ISL29112

Low Power, <100 Lux Optimized, Analog Output Ambient Light Sensor

Product Status: Mass Production

OVERVIEW

The ISL29112 is a low cost, light-to-voltage silicon optical sensor combining a photodiode array, a non-linear current amplifier, and a micropower op amp on a single monolithic IC. Similar to the human eye, the photodiode array has peak sensitivity at 550nm and spans the wavelength range 400nm to 600nm, rejecting UV and IR light. The input luminance range is from 0.01 lux to 100 lux.

The integrated non-linear current amplifier boosts and converts the photodiode signal into a square root output format, extending dynamic range while maintaining excellent sensitivity in dimly lit conditions. As such, the part is ideal for measuring incident daylight when mounted behind heavily smoked bezels used around displays or behind mirrors.

The device consumes minimum power. A dark current compensation circuit minimizes the effect of temperature dependent leakage currents in the absence of light, improving the light sensitivity at low lux levels. The output gain has been optimized to require a relatively low value external bias resistor that falls within recommended automotive EMI limits. The built-in 1μA op amp gives the ISL29112 an output voltage driving advantage for heavier loads that can drive an ADC directly.

The ISL29112 is housed in an ultra compact 2mmx2.1mm ODFN plastic surface mount package. Operation is rated from -40°C to +85°C.

KEY FEATURES

  • Square root voltage output
  • 0.01 lux to 100 lux range
  • 1.8V to 3V supply range
  • Close to human eye spectral response
  • Fast response time
  • Internal temperature compensation
  • Good IR rejection
  • Low supply current
  • Operating temperature range -40°C to +85°C
  • 6 Ld ODFN: 2mmx2.1mmx0.7mm
  • Pb-free (RoHS compliant)

BLOCK DIAGRAM

 Block Diagram

PARAMETRICS

Parameters
ISL29112
Basic Information
生产状态
Mass Production
峰值光谱灵敏度
550 nm
VS (最小值)
1.8 V
VS (最大值)
3.0 V
供电电流 @ EV =100Lux
23 µA
照度范围 (最大值) (lux)
100
输出电压@ EV=100Lux
1.85 V
暗电压 @ EV=0Lux
.95 mV
上升时间
95 µs
下降时间
155 µs
资质级别
Standard
延迟时间,上升沿 (μs)
350 @ 100Lux
延迟时间,下降沿 (μs)
250 @ 100Lux
封装尺寸 (mm)
2x2.1x0.7
无铅?
Yes
启用引脚?
Yes
温度范围
-40 to +85

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