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ISL29001
Data Sheet December 21, 2005 FN6166.0
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 300A 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 1A. 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 resistor. Designed to operate on supplies from 2.5V to 3.3V, the ISL29001 is specified for operation over the -40C to +85C ambient temperature range. It is packaged in a clear 6-pin ODFN package.
Features
* 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)
Applications
* Ambient light sensing * Ambient backlight control * Temperature control systems
Ordering Information
PART NUMBER ISL29001IROZ (See Note) PACKAGE 6-Pin ODFN (Pb-Free) TAPE & REEL PKG. DWG. # MDP0052
* Contrast control * Camera light meters * Lighting controls * HVAC
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.
Block Diagram
VDD PD
Pinout
ISL29001 (6-PIN ODFN) TOP VIEW
TEMPERATURE COMPENSATED LIGHT SENSOR
I2C INTERFACE
50Hz/60Hz REJECTION
16-bit ADC
SDA SCL
VDD 1 GND 2 REXT 3
THERMAL PAD
6 SDA 5 SCL 4 PD
GND
REXT
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 (c) Intersil Americas Inc. 2005. All Rights Reserved. All other trademarks mentioned are the property of their respective owners.
ISL29001
Absolute Maximum Ratings (TA = 25C)
Maximum Supply Voltage between VDD and GND . . . . . . . . . . 3.6V I2C Bus Pin Voltage (SCL, SDA) . . . . . . . . . . . . . . . . . -0.2V to 5.5V I2C Bus Pin Current (SCL, SDA) . . . . . . . . . . . . . . . . . . . . . . <10mA Rext Pin Voltage. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.2V to 3.6V Operating Temperature . . . . . . . . . . . . . . . . . . . . . . .-45C to +85C Maximum Die Temperature . . . . . . . . . . . . . . . . . . . . . . . . . . +125C Storage Temperature . . . . . . . . . . . . . . . . . . . . . . . .-45C to +100C ESD Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2kV
CAUTION: Stresses above those listed in "Absolute Maximum Ratings" may cause permanent damage to the device. This is a stress only rating and operation of the device at these or any other conditions above those indicated in the operational sections of this specification is not implied. IMPORTANT NOTE: All parameters having Min/Max specifications are guaranteed. Typical values are for information purposes only. Unless otherwise noted, all tests are at the specified temperature and are pulsed tests, therefore: TJ = TC = TA
Electrical Specifications
PARAMETER VDD IDD IDD1 IDD2 FUPD Fosc FI2C DATA0 DATA1 DATA2 DATA3 VREF NOTES: 1. See Principle of Operation
VDD = 3V, TA = 25C, REXT = 100k, internally controlled integration timing (Note 1), unless otherwise specified. CONDITION MIN 2.25 0.28 Software disabled PD = 3V Mode 1 & Mode 2 (Note 2) 85 105 312 1 Ev = 0 lux Full scale ADC count value Ev = 300 lux, fluorescent light, Mode 1 Ev = 300 lux, fluorescent light, Mode 2 0.487 738 983 98 0.51 0.532 400 1 32768 1247 0.09 TYP MAX 3.63 0.33 0.10 0.5 126 UNIT V mA mA A ms kHz kHz Counts Counts Counts Counts V
DESCRIPTION Power Supply Range Supply Current Supply Current Supply Current Internal Update Time Internal Oscillator Frequency I2C Clock Rate ADC Code ADC Code ADC Code ADC Code Voltage of REXT Pin
2. There are three modes of the ADC's operations. In Mode 1, the ADC integrates the current of the photodiode which is sensitive to visible and infrared light. In Mode 2, the ADC integrates the current of the photodiode which is sensitive only to infrared light.
