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LEPTON® Engineering Datasheet

The information contained herein does not contain technology as defined by the EAR, 15 CFR 772, is publicly available,

and therefore, not subject to EAR. NSR (6/14/2018).

Information on this page is subject to change without notice.

Lepton Engineering Datasheet, Document Number: 500-0659-00-09 Rev: 203

•

VoSPI Frame

: A VoSPI frame is defined as a continuous sequence of VoSPI packets consisting of a full

frame's worth of pixel data.

•

VoSPI Stream

: A VoSPI stream is defined as a continuous sequence of VoSPI frames.

As summarized in

Table 10

, the packet length and number of packets per frame vary depending upon two

runtime user selections, telemetry mode and bit resolution.

Telemetry mode:

•

Telemetry disabled (default)

•

Telemetry enabled

Video Format mode:

•

Raw14 (default)

•

RGB888

Table 10 - Packet Length and Number of Video Packets per Frame as a Function of User Settings

Video Format Mode

Telemetry Mode

Telemetry Disabled

Telemetry Enabled

Raw14

Packet length: 164 bytes

Video packets per frame: 60

Packet length: 164 bytes

Video packets per frame: 63

RGB888

Packet length: 244 bytes

Video packets per frame: 60

N/A

4.2.2.1

VoSPI Packets

As depicted in

Figure 20

, each packet contains a 4-byte header followed by either a 160-byte or 240-byte

payload. Note: because the payload size differs between video formats, the setting should be selected before
VoSPI synchronization is established. If the setting is changed while VoSPI is active, it is necessary to re-
synchronize (see

VoSPI Stream

, page

Figure 20 - Generic VoSPI Packet

CRC

Payload

Содержание Lepton 1.5

Страница 1: ...80x60 and 160x120 active pixels available Thermal sensitivity 50 mK Integrated digital thermal image processing functions including automatic thermal environment compensation noise filters non uniform...

Страница 2: ...L DESCRIPTION 12 2 1 FPA INTERFACE MODULE 12 2 2 SYSTEM CONTROL SYS CTRL MODULE 12 2 3 POWER MANAGEMENT MODULE 13 2 4 SOFTWARE BASED VIDEO PROCESSING SVP CORE MODULE 13 2 5 MEMORY SYSTEM MEMORY SYS MO...

Страница 3: ...40 4 1 COMMAND AND CONTROL INTERFACE 40 4 1 1 User Defaults Feature 42 4 2 VOSPI CHANNEL 44 4 2 1 VoSPI Physical Interface 45 4 2 2 VoSPI Protocol Lepton 1 5 1 6 2 0 and 2 5 46 4 2 3 VoSPI Protocol Le...

Страница 4: ...mera Temperature in Radiometry enabled Mode 31 Figure 11 Hypothetical Illustration of Camera Output vs Camera Temperature in Radiometry disabled Mode 32 Figure 12 Illustration of a Histogram for a 3x3...

Страница 5: ...r for Successive Frames 60 Figure 38 Valid Frame Timing no loss of synchronization 61 Figure 39 Clock Too Slow Failure to Read an Entire Frame Within the Frame Period 61 Figure 40 Intraframe Delay Too...

Страница 6: ...1 04 06 2018 Corrected part number for Lepton 1 5 Minor editorial changes Added document number 202 07 02 2018 Updated dimensions and weight 203 08 28 2018 Clarified validity of scene dynamic range Up...

Страница 7: ...d by the EAR 15 CFR 772 is publicly available and therefore not subject to EAR NSR 6 14 2018 Information on this page is subject to change without notice Lepton Engineering Datasheet Document Number 5...

Страница 8: ...xed focus lens assembly an 80x60 or 160x120 long wave infrared LWIR microbolometer sensor array and signal processing electronics Some configurations are also provided with an integral shutter assembl...

Страница 9: ...60 50 Yes 8 10 C to 140 C 17 m Lepton 2 5 500 0763 01 80 x 60 50 Yes Yes 8 10 C to 140 C 10 C to 450 C 17 m Lepton 3 0 500 0726 01 160 x 120 57 Yes 13 10 C to 140 C 12 m Lepton 3 5 500 0771 01 160 x 1...

