isl29028 Intersil Corporation, isl29028 Datasheet

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isl29028

Manufacturer Part Number
isl29028
Description
Low Power Ambient Light And Proximity Sensor With Intelligent Interrupt And Sleep Modes
Manufacturer
Intersil Corporation
Datasheet

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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 I
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
March 2, 2010
FN6780.1
2
C Interface (SMBus Compatible). This device uses
*THERMAL PAD CAN BE CONNECTED TO GND OR
ELECTRICALLY ISOLATED
ADDR0
REXT
GND
VDD
8 LD ODFN (2.0
1
2
3
4
TOP VIEW
THERMAL
ISL29028
PAD
1
x
2.1
x
0.7
8
7
6
5
mm
IRDR
INT
SDA
SCL
1-888-INTERSIL or 1-888-468-3774
)
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
I
2
C Bus is a registered trademark owned by NXP Semiconductors Netherlands, B.V.
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
• IR LED Driver with I
• Ambient IR Noise Cancellation (Including Sunlight)
Intelligent and Flexible Interrupts
• Independent ALS/Prox Interrupt Thresholds
• Adjustable Interrupt Persistency
Ultra Low Power
• 138μA DC Typical Supply Current for ALS/Prox Sensing
• <1.0μA Supply Current When Powered Down
Easy to Use
• Set Registers; Wait for Interrupt
• I
• Temperature Compensated
• Tiny ODFN8 2.0x2.1x0.7 (mm) Package
Additional Features
• 1.7V to 3.63V Supply for I
• 2.25V to 3.63V Sensor Power Supply
• Pb-Free (RoHS compliant)
• I
Applications*
• Display and Keypad Dimming Adjustment and
• Industrial and Medical Light and Proximity Sensing
- Can Use 850nm and 950nm External IR LEDs
- Net 100μs Pulse with 110mA or 220mA Amplitudes
- Periodic Sleep Time up to 800ms Between Pulses
- 1/4/8/16 Consecutive Triggers Required Before
- 110μA for Sensors and Internal Circuitry
- 28μA Typical Current for External IR LED (Assuming
Proximity Sensing for:
- Mobile Devices: Smart Phone, PDA, GPS
- Computing Devices: Laptop PC, Netbook
- Consumer Devices: LCD-TV, Digital Picture Frame,
All other trademarks mentioned are the property of their respective owners.
2
2
Interrupt
220mA for 100μs Every 800ms)
C (SMBus Compatible) Output
C Address Selection Pin
Digital Camera
|
Intersil (and design) is a registered trademark of Intersil Americas Inc.
Copyright © Intersil Americas Inc. 2010. All Rights Reserved.
2
C Programmable Sink Currents
(see page 14)
2
C Interface

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isl29028 Summary of contents

Page 1

... The user may also require that both ALS/prox interrupts occur at once 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 packaged in a clear, lead-free 8 lead ODFN package ...

Page 2

... Intersil Pb-free products are MSL classified at Pb-free peak reflow temperatures that meet or exceed the Pb-free requirements of IPC/JEDEC J STD-020. 3. For Moisture Sensitivity Level (MSL), please see device information page for ISL29028. For more information on MSL please see techbrief TB363. Pin Descriptions ...

Page 3

... I IRDR Sink Current IRDR_0 I IRDR Sink Current IRDR_1 I IRDR Leakage Current IRDR_LEAK 3 ISL29028 Thermal Information (T = +25°C) A Thermal Resistance (Typical, Note ODFN Maximum Die Temperature . . . . . . . . . . . . . . . . . . . +90°C Storage Temperature . . . . . . . . . . . . . . . . -40°C to +100°C Operating Temperature . . . . . . . . . . . . . . . -40°C to +85°C Pb-Free Reflow Profile . . . . . . . . . . . . . . . . . .see link below http://www ...

Page 4

... Data Set-up Time SU:DAT t Rise Time of both SDA and SCL Signals R t Fall Time of both SDA and SCL Signals F t Set-up Time for STOP Condition SU:STO 4 ISL29028 = 3.0V +25° 499kΩ 1% tolerance. (Continued EXT Register bit PROX_DR = Interface ...

