ISL29034 Datasheet, PDF (1/14 Pages) Intersil Corporation – Wide dynamic range1

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
ALS SENSING INTERRUPT PIN
Yes
No
NUMBER OF
PINS
4 Ld
ISL29035
Yes
Yes
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
1
FN8370.2
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
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