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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)
Distance (D)
Background Energy (BGE)
Glass Attenuation (GA)
IR LED
2771
Optical Crosstalk (OC)
Figure 6. Proximity Detection
The device has controls for the number of IR pulses (PPCOUNT), the integration time (PTIME), the LED drive
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
cycle, the results are latched into the proximity data (PDATAx) registers.
IR
LED
V DD
PDRIVE(r0x0F, b7:6)
PTIME(r0x02)
IR LED Constant
Current Sink
Prox Control
Prox
Integration
Prox
ADC
Prox
Data
PDATAH(r0x19), PDATAL(r0x18)
CH0
CH1
PPCOUNT(r0x0E)
Figure 7. Proximity Detection Operation
The LED drive current is controlled by a regulated current sink on the LDR pin. This feature eliminates the need
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
control the LED current.
Copyright E 2011, TAOS Inc.
8
r
www.taosinc.com
r
The LUMENOLOGY r Company
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