ISL29034_14 Datasheet, PDF (1/15 Pages) Intersil Corporation – Integrated Digital Light Sensor

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
over the -40°C to +85°C ambient temperature range.
Features
• Resolution . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .16-bits 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 (typ) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57µA
• Shutdown current (max) . . . . . . . . . . . . . . . . . . . . . . . . 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”
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
AMBIENT LIGHT SENSOR
0.8
HUMAN EYE (PHOTOPIC)
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
April 9, 2014
1
FN8370.1
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
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