AS0260CSSC28SUD20 datasheet(30/83 Pages) ONSEMI

30 / 83 page

AS0260 DS Rev. G Pub. 5/15 EN

©Semiconductor Components Industries, LLC, 2015.

AS0260: 1/6-Inch 1080P High-Definition (HD) System-On-A-Chip (SOC) Digi-

tal Image Sensor

Figure 23:

Gamma Reference Variables Against Brightness Metric

ON Semiconductor recommends that cam_ll_start_contrast_bm is set at 100lux and

cam_ll_stop_contrast_bm is set at 20lux, but the actual setting is at the discretion of the

user.

The recommended setting for cam_ll_llmode is 0x03. This allows the AS0260 to calculate

both of the 19 knee point curves based on the user inputs, otherwise the user will have to

program the 19 knee point curves.

Gamma Curve Selection

The AS0260 allows the user to select between the two-curve interpolation mode or fixed

mode using either of the curves

Table 7:

Gamma Curve Selection

Variable

Name

Function

VAR(0x0F,0x0008) or

(R0xBC08)

ll_gamma_select

0x00= Auto curve select. The curves will interpolate based on

settings of cam_ll_start_contrast_bm and

cam_ll_stop_contrast_bm

0x01 = Contrast

curve is only used

0x02 =Noise

reduction curve is only used

Cam_ll_inv_brightness_metric

Bright

Light

Low

Light

Cam_ll_stop_contrast_percentage=25

Cam_ll_start_contrast_luma_percentage=80

Cam_ll_start_contrast_gradient=50

Cam_ll_stop_contrast_gradient=38

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