VT5363(2006) データシートの表示（PDF） - STMicroelectronics
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VT5363 Datasheet PDF : 25 Pages
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VT5363
5
LED selection
LED selection
5.1
Overview
There are a number of LEDs from a range of suppliers which will work well with the VT5363.
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.
5.2
Key LED parameters
The VT5363 system requires a bright visible RED LED in a standard 5mm (T1 3/4) package.
The ideal viewing angle is 20o and the intensity should be at least 900mcd at a forward
current of 20 mA. The key LED parameters are listed in Table 5.
Table 5. Key LED parameters
Parameter
Recommended Value
Diameter
Length
Material
Luminous Intensity (@20mA)
Viewing Angle
Mechanical accuracy
5mm
8.6mm
AlInGaP
900mcd
20o
+/- 2o
Colour
Wavelength
Red
640nm +/- 50nm
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
5.3
VCSEL and IR illumination
The VT5363 sensor will operate over a wide range of illuminant wavelengths. For devices
operating at approx 850 nm (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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