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AS7331

Functional Description

Datasheet

• PUBLIC

DS001047

• v4-00 • 2023-Mar-24

│ 19

Information

Please note that the break time should be long enough to prevent overlapping of data fetch

activities with the measurement for avoiding measurement disturbances, which could cause

distortions of the measurement results.

Figure 13:

Principle Sequence for a Measurement Start in CONT Mode

7.2.2

Command Measurement Mode

– CMD

The CMD mode enables a start of a single conversion. Each conversion starts by setting the bit

OSR:SS to “1”. The conversion time (TCONV) is determined by the content of the register CREG1:TIME

(see Figure 48). Figure 14 shows the first measurement starting from the Configuration state by

setting the bits of the Device Operational State (OSR:DOS) and Start/Stop (OSR:SS) at the same time

with OSR = 83h. To start the next measurement, OSR = 80h is set (only bit OSR:SS,

OSR:DOS = 000b corresponds to NOP

– no operation, see also Figure 45.

The rising edge of READY signalizes the end of conversion and its valid output data can be read via

the I²C interface (data fetch).

IDLE

PAUSE

MRES1 …

MRES3

READY

STATE

I²C activity

MEASUREMENT 1

data

fetch

start (OSR:SS ← ,1')

IDLE

RESULTS 1

RESULTS 2

data

fetch

stop (OSR:SS ← ,0')

MEASUREMENT 2

TCONV

TBREAK

TBREAK aborted

PAUSE

AS7331 数据表(PDF) 20 Page - OSRAM GmbH

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