Страница 10: ...in accordance with Electrical Specifications page 73 Input supply voltage nominal 2 8 V 1 2 V 2 5 V to 3 1 V IO Power dissipation Nominally 150 mW at room temperature operating 5 mW standby For 2 0 2...

Страница 11: ...ature coefficient of resistance TCR and low 1 f noise resulting in excellent thermal sensitivity and stable uniformity The microbolometer array is grown monolithically on top of a readout integrated c...

Страница 12: ...epton camera module is shown in Figure 3 Figure 3 Lepton Detailed Block Diagram 2 1 FPA Interface Module The FPA Interface module generates timing and control signals to the FPA It also receives and d...

Страница 13: ...e following functionality Servicing of CCI commands Initialization and configuration of the video pipeline Power management Other housekeeping functions 2 7 Video Interface Module Video IF The Video I...

Страница 14: ...NUC block applies correction terms to ensure that the camera produces a uniform output for each pixel when imaging a uniform thermal scene Factory calibrated terms are applied to compensate for temper...

Страница 15: ...4 2 11 5 Colorize The colorize block takes the contrast enhanced thermal image as input and generates a 24 bit RGB color output See Video Output Format Modes page 36 2 12 Master Clock In Lepton the ma...

Страница 16: ...ons among the Five Power States The power states are listed here Off When no voltage is applied Lepton is in the off state In the off state no camera functions are available Uninitialized In the unini...

Страница 17: ...6 The shutdown sequence shown in Figure 6 is the recommended transition back to the shutdown state It is also possible to transition between shutdown and on states via software commands as further de...

Страница 18: ...riods of time degrade uniformity resulting in imagery which appears grainier Figure 7 b and or blotchy Figure 7 c Columns and other pixel combinations may drift as a group These drift effects may occu...

Страница 19: ...Examples of Good Uniformity Graininess and Blotchiness Lepton provides three different FFC modes External default for shutter less configurations Manual Automatic default for configurations with shutt...

Страница 20: ...nters this state when it is operating in automatic FFC mode The camera enters FFC imminent state at a specified number of frames default of 52 frames at 26Hz or approximately 2 seconds prior to initia...

Страница 21: ...t possible opportunity Lepton automatically prohibits the shutter from operating when it detects the temperature to be outside the range 10 C to 80 C5 For example if the camera is operating at a tempe...

Страница 22: ...500 0659 00 09 Rev 203 22 Figure 9 Relative Spatial Noise after FFC vs Number of Integrated Frames defaults is 8 3 3 Gain States Lepton 2 5 and 3 5 can be configured to operate in a high gain state t...

Страница 23: ...hreshold is imaging a colder scene temperature than the user defined temperature threshold Gain mode ROI region of interest used for the calculations used to determine whether the scene conditions tem...

Страница 24: ...A 0 0 1 Telemetry Revision Format major byte 1 minor rev byte 0 A 1 2 2 Time Counter 32 bit counter in units of msec elapsed since boot up A 3 4 2 Status Bits See Table 3 A 5 12 8 Module serial A 13...

Страница 25: ...sec A 32 32 1 Housing temp at last FFC Updated every FFC Units are Kelvin x100 Lepton 2 5 3 5 A 33 33 1 Reserved A 34 37 4 AGC ROI top left bottom right A 38 38 1 AGC Clip Limit High See AGC page 15 A...

Страница 26: ...0 High 1 Low 2 Auto C 6 6 1 Effective Gain Mode In Auto mode 0 High 1 Low C 7 7 1 Gain Mode Desired Flag 0 current gain mode is desired 1 gain mode switch desired C 8 8 1 Temperature Gain Mode Thresho...

Страница 27: ...e Threshold High to Low Population threshold in percent of the Gain Mode ROI used to determine when an Auto switch to Low gain mode while in High gain mode should occur C 15 15 1 Population Gain Mode...

Страница 28: ...notice Lepton Engineering Datasheet Document Number 500 0659 00 09 Rev 203 28 Telemetry Row Word start Word End Number of16 bit Words Name Notes C 54 54 1 Spotmeter ROI Start Row Spotmeter ROI startin...

