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AS7421

General Description

Datasheet

• PUBLIC

DS000667

• v2-00 • 2022-Oct-13

│ 3

General Description

AS7421 is a 64-channel near infrared digital spectrometer for spectral identification and spectral

footprint analysis used in consumer devices. The spectral response of the sensor is defined in the

wavelengths from approximately 750 nm to 1050 nm and the channels are equally distributed over the

mentioned range. Once a spectral measurement is started, all 64 channels are processed

automatically by 16 parallel sampling ADCs with four consecutive integration cycles.

AS7421 integrates Fabry-Perot filters into standard CMOS silicon via nano-optic deposited

interference filter technology and its package provides a built in aperture and micro optics to control

the light entering the sensor array. In addition, the module provides a near infrared (NIR) light source

and an integrated LED driver to control it.

Control and spectral data access is implemented through a serial I²C interface. A GPIO and an

interrupt signal are available to start/synchronize the spectral measurement as well as minimize I²C

traffic.

1.1

Key Benefits & Features

The benefits and features of AS7421, 64-Channel Hyperspectral NIR Sensor, are listed below:

Figure 1:

Added Value of Using AS7421

Benefits

Features

Miniaturized reflectance/absorbance spectral

analysis and material identification in NIR range

61 individual and 4 special purpose spectral

channels with a FWHM of typical 10 nm

16-bit full scale resolution per spectral channel

Fast measurement time

16 parallel sampling ADCs with individual gain

settings

256 ms to obtain measurement data for all 64

channels

High module integration and low BOM

Integrated 64-channel sensor with on-chip

Fabry-Perot filters

Integrated NIR light source (LED) to cover

750 - 1050 nm range

Integrated programmable LED driver

Integrated optics to limit AOI on sensor

Low power consumption and minimum I²C traffic

3.3 V VDD operation

Configurable sleep mode

Interrupt-driven device

Synchronization of spectral measurement

Configurable GPIO to trigger/sync spectral

measurements

AS7421 数据表(PDF) 4 Page - OSRAM GmbH

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