|
|
PDF ISL29043 Data sheet ( Hoja de datos )
| Número de pieza | ISL29043 | |
| Descripción | Low Power Ambient Light and Proximity Sensor | |
| Fabricantes | Intersil Corporation | |
| Logotipo |  |
|
Hay una vista previa y un enlace de descarga de ISL29043 (archivo pdf) en la parte inferior de esta página. Total 16 Páginas | ||
|
No Preview Available !
Low Power Ambient Light and Proximity Sensor with
Internal IR-LED and Digital Output
ISL29043
The ISL29043 is an integrated ambient and infrared
light-to-digital converter with a built-in IR LED and I2C Interface
(SMBus Compatible). This device uses two independent ADCs
for concurrently measuring ambient light and proximity in
parallel. The flexible interrupt scheme is designed for minimal
microcontroller utilization.
For ambient light sensor (ALS) data conversions, an ADC
converts photodiode current (with a light sensitivity range up to
2000 Lux) in 100ms per sample. The ADC rejects 50Hz/60Hz
flicker noise caused by artificial light sources.
For proximity sensor (Prox) data conversions, the built-in driver
turns on an internal infrared LED and the proximity sensor ADC
converts the reflected IR intensity to digital. This ADC rejects
ambient IR noise (such as sunlight) and has a 540μs
conversion time.
The ISL29043 provides low power operation of ALS and
proximity sensing with a typical 136μA normal operation
current (110μA for sensors and internal circuitry, ~28μA for
LED) with 220mA current pulses for a net 100μs, repeating
every 800ms (or under).
The ISL29043 uses both a hardware pin and software bits to
indicate an interrupt event has occurred. An ALS interrupt is
defined as a measurement that is outside a set window. A
proximity interrupt is defined as a measurement over a
threshold limit. The user may also require that both ALS/Prox
interrupts occur at once, up to 16 times in a row before
activating the interrupt pin.
The ISL29043 is designed to operate from 2.25V to 3.63V over
the -40°C to +85°C ambient temperature range. It is packaged in
a clear, lead-free 10 Ld ODFN package.
Features
• Internal LED + Sensor = Complete Solution
• Works Under All Light Sources Including Sunlight
• Dual ADCs Measure ALS/Prox Concurrently
• <1.0μA Supply Current When Powered Down
• Temperature Compensated
• Pb-Free (RoHS compliant)
Intelligent and Flexible Interrupts
• Independent ALS/Prox Interrupt Thresholds
• Adjustable Interrupt Persistency
- 1/4/8/16 Consecutive Triggers Required Before Interrupt
Applications
• Display and Keypad Dimming Adjustment and Proximity
Sensing for:
- Mobile Devices: Smart Phone, PDA, GPS
- Computing Devices: Laptop PC, Netbook, Tablet PC
- Consumer Devices: LCD-TV, Digital Picture Frame, Digital
Camera
- Industrial and Medical Light and Proximity Sensing
Related Literaturewww.DataSheet.net/
• See AN1436, “Proximity Sensors”
R1
10kΩ
VDD
VLED SLAVE_0
1 LED+ LED- 10
C1
1.0µF
2
ADDR0
IRDR
9
C2 C3
1µF 0.1µF
3 VDD
4 GND
5 REXT
INT 8
SDA 7
SCL 6
ISL29043
REXT
499kΩ
R2 R3
10kΩ 10kΩ
VI2C PULL-UP
SLAVE_1
SDA
SCL
I2C SLAVE_n
SDA
SCL
I2C MASTER
µCONTROLLER
INT
SDA
SCL
FIGURE 1. TYPICAL APPLICATION DIAGRAM
255
204
110mA (18% GREY CARD)
153 220mA (18% GREY CARD)
102 110mA (WHITE COPY PAPER)
220mA (WHITE COPY PAPER)
51
0
0 25 50 75 100 125
DISTANCE (mm)
FIGURE 2. PROXIMITY RESPONSE vs DISTANCE
150
February 9, 2012
FN7935.0
1
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
1-888-INTERSIL or 1-888-468-3774 |Copyright Intersil Americas Inc. 2012. All Rights Reserved
Intersil (and design) is a trademark owned by Intersil Corporation or one of its subsidiaries.