Страница 29: ...ired 1 FFC desired 4 5 2 FFC State7 00 FFC never commanded 01 FFC imminent 10 FFC in progress 11 FFC complete 6 11 6 Reserved 12 12 1 AGC State 0 Disabled 1 Enabled 13 14 2 Reserved 15 15 1 Shutter lo...

Страница 30: ...tended as a fully radiometric camera therefore the factory defaults are defined to have both radiometry and TLinear modes enabled With radiometry mode enabled independent of TLinear state the Spotmete...

Страница 31: ...tion as camera temperature changes particularly when the temperature change is rapid Also notice that responsivity is also independent of camera temperature that is the difference in output between tw...

Страница 32: ...try disabled Mode 3 5 4 Radiometric Accuracy Module Lepton camera module radiometric accuracy in high gain mode is 5 C 25 C against a 35 C blackbody for a Lepton camera module using a simple test boar...

Страница 33: ...must be considered Heat from nearby components such as electronic devices motors and solenoids and even heat from an operator s hand may directly or indirectly increase the radiation falling on the se...

Страница 34: ...tor and AGC Calculation Enable State in the Software IDD for additional related options AGC is a process whereby the large dynamic range of the infrared sensor is collapsed to a range more appropriate...

Страница 35: ...en an object and a much colder or hotter background can be rendered poor by the fact the algorithm collapses the separation between such that the object is only 1 gray shade above the background This...

Страница 36: ...he brightness of objects in the scene more representative of their temperature differences The default values of both parameters produce a good compromise between the two however because optimum AGC i...

Страница 37: ...Disable telemetry if required telemetry is not valid in RGB888 mode 2 Enable AGC colorization without AGC is not a valid permutation 3 Select RGB888 mode 4 Synchronize or re synchronize the VoSPI cha...

Страница 38: ...in technology as defined by the EAR 15 CFR 772 is publicly available and therefore not subject to EAR NSR 6 14 2018 Information on this page is subject to change without notice Lepton Engineering Data...

Страница 39: ...0 0659 00 09 Rev 203 39 Figure 15 Comparison of an Identical Image with Grayscale and a False color Palette 3 8 GPIO Modes There are two supported GPIO modes Disabled default VSYNC enabled In disabled...

Страница 40: ...run executing a function Table 6 shows a partial list of parameters features controllable through the CCI Note that the Power On Default field in the table is not always equivalent to the software def...

Страница 41: ..._lo 85 C_lo_to_hi 388 T_hi_to_lo 358 T_lo_to_hi Gain States page 22 B8 26 VID Color LUT Select Fusion Video Output Format Modes page 36 n a VID User Color LUT Upload Download n a Video Output Format M...

Страница 42: ...the CCI above to OTP such that an initialization sequence is not necessary at start up The OEM User Defaults command is described in the Software IDD The list of parameters that are included in the u...

Страница 43: ...e 36 OEM Video Output Format Raw14 Video Output Format Modes page 36 OEM GPIO Mode Disabled GPIO Modes page 39 OEM GPIO VSYNC Phase Delay 0 lines Frame Synchronization page 53 RAD Radiometry Control E...

Страница 44: ...SPI Channel The Lepton VoSPI protocol allows efficient and verifiable transfer of video over a SPI channel The protocol is packet based with no embedded timing signals and no requirement for flow cont...

Страница 45: ...SR 6 14 2018 Information on this page is subject to change without notice Lepton Engineering Datasheet Document Number 500 0659 00 09 Rev 203 45 Figure 16 VoSPI Flexible Clock Rate 4 2 1 VoSPI Physica...

Страница 46: ...gure 18 SPI Mode 3 CPOL 1 CPHA 1 Figure 19 SPI Bit Order transmission of 0x8C08 The maximum clock rate is 20 MHz The minimum clock rate is a function of the number of bits of data per frame that need...

Страница 47: ...e and bit resolution Telemetry mode Telemetry disabled default Telemetry enabled Video Format mode Raw14 default RGB888 Table 10 Packet Length and Number of Video Packets per Frame as a Function of Us...

