ISL29147

Low Power Ambient Light and Proximity Sensor with Enhanced Infrared Rejection

Product Status: Mass Production

OVERVIEW

The ISL29147 is a low power Ambient Light Sensor (ALS) and proximity (PROX) sensor. It has a built-in IR-LED for the proximity function. The ALS function measures the amount of light (in the visible spectrum) incident on the ISL29147.

The ALS function has a programmable ambient IR-rejection, which allows fine tuning of light source variations and is ideal for light sensor applications under dark protective glass. The ALS provides a 12-bit measurement. A passive optical filter removes unwanted wavelengths (IR or Ultraviolet) to ensure accurate ALS measurement.

The proximity function includes a new offset adjustment to compensate for the IR light reflected off the inside of the protective glass cover and back to the ISL29147 sensor. This offset adjustment allows the sensor to compensate for these internal reflections and preserve the dynamic range of the proximity measurement.

The built-in current-driver pulses an external infrared LED at a programmed current for 90µs. The infrared light that is reflected and received by the ISL29147 is digitized by an 8-bit ADC. The proximity sensor also has a passive optical filter designed to pass IR and reject visible wavelengths.

The ISL29147 provides a hardware pin to indicate an interrupt event. The interrupt pin saves power as the host microcontroller can ‘wake-up’ on an interrupt event and does not need to poll the device for an interrupt event. The interrupt generator is user configurable and provides several options for ALS and PROX trigger configurations. The ISL29147 supports an SMBus compatible I2 C interface for configuration and control.

KEY FEATURES

  • Internal IR-LED and sensor for a complete solution
  • Ideal for applications under dark or tinted glass
  • Enhanced ambient sunlight rejection to 40k Lux
  • Programmable proximity sleep time between proximity measurements optimizes power consumption
  • Hardware interrupt - no polling required
  • Programmable IR compensation to fine-tune ALS performance for various glass compositions
  • Programmable IR LED drive current to 250mA
  • Operates from 2.25V to 3.63V VDD
  • Power-down IDD, typical 0.2µADC
  • Tiny 2.40x4x1.2 (mm) optical co-package

BLOCK DIAGRAM

 Block Diagram

PARAMETRICS

Parameters
ISL29147
Basic Information
生产状态
Mass Production
峰值光谱灵敏度
575 nm
VS (最小值)
2.25 V
VS (最大值)
3.63 V
ICC
95
分辨率位
12
照度范围 (最小值) (lux)
56.25
照度范围 (最大值) (lux)
1800
计数/Lux (最大值) (计数)
72.8
暗ADC代码@ Ev=0Lux (最大值) (计数)
1
增益选择?
No
资质级别
Standard
总线/输出接口
I2C
地址选择引脚?
No
封装尺寸 (mm)
2.40x4x1.2
特性
Enhanced IR Rejection
启用引脚?
Software Enabled
温度范围
-40 to +85

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