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TSL26721 データシート(PDF) 17 Page - OSRAM GmbH

部品番号 TSL26721
部品情報  Digital Proximity Detector
PDF  47 Pages
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メーカー  OSRAM [OSRAM GmbH]
ホームページ  http://www.osram.com
Logo OSRAM - OSRAM GmbH

TSL26721 データシート(HTML) 17 Page - OSRAM GmbH

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[v1-01] 2019-Nov-20
Proximity Detection
Proximity detection is accomplished by measuring the amount
of light energy, generally from an IR LED, reflected off an object
to determine its distance. The proximity light source, which is
external to the TSL2672 device, is driven by the integrated
proximity LED current driver as shown in Figure 20.
Figure 20:
Proximity Detection
The LED current driver, output on the LDR terminal, provides a
regulated current sink that eliminates the need for an external
current limiting resistor. The combination of proximity LED
drive strength (PDRIVE) and proximity drive level (PDL)
determine the drive current. PDRIVE sets the drive current to
120 mA, 60 mA, 30 mA, or 15 mA when PDL is not asserted.
However, when PDL is asserted, the drive current is reduced by
a factor of about 8 at VLDR = 1.6 V. To drive an external light
source with more than 120 mA or to minimize ON-chip ground
bounce, LDR can be used to drive an external p-type transistor,
which in turn drives the light source.
Referring to the Detailed State Machine figure, the LED current
driver pulses the external IR LED as shown in Figure 21 during
the Prox Accum state. Figure 21 also illustrates that the LED ON
pulse has a fixed width of 7.3
μs and period of 16.0 μs. So, in
addition to setting the proximity drive current, 1 to 255
proximity pulses (PPULSE) can be programmed. When deciding
CH1
Prox
Integration
Prox Control
Prox
ADC
Prox LED
Current Driver
CH0
PDATAH(r0x019)
PDRIVE(r0x0F, b7:6)
Prox
Data
External IR
LED
PTIME(r0x02)
PVALID(r0x13, b1)
VDD
PDL(r0x0D,b0)
PPULSE(r0x0E)
PGAIN(r0x0F, b3:2)
POFFSET(r0x1E)
PSAT(r0x13, b6)
PDIODE(r0x0F, b5:4)
Background Energy
PDATAL(r0x018)
LDR
Object



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