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TMD2671
DIGITAL PROXIMITY DETECTOR
TAOS144B ? SEPTEMBER 2012
Proximity Detection
Proximity detection is accomplished by measuring the amount of IR energy, from the internal IR LED, reflected
off an object to determine its distance. The internal proximity IR LED is driven by the integrated proximity LED
current driver as shown in Figure 6.
LEDA
IR
LEDK
LDR
LED
PPULSE(r0x0E)
PDRIVE(r0x0F, b7:6)
Prox LED
Current Driver
Prox Control
PTIME(r0x02)
Object
PDIODE(r0x0F, b5:4)
Prox
Integration
Prox
ADC
Prox
Data
PDATAH(r0x019)
PDATAL(r0x018)
CH1
CH0
Background Energy
Figure 6. Proximity Detection
The LED current driver provides a regulated current sink on the LDR terminal that eliminates the need for an
external current limiting resistor. The PDRIVE register setting sets the sink current to 100%, 50%, 25%, or 12.5%
of the factory trimmed full scale current.
Referring to the Detailed State Machine figure, the LED current driver pulses the IR LED as shown in Figure 7
during the Prox Accum state. Figure 7 also illustrates that the LED On pulse has a fixed width of 7.3 μ s and
period of 16.0 μ s. So, in addition to setting the proximity drive current, 1 to 255 proximity pulses (PPULSE) can
be programmed. When deciding on the number of proximity pulses, keep in mind that the signal increases
proportionally to PPULSE, while noise increases by the square root of PPULSE.
Reflected IR LED +
Background Energy
LED On
Background
Energy
LED Off
7.3 m s
16.0 m s
IR LED Pulses
Figure 7. Proximity LED Current Driver Waveform
Figure 6 illustrates light rays emitting from the internal IR LED, reflecting off an object, and being absorbed by
the CH0 and CH1 photodiodes. The proximity diode selector (PDIODE) determines which of the two
photodiodes is used for a given proximity measurement. Note that neither photodiode is selected when the
device first powers up, so PDIODE must be set for proximity detection to work.
The LUMENOLOGY r Company
r
www.taosinc.com
r
Copyright E 2012, TAOS Inc.
9
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