ISL29020

A Low Power, High Sensitivity, Light-to Digital Sensor With I<sup>2</sup>C Interface

Product Status: Mass Production(*)

OVERVIEW

The ISL29020 is a low power, high sensitivity, integrated light sensor with I2 C (SMBus Compatible) interface. Its state-of-the-art photodiode array provides close-to human eye response and good IR rejection. This ADC is capable of rejecting 50Hz and 60Hz flicker caused by artificial light sources. The lux range select feature allows the user to program the lux range for optimized counts/lux.

In normal operation, typical power consumption 55µA. 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 I2 C interface. The power consumption can be reduced to less than 1µA when powered down.

Designed to operate on supplies from 2.25V to 3.3V with I2 C supply from 1.7V to 3.6V, the ISL29020 is specified for operation over the -40°C to +85°C ambient temperature range.

KEY FEATURES

  • Low Power
  • 65µA Max Operating Current
  • 0.5µA Max Shutdown Current
  • Software Shutdown and Automatic Shutdown
  • Ideal Spectral Response
  • Close to Human Eye Response
  • Excellent IR and UV Rejection
  • Easy to Use
  • Simple Output Code Directly Proportional to lux
  • I2C (SMBus Compatible) Output
  • No Complex Algorithms Needed
  • Variable Conversion Resolution up to 16-bits
  • Adjustable Sensitivity up to 65 Counts per lux
  • Works Under Various Light Sources, Including Sunlight
  • Selectable Range (via I2C)
  • Range 1 = 0.015 lux to 1,000 lux
  • Range 2 = 0.06 lux to 4,000 lux
  • Range 3 = 0.24 lux to 16,000 lux
  • Range 4 = 0.96 lux to 64,000 lux
  • Temperature Compensated
  • Integrated 50/60Hz Noise Rejection
  • Small Form Factor
  • 2.0mmx2.1mmx0.7mm 6 Ld ODFN Package
  • Additional Features
  • I2C and SMBus Compatible
  • 1.7V to 3.6V Supply for I2C Interface
  • 2.25V to 3.3V Supply
  • Address Selection Pin
  • Pb-Free (RoHS compliant)

BLOCK DIAGRAM

 Block Diagram

PARAMETRICS

Parameters
ISL29020
Basic Information
Production Status
Mass Production(*)
Peak Spectral Sensitivity
540 nm
VS (min)
2.25 V
VS (max)
3.3 V
ICC
55
Resolution Bits
16
Lux Range (min) (lux)
0.015
Lux Range (max) (lux)
65535
Counts/Lux (max) (Counts)
65
Dark ADC Code @ Ev=0Lux (max) (Counts)
5
Gain Selection?
Yes
Qualification Level
Standard
Bus/Output Interface
I2C
Address Selection Pins?
Yes
Package Dimensions (mm)
2.0x2.1x0.70
Features
ALS interrupt
Enable Pin?
Software Enabled
Temperature Range
-40 to +85

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