TSL26711 データシートの表示（PDF） - austriamicrosystems AG

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TSL26711

DIGITAL PROXIMITY DETECTOR

austriamicrosystems AG 

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-μs period.

Add IR + Subtract

Background Background

LED On

LED Off

lid 16 ms

IR LED Pulses

Figure 8. Proximity IR LED Waveform

a The proximity integration time (PTIME) is the period of time that the internal ADC converts the analog signal

v to a digital count. It is recommend that this be set to a minimum of PTIME = 0xFF or 2.72 ms.

ill 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.

AG t st 1000

ms ten 800

PROXIMITY ADC COUNT

vs.

RELATIVE DISTANCE

25 mA,

1 Pulse

100 mA,

16 Pulses

100 mA,

64 Pulses

a n 600

o 400

c 100 mA,

4 Pulses

l100 mA,

200

1 Pulse

ica 0

Techn 1y 2y 4y

8y

16y

Relative Distance

Figure 9

The LUMENOLOGY r Company

r

r

www.taosinc.com

Copyright E 2011, TAOS Inc.

9

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