FEASA LED ANALYSER
ICT VERSION
Frequency Out Port Protocol
This method is based on extracting LED data from the frequency of square wave output
signals. There are three separate outputs and depending on the mode selected the frequency
out represents – one each for Colour, Saturation and Intensity in HSI mode, one each for
Dominant Wavelength, Saturation, Intensity in WSI mode and one each for x chromaticity, y
chromaticity, Intensity in xyI mode. The frequency of the square wave (duty cycle is always
at 50%) signal from the Led Analyser is in the range 1KHz to 100KHz. This is a fast and
simple method of communication and is efficient in terms of tester resources where a
frequency counter is usually available.
The Frequency value for Intensity (pin 15), Colour, Wavelength & x chromaticity (pin 16) and
Saturation, y chromaticity (pin 17) of the LED are output simultaneously at the ICT Port.
Figure 7.
16
Frequency
Generator
Colour
Intensity
Saturation
16
17
15
LED 1
Fiber 1
LED 2
Fiber 2
LED 20
Fiber 20