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ISL29501-CS-EVKIT1Z Evaluation Kit Manual
1.
Functional Description
The ISL29501-CS-EVKIT1Z is both a reference design and evaluation kit that provides a single platform to
evaluate the features of the ISL29501. The ISL29501-CS-EVKIT1Z circuit board and supplied enclosure deliver
maximum electrical and optical performance.
The system sends out light pulses through the emitter LED and receives returned light pulses that reflect off a
target on the optics board. The difference in phase of the emitted signal and the return signal is converted to
distance by the ISL29501 and is graphed in the evaluation software. The magnitude of the return signal is graphed
as well. This and additional data are available in the chip registers, see UG054, ISL29501 Evaluation Software
Manual for additional details.
1.1
Operating Features
The ISL29501-CS-EVKIT1Z evaluation kit is shown in
controlled by a software switch. A Power-Good (PG) LED indicates that the LDO is regulating properly when not
lit.
1.1.1
External Power Supply
For high current/high duty cycle setups USB power may not be able to power the board.
1.1.2
External Microprocessor
For debugging of customer written software, it might be useful to connect the Cat Shark to a different
microprocessor. All signals are available on the optics board connector J1. See the schematic for details. SCL and
SDA are compatible with 1.8V microprocessors but unfortunately the support pins require 3V signaling.
1.1.3
System Calibration
Before meaningful measurements can be made the calibration registers in the chip need to be loaded. This can be
done in two ways. The first is to load a profile that contains data into the GUI. This can be one of the Renesas
provided profiles or one that was saved previously by the user. See UG054, "SL29501 Evaluation Software
Manual for further details. The second is to calibrate the board directly.
1.1.4
Calibrating Cat Shark
There are three separate standard calibrations that need to be executed to calibrate the system. These are
magnitude, crosstalk, and distance calibrations.
1.1.4.1
Magnitude Calibration
Magnitude calibration is done after the emitter current and duty cycle settings are programmed. It is a dark (no
light) calibration that takes less than 1s to run. Run this calibration from the GUI.
1.1.4.2
Crosstalk Calibration
Crosstalk is defined as a signal that reaches the ISL29501 chip directly without bouncing off the target. This can
be electrical or optical. At close range and large return signal values, crosstalk has a minor impact on distance
measurements. At the far end of the distance range, the crosstalk might exceed the signal, adding error to
measurements.
For this calibration, the user makes a distance measurement with the return signal blocked from reaching the
photodiode. This can be done in two ways. The first is to cover the emitter or photodiode optically preventing any
of the emitted signals from reaching the photodiode. The second is to point the board toward infinity so there is no
return signal. Note: Care must be taken because small amounts of signal is returned by objects up to 4 meters
away. The emitting angle of the light is ±3° so you must ensure that there are no objects within this cone when
doing this calibration.
Because the chip sees none of the emitted signal, anything received is crosstalk. Run this calibration from the GUI
after running Magnitude calibration.
UG081 Rev.1.00
Apr 5, 2022
Figure 2
and
Figure
3. The hardware enable function is
Page 3
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