Page 5

... NOTES All parameters Electrical Specifications table are guaranteed by design and simulation. 10 the capacitance of the bus in pF ISL29028 For SCL and SDA unless otherwise noted, V tolerance (Note 9). (Continued) CONDITION Maximum is determined FIGURE TIMING DIAGRAM = 3V +25° 499kΩ ...

Page 6

... There are ten 8-bit registers accessible via I Registers 0x3 through 0x7 store the various ALS/IR/Prox thresholds which trigger interrupt events. Registers 0x8 through 0xA store the results of ALS/IR/Prox ADC conversions. TABLE 1. ISL29028 REGISTERS AND REGISTER BITS ADDR REG NAME 7 ...

Page 7

... ACCESS DEFAULT 7:0 RW 0xFF 7 ISL29028 FUNCTION/OPERATION When = 0, no Prox interrupt event has occurred since power-on or last “clear” When = 1, a Prox interrupt event occurred. Clearable by writing “0” For bits 6:5 = (see the following) 00; set PROX_FLAG if 1 conversion result trips the threshold value 01 ...

Page 8

... For more information about the I consult the Philips Photodiodes and ADCs The ISL29028 contains two photodiode arrays which convert photons (light) into current. The ALS photodiodes are constructed to mimic the human eye’ bus wavelength response curve to visible light (see Figure 6). ...

Page 9

... C Registers FIGURE 4. CURRENT DRIVE MODE OPTIONS When the IR from the LED reaches an object and gets reflected back into the ISL29028, the reflected IR light is converted into current as per the IR spectral response shown in Figure 7. One entire proximity measurement takes 0.54ms for one conversion (which includes 0.1ms ...

Page 10

... Power-Down To put the ISL29028 into a power-down state, the user can set both PROX_EN and ALS_EN bits Register 1. Or more simply, set all of Register 1 to 0x00. ...

Page 11

... FIGURE 6. SPECTRUM OF FOUR LIGHT SOURCES NORMALIZED BY LUMINOUS INTENSITY (LUX) 11 ISL29028 Layout Considerations The ISL29028 is relatively insensitive to layout. Like other I performance even in significantly noisy environments. There are only a few considerations that will ensure best performance. Route the supply and I sources of noise. A 0.1µF and 1µF power supply decoupling capacitors need to be placed close to the device ...

Page 12

... GREY CARD 250 220mA MODE 200 110mA MODE 150 100 WHITE COPY PAPER 100 DISTANCE (mm) FIGURE 10. PROX COUNTS vs DISTANCE WITH 10CM x 10CM REFLECTOR (USING ISL29028 EVALUATION BOARD) 240 220mA-MODE (PROX_DR = 1) 220 200 180 160 140 120 110mA-MODE (PROX_DR = 0) 100 0 0.5 1.0 1.5 2.0 2.5 ...

Page 13

... Typical Performance Curves FIGURE 14. STABILITY OF ALS COUNT OVER-TEMPERATURE (AT 0.00 LUX) 2.00 0.43 FIGURE 15 ODFN SENSOR LOCATION OUTLINE - DIMENSIONS ISL29028 V = 3.0V EXT -40 10 TEMPERATURE (°C) 2. 499kΩ (Continued 0.42 0.50 FN6780.1 March 2, 2010 ...

Page 14

... No license is granted by implication or otherwise under any patent or patent rights of Intersil or its subsidiaries. For information regarding Intersil Corporation and its products, see 14 ISL29028 for a complete list of Intersil product families. ISL29028 www.intersil.com/askourstaff http://rel.intersil.com/reports/search.php www.intersil.com/product_tree www.intersil.com/design/quality CHANGE www ...

Page 15

... L8.2.1x2.0 8 LEAD OPTICAL DUAL FLAT NO-LEAD PLASTIC PACKAGE (ODFN) Rev 1, 12/09 2.10 6 PIN 1 INDEX AREA (2X) 0.10 TOP VIEW 2.50 2.10 (6x0.50) (8x0.20) (8x0.55) (0.75) TYPICAL RECOMMENDED LAND PATTERN 15 ISL29028 A B 0.50 2.00 1. ± 0.75 BOTTOM VIEW 0.70±0.05 SIDE VIEW (1.50 REF C (8x0.20) DETAIL "X" NOTES: 1. Dimensions are in millimeters. ...

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