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PDF TSL2672 Data sheet ( Hoja de datos )
| Número de pieza | TSL2672 | |
| Descripción | DIGITAL PROXIMITY DETECTOR | |
| Fabricantes | TAOS | |
| Logotipo |  |
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Features
D Proximity Detection with an Integrated LED
Driver in a Single Device
D Register Set- and Pin-Compatible with the
TSL2x71 Series
D Proximity Detection
− Reduced Proximity Count Variation
− Programmable Offset Control Register
− Saturation Indicator
− Programmable Analog Gain and
Integration Time
− Current Sink Driver for External IR LED
− 16,000:1 Dynamic Range
D Maskable Proximity Interrupt
− Programmable Upper and Lower
Thresholds with Persistence Filter
D Power Management
− Low Power 2.2 mA Sleep State with User-
Selectable Sleep-After-Interrupt Mode
− 90 mA Wait State with Programmable Wait
Time from 2.7 ms to > 8 seconds
D I2C Fast Mode Compatible Interface
− Data Rates up to 400 kbit/s
− Input Voltage Levels Compatible with VDD
or 1.8-V Bus
D Small 2 mm y 2 mm Dual Flat No-Lead (FN)
Package
TSL2672
DIGITAL PROXIMITY DETECTOR
TAOS133 − MAY 2012
PACKAGE FN
DUAL FLAT NO-LEAD
(TOP VIEW)
VDD 1
SCL 2
GND 3
6 SDA
5 INT
4 LDR
Not Actual Size
Applications
D Mobile Handset Touchscreen Control and
Automatic Speakerphone Enable
D Mechanical Switch Replacement
D Printer Paper Alignment
End Products and Market Segments
D Mobile Handsets, Tablets, Laptops, and
HDTVs
D White Goods
D Toys
D Digital Signage
D Printers
Description
The TSL2672 family of devices provides proximity detection when coupled with an external IR LED. The devices
incorporate a constant-current LED sink driver to pulse the external IR LED and achieve very low average power
consumption using the low-power wait state with programmable wait time between proximity measurements.
In addition, the devices are register-set and pin-compatible with the TSL2671 series and include a number of
new and improved features, such as improved signal-to-noise and measurement accuracy. A proximity offset
register allows compensation for optical system crosstalk between the IR LED and the sensor. To prevent false
measurements, a proximity saturation bit indicates that the internal analog circuitry saturated. Interrupts have
been enhanced with the addition of a sleep-after-interrupt feature that also allows for single-cycle operation.
The LUMENOLOGY r Company
r
Texas Advanced Optoelectronic Solutions Inc.
1001 Klein Road S Suite 300 S Plano, TX 75074 S (972r) 673-0759
www.taosinc.com
Copyright E 2012, TAOS Inc.
1
1 page  
TSL2672
DIGITAL PROXIMITY DETECTOR
TAOS133 − MAY 2012
Proximity Characteristics, VDD = 3 V, TA = 255C, PGAIN = 1y, PEN = 1 (unless otherwise noted)
PARAMETER
IDD Supply current
ADC conversion time step size
LDR pulse on
PTIME = 0xFF
ADC number of integration steps
(Note 1)
TEST CONDITIONS
MIN TYP
3
2.58 2.73
1
MAX
2.9
UNIT
mA
ms
256 steps
ADC counts per step (Note 1) PTIME = 0xFF
0 1023 counts
ADC count value
λp = 850 nm, Ee = 263.4 μW/cm2,
PTIME = 0xFB, PPULSE = 4
CH0 diode
CH1 diode
1500 2000
900 1200
2500
counts
1500
ADC output responsivity
Gain scaling, relative to 1× gain
setting
λp = 850 nm, PTIME = 0xFB, PPULSE = 1
PGAIN = 2×
PGAIN = 4×
PGAIN = 8×
CH0 diode
CH1 diode
1.90
1.14
counts/
μW/cm2
2
4×
8
Noise (Notes 1, 2, 3)
Ee = 0, PTIME = 0xFB, PPULSE = 4
(Note 6)
CH0 diode
CH1 diode
0.5
% FS
0.5
LED pulse count (Note 1)
0 255 pulses
LED pulse period
16.0 μs
LED pulse width — LED on time
7.3 μs
120 mA: PDRIVE = 0 & PDL = 0
87 116
145
60 mA: PDRIVE = 1 & PDL = 0
58
30 mA: PDRIVE = 2 & PDL = 0
29
LED drive current
ISINK sink current @
1.6 V, LDR pin
15 mA: PDRIVE = 3 & PDL = 0
15 mA: PDRIVE = 0 & PDL = 1
14.5
12.9
mA
7.5 mA: PDRIVE = 1 & PDL = 1
6.4
3.8 mA: PDRIVE = 2 & PDL = 1
3.2
1.9 mA: PDRIVE = 3 & PDL = 1
1.6
Maximum operating distance
(Notes 1, 4, 5)
PDRIVE = 0 and PDL = 0 (116 mA), PPULSE = 64
Emitter: λp = 850 nm, 20° half angle, and 60 mW/sr
Object: 16 × 20-inch, 90% reflective Kodak Gray Card
(white surface)
Optics: Open view (no glass, no optical attenuation)
18 inches
NOTES:
