ON Semiconductor SECO-RANGEFINDER-GEVK User Manual

Sipm dtof lidar platform

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SiPM dToF LiDAR Platform
User Guide
SECO-RANGEFINDER-GEVK
Description
The SiPM Direct Time of Flight (dToF) LiDAR Platform is
a complete development kit for single point range−finding
applications. The FDA−certified kit is based on the RB−series
NIR−enhanced SiPM from ON Semiconductor, and integrates all
essential system components including laser and reference circuit
(Tx), receiving circuit (Rx), power management systems, and core
FPGA and UART communication.
The Silicon Photomultiplier (SiPM) is a single−photosensitive, high
performance, solid−state sensor. It is formed of a summed array of
closely−packed Single Photon Avalanche Photodiode (SPAD) sensors
with integrated quench resistors, resulting in a compact sensor that has
high gain (~1x106), high detection efficiency (> 50%) and fast timing
(sub−ns rise times).
Features
Direct ToF Operation for a Single Point
> 0.11 m to 23 m Distance
650−1050 nm BK7 Plano−convex Lenses to Maximize Distance
Measurement
Out−of−the Box Operation with Dedicated GUI
FDA Certified
Single Power Supply
(either from USB = 5 V or PMOD Connector = 3.3 V)
FPGA−based Time−to−Digital Convertor (TDC)
Single Power Supply
(either from USB = 5 V or PMOD Connector = 3.3 V)
Optimized System Cost
Extendable System with the Bluetooth
(BDK−GEVK) and Other Various Sensors and Actuators
Figure 2. Block Diagram
© Semiconductor Components Industries, LLC, 2020
October, 2020 − Rev. 2
®
Development Kit
1
www.onsemi.com
USER MANUAL
Figure 1. SECO−RANGEFINDER−GEVK
Applications
Indoor Navigation and Rangefinding
Collision Detection
3D Mapping
Collateral
(See More Information on Page 54)
SECO−RANGEFINDER−GEVK
MICRORB−10010−MLP
Photodiode (RB Series)
NSVF4015SG4
– RF Transistor
NBA3N012C
– Discriminator
(RF Comparator)
NCP81074A
– High Speed MOSFET Driver
FQT13N06L
– Logic Level MOSFET for
Laser Diode
Publication Order Number:
− SiPM
UM70015/D

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Summary of Contents for ON Semiconductor SECO-RANGEFINDER-GEVK

  • Page 1 The FDA−certified kit is based on the RB−series NIR−enhanced SiPM from ON Semiconductor, and integrates all USER MANUAL essential system components including laser and reference circuit (Tx), receiving circuit (Rx), power management systems, and core FPGA and UART communication.
  • Page 2: Important Safety And Evaluation Board Information

    For repair or service, contact your ON Semiconductor representative for more information. This device should not be modified or operated without its housing or optics. Operating this device without a housing and optics, or operating this device with Laser Notice No.
  • Page 3: Table Of Contents

    Trigger: set number of laser pulses and emit them power budget. The high sensitivity of ON Semiconductor’s on button ‘Trigger’ SiPM allows the use of low power lasers for increased •...
  • Page 4: Specification

    SECO−RANGEFINDER−GEVK SPECIFICATION This development board offers plug and play a single−photosensitive, high performance, solid−state functionality based on the dToF single point measurement sensor. for ranging and sensing applications. It consists of the The foremost advantages that this development board Silicon Photomultiplier (SiPM) that...
  • Page 5: System Overview

    SECO−RANGEFINDER−GEVK • SYSTEM OVERVIEW DCDC converters circuit Figure 3 depicts the operational principle of the dToF • Laser and Reference circuit (Tx) SECO−RANGEFINDER−GEVK. It consists of these main • Receiving circuit (Rx) system blocks: • Supply management circuitry and UART control logic •...
  • Page 6 The bias voltage is common for both to utilize a high−speed MOSFET driver and MOSFET SiPMs and fully controlled by FPGA. Simple dedicated transistor. ON Semiconductor’s high−speed, high−current inverting converter ensures negative bias presence on both NCP81074A fulfills the bandwidth requirements for such diodes.
  • Page 7 SECO−RANGEFINDER−GEVK TDC (Figure 4) and it’s not the pulse coming to the FPGA is possible, but driver−to−driver variation and NCP81074A driver from FPGA’s digital pin. The main temperature dependency would deform the overall reason of this architecture is suppressing the propagation measurement precision.
  • Page 8: Detailed Block Diagram

