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PDF ISL29028 Data sheet ( Hoja de datos )
| Número de pieza | ISL29028 | |
| Descripción | Low Power Ambient Light and Proximity Sensor | |
| Fabricantes | Intersil | |
| Logotipo |  |
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Low Power Ambient Light and Proximity Sensor
with Intelligent Interrupt and Sleep Modes
ISL29028
The ISL29028 is an integrated ambient and infrared
light-to-digital converter with a built-in IR LED driver
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 external 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 ISL29028 provides low power operation of ALS and
proximity sensing with a typical 138μA normal operation
current (110μA for sensors and internal circuitry, ~28μA
for external LED) with 220mA current pulses for a net
100μs, repeating every 800ms (or under).
The ISL29028 uses both a hardware pin and software
bits to indicate an interrupt event has occurred. An ALS
interrupt is defined as a measurement which 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 ISL29028 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 8 lead ODFN
package.
Pin Configuration
ISL29028
8 LD ODFN (2.0x2.1x0.7mm)
TOP VIEW
Features
• Works Under All Light Sources Including Sunlight
• Dual ADCs Measure ALS/Prox Concurrently
• Intelligent Interrupt Scheme Simplifies μC Code
Ambient Light Sensing
• Simple Output Code Directly Proportional to lux
• 50Hz/60Hz Flicker Noise and IR Rejection
• Light Sensor Close to Human Eye Response
• Selectable 125/2000 Lux Range
Proximity Sensing
• Proximity Sensor with Broad IR Spectrum
- Can Use 850nm and 950nm External IR LEDs
• IR LED Driver with I2C Programmable Sink Currents
- Net 100μs Pulse with 110mA or 220mA Amplitudes
- Periodic Sleep Time up to 800ms Between Pulses
• Ambient IR Noise Cancellation (Including Sunlight)
Intelligent and Flexible Interrupts
• Independent ALS/Prox Interrupt Thresholds
• Adjustable Interrupt Persistency
- 1/4/8/16 Consecutive Triggers Required Before
Interrupt
Ultra Low Power
• 138μA DC Typical Supply Current for ALS/Prox Sensing
- 110μA for Sensors and Internal Circuitry
- 28μA Typical Current for External IR LED (Assuming
220mA for 100μs Every 800ms)
• <1.0μA Supply Current When Powered Down
Easy to Use
• Set Registers; Wait for Interrupt
• I2C (SMBus Compatible) Output
• Temperature Compensated
• Tiny ODFN8 2.0x2.1x0.7 (mm) Package
Additional Features
• 1.7V to 3.63V Supply for I2C Interface
• 2.25V to 3.63V Sensor Power Supply
• Pb-Free (RoHS compliant)
• I2C Address Selection Pin
ADDR0 1
8 IRDR
VDD 2
GND 3
THERMAL
PAD
7 INT
6 SDA
REXT 4
5 SCL
*THERMAL PAD CAN BE CONNECTED TO GND OR
ELECTRICALLY ISOLATED
Applications*(see page 14)
• Display and Keypad Dimming Adjustment and
Proximity Sensing for:
- Mobile Devices: Smart Phone, PDA, GPS
- Computing Devices: Laptop PC, Netbook
- Consumer Devices: LCD-TV, Digital Picture Frame,
Digital Camera
• Industrial and Medical Light and Proximity Sensing
March 2, 2010
FN6780.1
1 CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
1-888-INTERSIL or 1-888-468-3774 | Intersil (and design) is a registered trademark of Intersil Americas Inc.
Copyright © Intersil Americas Inc. 2010. All Rights Reserved.
I2C Bus is a registered trademark owned by NXP Semiconductors Netherlands, B.V.
All other trademarks mentioned are the property of their respective owners.
1 page  
ISL29028
I2C Electrical Specifications For SCL and SDA unless otherwise noted, VDD = 3V, TA = +25°C, REXT = 499kΩ 1%
tolerance (Note 9). (Continued)
PARAMETER
DESCRIPTION
CONDITION
MIN TYP MAX UNIT
tBUF
Bus Free Time Between a STOP and START
Condition
1300
ns
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:
9. All parameters in I2C Electrical Specifications table are guaranteed by design and simulation.
10. Cb is the capacitance of the bus in pF.
1
0.1VDD
0.2VDD
400 pF
kΩ
0.9 µs
0.9 µs
V
V
FIGURE 1. I2C TIMING DIAGRAM
5 FN6780.1
March 2, 2010
5 Page 
ISL29028
Suggested PCB Footprint
It is important that users check the “Surface Mount
Assembly Guidelines for Optical Dual FlatPack No Lead
(ODFN) Package” before starting ODFN product board
mounting.
(http://www.intersil.com/data/tb/TB477.pdf)
Layout Considerations
The ISL29028 is relatively insensitive to layout. Like
other I2C devices, it is intended to provide excellent
performance even in significantly noisy environments.
There are only a few considerations that will ensure best
performance.
Route the supply and I2C traces as far as possible from all
sources of noise. A 0.1µF and 1µF power supply decoupling
capacitors need to be placed close to the device.
R1
10kΩ
R2 R3
10kΩ 10kΩ
VI2C_PULL-UP
VDD
VIR-LED
C1
1µF
C2
0.1µF
SLAVE_0
1 ADDR0 IRDR 8
2 VDD
3 GND
4 REXT
7
INT
SDA 6
SCL 5
REXT ISL29028
499kΩ
SLAVE_1
SDA
SCL
I2C SLAVE_n
SDA
SCL
FIGURE 5. ISL29028 TYPICAL CIRCUIT
I2C MASTER
MICROCONTROLLER
INT
SDA
SCL
Typical Performance Curves VDD = 3.0V, REXT = 499kΩ
1.0
0.9 FLUORESCENT
0.8
0.7
0.6
HALOGEN
0.5 INCAND.
0.4 SUN
0.3
0.2
0.1
0
350
550 750
WAVELENGTH (nm)
950
FIGURE 6. SPECTRUM OF FOUR LIGHT SOURCES
NORMALIZED BY LUMINOUS INTENSITY
(LUX)
1.0
0.9
0.8 ALS
0.7
0.6
0.5
0.4
0.3
0.2
0.1
0.0
300 400
HUMAN EYE
IR/PROX
500 600 700 800 900 1000 1100
WAVELENGTH (nm)
FIGURE 7. ISL29028 SENSITIVITY TO DIFFERENT
WAVELENGTHS
11 FN6780.1
March 2, 2010
11 Page | ||
| Páginas | Total 15 Páginas | |
| PDF Descargar | [ Datasheet ISL29028.PDF ] | |
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