Страница 48: ...st significant bits of the ID and all sixteen bits of the CRC are set to zero for calculation of the CRC There is no requirement for the host to verify the CRC However if the host does find a CRC mism...

Страница 49: ...ts are set to 0 For RGB888 mode the payload is 240 bytes long Excluding telemetry lines which are invalid in RGB mode each packet consists of pixel data for a single video line 3 bytes per pixel Each...

Страница 50: ...ream A VoSPI stream is simply a continuous sequence of VoSPI frames following a synchronization event Provided that synchronization is maintained a VoSPI stream can continue indefinitely Note that the...

Страница 51: ...able and therefore not subject to EAR NSR 6 14 2018 Information on this page is subject to change without notice Lepton Engineering Datasheet Document Number 500 0659 00 09 Rev 203 51 Figure 25 Frame...

Страница 52: ...now synchronized 4 2 2 3 2 Maintaining Sync There are three main violations that can result in a loss of synchronization Intra packet timeout Once a packet starts it must be completely clocked out wit...

Страница 53: ...ilable Frame 4 2 2 3 3 Frame Synchronization The VoSPI protocol is designed such that embedded timing signals are not required However the Lepton does provide an optional frame timing output pulse tha...

Страница 54: ...packets consisting of one quarter of a frame of pixel data To maintain synchronization it is necessary to read out each VoSPI segment before the next is available VoSPI Stream A VoSPI stream is defin...

Страница 55: ...Payload 4 bytes 160 or 240 bytes depending upon bit resolution setting For video packets the header includes a 2 byte ID and a 2 byte CRC The ID field encodes the segment number 1 2 3 or 4 and the pa...

Страница 56: ...e first bit of the ID field is always a zero The next three bits are referred to as the TTT bits and the following 12 are the packet number Note that packet numbers restart at 0 on each new segment Fo...

Страница 57: ...ved see VoSPI Stream page 50 and in the idle period between frames Lepton transmits discard packets until it has a new frame from its imaging pipeline As shown in Figure 22 the 2 byte ID field for dis...

Страница 58: ...gments Each valid Lepton 3 segment contains data for one quarter of a complete frame With telemetry disabled each segment includes 60 packets comprising 30 video rows When telemetry is enabled each se...

Страница 59: ...ngineering Datasheet Document Number 500 0659 00 09 Rev 203 59 a Telemetry as header b Telemetry as footer 4 2 3 3 VoSPI Stream A VoSPI stream is simply a continuous sequence of VoSPI segments followi...

Страница 60: ...also illustrated in Figure 37 The segment numbers will follow accordingly 1 2 3 4 0 0 0 0 0 0 0 0 1 2 3 4 etc where unique frames are comprised of segment numbers 1 2 3 4 and invalid frames are compr...

Страница 61: ...de asserted or SCLK disrupted in the midst of the packet transfer an intra packet timeout is an unexpected event Failing to read out all packets for a given frame before the next frame is available T...

Страница 62: ...next frame timing pulse is received The pulse is enabled by selecting the VSYNC GPIO mode via the CCI when enabled it is provided on the GPIO3 pin see GPIO Modes page 39 The signal can be configured a...

Страница 63: ...decode the packet number from each packet header For Lepton 3 the host must decode both the packet number and the segment number 2 There is 4X more data to be read per frame on Lepton 3 compared to L...

Страница 64: ...tion to integrating signal current the ROIC also digitizes and multiplexes the signal from each detector into a serial stream And the Lepton ROIC digitizes data from an on chip temperature sensor as w...

Страница 65: ...EAR NSR 6 14 2018 Information on this page is subject to change without notice Lepton Engineering Datasheet Document Number 500 0659 00 09 Rev 203 65 6 Mounting Specifications The Lepton camera mechan...

Страница 66: ...is compatible with two commercially available sockets Molex 105028 1001 and Molex 105028 2031 illustrated in Figure 44 below The former makes electrical contact on the upper surface of a printed circu...

Страница 67: ...technology as defined by the EAR 15 CFR 772 is publicly available and therefore not subject to EAR NSR 6 14 2018 Information on this page is subject to change without notice Lepton Engineering Datashe...

