Ambient Light / Proximity Sensor
T
EXAS
A
DVANCED
O
PTOELECTRONIC
S
OLUTIONS
(TAOS)
PROVIDES CUSTOMER SUPPORT IN VARIED TECHNICAL AREAS
.
S
INCE
TAOS
DOES NOT
POSSESS FULL ACCESS TO DATA CONCERNING ALL OF THE USES AND APPLICATIONS OF CUSTOMERS
’
PRODUCTS
,
TAOS
ASSUMES NO RESPONSIBILITY
FOR CUSTOMER PRODUCT DESIGN OR THE USE OR APPLICATION OF CUSTOMERS
’
PRODUCTS OR FOR ANY INFRINGEMENTS OF PATENTS OR RIGHTS OF
OTHERS WHICH MAY RESULT FROM
TAOS’
ASSISTANCE
.
WWW
.
TAOSINC
.
COM
9
OF
14
“ALS” Sub Tab
The ALS tab shows the registers associated with ambient light sensing control. Register values in hex
are shown on the left, preselected values are available in list boxes in the middle, and actual values
are shown on the right.
Note: The column on the right
is the computed value for ATIM
and is always correct.
Sometimes the value shown in
the list box will be one of the
preselected values but it has not
been selected. If this happens
the number will not be the same
as the computed number for
WTIME on the Control Sub-Tab.
The computed value is the one
that is correct. This can be fixed
by selecting a preselected value
from the list box or by cycling
the register value UP/DOWN or
DOWN/UP. This will set the list
box value or clear the value from the list box so the screen is correct.
E
“ALS Interrupt” Sub Tab
This tab contains the settings for controlling the generation of ALS interrupts to a control processor.
The AILT and AIHT values are 16
bit thresholds for the upper and
lower trigger points. Each is set
using two 8-bit registers.
Another control (APERS)
establishes the required
persistence of the interrupt
signal.
Also on this screen is a control
that will automatically generate
the register values to provide
threshold settings 25% higher
and lower than the currently
measured amount of ambient
light.
