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AS7421

Device and System Calibration

Datasheet

• PUBLIC

DS000667

• v2-00 • 2022-Oct-13

│ 21

Device and System Calibration

AS7421 is a fully integrated spectrometer, including sensor array, light sources, optics, Fabry-Perot

interference filter, cover glass, light guide, all integrated into a single package. Factors such as

temperature drift of the LEDs, wavelength shift of the filters but also system related influences such as

optical stack-up of the final application influence the measurement results and therefore need to be

calibrated to provide accurate and repeatable spectral measurements.

Typically a calibration consist of 2 stages, stage 1 is Device Calibration. ams OSRAM is providing a

device calibration file for each individual device which is linked to its unique device ID. This Device

Calibration file is needed for final System Calibration and can be used by our provided “Calibration

Library”.

System Calibration is done to compensate influences which are caused by final system optical stack

up implementation, such as cross talk from cover glasses or influences from external diffusers within

the optical stack-up. The System Calibration file (stage 2) is generated by use of our Calibration

Library.

Figure 19:

Calibration Stages

Calibration Stage

Addressed Items

Comment

Device Calibration

(Stage 1 Calibration)

Sensor Array (responsivity)

Device Calibration file is provided

by ams OSRAM for each individual

AS7421 device.

Light Sources (SPD)

Temperature Drift of PDs

Filter Performance (PWL)

System Calibration

(Stage 2 Calibration)

Optical stack of final application

such as cover glasses, system

optics…

In order to generate a system

calibration file the Device

Calibration file and the calibration

library are needed.

ams OSRAM is providing the following supporting tools to enable system calibration at customer

applications.

Figure 20:

Supporting Tools (SW and Calibration)

Supporting Tools

Function

Version

AS7421 Calibration Library

Provides APIs for system calibration.

1.4.0

Calibration Library API Documentation

Documentation of available APIs.

1.4.0

AS7421 Chip Library

Provide low level access to AS7421

configuration.

4.0.0

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