Cirrus-logic AN374 Manual de usuario descargar pdf (Pagina 32)

AN374

32 AN374REV2

Step 2) Red Gain setting

The entry procedure that is required to preform a curve fit for the Color Gain polynomial is detailed in Figure 28.

1. Enter the color LED currents (in Amperes) for different dims. Repeat for different ambient temperatures.

Right click to see options to load data from CSV file.

2. Select “Use Mask” to mask the interpolated NTC code regions not present in the NTC data in the surface

to be fit. Set Mask Low Level to a value relative to 1 to use as weights for the interpolated NTC code

regions on the surface.

3. Enter Weight Factor. Values > 1 favor high dim levels in the fit and values < 1 favors low dim levels.

4. Click the Calculate Coefficients button.

5. Adjust Results. Polynomial coefficients can be modified over and above the fit results.

6. Click the UPDATE REGISTERS button to update the Color System tab under REGISTERS with Q3, Q2,

Q1, and Q0. Values are not written to the chip; only the tab is populated.

Step 1:

Enter the color LED

currents for different dims.

Select graph to view to

check quality of fit.

Select 3D view

perspective.

Click Expand to display

the graph in a larger

window

Step 2:

Select “Use Mask”.

Step 3:

Enter the Weight Factor.

Step 5:

Adjust Results.

Step 6:

Click the UPDATE

REGISTERS button.

Step 4:

Click the Calculate

Coefficients button.

Figure 28. SYSTEM DESIGN - Color Gain Tab

1 2 ... 27 28 29 30 31 32 33 34 35

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Cirrus-logic AN374 Manual de usuario Pagina 32