DATASHEET
ISL29028
Low Power Ambient Light and Proximity Sensor with Intelligent Interrupt and
Sleep Modes
The ISL29028 is an integrated ambient and infrared
light-to-digital converter with a built-in IR LED driver
and I
2
C 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.
FN6780
Rev 2.00
November 4, 2011
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 I
2
C 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
• I
2
C (SMBus Compatible) Output
• Temperature Compensated
• Tiny ODFN8 2.0x2.1x0.7 (mm) Package
Additional Features
• 1.7V to 3.63V Supply for I
2
C Interface
• 2.25V to 3.63V Sensor Power Supply
• Pb-Free (RoHS compliant)
• I
2
C Address Selection Pin
Pin Configuration
ISL29028
8 LD ODFN (2.0
x
2.1
x
0.7
mm
)
TOP VIEW
ADDR0
VDD
GND
REXT
1
2
3
4
THERMAL
PAD
8
7
6
5
IRDR
INT
SDA
SCL
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
*THERMAL PAD CAN BE CONNECTED TO GND OR
ELECTRICALLY ISOLATED
FN6780 Rev 2.00
November 4, 2011
Page 1 of 16
ISL29028
Ordering Information
PART NUMBER
(Notes 1, 2)
ISL29028IROZ-T7
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.
TEMP. RANGE
(°C)
-40 to +85
PACKAGE
TAPE AND REEL
(Pb-free)
8 Ld ODFN
PKG.
DWG. #
L8.2.1x2.0
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)
I
2
C 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
I
2
C clock line
I
2
C data line
The I
2
C bus lines can be pulled from 1.7V to above V
DD
, 3.63V
max
Interrupt pin; Logic output (open-drain) for interrupt
IR LED driver pin - current flows into ISL29028 from LED cathode
Block Diagram
VDD
2
ALS PHOTODIODE
ARRAY
COMMAND
REGISTER
LIGHT DATA
PROCESS
ALS AND IR
IR PHOTODIODE
ARRAY
IREF
FOSC
INTERRUPT
DUAL CHANNEL
ADCs
DATA
REGISTER
1
I
2
C
5
6
7
ADDR0
SCL
SDA
INT
IR DRIVER
4
REXT
3
GND
8
IRDR
FN6780 Rev 2.00
November 4, 2011
Page 2 of 16
ISL29028
Absolute Maximum Ratings
(T
A
= +25°C)
V
DD
Supply Voltage between V
DD
and GND . . . . . . . . . .4.0V
I
2
C Bus Pin Voltage (SCL, SDA) . . . . . . . . . . . -0.5V to 4.0V
I
2
C Bus Pin Current (SCL, SDA) . . . . . . . . . . . . . . . . <10mA
R
EXT
Pin Voltage . . . . . . . . . . . . . . . . -0.5V to VDD + 0.5V
IRDR Pin Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . .5.5V
ADDR0 Pin Voltage . . . . . . . . . . . . . . . -0.5V to VDD + 0.5V
INT Pin Voltage . . . . . . . . . . . . . . . . . . . . . . -0.5V to 4.0V
INT Pin Current . . . . . . . . . . . . . . . . . . . . . . . . . . . <10mA
ESD Rating
Human Body Model (Note 5) . . . . . . . . . . . . . . . . . . . 2kV
Thermal Information
Thermal Resistance (Typical, Note 4)
JA
(°C/W)
8 Ld ODFN. . . . . . . . . . . . . . . . . . . . . . . . .
88
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.intersil.com/pbfree/Pb-FreeReflow.asp
CAUTION: Do not operate at or near the maximum ratings listed for extended periods of time. Exposure to such conditions may adversely impact
product reliability and result in failures not covered by warranty.
NOTES:
4.
JA
is measured in free air with the component mounted on a high effective thermal conductivity test board with “direct attach”
features. See Tech Brief TB379.
