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PDF TCS3772 Data sheet ( Hoja de datos )
| Número de pieza | TCS3772 | |
| Descripción | COLOR LIGHT-TO-DIGITAL CONVERTER | |
| Fabricantes | TAOS | |
| Logotipo |  |
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Features
D RGB and Clear Color Sensing and
Proximity Detection in a Single Device
D Color Light Sensing with IR-Blocking Filter
− Programmable Analog Gain and
Integration Time
− 3,800,000:1 Dynamic Range
− Very High Sensitivity — Ideally Suited for
Operation Behind Dark Glass
D Proximity Detection
− Ambient Light Rejection
− Programmable Integration Time
− Current Sink Driver for External IR LED
D Maskable Light and Proximity Interrupt
− Programmable Upper and Lower
Thresholds with Persistence Filter
D Power Management
− Low Power — 2.5-mA Sleep State
− 65-mA Wait State withProgrammable Wait
State Time from 2.4 ms to > 7 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
TCS3x71 Series
D Small 2 mm y 2.4 mm Dual Flat No-Lead
(FN) Package
TCS3772
COLOR LIGHT-TO-DIGITAL CONVERTER
with PROXIMITY SENSING
TAOS145B − SEPTEMBER 2012
PACKAGE FN
DUAL FLAT NO-LEAD
(TOP VIEW)
VDD 1
SCL 2
GND 3
6 SDA
5 INT
4 LDR
Package Drawing Not to Scale
Applications
D RGB LED Backlight Control
D Ambient Light Color Temperature Sensing
D Cell Phone Touch Screen Disable
D Mechanical Switch Replacement
D Industrial Process Control
D Medical Diagnostics
End Products and Market Segments
D HDTVs, Mobile Handsets, Tablets, and
Portable Media Payers
D Medical and Commercial Instrumentation
D Toys
D Solid State and General Lighting
Description
The TCS3772 device family provides red, green, blue, and clear (RGBC) light sensing and, when coupled with
an external IR LED, proximity detection. These devices detect light intensity under a variety of lighting conditions
and through a variety of attenuation materials, including dark glass. The proximity detection feature allows a
large dynamic range of operation for accurate short distance detection, such as in a cell phone, for detecting
when the user positions the phone close to their ear. An internal state machine provides the ability to put the
device into a low power state in between proximity and RGBC measurements providing very low average power
consumption.
The color sensing feature is useful in applications such as LED RGB backlight control, solid state lighting,
reflected LED color sampler, or fluorescent light color temperature detection. With the addition of an IR blocking
filter, the device is an excellent ambient light sensor, color temperature monitor, and general purpose color
sensor.
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  
TCS3772
COLOR LIGHT-TO-DIGITAL CONVERTER
with PROXIMITY SENSING
TAOS145B − SEPTEMBER 2012
Proximity Characteristics, VDD = 3 V, TA = 255C, 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
2.27 2.4
1
MAX
2.56
UNIT
mA
ms
256 steps
ADC counts per step (Note 1)
ADC count value
PTIME = 0xFF
λp = 850 nm, Ee = 770.1 μW/cm2, PTIME = 0xFB,
PPULSE = 1 (Note 3)
0
1350
1023 counts
1900 counts
ADC output responsivity
λp = 850 nm, PTIME = 0xFF, PPULSE = 1 (Note 3)
0.175 0.211
counts/
0.247 μW/cm2
Noise (Notes 1, 2, 3)
LED pulse count (Note 1)
Ee = 0, PTIME = 0xFF, PPULSE = 8 (Note 6)
2 % FS
0 255 pulses
LED pulse period
14.0 μs
LED pulse width — LED on time
6.3 μs
PDRIVE = 0
80 106
132
LED drive current
ISINK sink current @ 1.6 V,
LDR pin
PDRIVE = 1
PDRIVE = 2
50
mA
25
PDRIVE = 3
12.5
Maximum operating distance
(Notes 1, 4, 5)
PDRIVE = 0 (100 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)
30 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
TCS3772
3
GND
4
LDR
15.0 W
Wait Characteristics, VDD = 3 V, TA = 255C, WEN = 1 (unless otherwise noted)
PARAMETER
TEST CONDITIONS
CHANNEL
MIN TYP
Wait step size
WTIME = 0xFF
2.27 2.4
Wait number of steps (Note 7)
NOTE 7: Parameter ensured by design and is not tested.
1
MAX
2.56
256
UNIT
ms
steps
The LUMENOLOGY r Company
r
www.taosinc.com
r
Copyright E 2012, TAOS Inc.
5
5 Page 
TCS3772
COLOR LIGHT-TO-DIGITAL CONVERTER
with PROXIMITY SENSING
TAOS145B − SEPTEMBER 2012
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 TCS3772
device, is driven by the integrated proximity LED current driver as shown in Figure 6.
Object
VDD
External IR
LED
PPULSE(r0x0E)
PDRIVE(r0x0F, b7:6)
LDR
Prox LED
Current Driver
PTIME(r0x02)
Prox Control
Prox
Prox
Integration ADC
Prox
Data
PVALID(r0x13, b1)
PDATAH(r0x019)
PDATAL(r0x018)
Background Energy
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. PDRIVE sets the drive current to 100 mA, 50 mA, 25 mA. To drive an
external light source with more than 100 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
6.3 μs and period of 14.0 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
6.3 ms
14.0 ms
IR LED Pulses
Figure 12. Proximity LED Current Driver Waveform
Figure 11 illustrates light rays emitting from an external IR LED, reflecting off an object, and being absorbed by
the proximity photodiode.
The LUMENOLOGY r Company
r
www.taosinc.com
r
Copyright E 2012, TAOS Inc.
11
11 Page | ||
| Páginas | Total 30 Páginas | |
| PDF Descargar | [ Datasheet TCS3772.PDF ] | |
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