Color Light Sensor
“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.
•
ALS Interrupt Low Threshold (0x04, 0x05) – Low light threshold for ALS interrupt.
1.
AILTL (0x04) – The lower 8 bits of the 16 bit low threshold value.
2.
AILTH (0x05) – The upper 8 bits of the 16 bit low threshold value.
•
ALS Interrupt High Threshold (0x06, 0x07) – High light threshold for ALS interrupt.
1.
AIHTL (0x06) – The lower 8 bits of the 16 bit high threshold value.
2.
AIHTH (0x07) – The upper 8 bits of the 16 bit high threshold value.
•
PERS (0x0C) – The APERS field (bits 3:0) allows the number of times the ALS interrupt
threshold (AILT, AIHT) is exceeded before the interrupt is generated to be controlled. Setting
a zero means an interrupt is generated on every ALS reading.
•
The +/-25% button takes the current ambient light reading and automatically computes new
values for the AILT and AIHT registers, each with a 25% wider latitude.
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