TCS3771 Datasheet, PDF (13/33 Pages) ams AG – COLOR LIGHT-TO-DIGITAL CONVERTER with PROXIMITY SENSING

TCS3771
COLOR LIGHT-TO-DIGITAL CONVERTER
with PROXIMITY SENSING
TAOS110A − MARCH 2011
Add IR + Subtract
Background Background
LED On
LED Off
14 ms
IR LED Pulses
Figure 11. Proximity IR LED Waveform
lid ^{The proximity integration time (PTIME) is the period of time that the internal ADC converts the analog signal}
to a digital count. It is recommend that this be set to a minimum of PTIME = 0xFF or 2.4 ms.
a ^{The combination of LED power and number of pulses can be used to control the distance at which the sensor}
can detect proximity. Figure 12 shows an example of the distances covered with settings such that each curve
v covers 2× the distance. Counts up to 64 pulses provide a 16× range.
till ₁₀₀₀
AG ^{t s} ₈₀₀
PROXIMITY ADC COUNT
vs.
RELATIVE DISTANCE
25 mA,
1 Pulse
100 mA,
16 Pulses
100 mA,
64 Pulses
s _{en 600}
am nt 400
100 mA,
4 Pulses
o _{100 mA,}
200
1 Pulse
l ^c ₀
Technica ^{1y 2y 4y}
8y
16y
Relative Distance
Figure 12
Copyright E 2011, TAOS Inc.
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The LUMENOLOGY r Company
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