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VL53L0X 飛行時間 Distance Sensing Instrument 托架，up to 200 釐米 （PI2490）
飛行時間距離感測器載體，帶電壓調節器，最大 200CM
這款小型數位距離感測器可檢測 0.5 釐米至 15 釐米（0.2 英寸至 6 英寸）外的物體。 該感測器具有回應時間短、尺寸小、電流消耗低和最小感應距離短等特點，是非接觸式、近距離物體檢測的不錯選擇，我們緊湊的載板 PCB 使其易於集成到您的專案中。
概述
ST Microelectronics 的 VL53L0X 是一種集成到緊湊型模組中的飛行時間測距系統。 該板是VL53L0X的載體，因此我們建議在使用本產品之前仔細閱讀VL53L0X數據表 （1MB pdf）。
VL53L0 採用意法半導體的 FlightSense 技術，精確測量紅外鐳射發射脈衝到達最近的物體並反射回探測器所需的時間，因此可以將其視為一個微型、獨立的雷射雷達系統。 這種飛行時間 （TOF） 測量使其能夠準確確定到目標的絕對距離，而不會受到物體反射率的很大影響測量。 該感測器可以以 1 mm 的解析度報告最遠 2 m （6.6 ft） 的距離，但其有效範圍和精度（雜訊）在很大程度上取決於環境條件和目標特性（如反射率和尺寸）以及感測器配置。 （感測器的精度規定範圍為最佳 ±3% 到不太理想的條件下超過 ±10%。
測距測量可通過感測器的 I²C （TWI） 介面進行，該介面也用於配置感測器設置，感測器提供兩個附加引腳：關斷輸入和中斷輸出。
VL53L0X 是一款出色的IC，但其小型無引腳 LGA 封裝使普通學生或業餘愛好者難以使用。 它還在 2.8 V 的推薦電壓下工作，這可能會使工作在 3.3 V 或 5 V 下的微控制器難以連接。 我們的分線板解決了這些問題，使感測器的入門更加容易，同時保持整體尺寸盡可能小。
載板包括一個低壓差線性穩壓器，可提供VL53L0X所需的 2.8 V，從而允許感測器由 2.6 V 至 5.5 V 電源供電。 穩壓器輸出位於 VDD 引腳上，可為外部設備提供近 150 mA 的電流。 該分線板還包括一個電路，可將 I²C 時鐘和數據線移至與提供的 VIN 相同的邏輯電壓電平，從而輕鬆將板與 3.3 V 或 5 V 系統連接，該板的 0.1 英寸引腳間距使其易於與標準無焊試驗板和 0.1 英寸穿孔板一起使用。 該板出廠時已裝滿 SMD 元件，包括 VL53L0X，如產品圖片所示。
對於具有環境光感測功能的類似但距離較短的感測器（最長 20 釐米，或解析度降低的 60 釐米），請參閱我們的VL6180X載體。
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VL53L0X典型測距性能的數據表圖（在預設模式下）。
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規格
- 尺寸：0.5 英寸× 0.7 英寸× 0.085 英寸（13 毫米× 18 毫米× 2 毫米）
- 不含接頭引腳的重量：0.5 克（0.02 盎司）
- 工作電壓：2.6 V 至 5.5 V
- 電源電流：10 mA（有源測距期間的典型平均值）
- 因配置、目標和環境而異。 峰值電流可達 40 mA。
- 輸出格式 （I²C）：16 位距離讀數（以毫米為單位）
- 距離測量範圍：最遠 2 m （6.6 ft）; 請參閱右側的圖表，瞭解典型的測距性能。
- 有效範圍取決於配置、目標和環境。
- 數據表沒有規定最小範圍，但根據我們的經驗，有效限度約為 3 釐米。
Included components
A 1×7 strip of 0.1″ header pins and a 1×7 strip of 0.1″ right-angle header pins are included, as shown in the picture below. You can solder the header strip of your choice to the board for use with custom cables or solderless breadboards, or you can solder wires directly to the board itself for more compact installations.
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VL53L0X Time-of-Flight Distance Sensor Carrier with included header pins.
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VL53L0X Time-of-Flight Distance Sensor Carrier in a breadboard.
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The board has two mounting holes spaced 0.5″ apart that work with #2 and M2 screws (not included).
Using the VL53L0X
Important note: This product might ship with a protective liner covering the sensor IC. The liner must be removed for proper sensing performance.
Connections
A minimum of four connections is necessary to use the VL53L0X board: VIN, GND, SCL, and SDA. The VIN pin should be connected to a 2.6 V to 5.5 V source, and GND should be connected to 0 volts. An on-board linear voltage regulator converts VIN to a 2.8 V supply for the VL53L0X IC.
The I²C pins, SCL and SDA, are connected to built-in level-shifters that make them safe to use at voltages over 2.8 V; they should be connected to an I²C bus operating at the same logic level as VIN.
The XSHUT pin is an input and the GPIO1 pin is an open-drain output; both pins are pulled up to 2.8 V by the board. They are not connected to level-shifters on the board and are not 5V-tolerant, but they are usable as-is with many 3.3 V and 5 V microcontrollers: the microcontroller can read the GPIO1 output as long as its logic high threshold is below 2.8 V, and the microcontroller can alternate its own output between low and high-impedance states to drive the XSHUT pin. Alternatively, our 4-channel bidirectional logic level shifter can be used externally with those pins.
Pinout
Schematic diagram
The above schematic shows the additional components the carrier board incorporates to make the VL53L0 easier to use, including the voltage regulator that allows the board to be powered from a 2.6 V to 5.5 V supply and the level-shifter circuit that allows for I²C communication at the same logic voltage level as VIN. This schematic is also available as a downloadable PDF (100k pdf).
I²C communication
The VL53L0X can be configured and its distance readings can be queried through the I²C bus. Level shifters on the I²C clock (SCL) and data (SDA) lines enable I²C communication with microcontrollers operating at the same voltage as VIN (2.6 V to 5.5 V). A detailed explanation of the I²C interface on the VL53L0X can be found in its datasheet (1MB pdf), and more detailed information about I²C in general can be found in NXP’s I²C-bus specification (371k pdf).
The sensor’s 7-bit slave address defaults to 0101001b on power-up. It can be changed to any other value by writing one of the device configuration registers, but the new address only applies until the sensor is reset or powered off.
The I²C interface on the VL53L0X is compliant with the I²C fast mode (400 kHz) standard. In our tests of the board, we were able to communicate with the chip at clock frequencies up to 400 kHz; higher frequencies might work but were not tested.
Sensor configuration and control
In contrast with the information available for many other devices, ST has not publicly released a register map and descriptions or other documentation about configuring and controlling the VL53L0X. Instead, communication with the sensor is intended to be done through ST’s VL53L0X API (STSW-IMG005), a set of C functions that take care of the low-level interfacing. To use the VL53L0X, you can customize the API to run on a host platform of your choice using the information in the API documentation. Alternatively, it is possible to use the API source code as a guide for your own implementation.
Sample Code
We have written a basic Arduino library for the VL53L0X, which can be used as an alternative to ST’s official API for interfacing this sensor with an Arduino or Arduino-compatible controller. The library makes it simple to configure the VL53L0X and read the distance data through I²C. It also includes example sketches that show you how to use the library.
