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PDF TSL2772 Data sheet ( Hoja de datos )
| Número de pieza | TSL2772 | |
| Descripción | LIGHT-TO-DIGITAL CONVERTER | |
| Fabricantes | TAOS | |
| Logotipo |  |
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Features
D Ambient Light Sensing and Proximity
Detection in a Single Device
D Ambient Light Sensing (ALS)
− Approximates Human Eye Response
− Programmable Analog Gain and
Integration Time
− 8,000,000:1 Dynamic Range
− Operation to 60,000 lux in Sunlight
− Very High Sensitivity — Ideally Suited for
Operation Behind Dark Glass
− Package UV Rejection Filter
D Proximity Detection
− Programmable Analog Gain, Integration
Time, and Offset
− Current Sink Driver for External IR LED
− Saturation Indicator
− 16,000:1 Dynamic Range
D Maskable ALS and 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 Register Set- and Pin-Compatible with the
TSL2x71 Series
D Small 2 mm y 2 mm Dual Flat No-Lead (FN)
Package
TSL2772
LIGHT-TO-DIGITAL CONVERTER
with PROXIMITY SENSING
TAOS131 − DECEMBER 2011
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 Display Backlight Control
D Cell Phone Touch Screen Disable
D Mechanical Switch Replacement
D Industrial Process Control
D Medical Diagnostics
D Printer Paper Alignment
End Products and Market Segments
D Mobile Handsets, Tablets, Laptops, HDTVs,
Monitors, and PMP (Portable Media
Players)
D Medical and Industrial Instrumentation
D White Goods
D Toys
D Industrial/Commercial Lighting
D Digital Signage
D Printers
Description
The TSL2772 device family provides both ambient light sensing (ALS) and, when coupled with an external IR
LED, proximity detection. The device family is based on the TAOS patented dual-diode technology that enables
accurate ALS results and approximates human eye response to light intensity under a variety of lighting
conditions.
The TSL2772 ALS includes a reduced-gain mode that extends the operating range to 60k lux in sunlight. The
device package incorporates a UV-rejection filter that enables accurate ALS. The TSL2772 proximity detection
includes improved signal-to-noise performance and selectable gain modes. A proximity offset register allows
compensation for optical system crosstalk between the IR LED and the sensor. To prevent false proximity data
measurement readings, a proximity saturation indicator bit signals that the internal analog circuitry has reached
saturation.
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 2011, TAOS Inc.
1
1 page  
TSL2772
LIGHT-TO-DIGITAL CONVERTER
with PROXIMITY SENSING
TAOS131 − DECEMBER 2011
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
TSL2772
3
GND
4
LDR
15.0 W
The LUMENOLOGY r Company
r
www.taosinc.com
r
Copyright E 2011, TAOS Inc.
5
5 Page 
TSL2772
LIGHT-TO-DIGITAL CONVERTER
with PROXIMITY SENSING
TAOS131 − DECEMBER 2011
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 TSL2772
device, is driven by the integrated proximity LED current driver as shown in Figure 11.
Object
VDD
External IR
LED
PDL(r0x0D,b0)
PPULSE(r0x0E)
PDRIVE(r0x0F, b7:6)
LDR
Prox LED
Current Driver
PGAIN(r0x0F, b3:2)
POFFSET(r0x1E)
PTIME(r0x02)
PDIODE(r0x0F, b5:4)
Prox Control
Prox
Prox
Integration ADC
Prox
Data
PVALID(r0x13, b1)
PSAT(r0x13, b6)
PDATAH(r0x019)
PDATAL(r0x018)
CH1
Background Energy
CH0
Figure 11. 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 12 during the Prox Accum state. Figure 12 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 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
Background Energy Energy
LED On
LED Off
7.3 ms
16.0 ms
IR LED Pulses
Figure 12. Proximity LED Current Driver Waveform
The LUMENOLOGY r Company
r
www.taosinc.com
r
Copyright E 2011, TAOS Inc.
11
11 Page | ||
| Páginas | Total 30 Páginas | |
| PDF Descargar | [ Datasheet TSL2772.PDF ] | |
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