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PDF ISL29034 Data sheet ( Hoja de datos )
| Número de pieza | ISL29034 | |
| Descripción | Integrated Digital Light Sensor | |
| Fabricantes | Intersil | |
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DATASHEET
Integrated Digital Light Sensor
ISL29034
The ISL29034 is an integrated ambient and infrared
light-to-digital converter with I2C (SMBus compatible) interface. Its
advanced self-calibrated photodiode array emulates human eye
response with excellent IR rejection. The on-chip ADC is capable
of rejecting 50Hz and 60Hz flicker caused by artificial light
sources. The Lux range select feature allows users to program the
Lux range for optimized counts/Lux.
For ambient light sensing, an internal 16-bit ADC has been
designed based upon the charge-balancing technique. The
ADC conversion time is nominally 105ms and is user
selectable from 11µs to 105ms, depending on oscillator
frequency and ADC resolution. In normal operation, typical
current consumption is 57µA. In order to further minimize
power consumption, two power-down modes have been
provided. If polling is chosen over continuous measurement of
light, the auto power-down function shuts down the whole chip
after each ADC conversion for the measurement. The other
power-down mode is controlled by software via the I2C
interface. The power consumption can be reduced to less than
0.3µA when powered down.
The ISL29034 supports a software brownout condition
detection. The device powers up with the brownout bit asserted
until the host clears it through the I2C interface. Designed to
operate on supplies from 2.25V to 3.63V with an I2C supply from
1.7V to 3.63V, the ISL29034 is specified for operation across the
-40°C to +85°C ambient temperature range.
Features
• Resolution . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16-bit ADC
• Wide dynamic range1: . . . . . . . . . . . . . . . . . . . . . . . . . . 4,200,000
• Integrated noise reduction . . . . . . . . . . . . . . . . . . . . . 50/60Hz
• Close to human eye response with excellent IR/UV rejection
• Shutdown modes. . . . . . . . . . . . . . . . . . . .software and automatic
• Supply current (typical) . . . . . . . . . . . . . . . . . . . . . . . . . . . 57µA
• Shutdown current (maximum) . . . . . . . . . . . . . . . . . . . 0.51µA
• I2C (SMB compatible) power supply . . . . . . . . . 1.7V to 3.63V
• Sensor power supply . . . . . . . . . . . . . . . . . . . . . 2.25V to 3.63V
• Operating temperature range. . . . . . . . . . . . . -40°C to +85°C
• Small form factor package . . . . . . . 4 Ld 1.5x1.3x0.75 ODFN
Applications
• Mobile devices: smart phone, PDA, GPS
• Computing devices: notebook PC, MacBook, tablets
• Consumer devices: LCD-TV, digital picture frame, digital camera
• Industrial and medical light sensing
Related Literature
• AN1591, “Evaluation Hardware/Software Manual for ALS
and Proximity Sensor”
TABLE 1. KEY DIFFERENCES BETWEEN FAMILY OF PARTS
PART NUMBER
ISL29034
ISL29035
ALS SENSING INTERRUPT PIN
Yes No
Yes Yes
NUMBER OF
PINS
4 Ld
6 Ld
VDD_PULLUP
4.7k
SDA
MCU
SCL
100
VDD
1µF
4.7k 1
VDD
4 SDA
ISL29034
3 SCL
GND
2
FIGURE 1. ISL29034 TYPICAL APPLICATION DIAGRAM
1.2
1.0
HUMAN EYE
0.8
AMBIENT LIGHT SENSOR
0.6
0.4
0.2
0
300 400 500 600 700 800 900 1000 1100
WAVELENGTH (nm)
FIGURE 2. NORMALIZED SPECTRAL RESPONSE FOR AMBIENT
LIGHT SENSING
August 19, 2016
FN8370.2
1
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
1-888-INTERSIL or 1-888-468-3774 | Copyright Intersil Americas LLC 2013, 2014, 2016. All Rights Reserved
Intersil (and design) is a trademark owned by Intersil Corporation or one of its subsidiaries.
All other trademarks mentioned are the property of their respective owners.
1 page  
SDA vs SCL Timing
SCL
tSU:STA
SDA
(INPUT TIMING)
tF
tSU:DAT
tHD:STA
ISL29034
tHIGH
tLOW
tHD:DAT
SDA
(OUTPUT TIMING)
FIGURE 4. I2C BUS TIMING
tR
tAA tDH
tHD:STO
tSU:STO
tBUF
SCL
SDA
8TH BIT OF LAST BYTE
ACK
STOP
CONDITION
tWC
FIGURE 5. I2C WRITE CYCLE TIMING
START
CONDITION
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FN8370.2
August 19, 2016
5 Page 
ISL29034
RESERVED BITS [B2:B0] AND [B6]
All RESERVED bits on the ISL29034 are Intersil used bits only.
