Ambient Light / Proximity Sensor
INPUT
SIDE,
“FUNCTIONAL”
TAB
Simple commonly used controls exist for the ALS functionality, the proximity detection functionality,
the wait time between samples, and the proximity threshold level.
ALS
S
ENSOR
•
Gain - The gain control allows the user access to the AGAIN settings in the Control Register
(0x0F). The gain amplifies the ADC signal to increase sensitivity. The gain options include 1x,
4x, 16x and 60x and are selected from the list box when the down arrow is depressed.
•
Time (mS) – This list box has numerous preselected values for the integration time of all
channels (Red, Blue, Green and Clear). If a value other than what is shown in the list box is
desired it must be entered manually using the Register tab (documented later). Manually
entering a value will NOT work in this location. The actual integration time is shown on the
line below.
NOTE: The saturation level of the device is partially dependant on the integration time. Digital
saturation occurs when the ADC output registers overflow. Digital saturation is reached at
65,536, thus the full-scale output of the TCS3771 is 65,535 (16-bits). If the integration time is
set less than 172ms, however, the dynamic range of the device will be limited to the
following:
Integration Time > 172ms
Saturation = 65,535
Integration Time < 172ms
Saturation = ((Integration Time / 2.7) x 1024) – 1
W
AIT
T
IME
When the software initializes, a default wait period of 2.4mS is inserted between the Prox execution
and the ALS execution. This duration can be adjusted in 2.4mS steps from 0 to 614mS. A wait
multiplier (WLONG=1) may also be used to multiply the wait period by 12x. Using these controls the
duration of the wait may be adjusted from none (WEN=0) to 7.37 seconds (WEN=1, WLONG=1,
WTIME=0x00).
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