Страница 68: ...gning the foam thickness and compression the tolerances have to be such that the maximum force of 1kgF at the same time as enough force is exerted to keep the Lepton in the socket Figure 46 Recommende...

Страница 69: ...in the Lepton with Radiometry STEP file To avoid mechanical vignetting do not impinge upon the keep out zone defined by this cone 7 Image Characteristics The information given in Table 13 applies acro...

Страница 70: ...and therefore not subject to EAR NSR 6 14 2018 Information on this page is subject to change without notice Lepton Engineering Datasheet Document Number 500 0659 00 09 Rev 203 70 The nominal minimum...

Страница 71: ...e not subject to EAR NSR 6 14 2018 Information on this page is subject to change without notice Lepton Engineering Datasheet Document Number 500 0659 00 09 Rev 203 71 8 Spectral Response For reference...

Страница 72: ...o EAR NSR 6 14 2018 Information on this page is subject to change without notice Lepton Engineering Datasheet Document Number 500 0659 00 09 Rev 203 72 Figure 48 Normalized Response as a Function of S...

Страница 73: ...5 CFR 772 is publicly available and therefore not subject to EAR NSR 6 14 2018 Information on this page is subject to change without notice Lepton Engineering Datasheet Document Number 500 0659 00 09...

Страница 74: ...Description 1 6 8 9 10 15 18 20 25 27 30 GND Power GND CommonGround 2 GPIO3 VSYNC IN OUT VDDIO Video output synchronization see GPIO Modes page 39 3 GPIO2 IN OUT VDDIO Reserved 4 GPIO1 IN OUT VDDIO Re...

Страница 75: ...Signal Level Description 16 VDDIO Power 2 8 V 3 1 V Supply used for System IO 17 VPROG See section 2 8 19 VDD Power 2 8V Supply for Sensor 2 8V 3 21 SCL IN VDDIO Camera Control Interface Clock I2C co...

Страница 76: ...6 Volts VDDCpp VDDC peak to peak ripple voltage 50 mV VDD Sensor Voltage primary power for the Lepton internal sensor chip 2 72 2 80 2 88 Volts VDDpp VDD peak to peak ripple voltage 30 mV VDDIO3 I O V...

Страница 77: ...90 to 10 SPI_CLK Fclk See note 3 20 MHz VoSPI clock rate SPI_CLK Fclk duty 45 50 55 SPI clock duty cycle SPI_CLK tr TBD SPI clock rise time 10 to 90 SPI_CLK tf TBD SPI clock fall time 90 to 10 SCL Fc...

Страница 78: ...the device at these or any other conditions beyond those indicated under the recommended operating conditions listed in Table 19 is not implied Exposure to absolute maximum rated conditions for exten...

Страница 79: ...ain technology as defined by the EAR 15 CFR 772 is publicly available and therefore not subject to EAR NSR 6 14 2018 Information on this page is subject to change without notice Lepton Engineering Dat...

Страница 80: ...Relative Humidity 95 Thermal Shock Air to air across operating temp extremes 10 C to 65 C 65 C to 10 C MechanicalShock 1500 g 0 4 msec Vibration Transportation profile 4 3 grms ESD Human Body Model H...

Страница 81: ...in does not contain technology as defined by the EAR 15 CFR 772 is publicly available and therefore not subject to EAR NSR 6 14 2018 Information on this page is subject to change without notice Lepton...

Страница 82: ...Anti reflection CCI Command and Control Interface CRC Cyclic Redundancy Check DSP Digital Signal Processor EMC ElectromagneticCompatibility FFC Flat Field Correction FOV Field of View FPA Focal Plane...

Страница 83: ...gineering Datasheet Document Number 500 0659 00 09 Rev 203 83 RoHS Reduction of Hazardous Substances ROIC Readout Integrated Circuit SBNUC Scene basedNon uniformity Correction SNR Signal to Noise Rati...

Страница 84: ...rted sold or leased in the United States The FCC regulations are designed to provide reasonable protection against interference to radio communications See 47 C F R 2 803 and 15 1 et seq Industry Cana...

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