AS7262 datasheet(15/48 Pages) OSRAM

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AS7262 − Detailed Description

Data Conversion Description

AS7262 spectral conversion is implemented via two

photodiode banks per device. Bank 1 consists of data from the

V, G, B, Y photodiodes. Bank 2 consists of data from the G, Y, O,

R 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 BANK Mode

settings as follows:

BANK Mode 0: Data will be available in registers V, B, G & Y (O

and R registers will be zero) with conversions occurring

continuously.

BANK Mode 1: Data will be available in registers G, Y, O & R (V

and B registers will be zero) with conversions occurring

continuously.

BANK Mode 2: Data will be available in registers V, B, G, Y, O &

R with conversions occurring continuously.

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 V, B, G, Y, O &

R in One-Shot mode.

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. An

example use for one-shot mode is when a digitally controlled

illumination source is briefly turned on for the purpose of taking

a set of filter readings.

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