STV-366-R01 View Datasheet(PDF) - STMicroelectronics
Part Name
Description
MFG CO.
'STV-366-R01' PDF : 30 Pages View PDF
VT5366
8
LED selection
LED selection
8.1
Overview
There are a number of LEDs from a range of suppliers which will work well with the VT5366.
It is the responsibility of the customer to ensure that the chosen LED works in their specific
implementation. There are various price/performance trade-offs which may be made if the
customer chooses to do so.
8.2
Key LED parameters
The VT5366 system requires a bright visible RED LED in a standard 5 mm (T1 3/4)
package. The ideal viewing angle is 20o and the intensity should be at least 900mcd at a
forward current of 20mA. The key LED parameters are listed in Table 19.
Table 19. Key LED parameters
Parameter
Recommended value
Diameter
Length
Material
Luminous intensity (@20mA)
Viewing angle
5 mm
8.6 mm
AlInGaP
900 mcd
20 o
Mechanical accuracy
+/- 2 o
Color
Wavelength
Relative Illumination at sensor
plane for a circle of 1.1 mm
diameter
Red
640 nm +/- 50 nm
≥ 80%
Notes
Important for fit with lens
Important for fit with lens
For long-term reliability
Minimum value
Half intensity
Accuracy of the die positioning
within the LED body
Illumination value required for
Red/IR Led and VCSEL
8.3
VCSEL & IR Illumination
The 366 sensor will operate over a wide range of illuminant wavelengths. For devices
operating at approx 850nm (IR LED or VCSEL), the on-die automatic exposure controller
(AEC) will compensate for the change in sensitivity compared to 640nm (red LED).
Navigation performance may be improved by increasing the illuminated device drive.
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