TAOS TCS3771, Руководство пользователя

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Ambient Light / Proximity Sensor
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• 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.
“Proximity” Sub Tab
The Proximity tab shows editable registers associated with proximity sensing control.
Register values in hex are shown on the left, the middle section contains preset controls for quick
configurations, and the column on the right displays the actual values in use.
Note: Values entered via the registers and list boxes for PDRIVE and PDIODE do not automatically
update the other, so the values displayed may not match. The computed value on the right is always
correct and show the values is currently in use.
• PTIME (0x02) – Sets the
integration time of the
proximity ADC in 2.4mS
increments.
• PPULSE (0x0E) - This
control allows the user
to select the number of
LED pulses for proxim
detection. The pulses
have a frequency of
125kHz and a 50% duty
cycle.
ity
• PDRIVE – sets the sink
current through the IR
LED.
• PDIODE – choses the active photodiode(s) for proximity sensing.