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54A0059_V1.1_EN / LeddarSteer DBSD Evaluation Board

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User Guide

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Version History

Version

Description

Date (

YYYY

-

MM

-

DD

)

54A0059_V1.0_EN

Initial release

2021-06-11

54A0059_V1.1_EN

Changed range values for following commands: cv, odtc, tcs

2021-07-23

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Summary of Contents for LeddarSteer

Page 1: ...LeddarSteer DBSD Evaluation Board USER GUIDE TF ID 033130...

Page 2: ...2 50 2021 LeddarTech Inc This page intentionally left blank...

Page 3: ...r may be trademarks or registered trademarks used to identify products or services of their respective owners Please contact a LeddarTech sales representative if you have any questions regarding the i...

Page 4: ...ompliance with all legal and regulatory requirements in connection with such selection LeddarTech does not control the installation and use of its products and shall have no liability if a product is...

Page 5: ...Y INFORMATION 17 4 1 DBSD LABEL 17 4 2 LEDDARSTEER EVALUATION BOARD LABEL 17 4 3 REGULATORY COMPLIANCE 17 5 DIGITAL BEAM STEERING DEVICE SPECIFICATIONS 18 5 1 MECHANICAL SPECIFICATIONS 18 5 2 MAIN SPE...

Page 6: ...ER BOARD TO THE COMPUTER UNIVERSAL SERIAL BUS 31 7 4 POWERING THE DRIVER BOARD 32 7 5 FIRMWARE UPDATE 33 8 OPERATING MODES 35 8 1 STAND ALONE MODE 35 8 2 SLAVE MODE 36 8 2 1 Slave Mode 1 HW Trigger 36...

Page 7: ...ectronic interface 26 Fig 15 Connector P3 inserted into the driver board 30 Fig 16 Connector P2 inserted into the driver board 31 Fig 17 USB cable inserted into the driver board 31 Fig 18 Connector P1...

Page 8: ...ting 20 Table 14 LeddarSteer EVB main specifications 23 Table 15 Environmental specifications 26 Table 16 P1 pinout Main power input 27 Table 17 P3 pinout Liquid crystal cell control and temperature a...

Page 9: ...Steer DBSD Evaluation Board User Guide 9 50 Version History Version Description Date YYYY MM DD 54A0059_V1 0_EN Initial release 2021 06 11 54A0059_V1 1_EN Changed range values for following commands c...

Page 10: ...ction Shipping 4535 boulevard Wilfrid Hamel Suite 240 Qu bec Qu bec G1P 2J7 Canada 4535 boulevard Wilfrid Hamel Suite 140 Qu bec Qu bec G1P 2J7 Canada Phone 1 418 653 9000 1 855 865 9900 8 30 a m 5 00...

Page 11: ...xide LC Liquid crystal in general Can be used to identify an LC switch layer PG Or LCPG Polarization grating one DBSD layer used to deflect the light QWP Quarter wave plate Rx Reception related to rec...

Page 12: ...ptical transition time using an external photodetector and a laser module Integrate the LeddarSteer EVB to your own LiDAR architecture Interface with the LeddarSteer EVB through serial terminal softwa...

Page 13: ...rtical The term optical stack is used to refer to the multiple layers that make up the entire DBSD end caps angular deflection elements liquid crystal cells polarization grating quarter wave plates an...

Page 14: ...to clean up potential stray light Table 6 QWP base parameters Parameter Value Number of QWPs 2 Number of controllable QWPs 1 3 4 Voltage Waveform Control At each stage each specific liquid crystal ce...

Page 15: ...High drive Low drive 2 Vpp 40 Vpp Fig 2 Single waveform example 3 5 Transition Time The transition time represents the time to change from a deflection angle to another Fast transition time will occur...

Page 16: ...sistance between two electrodes on opposite sides of a theoretical square The size of the square is unimportant It is dimensionally equal to an ohm but is exclusively used for sheet resistance 3 7 Ove...

