Hardware
www.ti.com
10
SBOU155B – October 2015 – Revised February 2017
Submit Documentation Feedback
Copyright © 2015–2017, Texas Instruments Incorporated
OPT8241 Evaluation Module
4.4
Illumination Board
The illumination board consists of 4 IR lasers mounted with diffusers and the laser driver ckt. The optical
output power of the illumination board is controlled using an I
2
C interface-based digital potentiometer. The
voxel viewer software can be used to configure the digital potentiometer. The modulation control of the
illumination is done by the OPT8241 sensor and the corresponding signals from the sensor board to the
Illumination board via a flex cable.
Table 4
lists the specifications of the illumination boards.
(1)
All values are typical.
Table 4. Illumination Board Specifications
Item
Specification
(1)
Size
60 mm (W) x 48.5 mm (L) x 12.1 mm (H)
Illumination type
4 x Near IR Laser
Average Output Power(^)
1.5 W
Peak optical output power
10 W
Modulation frequency
12-MHz to 80-MHz square wave at 50% duty cycle
Pulse train width
18 µs–28 ms
Wavelength
850 nm
Laser Beam Divergence
80° at 90% power relative to the center
Laser Beam Shape
Circular
Transverse Beam Mode
Diffused
Diffuser Material
EDC-80, RPC photonics
The illumination power can be changed only between 40% to 100% of the total power. Values below 40%
of the maximum power are not supported. Since each board's maximum power is individually tuned to
make sure that the 100% power setting meets the laser safety requirements, the valid steps between 40%
to 100% power can differ across CDKs.
4.5
Power Supply
The image of the power supply recommended for use with the CDK along with all the blade options is
shown in
Figure 10
.
