ISL29035

Integrated Digital Light Sensor with Interrupt

OVERVIEW

The ISL29035 is an integrated ambient and infrared light-to-digital converter with I2 C (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 adjustable 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 I2 C interface. The power consumption can be reduced to less than 0.3μA when powered down.

The ISL29035 supports a software brownout condition detection. The device powers up with the brownout bit asserted until the host clears it through the I2 C interface.

The ISL29035 supports a software and hardware interrupt that remains asserted until the host clears it through the I2 C interface. Function of ADC conversion continues without stopping after interrupt is asserted.

Designed to operate on supplies from 2.25V to 3.63V with an I2 C supply from 1.7V to 3.63V, the ISL29035 is specified for operation across the -40°C to +85°C ambient temperature range.

KEY FEATURES

  • Resolution: 16-bit ADC
  • Wide dynamic range: 1:4,200,000
  • Integrated noise reduction: 50/60Hz
  • Close to human eye response with excellent IR/UV rejection
  • Shutdown modes: software and automatic
  • Programmable interrupt threshold with persistence filter
  • 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: 6 Ld 1.5x1.6x0.75 ODFN

BLOCK DIAGRAM

 Block Diagram

PARAMETRICS

Parameters
ISL29035
Production Status
Mass Production(*)
Peak Spectral Sensitivity
550 nm
VS (min)
2.25 V
VS (max)
3.63 V
ICC
57
Resolution Bits
16
Lux Range (min) (lux)
0.015
Lux Range (max) (lux)
64000
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?
No
Package Dimensions (mm)
1.5X1.6X0.75
Features
ALS interrupt
Enable Pin?
Software Enabled
Can Sample
YES
Temperature Range
-40 to +85

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