onsemi AF0131 User manual

EVAL BOARD USER’S MANUAL
www.onsemi.com
©Semiconductor Components Industries, LLC, 2023
July, 2023 −Rev. 0
1Publication Order Number:
EVBUM2868/D
AF0131 Smart iToF
Evaluation Board User's
Manual
EVBUM2868/D
GENERAL OVERVIEW
This document is a manual for the setup and configuration of the
AF0131 Smart iToF depth sensor demo3 evaluation kit, see Figure 1.
Note that this setup concerns the sensor variant without depth
processing on−chip (AF0131 vs AF0130). This has consequences for
the software setup in DevwareX, operating frame rate as well as the
setup of the laser driver board. See specific sections for more details.
The sensor variants AF0130 & AF0131 are pin compatible.
FUNCTIONAL OVERVIEW
The demokit aims to show the performance and features of the
AF0131 Smart iToF depth sensor. DevwareX is the software used to
interface with the hardware over USB and configure the sensor in
different operating modes.
Two modes are currently available for evaluation:
1. Mode 2.2: 1.2 Mp, 15 fps, Single Frequency 100 MHz (range
0.3−1.5 m)
2. Mode 3.2: VGA, 15 fps, Dual Frequency 100 MHz + 120 MHz
(range 0.3−7.5 m)
As development progresses, more evaluation presets and
documentation will become available. Therefore MyON should be
checked regularly for the latest updates on this product. Please do
inform your onsemi representative in case you like to evaluate a mode
that is not yet available.
Please note that the kit has not (yet) been officially certified as eye
safe. However, several safety features have been implemented to
avoid any damage to the user’s eyes, either by wrong configuration or
unexpected single fault failures. The exposure time of the sensor is
limited by the “Laser eye−safety monitoring” feature on the AF0131
sensor, which monitors the modulation of the lasers by the sensor.
Therefore, the lasers will turn off when the exposure time on the
sensor is set too high. On the VCSEL drivers, the over−current
protection and skin safety protection features are enabled and tested
as well.
ATTENTION: The emitted wavelength of the lasers is not visible to
the human eye! We advise the user to exercise caution
and follow the necessary guidelines to protect your
eyes from potential hazards.
Figure 1. AF0131 Smart iToF Assembled
Evaluation Board

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SYSTEM OVERVIEW
The system contains three sets of hardware and the
necessary assembly screws:
1. A soldered sensor headboard with screw−on lens
AF0130_CSP87_SER_DEMO3_REV0 + 5 V 4 A
power supply
2. A laser driver board
IM1068_LASER_DRIVER_BOARD_REV2 +
12 V 9.2 A power supply
3. The demo3 USB interface board AGB1NOCS
REV7 + tripod stand & USB3 cable
Sensor Headboard
Figure 2 gives a top view of the sensor headboard and
orientation of the sensor.
ATTENTION: Please make sure to connect the 5 V power
supply for the sensor headboard and not
the 12 V.
The included lens set and its adapter consist of:
•Largan Precision Co. 920−960 nm, CRA < 29.8 deg lens
•King Ray Technology 940 nm Band Pass Filter, 3.35 x
3.35 T 0.21 mm
•Lens Mount: Demo to C−mount
•Lens Adapter: C−mount to M18 x 0.35
•Lens Adapter: M18 x 0.35 to M6.9 x 0.25
•4 mm Lens Extension
Figure 2. Top View Sensor Headboard

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Laser Driver Board
The laser board in Figure 3 consists of four sets of Triton
Illuminator VCSELS of 940 nm with their respective drivers
from PhotonIC. The sensor modulates the lasers over LVDS
protocol. However, the drivers are currently still configured
by the demo3 FPGA. At a later stage, the Three−Wire Serial
interface from the sensor will enable the configuration of 2
different laser drivers (SEN1, SEN2 sensor pins). See
related Errata document Issue D.
Figure 3. Top View Laser Driver Board
Demo3 USB Interface Board
For more info on the demo3 USB interface board, please
refer to its user manual: https://www.onsemi.com/design/
tools−software/evaluation−board/agb1n0cs−gevk