    • USB – direct connection to computer • PMOD – connector present in ON Semiconductor Bluetooth IoT platform kit (BDK−GEVK) with 3.3 V available directly from BDK−GEVK PMOD interface. Rangefinder’s electronic automatically switches between USB or PMOD supply source, where priority is given to PMOD interface.
  • Page 9 SECO−RANGEFINDER−GEVK • 6. Settable bias voltage for SiPM − RB Formats: Time .tof (ns)/native TDC data .tdc photomultipliers (number of bins) 7. Safety: 9. Loading data: • Overload protection and indication on GUI for • .tof files to the graphical. Comparisons with Laser and SiPM−RB bias voltages real−time data 8.
  • Page 10 SECO−RANGEFINDER−GEVK Figure 11. Select Port − Enabling the GUI Application • by new TDC calibration values with green background if Click on Connect button. Application connects to the successful. Additionally, black semi−circle close to board and gather its current configuration. TDC Disconnect button should rotate slowly.
  • Page 11 SECO−RANGEFINDER−GEVK • Finally, range finding functionality can be tested: 1. Select the SiPM bias power ON ( ) as well as Laser power ON ( ) checkboxes as shown in Figure 13. Actual voltages shown should be within ±0.2 V interval from target voltages.
  • Page 12 SECO−RANGEFINDER−GEVK Advanced Features of Range_Finder_1.0 PC within this range and followed by push of Trigger button, Application equals to number of measurements taken. Distance • Rangefinder’s GUI is capable of visualization Time of between the pulses is in the rhythm of 1024 Hz. Thus Flight data [ns] except default distance measurement [m].
  • Page 13 SECO−RANGEFINDER−GEVK Figure 17. Trigger Pulse Count can be Adjusted between 1−254 Pulses • Rangefinder operates by default in the RUN mode with RUN MODE: Under the Trigger pulse count control box, buffer length of 100. However, user can change number if user moves the slider to the far right end of the scale, of measurement taken.
  • Page 14 SECO−RANGEFINDER−GEVK Figure 18. Rangefinder Set in RUN Mode with Adjustable Buffer Length • count scale is from 1–254. The most critical part of any ToF measurement is storing In auto save mode, auto save checkbox must be the measured data for further processing, characterization checked.
  • Page 15 SECO−RANGEFINDER−GEVK Figure 19. Auto Saving of Measured Data in Trigger Mode In auto save mode, the particular data files are stored default under main folder Range_Finder_1.0, where you unpacked the PC application. Each file is recognized by suffix .tof and can be opened in any text file (Figures 20, 21).
  • Page 16 SECO−RANGEFINDER−GEVK Figure 21. Example of Stored Data after .tof File Opening in Text Editor Figure 22. Loading Already Stored ToF Data from the File Out of the GUI Menu (Part 1/2) www.onsemi.com...
  • Page 17 SECO−RANGEFINDER−GEVK Figure 22. Loading Already Stored ToF Data from the File Out of the GUI Menu (Part 2/2) www.onsemi.com...
  • Page 18 SECO−RANGEFINDER−GEVK 2. TRIGGER MODE – AUTOSAVE start:1 setting generates Custom_Name_ToF_data_ File0001.tof into selected destination. (custom ToF file name and storage destination): This mode offers the same functionality as discussed The last step is to enable auto save checkbox (start: under 1., however user may utilize its own naming and stop: fields are shaded).
  • Page 19 SECO−RANGEFINDER−GEVK Figure 23. AutoSaving of Measured Data in Trigger Mode for Custom ToF File Name and Storage Destination (Part 2/3) www.onsemi.com...
  • Page 20 SECO−RANGEFINDER−GEVK Figure 23. AutoSaving of Measured Data in Trigger Mode for Custom ToF File Name and Storage Destination (Part 3/3) 3. TRIGGER MODE – Manual Save: fixed − under the main GUI folder Range_Finder_ If user wants to utilize its own naming convention 1.0, where you unpacked the PC application).
  • Page 21 SECO−RANGEFINDER−GEVK Figure 24. Custom File Name Creation and ToF Data Storage (Part 2/2) 4. RUN MODE – AUTOSAVE (automated ToF file right end of the scale, where Trigger button alters to generation under fixed storage destination): Run. Hitting the Run button, once auto save In Run mode, GUI automatically saves ToF data into checkbox checked,...
  • Page 22 SECO−RANGEFINDER−GEVK Figure 25. AutoSaving of Measured Data in RUN Mode 5. RUN MODE – AUTOSAVE (custom ToF file name custom named files to set location with suffix given and storage destination): by the start: and stop: fields and data length preset In Run mode, GUI automatically saves ToF data into under Buffer length control box.
  • Page 23 SECO−RANGEFINDER−GEVK • (Figure 27). This arrangement can be useful if user wants One of the perks of the GUI is ability to bring the store to visually asses e.g. the same distance and target at data outlined above and compare it visually with different number (stored vs.
  • Page 24 SECO−RANGEFINDER−GEVK • procedure how to capture and store the TDC bins The GUI is able to save Native TDC data. It represents the corresponding to actual ToF and recalculated distance. It number of bins that correspond to measured distance, can be stored under File " Save native TDC data and multiplied by propagation delay of single bin –...
  • Page 25 SECO−RANGEFINDER−GEVK Figure 28. Saving of the Native TDC Data (Part 2/2) www.onsemi.com...
  • Page 26 SECO−RANGEFINDER−GEVK • calibration (Figure 29). The SW RESET function will The Rangefinder system can be RESET anytime by momentarily cut out the power to the electronic pressing the SW Reset button. After this action, start−up components. of the system occurs with automatic launch of TDC Figure 29.
  • Page 27: Optical Components Description And Characterization