Bit0 to Bit2 and Bit6 are RESERVED bits where their value might
change without any notification to the user. It is advised when
using the identification bits to identify the device in a syste, the
software should mask the Bit0 to Bit2 and Bit6 to Bit7 to properly
identify the device.
DEVICE ID BITS [B5:B3]
The ISL29034 provides 3 bits to identify the device in a system.
These bits are located on register address 0x0F, Bit3 to Bit5. The
identification bit value for the ISL29034 is xx101xxx. The device
identification bits are read only bits. It is important to notice that
Bit7 is a status bit for Brownout Condition (BOUT).
BROWNOUT STATUS BIT TO BOUT [B7]
Bit7 on register address 0x0F is a status bit for Brownout
Condition (BOUT). The default value of this bit is “BOUT = 1”
during the initial power-up, which indicates the device may
possibly have gone through a brownout condition. Therefore, the
status bit should be reset to “BOUT = 0” by an I2C write command
during the initial configuration of the device.
The default register value is 0xA8 at power-on.
Applications Information
Figure 15 is a normalized spectral response of various types of
light sources for reference.
1.0
0.9 FLUORESCENT
0.8
0.7
0.6
0.5 HALOGEN INCAND.
0.4 SUN
0.3
0.2
0.1
0
350 550 750 950
WAVELENGTH (nm)
FIGURE 15. NORMALIZED SPECTRAL RESPONSE OF LIGHT SOURCES
Calculating Lux
The ISL29034’s ADC output codes, DATA, are directly
proportional to Lux in the ambient light sensing.
Ecal = DATA
(EQ. 1)
Where Ecal is the calculated Lux reading. The constant is
determined by the full-scale range and the ADC’s maximum
output counts. The constant is independent of the light sources
(fluorescent, incandescent and sunlight) because the light
sources IR component is removed during the light signal process.
The constant can also be viewed as the sensitivity (the smallest
Lux measurement the device can measure).
= -C----Ro----u-a---n-n---t-g-m--e--a----x-
(EQ. 2)
Where, Range is defined in Table 7 on page 10. Countmax is the
maximum output counts from the ADC.
The transfer function used for n-bits ADC becomes:
Ecal = R-----a--2--n--n--g----e- DATA
(EQ. 3)
Where n = 4, 8, 12 or 16. This is the number of ADC bits
programmed in the command register. 2n represents the
maximum number of counts possible from the ADC output. Data is
the ADC output stored in the data registers (02 hex and 03 hex).
Enhancing EV Accuracy
The device has on-chip passive optical filter designed to block
(reject) most of the incident Infra Red. However, EV
measurement may be vary under differing IR-content light
sources. In order to optimize the measurement variation
between differing IR-content light sources, ISL29034 provides IR
channel, which is programmed at COMMAND-1 (Reg0x0) to
measure the IR level of differing IR-content light sources.
The ISL29034’s ADC output codes, DATA, are directly
proportional to the IR intensity received in the IR sensing.
DATAIR = EIR
(EQ. 4)
Then EV accuracy can be found in Equation 5:
EVAccuracy = KxDATAEV + DATAIR
(EQ. 5)
Here, DATAEV is the received ambient light intensity ADC output
codes. K is a resolution of visible portion. Its unit is Lux/count.
The typical value of K is 0.82. DATAIR is the received IR intensity.
The constant changes with the spectrum of background IR,
such as A, F2 and D65 (Notes 8, 9 and 10). The also changes
with the ADC’s range and resolution selections. A typical for
Range1 and Range2 is -11292.86 and Range3 and Range4 is
2137.14 without IR tinted glass.
Noise Rejection
Electrical AC power worldwide is distributed at either 50Hz or
60Hz. Artificial light sources vary in intensity at the AC power
frequencies. The undesired interference frequencies are infused
on the electrical signals. This variation is one of the main sources
of noise for the light sensors. Integrating type ADC’s have
excellent noise-rejection characteristics for periodic noise
sources whose frequency is an integer multiple of the conversion
rate. By setting the sensor’s integration time to an integer
multiple of periodic noise signal, the performance of an ambient
light sensor can be improved greatly in the presence of noise. In
order to reject the AC noise, the integration time of the sensor
must to adjusted to match the AC noise cycle. For instance, a
60Hz AC unwanted signal’s sum from 0ms to k*16.66ms
(k = 1,2...ki) is zero. Similarly, setting the device’s integration
time to be an integer multiple of the periodic noise signal, greatly
improves the light sensor output signal in the presence of noise.
Submit Document Feedback 11
FN8370.2
August 19, 2016
11 Page | ||
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| PDF Descargar | [ Datasheet ISL29034.PDF ] | |
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