boards.
Figure 1. X-NUCLEO-53L1A1 expansion board, spacers, cover glass, and breakout
boards
www.st.com

Contents UM2359
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Contents
1 Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
2 Document references . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
3 X-NUCLEO-53L1A1 expansion board . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
3.1 Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
3.2 Electrical schematic and list of materials . . . . . . . . . . . . . . . . . . . . . . . . . . 8
3.2.1 Electrical schematic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
3.2.2 List of materials . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
3.3 Solder drop configurations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
3.4 Integrated device pinning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
4 VL53L1X breakout board . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
5 Safety . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
5.1 Electrostatic precaution . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
5.2 Laser considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
6 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

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UM2359 Overview
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1 Overview
The X-NUCLEO-53L1A1 expansion board features the VL53L1X 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 VL53L1X applications with Bluetooth or Wi-Fi
interfaces.
The X-NUCLEO-53L1A1 expansion board is delivered with:
•Three spacers of 0.25, 0.5, and 1 mm height, used to simulate different air gaps
between the VL53L1X and the cover glass.
•Two cover windows to simulate the integration of the VL53L1X into the customer’s final
product.
•Two VL53L1X breakout boards which can be plugged onto the X-NUCLEO-53L1A1
expansion board or connected through flying wires to the X-NUCLEO-53L1A1
expansion board.
•Two 10-pin connectors to enable the customer to connect the two breakout boards onto
the X-NUCLEO-53L1A1 expansion board.
Note: The VL53L1X 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.
2 Document references
Table 1. Ordering information
Order code Description
X-NUCLEO-53L1A1 STM32 Nucleo expansion board - spacers and glass - two breakout boards
Table 2. Document references
Description DocID
VL53L1X datasheet DS12385
X-NUCLEO-53L1A1 data brief DB3479
P-NUCLEO-53L1A1 data brief DB3477
X-CUBE-53L1A1 data brief DB3523
Getting started with the X-CUBE-53L1A1 Time-of-Flight long distance ranging
sensor software expansion for STM32Cube UM2371

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3 X-NUCLEO-53L1A1 expansion board
This section describes the X-NUCLEO-53L1A1 expansion board features and provides
useful information for understanding the electrical characteristics.
Figure 2. X-NUCLEO-53L1A1 expansion board schematic diagram
3.1 Overview
The board allows the user to test the VL53L1X functionality, to program it and to understand
how to develop an application using the VL53L1X. It integrates:
•2.8 V regulator to supply the VL53L1X
•Level translators to adapt the I/O level to the main board of the microcontroller
•Arduino UNO R3 connectors
•Optional VL53L1X breakout board connectors
•Solder drops to allow different configurations of the expansion board
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It is fundamental to program a microcontroller to control the VL53L1X through the I2C bus.
The pplication software and an examples of the C-ANSI source code are available on
www.st.com/VL53L1X.
The X-NUCLEO-53L1A1 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 and as described in Table 3 and Table 4.
The X-NUCLEO-53L1A1 must be plugged onto the STM32 Nucleo development board
through the Arduino™ UNO R3 connectors.
Figure 3. X-NUCLEO-53L1A1 expansion board connector layout
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Table 3. Left Arduino connector
CN
number
VL53L1X
board
Pin
number
Pin
name
MCU
pin
X-NUCLEO-53L1A1
expansion board function
CN6 power
1NC NC
2NCIOREF
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
8NC VIN
Not used
CN8 analog
1NC PA0
2NC PA1
GPIO1 3 INT PA4
Interrupt signal from
VL53L1X on board soldered
device
4 NC PB0 Not used
GPIO1 5 INT* PC1 (1)
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”.
By default not used, interrupt
signal from VL53L1X on
board soldered device
6 NC PC0 Not used

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Table 4. Right Arduino connector
CN
number
VL53L1X
board
Pin
number
Pin
name
MCU
pin
X-NUCLEO-53L1A1 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
6INT_LPA5
Not used
5NCPA6
4NCPA7
3 NC PB6
GPIO1_L 2 INT_L* PC7
By default not used, interrupt signal
from optional VL53L1X left breakout
board (1)
1. These interrupt signals are duplicated, but not used by default. This offers hardware connection of the
breakout board VL53L1X 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.
GPIO1_L 1 INT_L PA9
By default not used, interrupt signal
from optional VL53L1X left breakout
board (1)
CN9 digital
8NCPA8
Not used7NCPB10
6 NC PB4
GPIO1_R 5 INT_R* PB5
By default not used, interrupt signal
from optional VL53L1X right breakout
board (1)
4 NC PB3 Not used
GPIO1_R 3 INT_R PA10
By default not used, interrupt signal
from optional VL53L1X right breakout
board (1)
2NCPA2
Not used
1NCPA3

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3.2 Electrical schematic and list of materials
3.2.1 Electrical schematic
Figure 4. X-NUCLEO-53L1A1 expansion board schematic
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3.2.2 List of materials
Table 5. List of materials
Components Value Reference Supplier Comments
VL53L1X 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 VL53L1X ST ToF ranging sensor
VL53L1X breakout board interfaces
R20 47 k Left breakout board interrupt
output pull up
R21 47 k Left breakout board reset input
pull up
R22 47 k Right breakout board reset input
pull up
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 0 Delay time setting (def = 10 ms)

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3.3 Solder drop configurations
Solder drops allow the following configurations of the X-NUCLEO-53L1A1 expansion board:
•If the developer wants to make an application with several expansion boards stacked
and there is:
– conflict with the microcontroller port allocation, the GPIO1 can be output on the
CN8/A4 (U17 fitted) of the Arduino connector. The default configuration is that
GPIO1 is output on the CN8/A2 (U14 fitted) of the Arduino connector.
– conflict on the I2C addresses, the addresses of the STMPE1600 can be modified
(the default addresses A2, A1, A0, 000, and 001).
•If the developer wants to connect breakout boards (see Figure 5) to the X-NUCLEO-
53L1A1 expansion board:
– the VL53L1X interrupt of the left breakout board can be output on the CN5/D9
(U10 fitted) or CN5/D8 (U11 fitted) of the Arduino connector. By default, the U10
and U11 are not fitted.
– the VL53L1X interrupt of the right breakout board can be output on the CN9/D4
(U15 fitted) or CN9/D2 (U18 fitted) of the Arduino connector. By default, the U15
and U18 are not fitted.
– the VL53L1X interrupts of the left and right breakout boards, GPIO1_L and
GPIO1_R, can be shared with the VL53L1X interrupt on the main board, GPIO1,
by fitting U7 and U8 solder drops. By default U7 and U8 are not fitted.
PB1 Push button
U22 TPS3838K33 TI Supervisory circuit
GPIO expander
C14, C15 100 nF Supply decoupling capacitor
Table 5. List of materials (continued)
Components Value Reference Supplier Comments