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TSL2671
DIGITAL PROXIMITY DETECTOR
TAOS118 ? JANUARY 2011
The number of LED pulses can be programmed to any value between 1 and 255 pulses as needed. Increasing
the number of LED pulses at a given current will increase the sensor sensitivity. Sensitivity grows by the square
root of the number of pulses. Each pulse has a 16- μ s period.
Add IR +
Background
LED On
Subtract
Background
LED Off
16 m s
IR LED Pulses
Figure 8. Proximity IR LED Waveform
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 2.72 ms.
The combination of LED power and number of pulses can be used to control the distance at which the sensor
can detect proximity. Figure 9 shows an example of the distances covered with settings such that each curve
covers 2 × the distance. Counts up to 64 pulses provide a 16 × range.
PROXIMITY ADC COUNT
vs.
RELATIVE DISTANCE
1000
25 mA,
1 Pulse
100 mA,
800
600
100 mA,
16 Pulses
64 Pulses
400
200
0
100 mA,
4 Pulses
100 mA,
1 Pulse
1 y 2 y 4 y
The LUMENOLOGY r Company
8 y
r
16 y
Relative Distance
Figure 9
www.taosinc.com
r
Copyright E 2011, TAOS Inc.
9
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