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ISL29011 の電気的特性と機能

ISL29011のメーカーはIntersil Corporationです、この部品の機能は「Digital Ambient Light Sensor And Proximity Sensor」です。


製品の詳細 ( Datasheet PDF )

部品番号 ISL29011
部品説明 Digital Ambient Light Sensor And Proximity Sensor
メーカ Intersil Corporation
ロゴ Intersil Corporation ロゴ 




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ISL29011 Datasheet, ISL29011 PDF,ピン配置, 機能
®
Data Sheet
April 10, 2009
ISL29011
FN6467.1
Digital Ambient Light Sensor and
Proximity Sensor with Interrupt Function
www.TdahteasISheLe2t94u0.1c1omis 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 ISL29011 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
ISL29011 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 2.0mmx2.1mmx0.7mm 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





ISL29011 pdf, ピン配列
Block Diagram
PHOTODIODE
ARRAY
ISL29011
VDDA
2
www.datasheet4u.com
LIGHT DATA
PROCESS
ALS AND IR
IR PHOTODIODE
ARRAY
IREF
FOSC
INTEGRATION
ADC
4
REXT
3
GND
ISL29011
VDDD
1
COMMAND
REGISTER
DATA
REGISTER
I2C
INTERRUPT
IR DRIVER
6 SDA
5 SCL
7 INT
8 IRDR
3 FN6467.1
April 10, 2009


3Pages


ISL29011 電子部品, 半導体
ISL29011
needs. The detailed program configuration is listed in
“Register Set” on page 7.
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
www.udantsaisghneeedt4nu-.cboitm(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.
Interrupt Function
The active low interrupt pin is an open drain pull-down
configuration. There is also an interrupt bit in the I2C register.
The interrupt serves as an alarm or monitoring function to
determine whether the ambient light level or the proximity
detection level exceeds the upper threshold or goes below the
lower threshold. The user can also configure the persistency
of the interrupt. This reduces the possibility of false triggers,
such as noise or sudden spikes in ambient light conditions. An
unexpected camera flash, for example, can be ignored by
setting the persistency to 8 integration cycles.
I2C Interface
There are eight 8-bit registers available inside the ISL29011.
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 and the Timer output. The data registers contain
the ADC's latest digital output, or the number of clock cycles in
the previous integration period. The four 8-bit interrupt registers
hold 16-bit interrupt high and low thresholds.
The ISL29011’s I2C interface slave address is internally
hard-wired 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 PhilipsI2C 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 ISL29011
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
6 FN6467.1
April 10, 2009

6 Page



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共有リンク

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