ST VL6180 User manual

Introduction
This user manual provides detailed hardware information on the X-NUCLEO-6180A1 expansion board (see figure below). This
board is designed around the VL6180 proximity sensor and it is compatible with the STM32 Nucleo and Arduino Uno boards.
The document provides an introduction to the proximity sensing capabilities of the VL6180 module which is based on ST's
patented Time-of-Flight (ToF) technology. Several ST expansion boards can be superposed through the Arduino connectors,
which allow development of VL6180 applications with Bluetooth or WiFi interfaces.
Figure 1. X-NUCLEO-6180A1 expansion board
Table 1. Ordering information
Order code Description
X-NUCLEO-6180A1 X-NUCLEO-6180A1 expansion board for use with STM32 Nucleo board
References
• VL6180 datasheet: Time-of-Flight proximity sensor and IR emitter two-in-one module
• X-NUCLEO-6180A1 data brief: Proximity Time-of-Flight sensor expansion board based on VL6180 for STM32 Nucleo
How to use the VL6180 proximity sensor X-NUCLEO-6180A1 expansion board
with the STM32 Nucleo board
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User manual
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For further information contact your local STMicroelectronics sales office.
www.st.com

1Hardware description
This section describes the X-NUCLEO-6180A1 expansion board features and provides information on the
electrical schematics.
Figure 2. X-NUCLEO-6180A1 expansion board block diagram
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1.1 Board description
The X-NUCLEO-6180A1 expansion board allows the user to test the VL6180 functionality and program it. Also,
advice is given on how to develop an application using the VL6180. The X-NUCLEO-6180A1 expansion board
integrates:
• a 4-digit display to render the range value in mm
• a 2.8 V regulator to supply the VL6180
• two level shifters to adapt the I/O level to the microcontroller main board
• the necessary connectivity for the application
It is fundamental to program a microcontroller to control the VL6180 through the I2C bus and drive the 4-digit
display on-board. Application software and examples of C-ANSI source code are available on www.st.com/
VL6180.
The X-NUCLEO-6180A1 expansion board and STM32 Nucleo are connected through Arduino compatible
connectors CN5, CN6, CN8 and CN9 as shown and described in the figure and tables below.
The Arduino connectors on the STM32 Nucleo board support Arduino Uno revision 3.
Figure 3. Arduino connector layout
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Table 2. Arduino left connector on STM32 Nucleo board
CN number X-NUCLEO-6180A1
expansion board Pin number Pin name MCU pin X-NUCLEO-6180A1 expansion board function
CN6 power
1 NC
VIO 2 VIO Level shifter reference (3.3 V)
3 NC
Power 4 3V3 3.3 V supply
5 NC
Gnd 6 Gnd Gnd Gnd
Gnd 7 Gnd Gnd Gnd
8 NC —
CN8 analog
1 NC
2 NC
GPIO1_B 3 INT_B PA4 Interrupt signal from X-NUCLEO-6180A1
bottom breakout plug-in
GPIO1 4 INT PB0 Interrupt signal from X-NUCLEO-6180A1 on-
board soldered device
GPIO1_B 5 INT_B* PC1 or PB9
(1)
Interrupt signal from X-NUCLEO-6180A1
bottom breakout plug-in
GPIO1 6 INT* PC1 or PB8
(1)
Interrupt signal from X-NUCLEO-6180A1 on-
board soldered device
1. Depends on Nucleo board solder bridges (see details on Nucleo board documentation). These interrupt signals are
duplicated, but not used which offers the hardware connection flexibility in case of a conflict on the MCU interface when the
expansion board is used superposed with other expansion boards. In such cases, remove the 0-ohm resistor from the
current interrupt and connect it in place of the “do not mount” resistor.
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Table 3. Arduino right connector on STM32 Nucleo board
CN number X-NUCLEO-6180A1
expansion board Pin number Pin name MCU pin X-NUCLEO-6180A1 expansion board function
CN5 digital
SCL 10 D15 PB8 I2C1_SCL
SDA 9 D14 PB9 I2C1_SDA
8 NC
Gnd 7 Gnd Gnd Gnd
GPIO1_L 6 INT_L PA5 Interrupt signal from X-NUCLEO-6180A1 left
breakout plug-in
5 NC
4 NC
3 NC
2 NC
GPIO1_L 1 INT_L* PA9 Interrupt signal from X-NUCLEO-6180A1 left
breakout plug-in (1)
CN9 digital
8 NC
7 NC
6 NC
GPIO1_R 5 INT_R* PB5 Interrupt signal from X-NUCLEO-6180A1 right
breakout plug-in (1)
4 NC
GPIO1_R 3 INT_R PA10 Interrupt signal from X-NUCLEO-6180A1 right
breakout plug-in
2 NC
1 NC
1. These interrupt signals are duplicated, but not used which offers the hardware connection flexibility in case of a conflict on
the MCU interface when the expansion board is used superposed with other expansion boards. In such cases, remove the
0-ohm resistor from the current interrupt and connect it in place of the “do not mount” resistor.
The X-NUCLEO-6180A1 expansion board allows up to three VL6180 breakout boards to be connected to it (see
Figure 4. Connections of VL6180 breakout boards). This allows the development of applications that can control
up to four VL6180 devices.
The I2C bus is shared with the VL6180 on-board I2C bus. The GPIO1 (interrupt) pins and GPIO0 (reset) pins are
separate pins to control each sensor separately.
The GPIO1 signals are output on the Arduino connectors and the GPIO0 signals are controlled through the GPIO
expander device. Refer to Figure 3. Arduino connector layout and Figure 11. X-NUCLEO-6180A1 expansion
board with GPIO expander for detailed connectivity.
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