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Renesas Electronics Components Datasheet

ISL29028 Datasheet

Low Power Ambient Light and Proximity Sensor

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DATASHEET
ISL29028
Low Power Ambient Light and Proximity Sensor with Intelligent Interrupt and
Sleep Modes
FN6780
Rev 2.00
November 4, 2011
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
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
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
Applications*(see page 15)
• 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
FN6780 Rev 2.00
November 4, 2011
Page 1 of 16


Renesas Electronics Components Datasheet

ISL29028 Datasheet

Low Power Ambient Light and Proximity Sensor

No Preview Available !

ISL29028
Ordering Information
PART NUMBER
(Notes 1, 2)
TEMP. RANGE
(°C)
PACKAGE
TAPE AND REEL
(Pb-free)
PKG.
DWG. #
ISL29028IROZ-T7
-40 to +85
8 Ld ODFN
L8.2.1x2.0
NOTES:
1. Please refer to TB347 for details on reel specifications.
2. These Intersil Pb-free plastic packaged products employ special Pb-free material sets; molding compounds/die attach
materials and NiPdAu plate - e4 termination finish, which is RoHS compliant and compatible with both SnPb and Pb-free
soldering operations. 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
PIN NUMBER
0
1
2
3
4
5
6
7
8
PIN NAME
T.PAD
ADDR0
VDD
GND
REXT
SCL
SDA
INT
IRDR
DESCRIPTION
Thermal Pad (connect to GND or float)
I2C address pin - pull high or low (do not float)
Positive supply: 2.25V to 3.63V
Ground
External resistor (499k; 1%) connects this pin to ground
I2C clock line
I2C data line
The I2C bus lines can be pulled from 1.7V to above VDD, 3.63V
max
Interrupt pin; Logic output (open-drain) for interrupt
IR LED driver pin - current flows into ISL29028 from LED cathode
Block Diagram
ALS PHOTODIODE
ARRAY
VDD
2
LIGHT DATA
PROCESS
ALS AND IR
IR PHOTODIODE
ARRAY
IREF
FOSC
DUAL CHANNEL
ADCs
4
REXT
3
GND
COMMAND
REGISTER
DATA
REGISTER
I2C
INTERRUPT
IR DRIVER
1 ADDR0
5 SCL
6 SDA
7 INT
8 IRDR
FN6780 Rev 2.00
November 4, 2011
Page 2 of 16


Part Number ISL29028
Description Low Power Ambient Light and Proximity Sensor
Maker Renesas
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ISL29028 Datasheet PDF






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