All other trademarks mentioned are the property of their respective owners.
Datasheet pdf - http://www.DataSheet4U.co.kr/
1 page  
ISL29043
I2C Electrical Specifications For SCL and SDA unless otherwise noted, VDD = 3V, TA = +25°C, REXT = 499kΩ 1% tolerance
(Note 11). (Continued)
PARAMETER
DESCRIPTION
CONDITION
MIN MAX
(Note 7) TYP (Note 7) UNIT
tHD:STA
Hold Time (Repeated) START Condition
After this period, the first clock pulse is
generated.
600
ns
tLOW
LOW Period of the SCL Clock
Measured at the 30% of VDD crossing.
tHIGH
HIGH period of the SCL Clock
tSU:STA
Set-up Time for a Repeated START Condition
tHD:DAT
Data Hold Time
tSU:DAT
Data Set-up Time
tR Rise Time of both SDA and SCL Signals
(Note 12)
tF Fall Time of both SDA and SCL Signals
(Note 12)
tSU:STO
Set-up Time for STOP Condition
tBUF Bus Free Time Between a STOP and START Condition
Cb Capacitive Load for Each Bus Line
Rpull-up
SDA and SCL System Bus Pull-up Resistor
Maximum is determined by tR and tF
tVD;DAT
Data Valid Time
tVD:ACK
Data Valid Acknowledge Time
VnL Noise Margin at the Low Level
VnH Noise Margin at the High Level
NOTES:
11. All parameters in I2C Electrical Specifications table are guaranteed by design and simulation.
12. Cb is the capacitance of the bus in pF.
www.DataSheet.net/
1300
600
600
30
100
20 + 0.1xCb
20 + 0.1xCb
600
1300
1
0.1VDD
0.2VDD
ns
ns
ns
ns
ns
ns
ns
ns
ns
400 pF
kΩ
0.9 µs
0.9 µs
V
V
FIGURE 3. I2C TIMING DIAGRAM
5
FN7935.0
February 9, 2012
Datasheet pdf - http://www.DataSheet4U.co.kr/
5 Page 
ISL29043
In Equation 2, Ecalc is the calculated lux reading and OUT
represents the ADC code. The constant α to plug in is determined
by the range bit ALS_RANGE (register 0x1 bit 1) and is
independent of the light source type.
TABLE 15. ALS SENSITIVITY AT DIFFERENT RANGES
ALS_RANGE
αRANGE
(Lux/Count)
1 0.029
2 0.469
Table 15 shows two different scale factors: one for the low range
(ALS_RANGE = 0) and the other for the high range
(ALS_RANGE = 1).
Noise Rejection
Charge balancing ADC’s have excellent noise-rejection
characteristics for periodic noise sources whose frequency is an
integer multiple of the conversion rate. For instance, a 60Hz AC
unwanted signal’s sum from 0ms to k*16.66ms (k = 1,2...ki) is zero.
Similarly, setting the device’s integration time to be an integer
multiple of the periodic noise signal greatly improves the light
sensor output signal in the presence of noise. Since wall sockets
may output at 60Hz or 50Hz, our integration time is 100ms: the
lowest common integer number of cycles for both frequencies.
Proximity Detection of Various Objects
Proximity sensing relies on the amount of IR reflected back from
objects. A perfectly black object would absorb all light and reflect
no photons. The ISL29043 is sensitive enough to detect black ESD
foam, which reflects only 1% of IR. For biological objects, blonde
hair reflects more than brown hair and customers may notice that
skin tissue is much more reflective than hair. IR penetrates into
the skin and is reflected or scattered back from within. As a result,
the proximity count peaks at contact and monotonically decreases
as skin moves away. The reflective characteristics of skin are very
different from that of paper.