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HARDWARE SETUP
Figure 4 illustrates the suggested power off sequence
for the power supplies and USB connection. It is
recommended to remove the 12 V laser supply connection
first or together with the headboard. For the power up
sequence, we recommend to make the USB connection last
and wait several second before starting devware.
Figure 4. Power Off Sequence
DC5V4A Disconnect
DC12V9A Disconnect
End
DevWareX Close
POWER OFF
For AF0130
MG ports
USB Disconnect
For VCSEL
(Laser Board)
DEVWAREX INSTALLATION
The latest version of DevwareX can be downloaded from
the website: https://www.onsemi.com/download/software/
zip/devsuite_sw.zip
The specific sensor setup can be found on the image
sensor portal under NDA: Portal Home > Pre−Production
Products > AF, AP, AR, AS > AF0130
HardwareUpdate Tool
The current software uses a different FPGA version
(0x14D) compared to the latest default for other sensors
(0x4C) working with DevwareX. Your kit should come with
correct version on demo3 for operating the AF0131 sensor
and therefore the demo3 FPGA most probably does NOT
need to be updated. If the demo3 FPGA version does
need to be updated, this version may need to be selected
manually from the C:/Aptina Imaging/fpga folder in
the HardwareUpdate Tool.
DEVWAREX STARTUP WIZARD
Figure 5 will guide you through the startup wizard of
DevwareX. Currently the AF0130−REV1.xsdat file should
be selected manually in the sensor data folder because the
Two−Wire interface is needed for auto−detection of the
sensor after startup. See below limitation on Two−Wire
Serial Interface for more details on this. After this the usual
procedure of running the Demo Initialization should get you
up and running. The AF0131 only has the option to output
RAW interleaved data on the main window. Therefore the
plug−in should be started to show the calculated depth,
intensity and amplitude images.

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5
Figure 5. Procedure of DevwareX Startup Wizard
Devware wake−up
Startup Wizard
Presets
Mode32_100MHz_120
MHz_11bit
Mode22_100MHz_11bit Mode 2.2: ~7.5 m, 1280 x960 px
Mode 2.2: ~7.5 m, 640 x 480 px
Stream out
Open the Plug−in
Depth Enable
DevWareX Open
Headboard
Jumper P3
Popup
“Warning” window
Open
Because Rev1 needs to use SPI, below warning window definitely pops up.
Option for Rev1
Warning
Popup
“Startup Choices”
No
Startup Choices
Select
“AF0130−Rev1.xsdat”
Sensor or Re−Open
Startup Wizard
Four−Wire Serial
Interface (SPI)
Two−Wire Serial
Interface (I2C)
Cancel
Open presets
Manual Select
Select Tab
Plug−in tab
End
Choose one mode.
C:\Aptina Imaging\sensor_data
See Issue 4 & 5
in Errata
LoadInitializationSettings
Select mode 2.2 (Single Frequency)
Select mode 3.2 (Dual Frequency)
→iTof Depth Visualization
Plug−in tab →iTof Depth Visualization

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CALIBRATIONS
Several calibrations are necessary to show the optimal
performance of the sensor. For the AF0131 sensor variant,
these calibrations are applied off−chip, after Devware has
calculated the depth information from the RAW interleaved
phase captures. The final version of AF0130 has these
calibration features planned on−chip.
Global Offset (Phase Bias) Calibration
Figure 6 describes the procedure to set the correct phase
bias values for your system in the AF0130−REV1.ini file.
This is a one−time calibration needed for your system.
Please have a look at the limitations of Four−Wire Serial
Interface (below) when a change of calibration is
experienced.
Figure 6. Procedure of Phase Bias Calibration
Set Mode3.2
Calibration Phase Bias Calibration
Each pixel depth results (back color : green ) are able to be seen if zoom in.
*) This example is white wall.
Frequency 0
Select frequency
Frequency 1
Here is button to open the Depth Processing Parameters
Adjust the
phase_bias_post[0]
Open Depth
Processing Parameters
Depth =1.0m?
Here is the selector which frequency 0 or 1
Here is adjustor for frequency 0. Valid number is 0.0~1.0
Depth =1.0m?
No
Here is adjustor for frequency 1. Valid number is 0.0~1.0
Yes
This calibration makes the depth result adjusted to actual distance.
Add your system
parameters to the INI file
End
Yes
1 m distance between AF0130 and the object
No
Adjust the
phase_bias_post[1]

