TSL26717 データシートの表示（PDF） - austriamicrosystems AG

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TSL26717

DIGITAL PROXIMITY DETECTOR

austriamicrosystems AG 

TSL2671

DIGITAL PROXIMITY DETECTOR

TAOS118 − JANUARY 2011

Proximity Detection

Proximity sensing uses an external light source (generally an infrared emitter) to emit light, which is then viewed

by the integrated light detector to measure the amount of reflected light when an object is in the light path

(Figure 6). The amount of light detected from a reflected surface can then be used to determine an object’s

proximity to the sensor.

Surface Reflectivity (SR)

Glass Attenuation (GA)

lid Distance (D)

IR LED

a 2771

ill v Background Energy (BGE)

Optical Crosstalk (OC)

Figure 6. Proximity Detection

t The device has controls for the number of IR pulses (PPCOUNT), the integration time (PTIME), the LED drive

G s current (PDRIVE), and the photodiode configuration (PDIODE) (Figure 7). The photodiode configuration can

be set to CH1 diode (recommended), CH0 diode, or a combination of both diodes. At the end of the integration

A t cycle, the results are latched into the proximity data (PDATAx) registers.

s n IR VDD

amconte LED

PDRIVE(r0x0F, b7:6)

PTIME(r0x02)

IR LED Constant

Current Sink

Prox Control

Prox

Prox

Integration ADC

Prox

Data

PDATAH(r0x19), PDATAL(r0x18)

alCH0

CH1

PPCOUNT(r0x0E)

icFigure 7. Proximity Detection Operation

The LED drive current is controlled by a regulated current sink on the LDR pin. This feature eliminates the need

n to use a current limiting resistor to control LED current. The LED drive current can be configured for 12.5 mA,

25 mA, 50 mA, or 100 mA. For higher LED drive requirements, an external P type transistor can be used to

Tech control the LED current.

Copyright E 2011, TAOS Inc.

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www.taosinc.com

The LUMENOLOGY r Company

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