ams AS7331 Spectral UV Sensor

Description

The AS7331 is a low-power, low noise integrated UV sensor. The three separated UVA, UVB and UVC channels convert optical radiation signals via UV optimized photodiodes to a digital result and realize a continuous or triggered measurement. The irradiance responsivity can be adjusted via Gain, conversion time and internal clock frequency to effect sensitivity, full scale range and LSB. The by the AS7331 detected amount of radiation in the set Gain and conversion time configuration will be provided as digital counts by the AS7331. The AS7331 offers a range of 12 Gain steps by a factor of two for each step. The conversion time is internally controlled over a wide range of 15 steps by a factor of two for each step. With the input pin (SYN), the conversion time can be externally controlled to adapt the measurement to the given environment and time base.
With its irradiance responsivity factor and conversion time, the AS7331 supports an overall huge dynamic range up to 3.43E+10 (resolution multiplied by gain range). It achieves an accuracy of up to 24-bit signal resolution (internal via I²C and shifter 16-bit), with an irradiance responsivity per count down to 2.38 nW/cm² at 64 ms integration time. Via an integrated divider, the 16-bit I²C output can be adjusted to the significant bits of interest.

Replacement Products

ams TSL2585 light sensor with UVA detection

TSL2585 is a mini size ambient light sensor with UVA and light flicker detection, comes in a very low-profile and small footprint L2.0mm x W1.0mm x H0.35mm 6-pin OLGA package, perfectly fits wearable and mobile phone applications which are usually very space and height constrained.The high sensitivity enables the device to work behind a low transmissivity covering glass providing an accurate ALS detection. In addition, TSL2585 has a special edge-located photodiode placement which allows for a narrow bezel design down to 0.4mm width when the device is placed very close to the product edge. Fulfilling requirements of today's industrial design of designing bezel-less products for a good looking appearance.

ams TCS3448 Spectral Color Sensor

The TCS3448 is a 14-channel highly versatile, multi-purpose spectral light sensor. It is optimized to sense spectral components of ambient light in the visible range. Such spectral information is used for camera enhancement (CCT, AWB, exposure time). The spectral response is defined by individual channels covering approximately 380 nm to 1000 nm with 11 channels centered in the visible spectrum (VIS), plus one near-infrared (NIR) and a clear channel. Applications can be assisted to allow classification of ambient light and an integrated flicker detection channel that can automatically flag ambient light flicker at 50/60 Hz as well as buffer data for externally calculating other flicker frequencies. TCS3448 integrates high-precision optical interference filters directly deposited on photodiodes which are embedded in CMOS silicon. A built-in aperture controls the light entering the sensor array to increase accuracy. A programmable digital GPIO and LED driver enable light source and trigger/sync control. Device control and spectral data access is implemented through a serial I²C 1.2 V/1.8 V interface. The device is available in an ultra-low profile package with dimensions of 3.1 mm x 2 mm x 1 mm.

Details

Features

  • Interference filter technology
  • 3 channel UVA/B/C sensing
  • High dynamic range, adjustable to the application conditions
  • Class leading sensitivity
  • Broad conversion range
  • Extended temperature range

Benefits

  • No filter aging or drifts over lifetime and temperature
  • Separated UVA/B/C radiation detection incl. daylight (VIS+NIR) blocking
  • Sensor settings adjustable from low to bright radiation conditions
  • Fast or high accurate radiation and fluorescence detection possible
  • Usability in harsh environments

Parameters

Function
spectral sensing
Supply voltage
3.3 V
min.
2.7 V
max.
3.6 V
Interface
input
I²C slave (400kHz)
output
I²C slave (400kHz)
Operating ambient temperature
min.
-40 °C
max.
85 °C
Integrated diffuser
No
Package
OLGA
Package dimension
l
3.65 mm
w
2.6 mm
h
1.09 mm
Input/Output Voltage
VDD

Ordering codes

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