An Evaluation System for the TSL2560/61 Ambient Light Sensor
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The Relative Power Savings is displayed on the Configuration dialog and is simply the relative power
savings between the
AC and Batteries profiles at which the nit level of the LCD panel is set for each
profile.
The
Advanced
dialog (see Figure 3) displays three key TSL2560 options that directly affect how and
when the display backlight is adjusted when ambient light conditions change. The ALS software
automatically manages the LCD’s brightness using one of the two aforementioned brightness profiles.
A default button is provided to reset the dialog back to the original settings.
The three options that are exposed on the dialog include (1) Backlight Transition Speed, (2) Ambient
Light Threshold, and (3) Duration of Change Outside Threshold:
1.
The
Backlight Transition Speed
specifically addresses the question of “How fast should
the backlight change?” The Backlight Transition Speed determines how fast (or slow) to
increment/decrement the display brightness steps from the current brightness step to the
target brightness step (according to the lux-to-nits response curve). This feature also
provides the capability of simulating the number of backlight steps to closely model the
ODM/OEM’s display brightness implementation. Up to 256 steps are supported.
2.
Ambient Light Threshold
describes the percentage change in ambient light condition to
detect. For example, small changes in ambient light can be filtered out while only
“significant” changes are detected.
Figure 3.
Advanced Dialog