Page 17: ...LeddarSteer Evaluation Board Label Table 10 LeddarSteer Evaluation Board identification label Location Description Bottom of LeddarSteer EVB unit MOD EVALBOARD LEDDARSTEER 8 model number SN Serial nu...

Page 18: ...18 50 2021 LeddarTech Inc 5 Digital Beam Steering Device Specifications 5 1 Mechanical Specifications Fig 5 DBSD front and side views Fig 6 DBSD isometric view...

Page 19: ...W x H x D 5 3 High Level Implementation DBSD 20 pin 16 T_I2C HEATER Optical switches 16 Temperature sensor 6 pin Connector Integrated circuit Power Digital Analog Optical element Heating elements Dif...

Page 20: ...LC_2N 8 LC_1N 9 3V3_I2C DBSD temperature sensor supply 3 3 V supply input 10 GND Ground N A 11 EXT_I2C_SCL I2C clock Digital input 3 3 V 12 EXT_I2C_SDA I2C data Digital input output 3 3 V 13 LC_8P Liq...

Page 21: ...Guide 21 50 Pin Signal Description Specifications 3 ITO_2P To ITO heater positive pin Square wave input 30 V 200 Hz 0 to 100 duty cycle 4 GND Ground N A 5 ITO_3P To ITO heater positive pin Square wave...

Page 22: ...22 50 2021 LeddarTech Inc 6 LeddarSteer EVB Specifications 6 1 Mechanical Specifications Fig 9 LeddarSteer EVB front and side views Fig 10 LeddarSteer EVB isometric view...

Page 23: ...ntrol Config tables DAC 12 bit Square generator Step up BOOST HSS 8 16 T_LC_I2C HEATER 12V_VIN SPI VREF NEXT FEEDBACK SEL Amplification Step up BOOST USB Reverse polarity protection filtering Step dow...

Page 24: ...3V3 ITO_1P ITO_2P ITO_3P Translator CAXC4T774 Q1 Translator CAXC4T774 Q1 3V0_VREF 1V2_MON 3V3_MON 24V_MON 30V_MON VREF_MON VBATT_REG_MON 1V2 3V3 24V 30V 3V0_VREF VBATT_REG FPC 16 pin 5019511650 EXT_V...

Page 25: ...0 5 A TPS55340 Q1 24V 3V3_PG 1V2_PG BOOST 0 5 A TPS55340 Q1 30V 30V_EN 1V2_EN Voltage comparator TLV1702 Q1 Volt ref 10 mA REF3430 Q1 3V0_VREF 0 Ohm 0 Ohm 0 Ohm 24V_EN Voltage comparator TLV1702 Q1 VR...

Page 26: ...ue Operating temperature range 40 C to 85 C Relative humidity range 20 to 65 6 6 Interfaces The figure below shows all the interface connectors available on the driver board Main input power P1 USB J1...

Page 27: ...ture acquisition Connector Number of pins Type Mating P3 20 pin Molex 2035642017 Mating Molex 5011892010 Pin Signal Description Specifications 1 LC_8N To liquid crystal negative pin Square wave output...

Page 28: ...6 4 Auxiliary DBSD Heating Input P7 This connector is used as an auxiliary supply input for heaters Hardware modifications must be made to link heaters with this auxiliary supply input This operation...

Page 29: ...10 EXTSPI nCS C SPI interface chip select Digital input 12 NEXT C DBSD next signal Digital input trigger EXT_VIN 14 RESET START C DBSD reset start signal Digital input trigger EXT_VIN 16 FEEDBACK_C D...

Page 30: ...information about this particular software 7 2 Connecting the DBSD to the Driver Board Two connectors are required to interface the LeddarSteer EVB connector P3 for the liquid crystal cells and temper...

Page 31: ...be heard and it is not necessary to depress a latch to release it To disconnect this connector pull it gently upwards Do not apply force to the connector as this could cause damage Fig 16 Connector P...

Page 32: ...pack with the banana plugs and to the board s connector P1 The connector is keyed and will only insert one way This is a latching connector to release it depress the latch on the side of the connector...

