AS7261 datasheet(14/48 Pages) OSRAM

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[v1-00] 2016-Dec-30

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AS7261 − Detailed Descriptions

Data Conversion Description

AS7261 Spectral Conversion is implemented via two

photodiode banks. The First Bank, Bank1 consists of data from

the X, Y, Z and NIR (near-IR) photodiodes. Bank2 provides data

from the same X and Y photodiodes as well as the D (dark) and

C (Clear) photodiodes. 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

conversion is 2.8 ms. If data is required from all 6 photodiodes

then the device must perform 2 full conversions (2 x Integration

Time).

The spectral conversion process is controlled with four BANK

Mode settings as follows:

BANK Mode 0:

Conversions will occur continuously and data will be available

in I²C registers X, Y, Z, and NIR or via the ATDATA command when

using the UART device interface.

BANK Mode 1:

Conversions will occur continuously and data will be available

in I²C registers X, Y, D, and C or via the ATDATA command.

BANK Mode 2:

Conversions occur continuously and data will be available in

registers X, Y, Z, NIR, D and C or via the ATDATA command after

two integration periods. In this Mode 2 the calibrated, corrected

values may also be obtained from the appropriate I²C registers

or using the ATXYZC command.

When the bank setting is Mode 0, Mode 1, or Mode 2, the

spectral data conversion process operates continuously, with

new data available after each IT ms period. In the continuous

modes, care should be taken to assure prompt interrupt

servicing so that integration values from both banks are all

derived from the same spectral conversion cycle.

BANK Mode 3:

Data will be available in registers X, Y, Z, NIR, D and C in One-Shot

mode. And in this Mode 3 the calibrated, corrected values may

also be obtained from the appropriate I²C registers or using the

ATXYZC command.

When the bank setting is set to Mode 3 the device initiates

One-Shot operation. The DATA_RDY bit is set to 1 once data is

available, indicating spectral conversion is complete. One-Shot

mode is intended for use when it is critical to ensure spectral

conversion results are obtained contemporaneously.

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