Pin Descriptions
PIN NUMBER 1 2 3 4 5 6 PIN NAME VDD GND PD REXT SCL SDA DESCRIPTION Positive supply. Connect this pin to a clean 2.5V to 3.3V supply. Ground pin Power-down pin. This pin is active-high. Applying a logic "high" to this pin will put the device into power down mode. External resistor pin for ADC reference. Connect this pin to ground through a (nominal) 100k resistor. I2C serial clock I2C serial data
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ISL29001 Typical Performance Curves (Rext = 100k)
320 306 SUPPLY CURRENT (A) 292 278
10
Ta = 27oC COMMAND = 00H 5000 lux
OUTPUT CODE (COUNTS)
8 6 4 2 0 2.0
Ta = 27oC COMMAND = 00H 0 lux
200 lux 264 250 2.0
2.3
2.6 2.9 3.2 SUPPLY VOLTAGE (V)
3.5
3.8
2.3
2.6 2.9 3.2 SUPPLY VOLTAGE (V)
3.5
3.8
FIGURE 1. SUPPLY CURRENT vs SUPPLY VOLTAGE
FIGURE 2. OUTPUT CODE FOR 0 LUX vs SUPPLY VOLTAGE
1.015 1.010 OUTPUT CODE RATIO (% FROM 3V) 1.005 1.000 200 lux 0.995 0.990 2.0
320.0 OSCILLATOR FREQUENCY (kHz)
Ta = 27oC COMMAND = 00H 5000 lux
Ta = 27oC 319.5
319.0
318.5
2.3
2.6 2.9 3.2 SUPPLY VOLTAGE (V)
3.5
3.8
318.0 2.0
2.3
2.6 2.9 3.2 SUPPLY VOLTAGE (V)
3.5
3.8
FIGURE 3. OUTPUT CODE vs SUPPLY VOLTAGE
FIGURE 4. OSCILLATOR FREQUENCY vs SUPPLY VOLTAGE
315 305 SUPPLY CURRENT (A) 295 285
10
Vdd = 3V COMMAND = 00H 5000 lux
OUTPUT CODE (COUNTS)
8 6 4 2 0 -60
Vdd = 3V COMMAND = 00H 0 lux
200 lux 275 265 -60
-20
20 60 TEMPERATURE ( oC)
100
-20
20 60 TEMPERATURE ( oC)
100
FIGURE 5. SUPPLY CURRENT vs TEMPERATURE
FIGURE 6. OUTPUT CODE FOR 0 LUX vs TEMPERATURE
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ISL29001 Typical Performance Curves (Rext = 100k)
1.080 1.048 OUTPUT CODE RATIO (% FROM 25oC) 1.016 200 lux 0.984 0.952 0.920 -60
(Continued)
OSCILLATOR FREQUENCY (kHz)
Vdd = 3V COMMAND = 00H 5000 lux
330 Vdd = 3V 329 328 327 326 325 -60
-20
20 60 TEMPERATURE ( oC)
100
-20
20 60 TEMPERATURE ( oC)
100
FIGURE 7. OUTPUT CODE vs TEMPERATURE
FIGURE 8. OSCILLATOR FREQUENCY vs TEMPERATURE
100 RELATIVE SENSITIVITY (%)
Diode 1
R AD IAT ION P AT T E R N
LUMINO S IT Y ANG LE
75
50
25
0 428 444 460 476 492 508 524 540 556 572 588 604 620 636 652 668
SPECTRAL WAVELENGTH (nm)
R E LA T IV E S E N S IT IV IT Y
FIGURE 10. RADIATION PATTERN
FIGURE 9. RELATIVE SENSITIVITY
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ISL29001 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 analogto-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'scomplement. 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 I2C interface. 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(R) I2C specification documents.
Command Register
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) timing. When using any of the three internal timing commands, the device self-times each conversion, which is nominally 100ms (with REXT = 100k). 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
I2C Interface
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 integration period. The ISL29001's I2C address is hardwired internally as 1000100. Figure 11 shows a sample one-byte read. (A typical application will read two to four bytes, however.) The I2C bus
SDA DRIVEN BY MASTER
SDA DRIVEN BY ISL29002
SDA SCL 1-7 START ADDRESS 8 R/W 9 ACK 1-7 DATA 8 9 ACK STOP
FIGURE 11. I2C TIMING DIAGRAM
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ISL29001
synchronize the ADC's integrating time to a PWM dimming frequency in a backlight system in order to eliminate noise.
TABLE 1. COMMAND 8cH 0cH 00H FUNCTION ADC is powered-down. ADC is reset. ADC converts Diode 1's current (IDIODE1) into unsigned-magnitude 16-bit data. The integration is internally timed at 100ms per integration. ADC converts Diode 2's current (IDIODE2) into unsigned-magnitude 16-bit data. The integration is internally timed at 100ms per integration. ADC converts IDIODE1-IDIODE2 into 2'scomplement 16-bit data. The total integration is internally timed at 200ms per integration. ADC converts Diode 1's current (IDIODE1) into unsigned-magnitude 16-bit data. The integration is externally timed; each 30H command sent to the device ends one integration period and begins another. ADC converts Diode 2's current (IDIODE1) into unsigned-magnitude 16-bit data. The integration is externally timed; each 34H command sent to the device ends one integration period and begins another. ADC converts IDIODE1-IDIODE2 into 2'scomplement 16-bit data. The integration is externally timed; each 38H command sent to the device ends one integration period and begins another. I2C communication test. The value written to the command register can be read back via the I2C bus.
The first two 8-bit data registers contain the most recent sensor reading. The meaning of the specific value stored in these data registers depends on the command written via the I2C interface; see Table 1 for information on the various commands. The first byte read over the I2C interface is the least-significant byte; the second is the most significant. This byte ordering is often called "little-endian" ordering. The third and fourth 8-bit data registers contain the integration counter value corresponding to the most recent sensor reading. The ISL29001 includes a free-running oscillator, each cycle of which increments a 16-bit counter. At the end of each integration period, the value of this counter is made available in these two 8-bit registers. Like the sensor reading, the integration counter value is read across the I2C bus in little-endian order. Note that the integration counter value is only available when using one of the three externally-timed operating modes; when using internally-timed modes, the device will NAK after the two-byte sensor reading has been read.