Page 33: ...ard power off then on again Fig 19 DIP switch S1 3 in position for firmware update Once the board is rebooted you should be prompted with the following menu Select option 1 You should now see that the...

Page 34: ...that was provided to you select the 1k option if available then proceed with the update If the update is successful you should see a message like the one below You can now set DIP switch S1 3 back to...

Page 35: ...Operating Mode OFF OFF OFF N A Stand alone mode operates by itself ON OFF OFF N A Slave mode 1 HW trigger OFF ON OFF N A Slave mode 2 HW trigger SPI ON ON OFF N A Slave mode 2 HW trigger SPI ON N A Bo...

Page 36: ...XT State_C Transition DBSD ready State_A High Low High Low High Low Fig 21 State and transition Slave mode 1 The configuration commands to send via serial port are Number of cells State table list of...

Page 37: ...ion kit In fact to allow the DBSD to steer light at a given angle with the minimum amount of leakage all of the low voltage liquid crystal cells must be calibrated for every given tile See section 11...

Page 38: ...cific configuration into these text files Consequently it would be easier to revert to a previous setting 10 Interfacing With the LCA3 Evaluation Board It is possible to interface the DBSD driver boar...

Page 39: ...tile A shorter or longer distance can be selected Fig 24 LeddarTech s current optical setup for calibrating the first 7 cells conceptual view Table 24 Optical setup legend first 7 cells Tool Model Use...

Page 40: ...h a l 53 81 43 06 33 97 25 75 18 09 10 73 3 56 3 56 10 73 18 09 25 75 33 97 43 06 53 81 Elevation 9 24 1 2 3 4 5 6 7 8 9 10 11 12 13 14 3 07 15 16 17 18 19 20 21 22 23 24 25 26 27 28 3 07 29 30 31 32...

Page 41: ...0 915 nm 300 mW E Screen Simple black wall F Light source control Thorlabs LDM90 TED200C LDC205C G Power meter Thorlabs PM100D H Horizontal polarizer Thorlabs LPVI050 MP2 I DBSD LeddarSteer J Vertical...

Page 42: ...nation of the spot The voltage of the 8th cell span can vary but typically the low voltage 3 4 should range from 1 V to 5 V while the moderate voltage 4 should be in the range of 5 V to 14 V If calibr...

Page 43: ...ser power the measurement should still be taken more than once to make sure that the laser source is stable Once the laser input power has been taken the power meter can be adjusted to a targeted tile...

Page 44: ...915 0300 915 nm 300 mW F Screen Simple black wall G Light source control Thorlabs LDM90 TED200C LDC205C H Photodiode Thorlabs DET10A Si based detector 200 1100 nm I DBSD LeddarSteer J Vertical polari...

Page 45: ...dered The second type of transition is called a slow transition and occurs when at least one of the first 7 cells needs to be relaxed so it can transition from a high voltage to low voltage This relax...

Page 46: ...to 8 Number of cells Example cn Show number of cells cn 8 Set number of cells to 8 cv cell_id voltage 1 to cell_nbr 0 0 to 23 0 Cell voltage Example cv or cv 0 Show voltage of all cells cv 1 Show volt...

Page 47: ...l overdrive times of state 165 odt 2 700 710 690 Set overdrive times of state 2 to cell 1 700 s cell 2 710 s cell 3 to cell_nbr 690 s LC Cell Voltage Sampling wsp sampling period 1 0 to 10 0 s Wavefor...

Page 48: ...perature control state tc 1 Enable temperature control tcs temp_sp 0 0 to 70 0 Temperature control setpoint C Example tcs Show temperature control setpoint tcs 63 2 Set temperature control setpoint to...

Page 49: ...ation Avoid touching the optical surfaces as fingerprints can permanently damage the optical coatings Cleaning the optical surfaces Blow off dust using compressed air Clean the optical surfaces with p...

Page 50: ...CHINA More information on our offices worldwide can be found at leddartech com contact us Leddar LeddarTech LeddarSteer LeddarEngine LeddarVision LeddarSP LeddarCore VAYADrive VayaVision and related l...

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