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AS7421

Functional Description

Datasheet

• PUBLIC

DS000667

• v2-00 • 2022-Oct-13

│ 18

7.2

Sensor Array

The device features an 8 x 8-photodiode array

– each photo diode has its own filter with a dedicated

response. The pitch between each photo-diode is 200 µm. Four photodiodes (corner) share the same

wavelength response.

Figure 14:

Photodiode Array

7.3

SMUX Configuration

The device integrates a multiplexer (SMUX). With the SMUX, it is possible to map all available photo

diodes to one of four pre-defined ADCs. In total sixteen ADCs are available for data processing. After

power up of the device the SMUX needs to be configured and the configuration data is stored in the

RAM. ams OSRAM provides reference codes and an application note on how to configure the SMUX.

7.4

ADC Gain Configuration

The gain of each modulator (ADC) can be adjusted individually. Eight configuration steps are

available, from AGAIN “0” (gain factor 1x) to AGAIN “8” which equals a gain ration of 256x.

ams OSRAM provides reference codes and an application note on how to configure the AGAIN values

of AS7421.

830

750

790

870

760

800

840

880

770

810

850

890

780

820

860

900

775

815

855

895

765

805

845

885

755

795

835

875

830

785

825

865

940

980

1020

830

930

970

1010

1050

920

960

1000

1040

910

950

990

1030

905

945

985

1025

915

955

995

1035

925

965

1005

1045

935

975

1015

830

1600µm

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