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PDF TMD2772 Data sheet ( Hoja de datos )
| Número de pieza | TMD2772 | |
| Descripción | DIGITAL ALS and PROXIMITY MODULE | |
| Fabricantes | TAOS | |
| Logotipo |  |
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Features
D Ambient Light Sensing, Proximity
Detection, and IR LED in a Single Module
D Register Set- and Pin-Compatible with the
TMD2771 Series
D Ambient Light Sensing (ALS)
− Approximates Human Eye Response
− Programmable Analog Gain and
Integration Time
− 8,000,000:1 Dynamic Range
− Very High Sensitivity — Ideally Suited for
Operation Behind Dark Glass
D Proximity Detection
− Reduced Proximity Count Variation *
− Programmable Offset *
− Saturation Indicator *
− Current Sink Driver for IR LED
− 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 3.94 mm y 2.36 mm y 1.35 mm Package
* New or improved feature
TMD2772
DIGITAL ALS
and PROXIMITY MODULE
TAOS147E − DECEMBER 2012
PACKAGE
MODULE−8
(TOP VIEW)
VDD 1
SCL 2
8 SDA
7 INT
GND 3
6 LDR
LEDA 4
5 LEDK
Package Drawing is Not to Scale
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 TMD2772 family of devices provides digital ambient light sensing (ALS), a complete proximity detection
system, and digital interface logic in a single 8-pin surface mount module. The devices are register-set and
pin-compatible with the TMD2771 family of devices and include new and improved ALS and proximity detection
features. The ALS enhancements include a reduced-gain mode that extends the operating range in sunlight.
Proximity detection includes improved signal-to-noise performance and more accurate factory calibration. 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 TMD2772 ALS is based on the TAOS patented dual-diode technology that enables accurate results and
approximates human eye response to light intensity under a variety of lighting conditions. The proximity
detection system includes an LED driver and an IR LED, which are factory trimmed to eliminate the need for
end-equipment calibration due to component variations.
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  
TMD2772
DIGITAL ALS
and PROXIMITY MODULE
TAOS147E − DECEMBER 2012
Proximity Characteristics, VDD = VLEDA = 3 V, TA = 255C, PEN = 1 (unless otherwise noted)
PARAMETER
TEST CONDITIONS
MIN TYP MAX UNIT
IDD Supply current
LED On
LED On, PDRIVE = 0
3 mA
100
ILEDA
LEDA current (Note 1)
LED On, PDRIVE = 1
LED On, PDRIVE = 2
50
mA
25
LED On, PDRIVE = 3
12.5
PTIME ADC conversion steps
1 256 steps
PTIME ADC conversion time
PTIME = 0xFF ( = 1 conversion step)
2.58 2.73 2.9 ms
PTIME ADC counts per step
PTIME = 0xFF ( = 1 conversion step)
0 1023 counts
PPULSE LED pulses (Note 5)
0 255 pulses
LED On LED pulse width
PPULSE = 1, PDRIVE = 0
7.3 μs
LED pulse period
PPULSE = 2, PDRIVE = 0
16.0 μs
Proximity response, no target
(offset)
Prox count, 100-mm target
(Note 3)
PPULSE = 8, PDRIVE = 0, PGAIN = 4×, (Note 2)
73 mm × 83 mm, 90% reflective Kodak Gray Card,
PGAIN = 4×, PPULSE = 8, PDRIVE = 0, PTIME = 0xFF
(Note 4)
100 counts
450 520 590 counts
NOTES: 1. Value is factory-adjusted to meet the Prox count specification. Considerable variation (relative to the typical value) is possible after
adjustment.
2. Proximity offset varies with power supply characteristics and noise.
3. ILEDA is factory calibrated to achieve this specification. Offset and crosstalk directly sum with this value and is system dependent.
4. No glass or aperture above the module. Tested value is the average of 5 consecutive readings.
5. These parameters are ensured by design and characterization and are not 100% tested.
6. Proximity test was done using the following circuit. See the Application Information: Hardware section for recommended
application circuit.
VDD
1 mF
VDD 1
3
GND
TMD2772
4 LEDA
5 LEDK
6 LDR
1 mF 22 mF
IR LED Characteristics, VDD = 3 V, TA = 255C
PARAMETER
TEST CONDITIONS
VF Forward Voltage
VR Reverse Voltage
PO Radiant Power
λp Peak Wavelength
Δλ Spectral Radiation Bandwidth
TR Optical Rise Time
TF Optical Fall Time
IF = 20 mA
IR = 10 μA
IF = 20 mA
IF = 20 mA
IF = 20 mA
IF = 100 mA, TW = 125 ns, duty cycle = 25%
IF = 100 mA, TW = 125 ns, duty cycle = 25%
MIN TYP
1.4
5
4.5
850
40
20
20
MAX
1.5
40
40
UNIT
V
V
mW
nm
nm
ns
ns
The LUMENOLOGY r Company
r
www.taosinc.com
r
Copyright E 2012, TAOS Inc.
5
5 Page 
TMD2772
DIGITAL ALS
and PROXIMITY MODULE
TAOS147E − DECEMBER 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 8.
Object
LEDA
LEDK
LDR
IR PDL(r0x0D,b0)
LED PPULSE(r0x0E)
PDRIVE(r0x0F, b7:6)
Prox LED
Current Driver
PGAIN(r0x0F, b3:2)
POFFSET(r0x1E)
PTIME(r0x02)
Prox Control
PVALID(r0x13, b1)
PSAT(r0x13, b6)
PDIODE(r0x0F, b5:4)
Prox
Prox
Integration ADC
Prox
Data
PDATAH(r0x019)
PDATAL(r0x018)
CH1
Background Energy
CH0
Figure 8. 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 116 mA, 58 mA, 29 mA, or
14.5 mA when PDL is not asserted. However, when PDL is asserted, the drive current is reduced by a factor
of 9.
Referring to the Detailed State Machine figure, the LED current driver pulses the IR LED as shown in Figure 9
during the Prox Accum state. Figure 9 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 9. Proximity LED Current Driver Waveform
The LUMENOLOGY r Company
r
www.taosinc.com
r
Copyright E 2012, TAOS Inc.
11
11 Page | ||
| Páginas | Total 30 Páginas | |
| PDF Descargar | [ Datasheet TMD2772.PDF ] | |
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