AS7265X datasheet(20/64 Pages) OSRAM

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[v1-04] 2018-Jul-09

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AS7265x − Detailed Description

AS7265x 18-Channel Spectral_ID Detector

Overview

Each of the three AS7265x Spectral_ID devices are next-gener-

ation digital 6-channel spectral sensor devices. Each of the 6

channels has a Gaussian filter characteristic with a full width

half maximum (FWHM) bandwidth of 20nm. The filters use an

interference topology design providing high stability in terms

of drift in time and temperature. The drifts are so small that it

is undetectable in the measurement. The temperature drift of

the device is largely determined by the drift of the sensor and

the electronics. To compensate for the temperature drift in the

application, every device of the AS7265x chipset includes an

integrated temperature sensor.

Filter accuracy will be affected by the angle of incidence which

itself is limited by integrated aperture and internal micro-lens

structure. The aperture-limited average field of view is ±20.5°

to deliver specified accuracy. All optical characteristics are

optimized for using diffused light.

Each device contains an analog-to-digital converter (16-bit res-

olution ADC) which integrates the current from each channel’s

photodiode. Upon completion of the conversion cycle, the in-

tegrated result is transferred to the corresponding data regis-

ters. The transfers are double-buffered to ensure data integrity

is maintained.

The external MCU interface control via I²C registers or AT com-

mands, transparently controls the AS72652 and/or AS72653.

A serial flash is a required operating companion for this device

and enables factory calibration/normalization of the filters.

Supported device types are noted in

Ordering & Contact Information at the end of this document.

Required operating code can be downloaded at

download.ams.com.

Channel Data Conversion of the AS7265x

Devices

All three of these 6 channel devices use conversion implement-

ed via two photodiode banks in each device. Refer to

Figure 21and Figure 22. Bank 1 consists of register data from 4

of the 6 photodiodes, with 2 registers zeroed and Bank 2 con-

sists of data from a different set of 4 of the 6 photodiodes, with

2 different registers zeroed. Spectral conversion requires the

integration time (IT in ms) set to complete. If both photodiode

banks are required to complete the conversion, the 2nd bank

requires an additional IT ms. Minimum IT for a single bank con-

version is 2.8 ms. If data is required from all 6 photodiodes then

the device must perform 2 full conversions (2 x Integration

Time).

Detailed Description

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