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PDF ISL29004 Data sheet ( Hoja de datos )
| Número de pieza | ISL29004 | |
| Descripción | Light-to-Digital Output Sensor | |
| Fabricantes | Intersil Corporation | |
| Logotipo |  |
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Data Sheet
December 21, 2006
ISL29004
FN6221.0
Light-to-Digital Output Sensor with
Address Selection, High Sensitivity, Gain
Selection, Interrupt Function and I2C
Interface
The ISL29004 is an integrated light sensor with a 16-bit
integrating type ADC, I2C user programmable Lux range
select for optimized counts/Lux, and I2C multi-function
control and monitoring capabilities. The internal ADC
provides 16-bit resolution while rejecting 50Hz and 60Hz
flicker caused by artificial light sources.
In normal operation, power consumption is typically 300µA.
Futhermore, an available software power-down mode
controlled via the I2C interface reduces power consumption
to less than 1µA. The device also support a hardware
interrupt that remains asserted low until the host clears it
through I2C interface.
The ISL29004 is in an 8 Ld ODFN package and has two I2C
address pins for multiple devices on the same bus. The
ISL29003 is a similar light sensor with a hardwired I2C
address that is available in ODFN6 package.
Designed to operate on supplies from 2.5V to 3.3V, the
www.DataSheet4U.coImSL29004 are specified for operation over the -40°C to
+85°C ambient temperature range.
Ordering Information
PART NUMBER
(Note)
TAPE &
REEL
PACKAGE
(Pb-Free)
PKG.
DWG. #
ISL29004IROZ
- 8 Ld ODFN
MDP0052
ISL29004IROZ-T7
7” 8 Ld ODFN Tape MDP0052
and Reel
ISL29004IROZ-EVALZ Evaluation Board (Pb-free)
NOTE: Intersil Pb-free plus anneal products employ special Pb-free
material sets; molding compounds/die attach materials and 100%
matte tin plate termination finish, which are 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.
Pinout
ISL29004
(8 LD ODFN)
TOP VIEW
VDD 1
GND 2
REXT 3
A0 4
THERMAL
PAD
8 SDA
7 SCL
6 INT
5 A1
Features
• Range select via I2C
- Range1 = 1000Lux
- Range2 = 4000Lux
- Range3 = 16,000Lux
- Range4 = 64,000Lux
• Human eye response (540nm peak sensitivity)
• Temperature compensated
• 16-bit resolution
• Adjustable resolution: up to 65 counts per Lux
• User-programmable upper and lower threshold interrupt
• Simple output code, directly proportional to Lux
• 50Hz/60Hz rejection
• 2.5V to 3.3V supply
• 8 Ld ODFN (3mmx3mm)
• I2C address selection
Applications
• Ambient light sensing
• Backlight control
• Temperature control systems
• Contrast control
• Camera light meters
• Lighting controls
Block Diagram
PHOTODIODE 1
1
MUX
INTEGRATING
ADC
PHOTODIODE 2
IREF
FOSC
3
REXT
EXT
TIMING
216
COUNTER
2
GND
ISL29004
COMMAND
REGISTER
DATA
REGISTER
I2C
INT
INTERRUPT
8 SDA
7 SCL
4 A0
5 A1
6 INT
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. 2006. All Rights Reserved.
All other trademarks mentioned are the property of their respective owners.