Typical Opto-Mechanical Configuration
Typical applications for the ISL29043 involve use under a
cover-glass, or optical window. Typically, these glass components
are not coated to prevent unwanted reflections. Standard glass
and many plastic materials will reflect 4% of the incident light at
each surface. Reflected light emanating from the internal IR-LED
may be incident on the ALS/Proximity sensor and cause
significant DC-Offset in the detected signals. To prevent this
situation, the device should be used with a Light Baffle, as shown
in Figure 7. A Light Baffle prevents unwanted illumination from
the IR-LED from reaching the ALS/Proximity sensors while not
interfering with normal Ambient Light Sensing or Proximity
detection. The Baffle should be the limiting aperture for both the
IR-LED and the ALS/Prox sensor. Care should be taken to insure
there is no other obstruction in the light path.
A Light Baffle is made from a soft, compliant plastic, or rubber
material such as urethane, or silicone. The material should be
mechanically compliant since a designer desires it to fill the
separation between the PCB and the cover-glass and should not
produce undue stress on the thin cover-glass. A Light Baffle is
designed to fit completely over the ISL29043 package and may
be attached to the PCB with a dispensed adhesive. Typical
ISL29043 package height is 0.65 mm (see “Package Outline
Drawing” on page 16) and the inside lower cavity of the baffle is
0.4mm deep. With the cavity depth less than the package height,
the baffle does not reach fully to the PCB surface. This insures
that the internal barrier rests squarely on the top surface of the
package to prevent reflection of the IR-LED illumination toward
the sensor. The example Light Baffle in Figure 7 is shown with a
height of 1.1mm. However, the specific design-appropriate
height varies according to actual system design requirements. If
another material is chosen for a Light Baffle, the material should
be soft and compliant and also should be matte black in finish to
prevent reflection of the IR-LED illumination within a Light Baffle
and surrounding structures underneath the cover-glass.
Suggested Light Baffle PCB Footprint
The Light Baffle fits down over the entire ISL29043 package. The
lower wall thickness of the Light Baffle around the ISL29043
package is 0.3mm. Therefore, the PCB layout should allow for a
0.3mm clear-zone immediately around the ISL29043 with no
other surface components within this zone.
Operation Without a Light Baffle
For some product designs, it may be advantageous to use the
ISL29043 under the cover-glass without a Light Baffle. For these
applications, it is recommended that the opto-mechanical design
place the top surface of the ISL29043 package in direct contact
with the inside surface of the cover-glass. This configuration
significantly reduces the IR-LED illumination reflection from the
inside surface of the cover-glass and reduces the DC-Offset of the
proximity sensor. For typical operational performance
comparison,www.DataSheet.net/ Figure 8 shows a graph of the proximity response
for a standard 18% Kodak Gray Card target over a range of 0 to
100 mm for the same ISL29043 device with:
a. No cover-glass,
b. Cover-glass (0.9 mm thick, ~75%T at 850nm) with Light Baffle,
c. Cover-glass (0.9 mm thick, ~75%T at 850nm) without Light
Baffle and in contact with cover-glass, and,
d. Cover-glass (0.9 mm thick, ~75%T at 850nm) without Light
Baffle and spaced 0.1 mm below cover-glass.
Also, it is highly recommended that only IRDR = 110mA be used
when operating the ISL29043 without a a Light Baffle as the
IRDR = 220mA setting may cause a large DC-Offset even with
the ISL29043 placed in direct contact with the inside surface of
the cover glass.
11
FN7935.0
February 9, 2012
Datasheet pdf - http://www.DataSheet4U.co.kr/
11 Page | ||
| Páginas | Total 16 Páginas | |
| PDF Descargar | [ Datasheet ISL29043.PDF ] | |
Hoja de datos destacado
| Número de pieza | Descripción | Fabricantes |
| ISL29043 | Low Power Ambient Light and Proximity Sensor | Intersil Corporation |
| ISL29044 | Low Power Ambient Light and Proximity Sensor | Intersil Corporation |
| ISL29044A | Low Power Ambient Light and Proximity Sensor |  Intersil |
| Número de pieza | Descripción | Fabricantes |
| SLA6805M | High Voltage 3 phase Motor Driver IC. |
 Sanken |
| SDC1742 | 12- and 14-Bit Hybrid Synchro / Resolver-to-Digital Converters. |
 Analog Devices |
|
DataSheet.es es una pagina web que funciona como un repositorio de manuales o hoja de datos de muchos de los productos más populares, |
| DataSheet.es | 2020 | Privacy Policy | Contacto | Buscar |