04H
08H
30H
Internal Timing
When using one of the three internal timing modes, each integration period of the ISL29001 is timed by 32,768 clock cycles of an internal oscillator. The nominal frequency of the internal oscillator is 327.6kHz, which provides 100ms internally-timed integration periods. The oscillator frequency is dependent upon an external resistor, Rext, and can be adjusted by selecting a different resistor value. The resolution and maximum range of the device are also affected by changes in Rext; see below. The oscillator frequency can be calculated with the following equation:
100k f osc = 327.6kHz ----------------R ext
34H
38H
1xxx_xxxxB
Data Registers
The ISL29001 contains four 8-bit data registers. These registers cannot be specifically addressed, as is conventional with other I2C peripherals; instead, performing a read operation on the device always returns all available registers in ascending order. See Table 2 for a description of each register.
TABLE 2. ADDRESS 00H 01H 02H 03H CONTENTS Least-significant byte of most recent sensor reading. Most-significant byte of most recent sensor reading. Least-significant byte of integration counter value corresponding to most recent sensor reading. Most-significant byte of integration counter value corresponding to most recent sensor reading.
Rext is nominally 100k, and provides 100 millisecond internal timing and a 1-10,000 lux range for Diode 1. Doubling this resistor value to 200k halves the internal oscillator frequency, providing 200ms internal timing. In addition, the maximum lux range of Diode 1 is also halved, from 10,000 lux to 5,000 lux, and the resolution is doubled, from 3.3 counts per lux to 6.6 counts per lux. The acceptable range of this resistor is 50k (providing 50ms internal timing, 100,000 lux maximum reading, ~1.6 counts per lux) to 500k (500ms internal timing, 2,000 lux maximum reading, ~16 counts per lux). When using one of the three internal timing modes, the ISL29001's resolution is determined by the ratio of the max lux range to 32,768, the number of clock cycles per integration.
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ISL29001
The following equations describe the light intensity as a function of the sensor reading, and the integration time as a function of the external resistor.
10, 000lux 1 L = --------------- -------------------------------------- Data1 32768 ( R ext 100k )
longer fixed at 32,768, but varies with the chosen integration time. The number of clock cycles in the previous integration period is provided in the third and fourth bytes of data read across the I2C bus. This two-byte value is called the integration counter value. When using one of the three external timing modes, the ISL29001's resolution varies with the integration time. The resolution is determined by the ratio of the max lux range to the number of clock cycles per integration. The following equations describe the light intensity as a function of sensor reading, integration counter value, and integration time:
10, 000lux Data1 L = --------------------------------------- ----------------( R ext 100k ) Data2 T = Time Interval between external time commands
R ext T = 100ms ----------------100k
where L is the measured light intensity, Data1 is the sensor reading, T is the integration time, and Rext is external resistor value.
External Timing
When using one of the three external timing modes, each integration period of the ISL29001 is determined by the time which passes between consecutive external timing commands received over the I2C bus. The internal oscillator operates identically in both the internal and external timing modes, with the same dependence on Rext. However, when using one of the three external timing modes, the number of clock cycles per integration is no
where L is the measured light intensity, Data1 is the sensor reading, Data2 is the integration counter value, T is the integration time, and Rext is external resistor value.
Typical Circuit
A typical application circuit is shown in Figure 12.
MICROCONTROLLER ISL29002 2.53.3V VDD + 4.7F 0.1F VSS PD REXT SDA SCL SDA SCL
100k
FIGURE 12. TYPICAL CIRCUIT
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ISL29001
Suggested PCB Footprint
See Figure 13. Footprint pads should be a nominal 1-to-1 correspondence with package pads. The large, exposed central die-mounting paddle in the center of the package requires neither thermal nor electrical connection to the PCB, and such connection should be avoided.
0.65
0.3
0.65 2.05 All dimensions in millimeters.
FIGURE 13. SUGGESTED PCB FOOTPRINT
Layout Considerations
The ISL29001 is relatively insensitive to layout. Like other I2C devices, it is intended to provide excellent performance even in significantly noisy environments. There are only a few considerations that will ensure best performance. Route the supply and I2C traces as far as possible from all sources of noise. Use two power-supply decoupling capacitors, 4.7F and 0.1F, placed close to the device.
Soldering Considerations
Convection heating is recommended for reflow soldering; direct-infrared heating is not recommended. The ISL29001's plastic ODFN package does not require a custom reflow soldering profile, and is qualified to 260C. A standard reflow soldering profile with a 260C maximum is recommended.
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ISL29001 ODFN Package Outline Drawing
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ISL29001
All Intersil U.S. products are manufactured, assembled and tested utilizing ISO9000 quality systems. Intersil Corporation's quality certifications can be viewed at www.intersil.com/design/quality
Intersil products are sold by description only. Intersil Corporation reserves the right to make changes in circuit design, software and/or specifications at any time without notice. Accordingly, the reader is cautioned to verify that data sheets are current before placing orders. Information furnished by Intersil is believed to be accurate and reliable. However, no responsibility is assumed by Intersil or its subsidiaries for its use; nor for any infringements of patents or other rights of third parties which may result from its use. No license is granted by implication or otherwise under any patent or patent rights of Intersil or its subsidiaries.
For information regarding Intersil Corporation and its products, see www.intersil.com 10
FN6166.0 December 21, 2005

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