1 page  
ISL29004
I2C DATA
Start
DEVICE ADDRESS
W A REGISTER ADDRESS
A STOP
START
DEVICE ADDRESS
A
DATA BYTE0
A STOP
I2C SDA
In
A6 A5 A4 A3 A2 A1 A0 W A R7 R6 R5 R4 R3 R2 R1 R0 A
A6 A5 A4 A3 A2 A1 A0 W A
SDA DRIVEN BY ISL29003
NAK
I2C SDA
Out
SDA DRIVEN BY MASTER
A SDA DRIVEN BY MASTER A
SDA DRIVEN BY MASTER
A D7 D6 D5 D4 D3 D2 D1 D0 A
I2C CLK
123456789123456789
123456789123456789
FIGURE 1. I2C READ TIMING DIAGRAM SAMPLE
I2C DATA
I2C SDA In
Start
DEVICE ADDRESS
W A REGISTER ADDRESS
A
FUNCTIONS
A STOP
A6 A5 A4 A3 A2 A1 A0 W A R7 R6 R5 R4 R3 R2 R1 R0 A B7 B6 B5 B4 B3 B2 B1 B0 A
I2C SDA Out
SDA DRIVEN BY MASTER
A SDA DRIVEN BY MASTER A SDA DRIVEN BY MASTER A
I2C CLK In
123456789123456789123456789
FIGURE 2. I2C WRITE TIMING DIAGRAM SAMPLE
I2C DATA
I2C SDA In
Start
DEVICE ADDRESS
W A REGISTER ADDRESS
A Stop
A6 A5 A4 A3 A2 A1 A0 W A R7 R6 R5 R4 R3 R2 R1 R0 A
I2C SDA Out
SDA DRIVEN BY MASTER
A SDA DRIVEN BY MASTER A
I2C CLK In
123456789123456789
FIGURE 3. I2C sync_iic TIMING DIAGRAM SAMPLE
5 FN6221.0
December 21, 2006
5 Page 
ISL29004
The Full Scale Range, FSR, needs to be determined. From
Equation 3:
FSR
=
1000 L
ux
1----0---0----k---Ω---
50 k Ω
FSR = 2000Lux
The effective transfer function becomes:
E
=
-d----a---t---a--
216
×
2000 L u x
TABLE 14. SOLUTION1 SUMMARY TO EXAMPLE DESIGN
PROBLEM
DESIGN PARAMETER
VALUE
Tint
REXT
Gain/Range Mode
100ms
50kΩ
Range1 = 1000Lux
FSR
# of clock cycles
2000Lux
216
Transfer Function
E
=
D-----A-----T----A-- × 2000Lux
216
Solution 2 - Using External Timing Mode
From solution 1, the desired integration time is 100ms. Note
that the REXT resistor only determines the inter oscillator
frequency when using external timing mode. Instead the
integration time is the time between two sync_iic commands
sent through the I2C. The programmer determines how
many I2C clock cycles to wait between two external timing
commands.
iI2C = fI2C * Tint = number of I2C clock cycles
iI2C = 10kHz *100ms
iI2C = 1,000 I2C clock cycles. An external sync_iic command
sent 1,000 cycles after another sync_iic command rejects
both 60Hz and 50Hz AC noise signals.
Next is to pick an arbitrary REXT = 100kΩ and to choose the
Gain/Range Mode. For a maximum 500Lux, Range1 is
adequate. From Equation 3:
FSR = 1000lux11----00---00----kk---ΩΩ---
FSR = 1000Lux
The effective transfer function becomes:
E
=
--------D-----A----T----A----------
COUNTER
× 1000Lux
DATA is the sensor reading data located in data registers
04(hex) and 05(hex)
COUNTER is the timer counter value data located in data
registers 06(hex) and 07(hex). In this sample problem,
COUNTER = 1000.
TABLE 15. SOLUTION2 SUMMARY TO EXAMPLE DESIGN
PROBLEM
DESIGN PARAMETER
VALUE
Tint
REXT
Gain/Range Mode
100ms
100kΩ
Range1 = 1000Lux
FSR
1000Lux
# of clock cycles
COUNTER = 1000
Transfer Function
E
=
--------D-----A----T----A----------
COUNTER
× 1000Lux
Light Source Detection and Infra-Red Rejection
Any filament type light source has a high presence of infrared
component invisible to the human eye. A white fluorescent
lamp, on the other hand has a low IR content. As a result,
output sensitivity may vary depending on the light source.
Maximum attenuation of IR can be achieved by properly
scaling the readings of Diode1 and Diode2. The user obtains
data reading from sensor diode 1, D1, which is sensitive to
visible and IR, then reading from sensor diode 2, D2 which is
mostly sensitive from IR. The graph on Figure 7 shows the
effective spectral response after applying Equation 15 of the
ISL29003 from 400nm to 1000nm. The equation below
describes the method of cancelling IR in internal timing mode.
D3 = n(D1 – kD2)
(EQ. 15)
Where:
D3 = Lux amount in number of counts less IR presence
D1 = data reading of Diode 1
D2 = data reading of Diode 2
n = 1.355. This is a fudge factor to scale back the sensitivity
up to ensure Equation 4 is valid.
k = 3.355. This is a scaling factor for the IR sensitive
Diode 2.
Flat Window Lens Design
A window lens will surely limit the viewing angle of the
ISL29004. The window lens should be placed directly on top
of the device. The thickness of the lens should be kept at
minimum to minimize loss of power due to reflection and
also to minimize loss of loss due to absorption of energy in
the plastic material. A thickness of t = 1mm is recommended
for a window lens design. The bigger the diameter of the
window lens the wider the viewing angle is of the ISL29001.
Table 16 shows the recommended dimensions of the optical
window to ensure both +35° and +45° viewing angle. These
11 FN6221.0
December 21, 2006
11 Page | ||
| Páginas | Total 17 Páginas | |
| PDF Descargar | [ Datasheet ISL29004.PDF ] | |
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