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AS7331

Functional Description

Datasheet

• PUBLIC

DS001047

• v4-00 • 2023-Mar-24

│ 30

Figure 26:

Principle Sequence of Measurement in SYND Mode Ready for Wake-Up After Switch Off Power

Down State

7.4

Transfer Function

In general, the implemented A/D converter represents a delta-sigma converter, which performs charge

balancing between the input light at the photodiodes and an internal reference. The input currents of

the photodiodes result in pulse density modulated digital signals, further filtered by counters up to

24- bits. The counters will be set by definition of TINT. A 64 ms conversion time is required as minimum

for a 16-bit I²C output (Figure 27). In

the end, each channel’s counter status represents a digital

equivalent of the average input light irradiance regarding the channel’s sensor area within the

conversion time interval. The input light irradiance can be calculated from the measurement result by:

Equation 2:

MRES

FSR

MRES

CLK





Equation 3:

MRES

FSR

CLK

CONV





STANDBY

PAUSE

MEASUREMENT 2

STATE

READY

TCONV

MEASUREMENT 1

TSTARTSB

TBREAK

MRES1 …

MRES3

RESULTS 1

I²C activity

data

fetch

RESULT 1

OSR

83h

start

SYN

TSTARTSB

CONFIGURATION

STANDBY

OUTCONV

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