Data Sheet

Page 14 ams Datasheet
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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 2
nd
bank requires an
additional IT ms. Minimum IT for a single bank conversion is
2 .8 m s. I f d at a i s re q ui re d fro m 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.