ISL29001 Datasheet PDF - Intersil Corporation
|Ambient Light Sensor
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December 21, 2005
Ambient Light Sensor
The ISL29001 is an integrated ambient light sensor with
ADC and I2C interface. With a spectral sensitivity curve
matched to that of the human eye, the ISL29001 provides
15-bit effective resolution while rejecting 50Hz and 60Hz
flicker caused by artificial light sources.
In normal operation, the ISL29001 consumes less than
300µA of supply current. A software power-down mode
controlled via the I2C interface disables all but the I2C
interface. A power-down pin is also provided which reduces
power consumption to less than 1µA.
The ISL29001 includes an internal oscillator which provides
100ms automatic integration periods, or can be externally
timed by I2C commands. Both the internal timing and the
illuminance resolution can be adjusted with an external
Designed to operate on supplies from 2.5V to 3.3V, the
ISL29001 is specified for operation over the -40°C to +85°C
ambient temperature range. It is packaged in a clear 6-pin
TAPE & REEL PKG. DWG. #
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.
• Human eye response
• Temperature compensated
• 15-bit effective resolution
• Adjustable resolution: 3 to 15 counts per lux
• Simple output code, directly proportional to lux
• 0.3 lux to 10,000 lux range
• IR rejection
• 50Hz/60Hz rejection
• I2C interface
• 2.5V to 3.3V supply
• 6-pin ODFN (2.1mm x 2mm)
• Pb-Free plus anneal available (RoHS compliant)
• Ambient light sensing
• Ambient backlight control
• Temperature control systems
• Contrast control
• Camera light meters
• Lighting controls
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. 2005. All Rights Reserved.
All other trademarks mentioned are the property of their respective owners.
Principles of Operation
Photodiodes and ADC
The ISL29001 contains two photodiodes. One of the
photodiodes is sensitive to visible and infrared light (Diode 1)
and the other is sensitive primarily to infrared light (Diode 2).
The ISL29001 also contains an on-chip integrating analog-
to-digital converter (ADC) to convert photodiode currents
into digital data.
The ADC has three operating modes with two timing
controls. (Please consult Table 1 for a complete list of
modes.) In the first operating mode, the ADC only integrates
Diode 1's current, and the digital output format is 16-bit
unsigned-magnitude. In second operating mode, the ADC's
operation is the same, except Diode 2's current is integrated.
In the third operating mode, the ADC integrates Diode 2's
current first, then Diode 1's current. The total integration time
is doubled, and the digital output is the difference of the two
photodiode currents (Diode 1’s current - Diode 2’s current).
In this mode, the digital output format is 16-bit 2's-
complement. Any of the three operating modes can be used
with either of the two timing controls (either internally or
externally controlled integration timing).
The interface to the ADC is implemented using the standard
The ISL29001 contains a single 8-bit command register that
can be written via the I2C interface. The command register
defines the operation of the device, which does not change
until the command register is overwritten.
The ISL29001 contains four 8-bit data registers that can be
read via the I2C interface. The first two data registers contain
the ADC's latest digital output, while the second two
registers contain the number of clock cycles in the previous
The ISL29001’s I2C address is hardwired internally as
Figure 11 shows a sample one-byte read. (A typical
application will read two to four bytes, however.) The I2C bus
master always drives the SCL (clock) line, while either the
master or the slave can drive the SDA (data) line. 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.
Any writes to the ISL29001 overwrite the command register,
changing the device’s mode. Any reads from the ISL29001
return two or four bytes of sensor data and counter value,
depending upon the operating mode. Neither the command
register nor the data registers have internal addresses, and
none of the registers can be individually addressed.
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.
The command register is used to define the ADC's
operations. Table 1 shows the primary commands used to
control the ADC.
Note that there are two classes of operating commands:
three for internal timing, and three for external (arbitrary)
When using any of the three internal timing commands, the
device self-times each conversion, which is nominally 100ms
(with REXT = 100kΩ).
When using any of the three external timing commands,
each command received by the device ends one conversion
and begins another. The integration time of the device is
thus the time between one I2C external timing command and
the next. The integration time can be between 1 and 100
milliseconds. The external timing commands can be used to
SDA DRIVEN BY MASTER
SDA DRIVEN BY ISL29002
1-7 8 9
FIGURE 11. I2C TIMING DIAGRAM
December 21, 2005
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