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PDF ISL29015 Data sheet ( Hoja de datos )
| Número de pieza | ISL29015 | |
| Descripción | Integrated Digital Ambient Light Sensor and Proximity Sensor | |
| Fabricantes | Intersil Corporation | |
| Logotipo |  |
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ISL29015
®
www.DataSheet4U.com
Data Sheet
Integrated Digital Ambient Light Sensor
and Proximity Sensor
The ISL29015 is an integrated ambient and infrared light to
digital converter with a built-in IR LED driver and I2C/SMBus
interface. This device provides not only ambient light sensing
to allow robust backlight/display brightness control but also
infrared sensing to allow proximity estimation.
For ambient light sensing, an internal 16-bit ADC has been
designed based on the charge-balancing A/D conversion
technique. The ADC conversion time is nominally 100ms
and is user adjustable from 25µs to 100ms depends 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 1µA.
Designed to operate on supplies from 2.25V to 3.3V, the
ISL29015 is specified for operation over the -40°C to +85°C
ambient temperature range. It is packaged in a clear, Pb-free
6 Ld ODFN package.
Pinout
ISL29015
(6 LD ODFN)
TOP VIEW
VDD 1
GND 2
REXT 3
6 IRDR
5 SDA
4 SCL
*EXPOSED PAD CAN BE CONNECTED TO GND OR
ELECTRICALLY ISOLATED
October 31, 2008
FN6522.0
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 up to 16-bits
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
- 1.0μA Max Shutdown Current
• Software Shutdown and Automatic Shutdown
Easy to Use
• I2C (SMBus Compatible) Output
• No Complex Algorithms Needed
• Temperature Compensated
• Small Form Factor
- 2.0x2.1x0.7mm 6 Ld ODFN Package
Additional Features
• I2C and SMBus Compatible
• 1.7V to 3.63V Supply for I2C Interface
• 2.25V to 3.3V 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. 2008. All Rights Reserved.
All other trademarks mentioned are the property of their respective owners.
1 page  
ISL29015
programmable continuous proximity sensing. These six modes
can be programmed in series to fulfill the application needs.
Thwewdwe.tDaialetadSphreoegtr4aUm.cocomnfiguration is listed in “Register Set” on
page 6.
When the part is programmed for ambient light sensing, the
ambient light with wavelength within the “Ambient Light
Sensing” spectral response curve in Figure 6 is converted
into current. With ADC, the current is converted to an
unsigned n-bit (up to 16 bits) digital output.
When the part is programmed for infrared (IR) sensing, the
IR light with wavelength within the “IR or Proximity Sensing”
spectral response curve on Figure 6 is converted into
current. With ADC, the current is converted to an unsigned
n-bit (up to 16 bits) digital output.
When the part is programmed for proximity sensing, the
external IR LED is turned on by the built-in IR LED driver
through the IRDR pin. The amplitude of the IR LED current
and the IR LED modulation frequency can be programmed
through Command Register II. When the IR from the LED
reaches an object and gets reflected back, the reflected IR
light with wavelength within the “IR or Proximity Sensing”
spectral response curve in Figure 6 is converted into current.
With ADC, the current is converted to an unsigned n-bit (up
to 16 bits) digital output. The output reading is inversely
proportional to the square of the distance between the
sensor and the object. When there is significant background
IR noise like direct sunlight, both IR and proximity sensing
can be implemented for background noise cancellation. The
differential output reading from the ADC decreases with
distance.
I2C Interface
There are four 8-bit registers available inside the ISL29015.
The two command registers define the operation of the device.
The command registers do not change until the registers are
overwritten. The two 8-bit data Read Only registers are for the
ADC output. The data registers contain the ADC's latest digital
output, or the number of clock cycles in the previous integration
period.
The ISL29015’s I2C interface slave address is internally
hardwired as 1000100. When 1000100x with x as R or W is
sent after the Start condition, this device compares the first
seven bits of this byte to its address and matches.
Figure 1 shows a sample one-byte read. Figure 2 shows a
sample one-byte write. The I2C bus master always drives
the SCL (clock) line, while either the master or the slave can
drive the SDA (data) line. Figure 2 shows a sample write.
Every I2C transaction begins with the master asserting a
start condition (SDA falling while SCL remains high). The
following byte is driven by the master, and includes the slave
address and read/write bit. The receiving device is
responsible for pulling SDA low during the
acknowledgement period. Every I2C transaction ends with
the master asserting a stop condition (SDA rising while SCL
remains high).
For more information about the I2C standard, please consult
the Philips™ I2C specification documents.
I2C DATA START
DEVICE ADDRESS W A REGISTER ADDRESS
STOP START DEVICE ADDRESS
A
DATA BYTE0
I2C SDA
IN
I2C SDA
OUT
A6 A5 A4 A3 A2 A1 A0 W A R7 R6 R5 R4 R3 R2 R1 R0 A
SDA DRIVEN BY MASTER
A SDA DRIVEN BY MASTER A
A6 A5 A4 A3 A2 A1 A0 W A
SDA DRIVEN BY ISL29015
SDA DRIVEN BY MASTER
A D7 D6 D5 D4 D3 D2 D1 D0
I2C CLK
12 3456 789123456 789
123 45 67 89123456789
FIGURE 1. I2C READ TIMING DIAGRAM SAMPLE
5 FN6522.0
October 31, 2008
5 Page 
ISL29015
Typical Performance Curves VDD = 3V, Rext = 499kΩ (Continued)
10
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8
1.10
300 Lux FLUORESCENT LIGHT
ALS SENSING
1.05
6
1.00
4
0.95
2
0
-60 -20 20 60 100
TEMPERATURE (°C)
FIGURE 11. OUTPUT CODE FOR 0 LUX vs TEMPERATURE
0.90
-60
-20 20
60
TEMPERATURE (°C)
100
FIGURE 12. OUTPUT CODE vs TEMPERATURE
105.0
104.5
104.0
PROXIMITY SENSING
IS<1:0> = 0
103.5
103.0
102.5
102.0
101.5
101.0
100.5
100.0-40 -20
0 20 40 60 80 100 120
TEMPERATURE (°C)
FIGURE 13. OUTPUT CURRENT vs TEMPERATURE IN
PROXIMITY SENSING
90
ALS SENSING
10,000 Lux
85
80
75
70
65
60
-40 -20 0
20 40 60 80 100 120
TEMPERATURE (°C)
FIGURE 14. SUPPLY CURRENT vs TEMPERATURE IN ALS
SENSING
11 FN6522.0
October 31, 2008
11 Page | ||
| Páginas | Total 13 Páginas | |
| PDF Descargar | [ Datasheet ISL29015.PDF ] | |
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