5. ESD on all pins is 2kV except for IRDR, which is 1.5kV.
IMPORTANT NOTE: All parameters having Min/Max specifications are guaranteed. Typical values are for information purposes only. Unless
otherwise noted, all tests are at the specified temperature and are pulsed tests, therefore: T
J
= T
C
= T
A
Electrical Specifications
PARAMETER
V
DD
SR_V
DD
I
DD_OFF
I
DD_NORM
Power Supply Range
V
DD
= 3.0V, T
A
= +25°C, R
EXT
= 499k1% tolerance.
CONDITION
MIN TYP MAX UNIT
2.25
V
DD
Rising Edge between 0.4V and 2.25V
ALS_EN = 0; PROX_EN = 0
ALS_EN = 1; PROX_EN = 1
ALS_EN = 0; PROX_EN = 1
ALS_EN = 1; PROX_EN = 0
0.5
0.1
110
80
96
5.25
88
100
0.54
E
AMBIENT
= 0 lux, 2k Range
E
AMBIENT
> Selected Range Maximum Lux
(Note 9)
Ambient Light Sensing
±10
1
112
0.8
125
3.0
3.63
V
V/ms
µA
µA
µA
µA
MHz
ms
ms
Counts
4095 Counts
%
DESCRIPTION
Input Power-up Slew Rate
Supply Current when Powered Down
Supply Current for ALS+Prox in Sleep Time
I
DD_PRX_SLP
Supply Current for Prox in Sleep Time
I
DD_ALS
f
OSC
Supply Current for ALS
Internal Oscillator Frequency
t
INTGR_ALS
12-bit ALS Integration/Conversion Time
t
INTGR_PROX
8-bit Prox Integration/Conversion Time
DATA
ALS_0
ALS Result when Dark
DATA
ALS_F
Full Scale ALS ADC Code
ΔDATA
DATA
Count Output Variation Over Three Light
Sources: Fluorescent, Incandescent and
Sunlight
DATA
ALS_1
Light Count Output with LSB of
0.0326 lux/count
DATA
ALS_2
Light Count Output With LSB of
0.522 lux/count
DATA
PROX_0
Prox Measurement w/o Object in Path
DATA
PROX_F
Full Scale Prox ADC Code
DATA
PROX_1
Prox Measurement Result
t
r
t
f
I
IRDR_0
I
IRDR_1
Rise Time for IRDR Sink Current
Fall time for IRDR Sink Current
IRDR Sink Current
IRDR Sink Current
E = 53 lux, Fluorescent (Notes 6, 9),
ALS_RANGE = 0
E = 320 lux, Fluorescent (Note 6),
ALS_RANGE = 1
460
1638
614
1
Counts
768 Counts
Counts
255 Counts
(Note 7)
R
LOAD
= 15 at IRDR pin, 20% to 80%
R
LOAD
= 15 at IRDR pin, 80% to 20%
PROX_DR = 0; V
IRDR
= 0.5V
PROX_DR = 1; V
IRDR
= 0.5V
36
46
500
500
56
Counts
ns
ns
95
110
220
125
mA
mA
FN6780 Rev 2.00
November 4, 2011
Page 3 of 16
ISL29028
Electrical Specifications
PARAMETER
V
DD
= 3.0V, T
A
= +25°C, R
EXT
= 499k1% tolerance.
(Continued)
CONDITION
PROX_EN = 0; V
DD
= 3.63V (Note 8)
Register bit PROX_DR = 0
0.5
100
0.51
400
1.7
3.63
0.55
1.25
V
OL
= 0.4V
V
OL
= 0.4V
PROX_DR = 0; V
IRDR
= 0.5V to 4.3V
3
3
5
5
4
MIN TYP MAX UNIT
0.001
1
4.3
µA
V
µs
V
kHz
V
V
V
mA
mA
mA/V
DESCRIPTION
I
IRDR_LEAK
IRDR Leakage Current
V
IRDR
t
PULSE
V
REF
F
I2C
V
I2C
V
IL
V
IH
I
SDA
I
INT
PSRR
IRDR
NOTES:
Acceptable Voltage Range on IRDR Pin
Net I
IRDR
On Time Per PROX Reading
Voltage of R
EXT
Pin
I
2
C Clock Rate Range
Supply Voltage Range for I
2
C Interface
SCL and SDA Input Low Voltage
SCL and SDA Input High Voltage
SDA Current Sinking Capability
INT Current Sinking Capability
(I
IRDR
)/(V
IRDR
)
6. An LED is used in production test. The LED irradiance is calibrated to produce the same DATA count against a fluorescent light
source of the same lux level.