1. Parameter is ensured by design or characterization and is not tested.
2. Proximity noise is defined as one standard deviation of 600 samples.
3. Proximity noise typically increases as √PPULSE
4. Greater operating distances are achievable with appropriate optical system design considerations. See available TAOS application
notes for additional information.
5. Maximum operating distance is dependent upon emitter and the reflective properties of the object’s surface.
6. Proximity noise test was done using the following circuit:
VDD
22 W
1 mF
VDD
1
TSL2672
3
GND
4
LDR
15.0 W
The LUMENOLOGY r Company
r
www.taosinc.com
r
Copyright E 2012, TAOS Inc.
5
5 Page 
TSL2672
DIGITAL PROXIMITY DETECTOR
TAOS133 − MAY 2012
Figure 10 illustrates light rays emitting from an external 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.
Referring again to Figure 11, the reflected IR LED and the background energy is integrated during the LED On
time, then during the LED Off time, the integrated background energy is subtracted from the LED On time
energy, leaving the external IR LED energy to accumulate from pulse to pulse. The proximity gain (PGAIN)
determines the integration rate, which can be programmed to 1×, 2×, 4×, or 8× gain. At power up, PGAIN
defaults to 1× gain, which is recommended for most applications. For reference, PGAIN equal to 8× is
comparable to the TSL2771 1× gain setting. During LED On time integration, the proximity saturation bit in the
Status register (0x13) will be set if the integrator saturates. This condition can occur if the proximity gain is set
too high for the lighting conditions, such as in the presence of bright sunlight. Once asserted, PSAT will remain
set until a special function proximity interrupt clear command is received from the host (see command register).
After the programmed number of proximity pulses have been generated, the proximity ADC converts and scales
the proximity measurement to a 16-bit value, then stores the result in two 8-bit proximity data (PDATAx)
registers. ADC scaling is controlled by the proximity ADC conversion time (PTIME) which is programmable from
1 to 256 2.73-ms time units. However, depending on the application, scaling the proximity data will equally scale
any accumulated noise. Therefore, in general, it is recommended to leave PTIME at the default value of one
2.73-ms ADC conversion time (0xFF).
In many practical proximity applications, a number of optical system and environmental conditions can produce
an offset in the proximity measurement result. To counter these effects, a proximity offset (POFFSET) is
provided which allows the proximity data to be shifted positive or negative. Additional information on the use
of the proximity offset feature is provided in available TAOS application notes.
Once the first proximity cycle has completed, the proximity valid (PVALID) bit in the Status register will be set
and remain set until the proximity detection function is disabled (PEN).
For additional information on using the proximity detection function behind glass and for optical system design
guidance, please see available TAOS application notes.
The LUMENOLOGY r Company
r
www.taosinc.com
r
Copyright E 2012, TAOS Inc.
11
11 Page | ||
| Páginas | Total 30 Páginas | |
| PDF Descargar | [ Datasheet TSL2672.PDF ] | |
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