AS7331 datasheet(61/72 Pages) OSRAM

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AS7331

Datasheet

• PUBLIC

DS001047

• v4-00 • 2023-Mar-24

│ 60

Addr: 0h

STATUS

Bit

Bit Name

Default

Access

Bit Description

Measurement is in

progress.

STANDBYSTATE

Value

Standby

OFF

POWERSTATE

Value

Power Down state

OFF

(1)

Overflow of the internal 24-bit conversion time counter

– only possible in SYND mode with externally synchronized start

and stop of conversion.

(2)

The status flag is generated while a measurement is in progress. It always matches to the actual results of the output

(3)

A reading process of the register STATUS always resets this status flag.

(4)

A reading process of the register STATUS and/or at least one result register always resets this status flag.

The bit STATUS:OUTCONVOF, shows an overflow of the 24-bit counter of the internal reference for

the conversion time. This can only occur i

n SYND mode with CREG2:EN_TM = “1” and in case of

accordingly long externally given conversion times. After a counter overflow, the counter starts again

from zero.

The bit STATUS:MRESOF,

shows an overflow in one or more result registers of MRES1 … MRES3.

This can only happen if the conversion time is longer than 216

(CREG1:TIME = 7…15 dec), in

accordance with a higher input signal. The overflowed register stops at its maximum value, FFFFh.

With the bit STATUS:ADCOF, an input signal overdrive is signalized, which could occur during the

measurement cycle limited in time so that no overflow of the result registers (MRESOF) is necessarily

produced. However, the measurement results are not correct in this case. To eliminate this issue, the

irradiance responsivity (Re) of the sensor has to be decreased via CREG1:GAIN.

The status bits OUTCONVOF, MRESOF, and ADCOF, always correspond to the actual content of the

measurement result registers MRES1…3.

The bits STATUS:LDATA and STATUS:NDATA, show the status of the measurement results. At the

end of each measurement cycle, the results of the counters are stored in buffer registers. The flag

NDATA is set to “1” to show the update (see Figure 56). With the start of each I²C read operation, the

content of all buffer registers is transferred to the result registers. This ensures that during the I²C

readout operation, the values of the result registers do not change.

As long as an I²C-reading of the measurement result registers is in the process (no I²C stop condition

has been sent), no further update of the measurement result registers concerning newer data of the

buffer registers will happen.

AS7331 数据表(PDF) 61 Page - OSRAM GmbH

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