    905 nm band pass filter with MICRORB−10010−MLP Datasheet precisely aligned focal point towards the SiPM Biasing and Readout of ON Semiconductor SiPM Sensors photodetector. It serves as a receiving detector of reflected A Brief Introduction to Silicon Photomultiplier (SiPM) signal from the target.
  • Page 28 SECO−RANGEFINDER−GEVK Figure 32. Receiving Optics Assembly Band Pass Filter Table 3. BAND PASS FILTER SPEC Band pass filter sits on top of SiPM detector and the Manufacturer, Optolong Optics Co.,ltd specification is provided in Table 3 with measured spectral (OPN: BP905/30 nm) response.
  • Page 29 − as soon as MOSFET laser safety standard and holds FDA approval for opens − Laser diode emits for a short period of time. C17 and distribution towards ON Semiconductor customers. C18 discharges into the diode (Figure 36). Standard Compliance Rangefinder board complies with standard IEC/EN 60825−1:2014 and 21 CFR 1040.10 and 1040.11 except for...
  • Page 30 SECO−RANGEFINDER−GEVK DCDC design, sizing the bank capacitors must be done Rangefinder’s DCDC boost is prepared to cope with this carefully and return robust P_LASER disconnect, once situation and OCP is continuously monitored by FPGA. MOSFET driving the laser diode is shorted. Converter must Figure 37 depicts laser power supply current limit.
  • Page 31 SECO−RANGEFINDER−GEVK Figure 40. Typical Laser Optical Pulse Shape Ambient Light Rejection In order to prevent saturation and potential malfunction of Figure 13 in the previous chapter discusses about SiPM reference diode (Tx), FPGA continuously monitors Overload Condition for Reference SiPM at high ambient maximum current out of the inverting DCDC converter illumination (e.g.
  • Page 32 SECO−RANGEFINDER−GEVK Optics Comparison Rx and Tx side of optics is equipped with the same lens type. Lenses from Bohr and RealPoo manufacturers has been measured and either can be used in the Rangefinder (Figure 43). Results are the following: • Similar transmission between Bohr Optics and Realpoo Optics •...
  • Page 33 SECO−RANGEFINDER−GEVK Figure 44. Measurement Error vs. Reference Range (Trigger Pulse Count = 100) Timewalk finder has threshold level set low enough, in order to Timewalk can occur when a high threshold is used with eliminate imprecision caused by low level signal from far a relatively weak return signal.
  • Page 34 SECO−RANGEFINDER−GEVK Figure 46. Actual Measurements of Discriminator Circuit at 5 V and 15 V Laser Bias www.onsemi.com...
  • Page 35: Interfacing With Bluetooth Development Kit