7. An 850nm infrared LED is used to test PROX/IR sensitivity in an internal test mode.
8. Ability to guarantee I
IRDR
leakage of ~1nA is limited by test hardware.
9. For ALS applications under light-distorting glass, please see the section titled
ALS Range 1 Considerations.
I2C Electrical Specifications
For SCL and SDA unless otherwise noted, V
DD
= 3V, T
A
= +25°C, R
EXT
= 499k 1%
tolerance (Note 10).
PARAMETER
V
I2C
f
SCL
V
IL
V
IH
V
hys
V
OL
I
i
t
SP
t
AA
C
i
t
HD:STA
t
LOW
t
HIGH
t
SU:STA
t
HD:DAT
t
SU:DAT
t
R
DESCRIPTION
Supply Voltage Range for I
2
C Interface
SCL Clock Frequency
SCL and SDA Input Low Voltage
SCL and SDA Input High Voltage
Hysteresis of Schmitt Trigger Input
Low-level output voltage (open-drain) at
4mA sink current
Input Leakage for each SDA, SCL pin
Pulse Width of Spikes that must be
Suppressed by the Input Filter
SCL Falling Edge to SDA Output Data Valid
Capacitance for each SDA and SCL pin
Hold Time (Repeated) START Condition
LOW Period of the SCL clock
HIGH period of the SCL Clock
Set-up Time for a Repeated START
Condition
Data Hold Time
Data Set-up Time
Rise Time of both SDA and SCL Signals
(Note 11)
After this period, the first clock pulse
is generated
Measured at the 30% of VDD
crossing
600
1300
600
600
30
100
20 + 0.1xC
b
-10
1.25
0.05V
DD
0.4
10
50
900
10
CONDITION
MIN
1.7
TYP MAX UNIT
3.63
400
0.55
V
kHz
V
V
V
V
µA
ns
ns
pF
ns
ns
ns
ns
ns
ns
ns
FN6780 Rev 2.00
November 4, 2011
Page 4 of 16
ISL29028
I2C Electrical Specifications
For SCL and SDA unless otherwise noted, V
DD
= 3V, T
A
= +25°C, R
EXT
= 499k 1%
tolerance (Note 10).
(Continued)
PARAMETER
t
F
t
SU:STO
t
BUF
C
b
R
pull-up
t
VD;DAT
t
VD:ACK
V
nL
V
nH
NOTES:
10. All parameters in I
2
C Electrical Specifications table are guaranteed by design and simulation.
11. C
b
is the capacitance of the bus in pF.
DESCRIPTION
Fall Time of both SDA and SCL Signals
Set-up Time for STOP Condition
Bus Free Time Between a STOP and START
Condition
Capacitive Load for Each Bus Line
SDA and SCL system bus pull-up resistor
Data Valid Time
Data Valid Acknowledge Time
Noise Margin at the LOW Level
Noise Margin at the HIGH Level
0.1VDD
0.2VDD
Maximum is determined by t
R
and t
F
1
0.9
0.9
(Note 11)
CONDITION
MIN
20 + 0.1xC
b
600
1300
400
TYP MAX UNIT
ns
ns
ns
pF
k
µs
µs
V
V
FIGURE 1. I
2
C TIMING DIAGRAM
FN6780 Rev 2.00
November 4, 2011
Page 5 of 16
51单片机
京公网安备 11010802033920号
Copyright © 2005-2026 EEWORLD.com.cn, Inc. All rights reserved
电子工程世界
