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PDF ISL29018 Data sheet ( Hoja de datos )
| Número de pieza | ISL29018 | |
| Descripción | Digital Ambient Light Sensor And Proximity Sensor | |
| Fabricantes | Intersil Corporation | |
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Data Sheet
March 3, 2009
ISL29018
FN6619.0
Digital Ambient Light Sensor and
Proximity Sensor with Interrupt Function
www.TdahteasISheLe2t94u0.1c8omis an integrated ambient and infrared light to
digital converter with a built-in IR LED driver and I2C Interface
(SMBus Compatible). This device provides not only ambient
light sensing to allow robust backlight/display brightness
control but also infrared sensing to allow proximity estimation
featured with interrupt function.
For ambient light sensing, an internal ADC has been
designed based on the charge-balancing A/D conversion
technique. The ADC conversion time is nominally 90ms and
is user adjustable from 11µs to 90ms, depending on
oscillator frequency and ADC resolution. This ADC is
capable of rejecting 50Hz and 60Hz flicker noise caused by
artificial light sources. The lux-range-select feature allows
users to program the lux range for optimized counts/lux.
For proximity sensing, the ADC is used to digitize the output
signal from the photodiode array when the internal IR LED
driver is turned on and off for the programmed time periods
under user-selected modulation frequency to drive the
external IR LED. As this proximity sensor employs a noise
cancellation scheme to highly reject unwanted IR noise, the
digital output of proximity sensing decreases with distance.
The driver output current is user selectable up to 100mA to
drive different types of IR emitters LEDs.
Six different modes of operation can be selected via the I2C
interface: Programmable ALS once with auto power-down,
programmable IR sensing once, programmable proximity
sensing once, programmable continuous ALS sensing,
programmable continuous IR sensing and programmable
continuous proximity sensing. The programmable one-time
operation modes greatly reduce power because an immediate
automatic shutdown reduces overall supply current less than
0.5µA.
The ISL29018 supports both hardware and software
interrupts that remain asserted until the host clears it through
I2C interface for ambient light sensing and proximity
detection.
Designed to operate on supplies from 2.5V to 3.63V, the
ISL29018 is specified for operation over the -40°C to +85°C
ambient temperature range. It is packaged in a clear, Pb-free
8 Ld ODFN package.
Features
Proximity Sensing
• Ambient IR Cancellation During Proximity Sensing
- Works Under Direct Sunlight
• IR LED Driver with Programmable Source Current
- Adjustable Current Drive from 100mA to 12.5mA
• Programmable LED current Modulation Frequency
• Variable Conversion Resolution
Ambient Light Sensing
• Simple Output Code Directly Proportional to lux
• Adjustable Sensitivity up to 65 Counts per lux
• Selectable Range (via I2C)
- Range 1 = 0.015 lux to 1,000 lux
- Range 2 = 0.06 lux to 4,000 lux
- Range 3 = 0.24 lux to 16,000 lux
- Range 4 = 0.96 lux to 64,000 lux
• Integrated 50/60Hz Noise Rejection
• Works Under Various Light Sources, Including Sunlight
Ideal Spectral Response for Light and Proximity Sensor
• Light Sensor Close to Human Eye Response
- Excellent Light Sensor IR and UV Rejection
• Proximity sensor range from 850nm to 950nm
- Can use either 850nm or 950nm LED solution
Ultra Low Power
• 90μA Max Operating Current
• Software Shutdown and Automatic Shutdown
- 0.5μA Max Shutdown Current
Easy to Use
• I2C (SMBus Compatible) Output
• No Complex Algorithms Needed
• Temperature Compensated
• Small Form Factor
- 8 Ld 3.0mmx3.0mmx0.7mm ODFN Package
Additional Features
• I2C and SMBus Compatible
• 1.7V to 3.63V Supply for I2C Interface
• 2.25V to 3.63V Sensor Power Supply
• Pb-Free (RoHS compliant)
Applications
• Display and Keypad Dimming Adjustment and Proximity
Sensing for:
- Mobile Devices: Smart Phone, PDA, GPS
- Computing Devices: Notebook PC, Webpad
- Consumer Devices: LCD-TV, Digital Picture Frame, Digital
Camera
• Industrial and Medical Light and Proximity Sensing
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. 2009. All Rights Reserved.
All other trademarks mentioned are the property of their respective owners.
