Ambient Light / Proximity Sensor
The Wait Time list box provides a quick mechanism for setting preselected wait periods from 2.4mS to
614mS. The wait period is completely disabled by setting WEN=0 (Enable Register (0x00, bit3).
P
ROXIMITY
S
ENSOR
/
P
ROX
T
HRESHOLD
The control fields to vary the proximity sensor settings are found in this section. Two drop-down
controls allow adjustment of the sink current and number of LED pulses, and selection of which
photodiodes are used to detect the reflected energy. Two slider controls are provided for selection of
proximity release and proximity detection thresholds.
The first list box allows rapid
selection of LED sink current and
the number of LED pulses.
Clicking the down arrow brings up
a list box with several predefined
combinations:
•
Individual settings for the
sink current and/or
number of pulses can also
be made using the device
registers as documented
later in this manual.
•
The photodiodes
receiving the reflected
optical energy are chosen
in the second line. The
list box shows options for Neither, Clear, Red or Both.
•
The “Prox Release Threshold” and “Prox Detect Threshold” sliders allow a threshold (with
hysteresis) to be selected to determine when a proximity detection occurs. The thresholds
can be set to any value from 1 to 1022. The values selected are shown numerically below the
sliders.
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EXAS
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