General 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 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.
Applications
UV-Disinfection (water, air, surfaces)
UV-Curing
Phototherapy
Analytics
Home Appliances
Horticulture