1 page  
ISL29018
Electrical Specifications VSUP(VDDD,VDDA) = 3V, TA = +25°C, REXT = 499kΩ 1% tolerance, 16-bit ADC operation, unless otherwise
specified. (Continued)
PARAMETER
DESCRIPTION
CONDITION
MIN TYP MAX UNIT
ISDA, IINT SDA and INT Current Sinking Capability
IIRDR1
IRDR Source Current
IIRDR2
IRDR Source Current
www.IdIRaDtaRs3heet4u.coIRmDR Source Current
IIRDR4
IRDR Source Current
VIRLED
Voltage Head Room of IRDR Pin
tr Rise Time for IRDR Source Current
tf Fall Time for IRDR Source Current
fIRLED1
IR LED Modulation Frequency
fIRLED2
IR LED Modulation Frequency
ISUP (IRLED1) Supply Current of Proximity Sensing
ISUP (IRLED2) Supply Current of Proximity Sensing
Duty Cycle Duty Cycle of IR LED Modulation
IS<1:0> = 0 (Note 5)
IS<1:0> = 1 (Note 5)
15Ω at IRDR pin
IS<1:0> = 2 (Note 5)
IS<1:0> = 3 (Note 5)
RLOAD = 15Ω at IRDR pin, 20% to 80%
RLOAD = 15Ω at IRDR pin, 80% to 20%
Freq = 0 (Note 5)
Freq = 1 (Note 5)
IS<1:0> = 0, Freq = 0 (Note 5)
IS<1:0> = 0, Freq = 1 (Note 5)
45
100
44 50 58
25
12.5
VDD - 0.6
35
10
DC
360
101
51
50
mA
mA
mA
mA
mA
V
ns
ns
kHz
kHz
mA
mA
%
PROX-IR
PROX
Differential ADC Output of IR and Proximity IR and proximity sensing with Range 2 and Scheme 0;
Sensing With Object Far Away to Provide 15Ω @ IRDR pin, IS<1:0> = 0, Freq = 0; E = 210 lux,
No Reflection
Sunlight.
1.0
%
NOTES:
2. VSUP is the common voltage to VDDD and VDDA.
3. 550nm green LED is used in production test. The 550nm LED irradiance is calibrated to produce the same DATA count against an illuminance
level of 300 lux fluorescent light.
4. 850nm infrared LED is used in production test. The 850nm LED irradiance is calibrated to produce the same DATA_IR count against an illuminance
level of 210 lux sunlight at sea level.
5. See “Register Set” on page 7.
Principles of Operation
Photodiodes and ADC
The ISL29018 contains two photodiode arrays which convert
light into current. The spectral response for ambient light
sensing and IR sensing is shown in Figure 6 in the performance
curves section. After light is converted to current during the light
signal process, the current output is converted to digital by a
built-in 16-bit Analog-to-Digital Converter (ADC). An I2C
command reads the ambient light or IR intensity in counts.
The converter is a charge-balancing integrating type 16-bit
ADC. The chosen method for conversion is best for converting
small current signals in the presence of an AC periodic noise. A
100ms integration time, for instance, highly rejects 50Hz and
60Hz power line noise simultaneously. See “Integration and
Conversion Time” on page 9.
The built-in ADC offers user flexibility in integration time or
conversion time. Integration time is determined by an internal
oscillator (fOSC), and the n-bit (n = 4, 8, 12,16) counter inside
the ADC. A good balancing act of integration time and
resolution depending on the application is required for optimal
results.
The ADC has I2C programmable range select to dynamically
accommodate various lighting conditions. For very dim
conditions, the ADC can be configured at its lowest range
(Range 1) in the ambient light sensing. For very bright
conditions, the ADC can be configured at its highest range
(Range 4) in the proximity sensing.
Low-Power Operation
The ISL29018 initial operation is at the power-down mode
after a supply voltage is provided. The data registers contain
the default value of 0. When the ISL29018 receives an I2C
command to do a one-time measurement from an I2C master,
it will start ADC conversion with light or proximity sensing. It
will go to the power-down mode automatically after one
conversion is finished and keep the conversion data available
for the master to fetch anytime afterwards. The ISL29018 will
continuously do ADC conversion with light or proximity
sensing if it receives an I2C command of continuous
measurement. It will continuously update the data registers
with the latest conversion data. It will go to the power-down
mode after it receives the I2C command of power-down.
Ambient Light, IR and Proximity Sensing
There are six operational modes in ISL29018: Programmable
ALS once with auto power-down, programmable IR sensing
once with auto power-down, programmable proximity sensing
once with auto power-down; programmable continuous ALS
sensing, programmable continuous IR sensing and
programmable continuous proximity sensing. These six
modes can be programmed in series to fulfill the application
5 FN6619.0
March 3, 2009
5 Page 
ISL29018
ALS 0.4ms
1µ
50µ
30ms
IR
www.datasheet4u.com
PROXIMITY
0.4ms
50µ
0.4ms
1mA
IR LED
360 kHz
50mA
FIGURE 3. CURRENT CONSUMPTION FOR EACH INTEGRATION PHASE AND DETECTION CYCLE
2.25V TO 3.63V
R1
10kΩ
R2 R3
10kΩ 10kΩ
1.7V TO 3.63V
SLAVE_0
1 VDDD IRDR 8
2 VDDA
3 GND
4
REXT
7
INT
SDA 6
5
SCL
REXT ISL29018
499k
SLAVE_1
SDA
SCL
I2C SLAVE_n
SDA
SCL
C1
0.1µ
FIGURE 4. ISL29018 TYPICAL CIRCUIT
I2C MASTER
MICROCONTROLLER
INT
SDA
SCL
11 FN6619.0
March 3, 2009
11 Page | ||
| Páginas | Total 15 Páginas | |
| PDF Descargar | [ Datasheet ISL29018.PDF ] | |
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