AS7331 datasheet(5/72 Pages) OSRAM

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AS7331

General Description

Datasheet

• PUBLIC

DS001047

• v4-00 • 2023-Mar-24

│ 4

1.1

Key Benefits and Features

The benefits and features of AS7331, Spectral UVA/B/C Sensor are listed below:

Figure 1:

Added Value of Using AS7331

Benefits

Features

Separated UVA, UVB and UVC radiation

measurements

Three separated UV detectors with interference filter

technology

UV-radiation measurements from low to

high radiation conditions

High dynamic range up to

3.43E+10 (16…24-Bit ADC)

Usable for fluorescence light conditions

High sensitivity up to 421 counts/(µW/cm²) in UVA,

Smallest LSB 2.38 nW/cm² (at 64 ms integration time).

Up to four AS7331 sensors on the same

I²C bus in parallel

Adjustable I²C addresses

Mobile applications

Low-power operation, Power-on Reset, Power-down

and standby, small OLGA package

Temperature compensation of

measurement results

Integrated temperature sensor

1.2

Applications

●

UV-Disinfection (water, air, surfaces)

●

UV-Curing

●

Phototherapy

●

Analytics

●

Home Appliances

●

Horticulture

1.3

Block Diagram

Figure 2 shows the main components of the AS7331. The photodiodes convert the incoming radiation

to a photocurrent and with a subsequent current-to-digital converter to digital data. An internal

reference generator provides all the necessary references for the A/D conversion and the photodiodes

by using an external resistor REXT at pin REXT. The results of the A/D conversion are stored in three

16-bit registers and can be accessed via the I²C interface. For the externally triggered start or start

and stop of the measurement, the input pin SYN can be used. The output READY reflects the status

of the conversion. The internal temperature sensor delivers the on-chip temperature, stored as a 12-bit

value in a 16-bit register, which can be accessed via the I²C interface as well. The pins A0 and A1 set

the I²C slave address. Separated analog and digital power supply and ground pins reduce noise

coupling.

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