    BDK−GEVK for customers to make the For more information on UART communication protocol compelling use cases. In a such configuration (Figure 47), specification (Rangefinder FPGA host controller), please Rangefinder’s PMOD (male) connected contact ON Semiconductor. Figure 47. Connection of Rangefinder over PMOD (BDK−GEVK) www.onsemi.com...
  • Page 36: Hw Testing Points

    SECO−RANGEFINDER−GEVK HW TESTING POINTS • Rangefinder board is equipped with all necessary test P1V2 – 1.2 V for FPGA points for customers to measure high frequency and power • GND – Ground node management circuitry. Figure 48 shows the summary of test •...
  • Page 37: Hardware Files

    SECO−RANGEFINDER−GEVK HARDWARE FILES All the HW related files (schematic, layout, BOM, mechanical, gerber data) are uploaded on www.onsemi.com webpage as well. Figure 49. Rangefinder Board Circuit Diagrams (Part 1/4) www.onsemi.com...
  • Page 38 Figure 49. Rangefinder Board Circuit Diagrams (Part 2/4) www.onsemi.com...
  • Page 39 Figure 49. Rangefinder Board Circuit Diagrams (Part 3/4) www.onsemi.com...
  • Page 40 Figure 49. Rangefinder Board Circuit Diagrams (Part 4/4) www.onsemi.com...
  • Page 41 Figure 50. Rangefinder Board Assembly and BOM www.onsemi.com...
  • Page 42 Image − TBD Figure 51. Rangefinder PCB Layout and Components Assembly (Part 1/8) www.onsemi.com...
  • Page 43 Figure 51. Rangefinder PCB Layout and Components Assembly (Part 2/8) www.onsemi.com...
  • Page 44 Figure 51. Rangefinder PCB Layout and Components Assembly (Part 3/8) www.onsemi.com...
  • Page 45 Figure 51. Rangefinder PCB Layout and Components Assembly (Part 4/8) www.onsemi.com...
  • Page 46 Figure 51. Rangefinder PCB Layout and Components Assembly (Part 5/8) www.onsemi.com...
  • Page 47 Figure 51. Rangefinder PCB Layout and Components Assembly (Part 6/8) www.onsemi.com...
  • Page 48 Figure 51. Rangefinder PCB Layout and Components Assembly (Part 7/8) www.onsemi.com...
  • Page 49 Figure 51. Rangefinder PCB Layout and Components Assembly (Part 8/8) www.onsemi.com...
  • Page 50 Figure 52. Custom Adapter 20 mm for SiPM Figure 53. Custom Adapter 20 mm for Laser Diode www.onsemi.com...
  • Page 51 Figure 54. Custom Plexi Bottom Plate www.onsemi.com...
  • Page 52 Figure 55. Optical Components Assembly and Mechanical (Part 1/2) www.onsemi.com...
  • Page 53 Figure 55. Optical Components Assembly and Mechanical (Part 2/2) www.onsemi.com...
  • Page 54: Collateral

    FDA Class 3 medical devices or medical devices with a same or similar classification in a foreign jurisdiction or any devices intended for implantation in the human body. Should Buyer purchase or use ON Semiconductor products for any such unintended or unauthorized...

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