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Pixel−to−Pixel (Fixed Pattern Noise) Calibration
After enabling the iToF depth plugin in Devware, there’s
an option to enable either phase correction or depth
correction. These are two different means to achieve the
same corrected result. Therefore either one of the two
options should be selected and not both. For phase
correction in mode 3.2, two files should be selected (one for
each phase). This is not the case for the depth correction in
this mode or for mode 2.2 altogether. See also related Issue
2 in the Errata document.
The bin0 suffix in the calibration file name is the native
resolution of this specific mode (1.2 Mp for mode 2.2 and
VGA for mode 3.2). The bin1 suffix refers to the 2x2 binned
file.
Your AF0131 Evaluation Board should include all
relevant pixel−to−pixel calibration files. If not, please
contact your onsemi representative.
Depth Accuracy (High Harmonics) Calibration
Due to the pixel and laser modulation signals not being
perfect sine waves but rather square waves, high harmonics
calibration is needed for high accuracy applications. When
evaluating the sensor’s depth accuracy over distance
without high harmonics corrections, one will see a “wiggle”
of about 3cm distance offset variations.
These High Harmonics calibrations are not yet available
in the current hardware and software.
The final version of the sensor will contain a 64 value
Look−Up Table (LUT) for different modulation frequencies.
Defect Pixel Identification and Replacement
Current defect pixel identification and correction is done
in software. The final version will have this feature on chip.
Lens Calibration
This calibration is needed to create a proper 3D depth map
from the depth data. This calibration will not be supported
on the AF0130 sensor. DevwareX, currently assumes a basic
lens correction algorithm for its point cloud. A simple
pinhole model is assumed with its center in the center of the
image array.
The horizontal field of view can be adjusted ”Lens Angle”
parameter in the depth plug−in.
LIMITATIONS
See the Errata document (AF0130−ERR−D.PDF) for an
overview of all sensor limitations. If by further evaluation of
the sensor you find other features that may be limited. Please
do not hesitate to contact your onsemi representative.
Two−Wire Serial Interface Limited
See related issue 4 and 5 in Errata. This is why Four−Wire
Serial Interface was chosen for the current demo.
Four−Wire Serial Interface Request over USB May
Shift Phase Captures
Due to issue 1, described in the Errata document, the
sensor may shift its phase captures by 90 degrees when
reading a sensor register on the wrong moment. This is
because a register read request from the USB may interrupt
the continuous necessary 90 degree shift updates of the
FPGA to the sensor exposures.
This 90 degree shift in the RAW interleaved exposures
may occur randomly when changing for example exposure
time of the sensor while the sensor is streaming.
Furthermore, this is why it is recommended to disable the
Info Text file (register dump) when grabbing frames with
DevwareX. This can be set in the “Image Save Options”
panel of the “Control Panel” in DevwareX.
Limited Frame Rate
Because the depth processing for AF0131 is done in
software. The current version has a limitation on the frame
rate to allow enough time for processing and corrections in
software.

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ADDITIONAL INFORMATION
TECHNICAL PUBLICATIONS:
Technical Library: www.onsemi.com/design/resources/technical−documentation
onsemi Website: www.onsemi.com
ONLINE SUPPORT: www.onsemi.com/support
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